From 097dd72124d56788c204197c90dba118bd284bbe Mon Sep 17 00:00:00 2001 From: Lokathor Date: Sat, 10 Nov 2018 02:03:37 -0700 Subject: [PATCH] almost chapter 1 --- Cargo.toml | 2 +- book/src/SUMMARY.md | 8 +- book/src/ch0/index.md | 122 +++++++ book/src/ch01.md | 1 - book/src/ch1/hello1.md | 179 +++++++++++ book/src/ch1/index.md | 10 + book/src/ch1/io_registers.md | 33 ++ book/src/ch1/the_display_control.md | 99 ++++++ book/src/ch1/video_memory_intro.md | 37 +++ book/src/introduction.md | 15 + build.bat | 38 +-- docs/ch0/index.html | 329 +++++++++++++++++++ docs/ch1/hello1.html | 356 +++++++++++++++++++++ docs/ch1/index.html | 207 ++++++++++++ docs/ch1/io_registers.html | 233 ++++++++++++++ docs/ch1/the_display_control.html | 276 ++++++++++++++++ docs/ch1/video_memory_intro.html | 215 +++++++++++++ docs/index.html | 17 +- docs/{ch01.html => introduction.html} | 25 +- docs/print.html | 445 +++++++++++++++++++++++++- docs/searchindex.js | 2 +- docs/searchindex.json | 2 +- examples/hello1.rs | 19 ++ linker.ld | 63 ++++ src/io_registers.rs | 158 +-------- src/video_ram.rs | 32 +- 26 files changed, 2734 insertions(+), 189 deletions(-) create mode 100644 book/src/ch0/index.md delete mode 100644 book/src/ch01.md create mode 100644 book/src/ch1/hello1.md create mode 100644 book/src/ch1/index.md create mode 100644 book/src/ch1/io_registers.md create mode 100644 book/src/ch1/the_display_control.md create mode 100644 book/src/ch1/video_memory_intro.md create mode 100644 book/src/introduction.md create mode 100644 docs/ch0/index.html create mode 100644 docs/ch1/hello1.html create mode 100644 docs/ch1/index.html create mode 100644 docs/ch1/io_registers.html create mode 100644 docs/ch1/the_display_control.html create mode 100644 docs/ch1/video_memory_intro.html rename docs/{ch01.html => introduction.html} (78%) create mode 100644 examples/hello1.rs create mode 100644 linker.ld diff --git a/Cargo.toml b/Cargo.toml index 283fc65..d8e7aee 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -6,7 +6,7 @@ edition = "2018" license = "Apache-2.0" [dependencies] -#gba-proc-macro = "0.1" +gba-proc-macro = "0.1.1" [profile.release] lto = true diff --git a/book/src/SUMMARY.md b/book/src/SUMMARY.md index e03a4d0..835ff6e 100644 --- a/book/src/SUMMARY.md +++ b/book/src/SUMMARY.md @@ -1,4 +1,10 @@ # Rust GBA Tutorials -* [ch01](ch01.md) +* [Introduction](introduction.md) +* [Ch 0: Development Setup](ch0/index.md) +* [Ch 1: Hello GBA](ch1/index.md) + * [hello1](ch1/hello1.md) + * [IO Registers](ch1/io_registers.md) + * [The Display Control](ch1/the_display_control.md) + * [Video Memory Intro](ch1/video_memory_intro.md) diff --git a/book/src/ch0/index.md b/book/src/ch0/index.md new file mode 100644 index 0000000..8aac0ac --- /dev/null +++ b/book/src/ch0/index.md @@ -0,0 +1,122 @@ +# Chapter 0: Development Setup + +Before you can build a GBA game you'll have to follow some special steps to +setup the development environment. Perhaps unfortunately, there's enough detail +here to warrant a mini-chapter all on its own. + +## Per System Setup + +Obviously you need your computer to have a working rust installation. However, +you'll also need to ensure that you're using a nightly toolchain. You can run +`rustup default nightly` to set nightly as the system wide default toolchain, or +you can use a [toolchain +file](https://github.com/rust-lang-nursery/rustup.rs#the-toolchain-file) to use +nightly just on a specific project, but either way we'll be assuming nightly +from now on. + +Next you need [devkitpro](https://devkitpro.org/wiki/Getting_Started). They've +got a graphical installer for Windows, and `pacman` support on Linux. We'll be +using a few of their binutils for the `arm-none-eabi` target, and we'll also be +using some of their tools that are specific to GBA development, so _even if_ you +already have the right binutils for whatever reason, you'll still want devkitpro +for the `gbafix` utility. + +* On Windows you'll want something like `C:\devkitpro\devkitARM\bin` and + `C:\devkitpro\tools\bin` to be [added to your + PATH](https://stackoverflow.com/q/44272416/455232), depending on where you + installed it to and such. +* On Linux you'll also want it to be added to your path, but if you're using + Linux I'll just assume you know how to do all that. + +Finally, you'll need `cargo-xbuild`. Just run `cargo install cargo-xbuild` and +cargo will figure it all out for you. + +## Per Project Setup + +Now you'll need some particular files each time you want to start a new project. +You can find them in the root of the [rust-console/gba +repo](https://github.com/rust-console/gba). + +* `thumbv4-none-eabi.json` describes the overall GBA to cargo-xbuild so it knows + what to do. +* `crt0.s` describes some ASM startup stuff. If you have more ASM to place here + later on this is where you can put it. You also need to build it into a + `crt0.o` file before it can actually be used, but we'll cover that below. +* `linker.ld` tells the linker more critical info about the layout expectations + that the GBA has about our program. + +## Compiling + +Once you've got something to build, you perform the following steps: + +* `arm-none-eabi-as crt0.s -o crt0.o` + * This builds your text format `crt0.s` file into object format `crt0.o`. You + don't need to perform it every time, only when `crt0.s` changes, but you + might as well do it every time so that you never forget to because it's a + practically instant operation. + +* `cargo xbuild --target thumbv4-none-eabi.json` + * This builds your Rust source. It accepts _most of_ the normal options, such + as `--release`, and options, such as `--bin foo` or `--examples`, that you'd + expect `cargo` to accept. + * You **can not** build and run tests this way, because they require `std`, + which the GBA doesn't have. You can still run some of your project's tests + with `cargo test`, but that builds for your local machine, so anything + specific to the GBA (such as reading and writing registers) won't be + testable that way. If you want to isolate and try out some piece code + running on the GBA you'll unfortunately have to make a demo for it in your + `examples/` directory and then run the demo in an emulator and see if it + does what you expect. + * The file extension is important. `cargo xbuild` takes it as a flag to + compile dependencies with the same sysroot, so you can include crates + normally. Well, creates that work in the GBA's limited environment, but you + get the idea. + +At this point you have an ELF binary that some emulators can execute directly. +This is helpful because it'll have debug symbols and all that, assuming a debug +build. Specifically, [mgba 0.1 beta +1](https://mgba.io/2018/09/24/mgba-0.7-beta1/) can do it, and perhaps other +emulators can also do it. + +However, if you want a "real" ROM that works in all emulators and that you could +transfer to a flash cart there's a little more to do. + +* `arm-none-eabi-objcopy -O binary target/thumbv4-none-eabi/MODE/BIN_NAME target/ROM_NAME.gba` + * This will perform an [objcopy](https://linux.die.net/man/1/objcopy) on our + program. Here I've named the program `arm-none-eabi-objcopy`, which is what + devkitpro calls their version of `objcopy` that's specific to the GBA in the + Windows install. If the program isn't found under that name, have a look in + your installation directory to see if it's under a slightly different name + or something. + * As you can see from reading the man page, the `-O binary` option takes our + lovely ELF file with symbols and all that and strips it down to basically a + bare memory dump of the program. + * The next argument is the input file. You might not be familiar with how + `cargo` arranges stuff in the `target/` directory, and between RLS and + `cargo doc` and stuff it gets kinda crowded, so it goes like this: + * Since our program was built for a non-local target, first we've got a + directory named for that target, `thumbv4-none-eabi/` + * Next, the "MODE" is either `debug/` or `release/`, depending on if we had + the `--release` flag included. You'll probably only be packing release + mode programs all the way into GBA roms, but it works with either mode. + * Finally, the name of the program. If your program is something out of the + project's `src/bin/` then it'll be that file's name, or whatever name you + configured for the bin in the `Cargo.toml` file. If your program is + something out of the project's `examples/` directory there will be a + similar `examples/` sub-directory first, and then the example's name. + * The final argument is the output of the `objcopy`, which I suggest putting + at just the top level of the `target/` directory. Really it could go + anywhere, but if you're using git then it's likely that your `.gitignore` + file is already setup to exclude everything in `target/`, so this makes sure + that your intermediate game builds don't get checked into your git. + +* `gbafix target/ROM_NAME.gba` + * The `gbafix` tool also comes from devkitpro. The GBA is very picky about a + ROM's format, and `gbafix` patches the ROM's header and such so that it'll + work right. Unlike `objcopy`, this tool is custom built for GBA development, + so it works just perfectly without any arguments beyond the file name. The + ROM is patched in place, so we don't even need to specify a new destination. + +And you're finally done! + +Of course, you probably want to make a script for all that, but it's up to you. diff --git a/book/src/ch01.md b/book/src/ch01.md deleted file mode 100644 index 730a444..0000000 --- a/book/src/ch01.md +++ /dev/null @@ -1 +0,0 @@ -# ch01 diff --git a/book/src/ch1/hello1.md b/book/src/ch1/hello1.md new file mode 100644 index 0000000..042cdf5 --- /dev/null +++ b/book/src/ch1/hello1.md @@ -0,0 +1,179 @@ +# hello1 + +Ready? Here goes: + +`hello1.rs` + +```rust +#![feature(start)] +#![no_std] + +#[cfg(not(test))] +#[panic_handler] +fn panic(_info: &core::panic::PanicInfo) -> ! { + loop {} +} + +#[start] +fn main(_argc: isize, _argv: *const *const u8) -> isize { + unsafe { + (0x04000000 as *mut u16).write_volatile(0x0403); + (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F); + (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0); + (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00); + loop {} + } +} +``` + +Throw that into your project, build the program (as described back in Chapter +0), and give it a run. You should see a red, green, and blue dot close-ish to +the middle of the screen. If you don't, something already went wrong. Double +check things, phone a friend, write your senators, try asking Ketsuban on the +[Rust Community Discord](https://discordapp.com/invite/aVESxV8), until you're +able to get your three dots going. + +## Explaining hello1 + +So, what just happened? Even if you're used to Rust that might look pretty +strange. We'll go over each part extra carefully. + +```rust +#![feature(start)] +``` + +This enables the [start +feature](https://doc.rust-lang.org/beta/unstable-book/language-features/start.html), +which you would normally be able to read about in the unstable book, except that +the book tells you nothing at all except to look at the [tracking +issue](https://github.com/rust-lang/rust/issues/29633). + +Basically, a GBA game is even more low-level than the _normal_ amount of +low-level that you get from Rust, so we have to tell the compiler to account for +that by specifying a `#[start]`, and we need this feature on to do that. + +```rust +#![no_std] +``` + +There's no standard library available on the GBA, so we'll have to live a core +only life. + +```rust +#[cfg(not(test))] +#[panic_handler] +fn panic(_info: &core::panic::PanicInfo) -> ! { + loop {} +} +``` + +This sets our [panic +handler](https://doc.rust-lang.org/nightly/nomicon/panic-handler.html). +Basically, if we somehow trigger a panic, this is where the program goes. +However, right now we don't know how to get any sort of message out to the user +so... we do nothing at all. We _can't even return_ from here, so we just sit in +an infinite loop. The player will have to reset the universe from the outside. + +The `#[cfg(not(test))]` part makes this item only exist in the program when +we're _not_ in a test build. This is so that `cargo test` and such work right as +much as possible. + +```rust +#[start] +fn main(_argc: isize, _argv: *const *const u8) -> isize { +``` + +This is our `#[start]`. We call it `main`, but the signature looks a lot more +like the main from C than it does the main from Rust. Actually, those inputs are +useless, because nothing will be calling our code from the outside. Similarly, +it's totally undefined to return anything, so the fact that we output an `isize` +is vacuously true at best. We just have to use this function signature because +that's how `#[start]` works, not because the inputs and outputs are meaningful. + +```rust + unsafe { +``` + +I hope you're all set for some `unsafe`, because there's a lot of it to be had. + +```rust + (0x04000000 as *mut u16).write_volatile(0x0403); +``` + +Sure! + +```rust + (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F); + (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0); + (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00); +``` + +Ah, of course. + +```rust + loop {} + } +} +``` + +And, as mentioned above, there's no place for a GBA program to "return to", so +we can't ever let `main` try to return there. Instead, we go into an infinite +`loop` that does nothing. The fact that this doesn't ever return an `isize` +value doesn't seem to bother Rust, because I guess we're at least not returning +any other type of thing instead. + +Fun fact: unlike in C++, an infinite loop with no side effects isn't Undefined +Behavior for us rustaceans... _semantically_. In truth LLVM has a [known +bug](https://github.com/rust-lang/rust/issues/28728) in this area, so we won't +actually be relying on empty loops in any future programs. + +## All Those Magic Numbers + +Alright, I cheated quite a bit in the middle there. The program works, but I +didn't really tell you why because I didn't really tell you what any of those +magic numbers mean or do. + +* `0x04000000` is the address of an IO Register called the Display Control. +* `0x06000000` is the start of Video RAM. + +So we write some magic to the display control register once, then we write some +other magic to three locations of magic to the Video RAM. We get three dots, +each in their own location... so that second part makes sense at least. + +We'll get into the magic number details in the other sections of this chapter. + +## Sidebar: Volatile + +We'll get into what all that is in a moment, but first let's ask ourselves: Why +are we doing _volatile_ writes? You've probably never used it before at all. +What is volatile anyway? + +Well, the optimizer is pretty aggressive some of the time, and so it'll skip +reads and writes when it thinks can. Like if you write to a pointer once, and +then again a moment later, and it didn't see any other reads in between, it'll +think that it can just skip doing that first write since it'll get overwritten +anyway. Sometimes that's right, but sometimes it's wrong. + +Marking a read or write as _volatile_ tells the compiler that it really must do +that action, and in the exact order that we wrote it out. It says that there +might even be special hardware side effects going on that the compiler isn't +aware of. In this case, the Display Control write sets a video mode, and the +Video RAM writes set pixels that will show up on the screen. + +Similar to "atomic" operations you might have heard about, all volatile +operations are enforced to happen in the exact order that you specify them, but +only relative to other volatile operations. So something like + +```rust +c.volatile_write(5); +a += b; +d.volatile_write(7); +``` + +might end up changing `a` either before or after the change to `c`, but the +write to `d` will _always_ happen after the write to `c`. + +If you ever use volatile stuff on other platforms it's important to note that +volatile doesn't make things thread-safe, you still need atomic for that. +However, the GBA doesn't have threads, so we don't have to worry about thread +safety concerns. diff --git a/book/src/ch1/index.md b/book/src/ch1/index.md new file mode 100644 index 0000000..7c21c79 --- /dev/null +++ b/book/src/ch1/index.md @@ -0,0 +1,10 @@ +# Ch 1: Hello GBA + +Traditionally a person writes a "hello, world" program so that they can test +that their development environment is setup properly and to just get a feel for +using the tools involved. To get an idea of what a small part of a source file +will look like. All that stuff. + +Normally, you write a program that prints "hello, world" to the terminal. The +GBA has no terminal, but it does have a screen, so instead we're going to draw +three dots to the screen. diff --git a/book/src/ch1/io_registers.md b/book/src/ch1/io_registers.md new file mode 100644 index 0000000..890e7a7 --- /dev/null +++ b/book/src/ch1/io_registers.md @@ -0,0 +1,33 @@ +# IO Registers + +The GBA has a large number of **IO Registers** (not to be confused with CPU +registers). These are special memory locations from `0x04000000` to +`0x040003FE`. GBATEK has a [full +list](http://problemkaputt.de/gbatek.htm#gbaiomap), but we only need to learn +about a few of them at a time as we go, so don't be worried. + +The important facts to know about IO Registers are these: + +* Each has their own specific size. Most are `u16`, but some are `u32`. +* All of them must be accessed in a `volatile` style. +* Each register is specifically readable or writable or both. Actually, with + some registers there are even individual bits that are read-only or + write-only. + * If you write to a read-only position, those writes are simply ignored. This + mostly matters if a writable register contains a read-only bit (such as the + Display Control, next section). + * If you read from a write-only position, you get back values that are + [basically + nonsense](http://problemkaputt.de/gbatek.htm#gbaunpredictablethings). There + aren't really any registers that mix writable bits with read only bits, so + you're basically safe here. The only (mild) concern is that when you write a + value into a write-only register you need to keep track of what you wrote + somewhere else if you want to know what you wrote (such to adjust an offset + value by +1, or whatever). + * You can always check GBATEK to be sure, but if I don't mention it then a bit + is probably both read and write. +* Some registers have invalid bit patterns. For example, the lowest three bits + of the Display Control register can't legally be set to the values 6 or 7. + +When talking about bit positions, the numbers are _zero indexed_ just like an +array index is. diff --git a/book/src/ch1/the_display_control.md b/book/src/ch1/the_display_control.md new file mode 100644 index 0000000..21c66d6 --- /dev/null +++ b/book/src/ch1/the_display_control.md @@ -0,0 +1,99 @@ +# The Display Control + +The Display Control is our first actual IO Register. GBATEK gives it the +shorthand [DISPCNT](http://problemkaputt.de/gbatek.htm#lcdiodisplaycontrol), so +you might see it under that name if you read other guides. + +Among IO Registers, it's one of the simpler ones, but it's got enough complexity +that we can get a hint of what's to come. + +Also it's the one that you basically always need to set at least once in every +GBA game, so it's a good starting one to go over for that reason too. + +The Display Control is a `u16` value located at `0x0400_0000`. + +## Video Modes + +The lowest three bits (0-2) let you select from among the GBA's six video modes. +You'll notice that 3 bits allows for eight modes, but the values 6 and 7 are +prohibited. + +Modes 0, 1, and 2 are "Tiled" modes. These are actually the modes that you +should eventually learn to use as much as possible. It lets the GBA's limited +video hardware do as much of the work as possible, leaving more of your CPU time +for gameplay computations. However, they're also complex enough to deserve their +own demos and chapters later on, so that's all we'll say about them for now. + +Modes 3, 4, and 5 are "Bitmap" modes. These let you write individual pixels to +locations on the screen. + +* **Mode 3** is full resolution (240w x 160h) RBG15 color. You might not be used to + RGB15, since modern computers have 24 or 32 bit colors. In RGB15, there's 5 + bits for each color channel, and the highest bit is totally ignored. +* **Mode 4** is full resolution paletted color. Instead of being a `u16` color, each + pixel value is a `u8` palette index entry, and then the display uses the + palette memory (which we'll talk about later) to store the actual color data. + Since each pixel is half sized, we can fit twice as many. This lets us have + two "pages". At any given moment only one page is active, and you can draw to + the other page without the user noticing. You set which page to show with + another bit we'll get to in a moment. +* **Mode 5** is full color, but also with pages. This means that we must have a + reduced resolution to compensate (video memory is only so big!). The screen is + effectively only 160w x 128h in this mode. + +## CGB Mode + +Bit 3 is read only. It's on if you're running in CGB mode. Since we're making +GBA games you'd think that it'll never be on at all, but I guess you can change +it with BIOS stuff. Still, basically not an important bit. + +## Page Flipping + +Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or +5, and is just ignored otherwise. It's very easy to remember: when the bit is 0 +the 0th page is used, and when the bit is 1 the 1st page is used. + +The second page always starts at `0x0600_A000`. + +## OAM, VRAM, and Blanking + +Bit 5 lets you access OAM during HBlank if enabled. This is cool, but it reduces +the maximum sprites per scanline, so it's not default. + +Bit 6 lets you adjust if the GBA should treat Object Character VRAM as being 2d +(off) or 1d (on). + +Bit 7 forces the screen to stay in vblank as long as it's set. This allows the +fastest use of the VRAM, Palette, and Object Attribute Memory. Obviously if you +leave this on for too long the player will notice a blank screen, but it might +be okay to use for a moment or two every once in a while. + +## Screen Layers + +Bits 8 through 11 control if Background layers 0 through 3 should be active. + +Bit 12 affects the Object layer. + +Note that not all background layers are available in all video modes: + +* Mode 0: all +* Mode 1: 0/1/2 +* Mode 2: 2/3 +* Mode 3/4/5: 2 + +Bit 13 and 14 enable the display of Windows 0 and 1, and Bit 15 enables the +object display window. We'll get into how windows work later on, they let you do +some nifty graphical effects. + +## In Conclusion... + +So what did we do to the display control in `hello1`? + +```rust + (0x04000000 as *mut u16).write_volatile(0x0403); +``` + +First let's [convert that to +binary](https://www.wolframalpha.com/input/?i=0x0403), and we get +`0b100_0000_0011`. So, that's setting Mode 3 with background 2 enabled and +nothing else special. diff --git a/book/src/ch1/video_memory_intro.md b/book/src/ch1/video_memory_intro.md new file mode 100644 index 0000000..29569ea --- /dev/null +++ b/book/src/ch1/video_memory_intro.md @@ -0,0 +1,37 @@ +# Video Memory Intro + +The GBA's Video RAM is 96k stretching from `0x0600_0000` to `0x0601_7FFF`. + +The Video RAM can only be accessed totally freely during a Vertical Blank +(aka "vblank"). At other times, if the CPU tries to touch the same part of video +memory as the display controller is accessing then the CPU gets bumped by a +cycle to avoid a clash. + +Annoyingly, VRAM can only be properly written to in 16 and 32 bit segments (same +with PALRAM and OAM). If you try to write just an 8 bit segment, then both parts +of the 16 bit segment get the same value written to them. In other words, if you +write the byte `5` to `0x0600_0000`, then both `0x0600_0000` and ALSO +`0x0600_0001` will have the byte `5` in them. We have to be extra careful when +trying to set an individual byte, and we also have to be careful if we use +`memcopy` or `memset` as well, because they're byte oriented by default and +don't know to follow the special rules. + +## RGB15 + +TODO + +## Mode 3 + +TODO + +## Mode 4 + +TODO + +## Mode 5 + +TODO + +## In Conclusion... + +TODO diff --git a/book/src/introduction.md b/book/src/introduction.md new file mode 100644 index 0000000..91a59b9 --- /dev/null +++ b/book/src/introduction.md @@ -0,0 +1,15 @@ +# Introduction + +Here's a book that'll help you program in Rust on the GBA. + +It's very "work in progress". At the moment there's only one demo program. + +## Other Works + +If you want to read more about developing on the GBA there are some other good resources as well: + +* [Tonc](https://www.coranac.com/tonc/text/toc.htm), a tutorial series written + for C, but it's what I based the ordering of this book's sections on. +* [GBATEK](http://problemkaputt.de/gbatek.htm), a homebrew tech manual for + GBA/NDS/DSi. We will regularly link to parts of it when talking about various + bits of the GBA. diff --git a/build.bat b/build.bat index 554a6e1..5dfac51 100644 --- a/build.bat +++ b/build.bat @@ -1,32 +1,14 @@ -@echo off -REM It could work to only rebuild the `crt0.o` file when `crt0.s` actually -REM changes, but it's actually a super cheap operation so we'll just do it -REM every single time to avoid any mix ups. -@echo on +@rem Build the crt0 file before we begin arm-none-eabi-as crt0.s -o crt0.o -@echo off -REM This builds our program for the GBA. Note that the extension here is -REM important, because it causes all crates that we might import to also -REM use the correct target. -@echo on +@rem Build all examples, both debug and release +cargo xbuild --examples --target thumbv4-none-eabi.json +cargo xbuild --examples --target thumbv4-none-eabi.json --release -cargo xbuild --target thumbv4-none-eabi.json - -@echo off -REM Some emulators can use cargo's output directly (which is cool, because then -REM you can keep debug symbols and stuff), but to make a "real" ROM we have to -REM also use the devkitpro tools to patch up the file a bit. -@echo on - -arm-none-eabi-objcopy -O binary target/thumbv4-none-eabi/debug/main target/output.gba -gbafix target/output.gba - -@echo off -REM Now all the same for release mode too! -@echo on - -cargo xbuild --target thumbv4-none-eabi.json --release -arm-none-eabi-objcopy -O binary target/thumbv4-none-eabi/release/main target/output-release.gba -gbafix target/output-release.gba +@echo Packing examples into ROM files... +@for %%I in (.\examples\*.*) do @( + echo %%~nI + arm-none-eabi-objcopy -O binary target/thumbv4-none-eabi/release/examples/%%~nI target/example-%%~nI.gba >nul + gbafix target/example-%%~nI.gba >nul +) diff --git a/docs/ch0/index.html b/docs/ch0/index.html new file mode 100644 index 0000000..434256a --- /dev/null +++ b/docs/ch0/index.html @@ -0,0 +1,329 @@ + + + + + + Ch 0: Development Setup - Rust GBA Tutorials + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
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+

Chapter 0: Development Setup

 +

Before you can build a GBA game you'll have to follow some special steps to +setup the development environment. Perhaps unfortunately, there's enough detail +here to warrant a mini-chapter all on its own.

+

Per System Setup

 +

Obviously you need your computer to have a working rust installation. However, +you'll also need to ensure that you're using a nightly toolchain. You can run +rustup default nightly to set nightly as the system wide default toolchain, or +you can use a toolchain +file to use +nightly just on a specific project, but either way we'll be assuming nightly +from now on.

+

Next you need devkitpro. They've +got a graphical installer for Windows, and pacman support on Linux. We'll be +using a few of their binutils for the arm-none-eabi target, and we'll also be +using some of their tools that are specific to GBA development, so even if you +already have the right binutils for whatever reason, you'll still want devkitpro +for the gbafix utility.

+
    +
  • On Windows you'll want something like C:\devkitpro\devkitARM\bin and +C:\devkitpro\tools\bin to be added to your +PATH, depending on where you +installed it to and such.
    • +
  • On Linux you'll also want it to be added to your path, but if you're using +Linux I'll just assume you know how to do all that.
    • +
+

Finally, you'll need cargo-xbuild. Just run cargo install cargo-xbuild and +cargo will figure it all out for you.

+

Per Project Setup

 +

Now you'll need some particular files each time you want to start a new project. +You can find them in the root of the rust-console/gba +repo.

+
    +
  • thumbv4-none-eabi.json describes the overall GBA to cargo-xbuild so it knows +what to do.
    • +
  • crt0.s describes some ASM startup stuff. If you have more ASM to place here +later on this is where you can put it. You also need to build it into a +crt0.o file before it can actually be used, but we'll cover that below.
    • +
  • linker.ld tells the linker more critical info about the layout expectations +that the GBA has about our program.
    • +
+

Compiling

 +

Once you've got something to build, you perform the following steps:

+
    +
  • +

    arm-none-eabi-as crt0.s -o crt0.o

    +
      +
    • This builds your text format crt0.s file into object format crt0.o. You +don't need to perform it every time, only when crt0.s changes, but you +might as well do it every time so that you never forget to because it's a +practically instant operation.
      • +
    +
    • +
  • +

    cargo xbuild --target thumbv4-none-eabi.json

    +
      +
    • This builds your Rust source. It accepts most of the normal options, such +as --release, and options, such as --bin foo or --examples, that you'd +expect cargo to accept.
      • +
    • You can not build and run tests this way, because they require std, +which the GBA doesn't have. You can still run some of your project's tests +with cargo test, but that builds for your local machine, so anything +specific to the GBA (such as reading and writing registers) won't be +testable that way. If you want to isolate and try out some piece code +running on the GBA you'll unfortunately have to make a demo for it in your +examples/ directory and then run the demo in an emulator and see if it +does what you expect.
      • +
    • The file extension is important. cargo xbuild takes it as a flag to +compile dependencies with the same sysroot, so you can include crates +normally. Well, creates that work in the GBA's limited environment, but you +get the idea.
      • +
    +
    • +
+

At this point you have an ELF binary that some emulators can execute directly. +This is helpful because it'll have debug symbols and all that, assuming a debug +build. Specifically, mgba 0.1 beta +1 can do it, and perhaps other +emulators can also do it.

+

However, if you want a "real" ROM that works in all emulators and that you could +transfer to a flash cart there's a little more to do.

+
    +
  • +

    arm-none-eabi-objcopy -O binary target/thumbv4-none-eabi/MODE/BIN_NAME target/ROM_NAME.gba

    +
      +
    • This will perform an objcopy on our +program. Here I've named the program arm-none-eabi-objcopy, which is what +devkitpro calls their version of objcopy that's specific to the GBA in the +Windows install. If the program isn't found under that name, have a look in +your installation directory to see if it's under a slightly different name +or something.
      • +
    • As you can see from reading the man page, the -O binary option takes our +lovely ELF file with symbols and all that and strips it down to basically a +bare memory dump of the program.
      • +
    • The next argument is the input file. You might not be familiar with how +cargo arranges stuff in the target/ directory, and between RLS and +cargo doc and stuff it gets kinda crowded, so it goes like this: +
        +
      • Since our program was built for a non-local target, first we've got a +directory named for that target, thumbv4-none-eabi/
        • +
      • Next, the "MODE" is either debug/ or release/, depending on if we had +the --release flag included. You'll probably only be packing release +mode programs all the way into GBA roms, but it works with either mode.
        • +
      • Finally, the name of the program. If your program is something out of the +project's src/bin/ then it'll be that file's name, or whatever name you +configured for the bin in the Cargo.toml file. If your program is +something out of the project's examples/ directory there will be a +similar examples/ sub-directory first, and then the example's name.
        • +
      +
      • +
    • The final argument is the output of the objcopy, which I suggest putting +at just the top level of the target/ directory. Really it could go +anywhere, but if you're using git then it's likely that your .gitignore +file is already setup to exclude everything in target/, so this makes sure +that your intermediate game builds don't get checked into your git.
      • +
    +
    • +
  • +

    gbafix target/ROM_NAME.gba

    +
      +
    • The gbafix tool also comes from devkitpro. The GBA is very picky about a +ROM's format, and gbafix patches the ROM's header and such so that it'll +work right. Unlike objcopy, this tool is custom built for GBA development, +so it works just perfectly without any arguments beyond the file name. The +ROM is patched in place, so we don't even need to specify a new destination.
      • +
    +
    • +
+

And you're finally done!

+

Of course, you probably want to make a script for all that, but it's up to you.

+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + diff --git a/docs/ch1/hello1.html b/docs/ch1/hello1.html new file mode 100644 index 0000000..7c489b4 --- /dev/null +++ b/docs/ch1/hello1.html @@ -0,0 +1,356 @@ + + + + + + hello1 - Rust GBA Tutorials + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+ + + + + + + + + + +
+
+

hello1

 +

Ready? Here goes:

+

hello1.rs

+
#![feature(start)]
+#![no_std]
+
+#[cfg(not(test))]
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+  loop {}
+}
+
+#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+  unsafe {
+    (0x04000000 as *mut u16).write_volatile(0x0403);
+    (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F);
+    (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0);
+    (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00);
+    loop {}
+  }
+}
+
+

Throw that into your project, build the program (as described back in Chapter +0), and give it a run. You should see a red, green, and blue dot close-ish to +the middle of the screen. If you don't, something already went wrong. Double +check things, phone a friend, write your senators, try asking Ketsuban on the +Rust Community Discord, until you're +able to get your three dots going.

+

Explaining hello1

 +

So, what just happened? Even if you're used to Rust that might look pretty +strange. We'll go over each part extra carefully.

+

+# #![allow(unused_variables)]
+#![feature(start)]
+#fn main() {
+#}
+

This enables the start +feature, +which you would normally be able to read about in the unstable book, except that +the book tells you nothing at all except to look at the tracking +issue.

+

Basically, a GBA game is even more low-level than the normal amount of +low-level that you get from Rust, so we have to tell the compiler to account for +that by specifying a #[start], and we need this feature on to do that.

+

+# #![allow(unused_variables)]
+#![no_std]
+#fn main() {
+#}
+

There's no standard library available on the GBA, so we'll have to live a core +only life.

+

+# #![allow(unused_variables)]
+#fn main() {
+#[cfg(not(test))]
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+  loop {}
+}
+#}
+

This sets our panic +handler. +Basically, if we somehow trigger a panic, this is where the program goes. +However, right now we don't know how to get any sort of message out to the user +so... we do nothing at all. We can't even return from here, so we just sit in +an infinite loop. The player will have to reset the universe from the outside.

+

The #[cfg(not(test))] part makes this item only exist in the program when +we're not in a test build. This is so that cargo test and such work right as +much as possible.

+
#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+
+

This is our #[start]. We call it main, but the signature looks a lot more +like the main from C than it does the main from Rust. Actually, those inputs are +useless, because nothing will be calling our code from the outside. Similarly, +it's totally undefined to return anything, so the fact that we output an isize +is vacuously true at best. We just have to use this function signature because +that's how #[start] works, not because the inputs and outputs are meaningful.

+

+# #![allow(unused_variables)]
+#fn main() {
+  unsafe {
+#}
+

I hope you're all set for some unsafe, because there's a lot of it to be had.

+

+# #![allow(unused_variables)]
+#fn main() {
+    (0x04000000 as *mut u16).write_volatile(0x0403);
+#}
+

Sure!

+

+# #![allow(unused_variables)]
+#fn main() {
+    (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F);
+    (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0);
+    (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00);
+#}
+

Ah, of course.

+

+# #![allow(unused_variables)]
+#fn main() {
+    loop {}
+  }
+}
+#}
+

And, as mentioned above, there's no place for a GBA program to "return to", so +we can't ever let main try to return there. Instead, we go into an infinite +loop that does nothing. The fact that this doesn't ever return an isize +value doesn't seem to bother Rust, because I guess we're at least not returning +any other type of thing instead.

+

Fun fact: unlike in C++, an infinite loop with no side effects isn't Undefined +Behavior for us rustaceans... semantically. In truth LLVM has a known +bug in this area, so we won't +actually be relying on empty loops in any future programs.

+

All Those Magic Numbers

 +

Alright, I cheated quite a bit in the middle there. The program works, but I +didn't really tell you why because I didn't really tell you what any of those +magic numbers mean or do.

+
    +
  • 0x04000000 is the address of an IO Register called the Display Control.
    • +
  • 0x06000000 is the start of Video RAM.
    • +
+

So we write some magic to the display control register once, then we write some +other magic to three locations of magic to the Video RAM. We get three dots, +each in their own location... so that second part makes sense at least.

+

We'll get into the magic number details in the other sections of this chapter.

+

Sidebar: Volatile

 +

We'll get into what all that is in a moment, but first let's ask ourselves: Why +are we doing volatile writes? You've probably never used it before at all. +What is volatile anyway?

+

Well, the optimizer is pretty aggressive some of the time, and so it'll skip +reads and writes when it thinks can. Like if you write to a pointer once, and +then again a moment later, and it didn't see any other reads in between, it'll +think that it can just skip doing that first write since it'll get overwritten +anyway. Sometimes that's right, but sometimes it's wrong.

+

Marking a read or write as volatile tells the compiler that it really must do +that action, and in the exact order that we wrote it out. It says that there +might even be special hardware side effects going on that the compiler isn't +aware of. In this case, the Display Control write sets a video mode, and the +Video RAM writes set pixels that will show up on the screen.

+

Similar to "atomic" operations you might have heard about, all volatile +operations are enforced to happen in the exact order that you specify them, but +only relative to other volatile operations. So something like

+

+# #![allow(unused_variables)]
+#fn main() {
+c.volatile_write(5);
+a += b;
+d.volatile_write(7);
+#}
+

might end up changing a either before or after the change to c, but the +write to d will always happen after the write to c.

+

If you ever use volatile stuff on other platforms it's important to note that +volatile doesn't make things thread-safe, you still need atomic for that. +However, the GBA doesn't have threads, so we don't have to worry about thread +safety concerns.

+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + diff --git a/docs/ch1/index.html b/docs/ch1/index.html new file mode 100644 index 0000000..000b631 --- /dev/null +++ b/docs/ch1/index.html @@ -0,0 +1,207 @@ + + + + + + Ch 1: Hello GBA - Rust GBA Tutorials + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+ + + + + + + + + + +
+
+

Ch 1: Hello GBA

 +

Traditionally a person writes a "hello, world" program so that they can test +that their development environment is setup properly and to just get a feel for +using the tools involved. To get an idea of what a small part of a source file +will look like. All that stuff.

+

Normally, you write a program that prints "hello, world" to the terminal. The +GBA has no terminal, but it does have a screen, so instead we're going to draw +three dots to the screen.

+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + diff --git a/docs/ch1/io_registers.html b/docs/ch1/io_registers.html new file mode 100644 index 0000000..1e02d4c --- /dev/null +++ b/docs/ch1/io_registers.html @@ -0,0 +1,233 @@ + + + + + + IO Registers - Rust GBA Tutorials + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+ + + + + + + + + + +
+
+

IO Registers

 +

The GBA has a large number of IO Registers (not to be confused with CPU +registers). These are special memory locations from 0x04000000 to +0x040003FE. GBATEK has a full +list, but we only need to learn +about a few of them at a time as we go, so don't be worried.

+

The important facts to know about IO Registers are these:

+
    +
  • Each has their own specific size. Most are u16, but some are u32.
    • +
  • All of them must be accessed in a volatile style.
    • +
  • Each register is specifically readable or writable or both. Actually, with +some registers there are even individual bits that are read-only or +write-only. +
      +
    • If you write to a read-only position, those writes are simply ignored. This +mostly matters if a writable register contains a read-only bit (such as the +Display Control, next section).
      • +
    • If you read from a write-only position, you get back values that are +basically +nonsense. There +aren't really any registers that mix writable bits with read only bits, so +you're basically safe here. The only (mild) concern is that when you write a +value into a write-only register you need to keep track of what you wrote +somewhere else if you want to know what you wrote (such to adjust an offset +value by +1, or whatever).
      • +
    • You can always check GBATEK to be sure, but if I don't mention it then a bit +is probably both read and write.
      • +
    +
    • +
  • Some registers have invalid bit patterns. For example, the lowest three bits +of the Display Control register can't legally be set to the values 6 or 7.
    • +
+

When talking about bit positions, the numbers are zero indexed just like an +array index is.

+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + diff --git a/docs/ch1/the_display_control.html b/docs/ch1/the_display_control.html new file mode 100644 index 0000000..d8de045 --- /dev/null +++ b/docs/ch1/the_display_control.html @@ -0,0 +1,276 @@ + + + + + + The Display Control - Rust GBA Tutorials + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+ + + + + + + + + + +
+
+

The Display Control

 +

The Display Control is our first actual IO Register. GBATEK gives it the +shorthand DISPCNT, so +you might see it under that name if you read other guides.

+

Among IO Registers, it's one of the simpler ones, but it's got enough complexity +that we can get a hint of what's to come.

+

Also it's the one that you basically always need to set at least once in every +GBA game, so it's a good starting one to go over for that reason too.

+

The Display Control is a u16 value located at 0x0400_0000.

+

Video Modes

 +

The lowest three bits (0-2) let you select from among the GBA's six video modes. +You'll notice that 3 bits allows for eight modes, but the values 6 and 7 are +prohibited.

+

Modes 0, 1, and 2 are "Tiled" modes. These are actually the modes that you +should eventually learn to use as much as possible. It lets the GBA's limited +video hardware do as much of the work as possible, leaving more of your CPU time +for gameplay computations. However, they're also complex enough to deserve their +own demos and chapters later on, so that's all we'll say about them for now.

+

Modes 3, 4, and 5 are "Bitmap" modes. These let you write individual pixels to +locations on the screen.

+
    +
  • Mode 3 is full resolution (240w x 160h) RBG15 color. You might not be used to +RGB15, since modern computers have 24 or 32 bit colors. In RGB15, there's 5 +bits for each color channel, and the highest bit is totally ignored.
    • +
  • Mode 4 is full resolution paletted color. Instead of being a u16 color, each +pixel value is a u8 palette index entry, and then the display uses the +palette memory (which we'll talk about later) to store the actual color data. +Since each pixel is half sized, we can fit twice as many. This lets us have +two "pages". At any given moment only one page is active, and you can draw to +the other page without the user noticing. You set which page to show with +another bit we'll get to in a moment.
    • +
  • Mode 5 is full color, but also with pages. This means that we must have a +reduced resolution to compensate (video memory is only so big!). The screen is +effectively only 160w x 128h in this mode.
    • +
+

CGB Mode

 +

Bit 3 is read only. It's on if you're running in CGB mode. Since we're making +GBA games you'd think that it'll never be on at all, but I guess you can change +it with BIOS stuff. Still, basically not an important bit.

+

Page Flipping

 +

Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or +5, and is just ignored otherwise. It's very easy to remember: when the bit is 0 +the 0th page is used, and when the bit is 1 the 1st page is used.

+

The second page always starts at 0x0600_A000.

+

OAM, VRAM, and Blanking

 +

Bit 5 lets you access OAM during HBlank if enabled. This is cool, but it reduces +the maximum sprites per scanline, so it's not default.

+

Bit 6 lets you adjust if the GBA should treat Object Character VRAM as being 2d +(off) or 1d (on).

+

Bit 7 forces the screen to stay in vblank as long as it's set. This allows the +fastest use of the VRAM, Palette, and Object Attribute Memory. Obviously if you +leave this on for too long the player will notice a blank screen, but it might +be okay to use for a moment or two every once in a while.

+

Screen Layers

 +

Bits 8 through 11 control if Background layers 0 through 3 should be active.

+

Bit 12 affects the Object layer.

+

Note that not all background layers are available in all video modes:

+
    +
  • Mode 0: all
    • +
  • Mode 1: 0/1/2
    • +
  • Mode 2: 2/3
    • +
  • Mode 3/4/5: 2
    • +
+

Bit 13 and 14 enable the display of Windows 0 and 1, and Bit 15 enables the +object display window. We'll get into how windows work later on, they let you do +some nifty graphical effects.

+

In Conclusion...

 +

So what did we do to the display control in hello1?

+

+# #![allow(unused_variables)]
+#fn main() {
+    (0x04000000 as *mut u16).write_volatile(0x0403);
+#}
+

First let's convert that to +binary, and we get +0b100_0000_0011. So, that's setting Mode 3 with background 2 enabled and +nothing else special.

+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + diff --git a/docs/ch1/video_memory_intro.html b/docs/ch1/video_memory_intro.html new file mode 100644 index 0000000..d078464 --- /dev/null +++ b/docs/ch1/video_memory_intro.html @@ -0,0 +1,215 @@ + + + + + + Video Memory Intro - Rust GBA Tutorials + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ +
+ + + + + + + + + + +
+
+

Video Memory Intro

 +

The GBA's Video RAM is 96k stretching from 0x0600_0000 to 0x0601_7FFF.

+

The Video RAM can only be accessed totally freely during a Vertical Blank +(aka "vblank"). At other times, if the CPU tries to touch the same part of video +memory as the display controller is accessing then the CPU gets bumped by a +cycle to avoid a clash.

+

Annoyingly, VRAM can only be properly written to in 16 and 32 bit segments (same +with PALRAM and OAM). If you try to write just an 8 bit segment, then both parts +of the 16 bit segment get the same value written to them. In other words, if you +write the byte 5 to 0x0600_0000, then both 0x0600_0000 and ALSO +0x0600_0001 will have the byte 5 in them. We have to be extra careful when +trying to set an individual byte, and we also have to be careful if we use +memcopy or memset as well, because they're byte oriented by default and +don't know to follow the special rules.

+

RGB15

 +

TODO

+

Mode 3

 +

TODO

+

Mode 4

 +

TODO

+

Mode 5

 +

TODO

+

In Conclusion...

 +

TODO

+ +
+ + +
+
+ + + +
+ + + + + + + + + + + + + + + + + + + + + + + + diff --git a/docs/index.html b/docs/index.html index adf7623..08ed7de 100644 --- a/docs/index.html +++ b/docs/index.html @@ -3,7 +3,7 @@ - ch01 - Rust GBA Tutorials + Introduction - Rust GBA Tutorials @@ -72,7 +72,7 @@
@@ -136,7 +136,18 @@
-

ch01

 +

Introduction

 +

Here's a book that'll help you program in Rust on the GBA.

+

It's very "work in progress". At the moment there's only one demo program.

+

Other Works

 +

If you want to read more about developing on the GBA there are some other good resources as well:

+
    +
  • Tonc, a tutorial series written +for C, but it's what I based the ordering of this book's sections on.
    • +
  • GBATEK, a homebrew tech manual for +GBA/NDS/DSi. We will regularly link to parts of it when talking about various +bits of the GBA.
    • +
diff --git a/docs/ch01.html b/docs/introduction.html similarity index 78% rename from docs/ch01.html rename to docs/introduction.html index f94bc03..80128cc 100644 --- a/docs/ch01.html +++ b/docs/introduction.html @@ -3,7 +3,7 @@ - ch01 - Rust GBA Tutorials + Introduction - Rust GBA Tutorials @@ -72,7 +72,7 @@
@@ -136,7 +136,18 @@
-

ch01

 +

Introduction

 +

Here's a book that'll help you program in Rust on the GBA.

+

It's very "work in progress". At the moment there's only one demo program.

+

Other Works

 +

If you want to read more about developing on the GBA there are some other good resources as well:

+
    +
  • Tonc, a tutorial series written +for C, but it's what I based the ordering of this book's sections on.
    • +
  • GBATEK, a homebrew tech manual for +GBA/NDS/DSi. We will regularly link to parts of it when talking about various +bits of the GBA.
    • +
@@ -145,6 +156,10 @@ + +
@@ -155,6 +170,10 @@ + +
diff --git a/docs/print.html b/docs/print.html index e4b60cd..e1479b0 100644 --- a/docs/print.html +++ b/docs/print.html @@ -72,7 +72,7 @@
@@ -136,7 +136,448 @@
-

ch01

 +

Introduction

 +

Here's a book that'll help you program in Rust on the GBA.

+

It's very "work in progress". At the moment there's only one demo program.

+

Other Works

 +

If you want to read more about developing on the GBA there are some other good resources as well:

+
    +
  • Tonc, a tutorial series written +for C, but it's what I based the ordering of this book's sections on.
    • +
  • GBATEK, a homebrew tech manual for +GBA/NDS/DSi. We will regularly link to parts of it when talking about various +bits of the GBA.
    • +
+

Chapter 0: Development Setup

 +

Before you can build a GBA game you'll have to follow some special steps to +setup the development environment. Perhaps unfortunately, there's enough detail +here to warrant a mini-chapter all on its own.

+

Per System Setup

 +

Obviously you need your computer to have a working rust installation. However, +you'll also need to ensure that you're using a nightly toolchain. You can run +rustup default nightly to set nightly as the system wide default toolchain, or +you can use a toolchain +file to use +nightly just on a specific project, but either way we'll be assuming nightly +from now on.

+

Next you need devkitpro. They've +got a graphical installer for Windows, and pacman support on Linux. We'll be +using a few of their binutils for the arm-none-eabi target, and we'll also be +using some of their tools that are specific to GBA development, so even if you +already have the right binutils for whatever reason, you'll still want devkitpro +for the gbafix utility.

+
    +
  • On Windows you'll want something like C:\devkitpro\devkitARM\bin and +C:\devkitpro\tools\bin to be added to your +PATH, depending on where you +installed it to and such.
    • +
  • On Linux you'll also want it to be added to your path, but if you're using +Linux I'll just assume you know how to do all that.
    • +
+

Finally, you'll need cargo-xbuild. Just run cargo install cargo-xbuild and +cargo will figure it all out for you.

+

Per Project Setup

 +

Now you'll need some particular files each time you want to start a new project. +You can find them in the root of the rust-console/gba +repo.

+
    +
  • thumbv4-none-eabi.json describes the overall GBA to cargo-xbuild so it knows +what to do.
    • +
  • crt0.s describes some ASM startup stuff. If you have more ASM to place here +later on this is where you can put it. You also need to build it into a +crt0.o file before it can actually be used, but we'll cover that below.
    • +
  • linker.ld tells the linker more critical info about the layout expectations +that the GBA has about our program.
    • +
+

Compiling

 +

Once you've got something to build, you perform the following steps:

+
    +
  • +

    arm-none-eabi-as crt0.s -o crt0.o

    +
      +
    • This builds your text format crt0.s file into object format crt0.o. You +don't need to perform it every time, only when crt0.s changes, but you +might as well do it every time so that you never forget to because it's a +practically instant operation.
      • +
    +
    • +
  • +

    cargo xbuild --target thumbv4-none-eabi.json

    +
      +
    • This builds your Rust source. It accepts most of the normal options, such +as --release, and options, such as --bin foo or --examples, that you'd +expect cargo to accept.
      • +
    • You can not build and run tests this way, because they require std, +which the GBA doesn't have. You can still run some of your project's tests +with cargo test, but that builds for your local machine, so anything +specific to the GBA (such as reading and writing registers) won't be +testable that way. If you want to isolate and try out some piece code +running on the GBA you'll unfortunately have to make a demo for it in your +examples/ directory and then run the demo in an emulator and see if it +does what you expect.
      • +
    • The file extension is important. cargo xbuild takes it as a flag to +compile dependencies with the same sysroot, so you can include crates +normally. Well, creates that work in the GBA's limited environment, but you +get the idea.
      • +
    +
    • +
+

At this point you have an ELF binary that some emulators can execute directly. +This is helpful because it'll have debug symbols and all that, assuming a debug +build. Specifically, mgba 0.1 beta +1 can do it, and perhaps other +emulators can also do it.

+

However, if you want a "real" ROM that works in all emulators and that you could +transfer to a flash cart there's a little more to do.

+
    +
  • +

    arm-none-eabi-objcopy -O binary target/thumbv4-none-eabi/MODE/BIN_NAME target/ROM_NAME.gba

    +
      +
    • This will perform an objcopy on our +program. Here I've named the program arm-none-eabi-objcopy, which is what +devkitpro calls their version of objcopy that's specific to the GBA in the +Windows install. If the program isn't found under that name, have a look in +your installation directory to see if it's under a slightly different name +or something.
      • +
    • As you can see from reading the man page, the -O binary option takes our +lovely ELF file with symbols and all that and strips it down to basically a +bare memory dump of the program.
      • +
    • The next argument is the input file. You might not be familiar with how +cargo arranges stuff in the target/ directory, and between RLS and +cargo doc and stuff it gets kinda crowded, so it goes like this: +
        +
      • Since our program was built for a non-local target, first we've got a +directory named for that target, thumbv4-none-eabi/
        • +
      • Next, the "MODE" is either debug/ or release/, depending on if we had +the --release flag included. You'll probably only be packing release +mode programs all the way into GBA roms, but it works with either mode.
        • +
      • Finally, the name of the program. If your program is something out of the +project's src/bin/ then it'll be that file's name, or whatever name you +configured for the bin in the Cargo.toml file. If your program is +something out of the project's examples/ directory there will be a +similar examples/ sub-directory first, and then the example's name.
        • +
      +
      • +
    • The final argument is the output of the objcopy, which I suggest putting +at just the top level of the target/ directory. Really it could go +anywhere, but if you're using git then it's likely that your .gitignore +file is already setup to exclude everything in target/, so this makes sure +that your intermediate game builds don't get checked into your git.
      • +
    +
    • +
  • +

    gbafix target/ROM_NAME.gba

    +
      +
    • The gbafix tool also comes from devkitpro. The GBA is very picky about a +ROM's format, and gbafix patches the ROM's header and such so that it'll +work right. Unlike objcopy, this tool is custom built for GBA development, +so it works just perfectly without any arguments beyond the file name. The +ROM is patched in place, so we don't even need to specify a new destination.
      • +
    +
    • +
+

And you're finally done!

+

Of course, you probably want to make a script for all that, but it's up to you.

+

Ch 1: Hello GBA

 +

Traditionally a person writes a "hello, world" program so that they can test +that their development environment is setup properly and to just get a feel for +using the tools involved. To get an idea of what a small part of a source file +will look like. All that stuff.

+

Normally, you write a program that prints "hello, world" to the terminal. The +GBA has no terminal, but it does have a screen, so instead we're going to draw +three dots to the screen.

+

hello1

 +

Ready? Here goes:

+

hello1.rs

+
#![feature(start)]
+#![no_std]
+
+#[cfg(not(test))]
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+  loop {}
+}
+
+#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+  unsafe {
+    (0x04000000 as *mut u16).write_volatile(0x0403);
+    (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F);
+    (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0);
+    (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00);
+    loop {}
+  }
+}
+
+

Throw that into your project, build the program (as described back in Chapter +0), and give it a run. You should see a red, green, and blue dot close-ish to +the middle of the screen. If you don't, something already went wrong. Double +check things, phone a friend, write your senators, try asking Ketsuban on the +Rust Community Discord, until you're +able to get your three dots going.

+

Explaining hello1

 +

So, what just happened? Even if you're used to Rust that might look pretty +strange. We'll go over each part extra carefully.

+

+# #![allow(unused_variables)]
+#![feature(start)]
+#fn main() {
+#}
+

This enables the start +feature, +which you would normally be able to read about in the unstable book, except that +the book tells you nothing at all except to look at the tracking +issue.

+

Basically, a GBA game is even more low-level than the normal amount of +low-level that you get from Rust, so we have to tell the compiler to account for +that by specifying a #[start], and we need this feature on to do that.

+

+# #![allow(unused_variables)]
+#![no_std]
+#fn main() {
+#}
+

There's no standard library available on the GBA, so we'll have to live a core +only life.

+

+# #![allow(unused_variables)]
+#fn main() {
+#[cfg(not(test))]
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+  loop {}
+}
+#}
+

This sets our panic +handler. +Basically, if we somehow trigger a panic, this is where the program goes. +However, right now we don't know how to get any sort of message out to the user +so... we do nothing at all. We can't even return from here, so we just sit in +an infinite loop. The player will have to reset the universe from the outside.

+

The #[cfg(not(test))] part makes this item only exist in the program when +we're not in a test build. This is so that cargo test and such work right as +much as possible.

+
#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+
+

This is our #[start]. We call it main, but the signature looks a lot more +like the main from C than it does the main from Rust. Actually, those inputs are +useless, because nothing will be calling our code from the outside. Similarly, +it's totally undefined to return anything, so the fact that we output an isize +is vacuously true at best. We just have to use this function signature because +that's how #[start] works, not because the inputs and outputs are meaningful.

+

+# #![allow(unused_variables)]
+#fn main() {
+  unsafe {
+#}
+

I hope you're all set for some unsafe, because there's a lot of it to be had.

+

+# #![allow(unused_variables)]
+#fn main() {
+    (0x04000000 as *mut u16).write_volatile(0x0403);
+#}
+

Sure!

+

+# #![allow(unused_variables)]
+#fn main() {
+    (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F);
+    (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0);
+    (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00);
+#}
+

Ah, of course.

+

+# #![allow(unused_variables)]
+#fn main() {
+    loop {}
+  }
+}
+#}
+

And, as mentioned above, there's no place for a GBA program to "return to", so +we can't ever let main try to return there. Instead, we go into an infinite +loop that does nothing. The fact that this doesn't ever return an isize +value doesn't seem to bother Rust, because I guess we're at least not returning +any other type of thing instead.

+

Fun fact: unlike in C++, an infinite loop with no side effects isn't Undefined +Behavior for us rustaceans... semantically. In truth LLVM has a known +bug in this area, so we won't +actually be relying on empty loops in any future programs.

+

All Those Magic Numbers

 +

Alright, I cheated quite a bit in the middle there. The program works, but I +didn't really tell you why because I didn't really tell you what any of those +magic numbers mean or do.

+
    +
  • 0x04000000 is the address of an IO Register called the Display Control.
    • +
  • 0x06000000 is the start of Video RAM.
    • +
+

So we write some magic to the display control register once, then we write some +other magic to three locations of magic to the Video RAM. We get three dots, +each in their own location... so that second part makes sense at least.

+

We'll get into the magic number details in the other sections of this chapter.

+

Sidebar: Volatile

 +

We'll get into what all that is in a moment, but first let's ask ourselves: Why +are we doing volatile writes? You've probably never used it before at all. +What is volatile anyway?

+

Well, the optimizer is pretty aggressive some of the time, and so it'll skip +reads and writes when it thinks can. Like if you write to a pointer once, and +then again a moment later, and it didn't see any other reads in between, it'll +think that it can just skip doing that first write since it'll get overwritten +anyway. Sometimes that's right, but sometimes it's wrong.

+

Marking a read or write as volatile tells the compiler that it really must do +that action, and in the exact order that we wrote it out. It says that there +might even be special hardware side effects going on that the compiler isn't +aware of. In this case, the Display Control write sets a video mode, and the +Video RAM writes set pixels that will show up on the screen.

+

Similar to "atomic" operations you might have heard about, all volatile +operations are enforced to happen in the exact order that you specify them, but +only relative to other volatile operations. So something like

+

+# #![allow(unused_variables)]
+#fn main() {
+c.volatile_write(5);
+a += b;
+d.volatile_write(7);
+#}
+

might end up changing a either before or after the change to c, but the +write to d will always happen after the write to c.

+

If you ever use volatile stuff on other platforms it's important to note that +volatile doesn't make things thread-safe, you still need atomic for that. +However, the GBA doesn't have threads, so we don't have to worry about thread +safety concerns.

+

IO Registers

 +

The GBA has a large number of IO Registers (not to be confused with CPU +registers). These are special memory locations from 0x04000000 to +0x040003FE. GBATEK has a full +list, but we only need to learn +about a few of them at a time as we go, so don't be worried.

+

The important facts to know about IO Registers are these:

+
    +
  • Each has their own specific size. Most are u16, but some are u32.
    • +
  • All of them must be accessed in a volatile style.
    • +
  • Each register is specifically readable or writable or both. Actually, with +some registers there are even individual bits that are read-only or +write-only. +
      +
    • If you write to a read-only position, those writes are simply ignored. This +mostly matters if a writable register contains a read-only bit (such as the +Display Control, next section).
      • +
    • If you read from a write-only position, you get back values that are +basically +nonsense. There +aren't really any registers that mix writable bits with read only bits, so +you're basically safe here. The only (mild) concern is that when you write a +value into a write-only register you need to keep track of what you wrote +somewhere else if you want to know what you wrote (such to adjust an offset +value by +1, or whatever).
      • +
    • You can always check GBATEK to be sure, but if I don't mention it then a bit +is probably both read and write.
      • +
    +
    • +
  • Some registers have invalid bit patterns. For example, the lowest three bits +of the Display Control register can't legally be set to the values 6 or 7.
    • +
+

When talking about bit positions, the numbers are zero indexed just like an +array index is.

+

The Display Control

 +

The Display Control is our first actual IO Register. GBATEK gives it the +shorthand DISPCNT, so +you might see it under that name if you read other guides.

+

Among IO Registers, it's one of the simpler ones, but it's got enough complexity +that we can get a hint of what's to come.

+

Also it's the one that you basically always need to set at least once in every +GBA game, so it's a good starting one to go over for that reason too.

+

The Display Control is a u16 value located at 0x0400_0000.

+

Video Modes

 +

The lowest three bits (0-2) let you select from among the GBA's six video modes. +You'll notice that 3 bits allows for eight modes, but the values 6 and 7 are +prohibited.

+

Modes 0, 1, and 2 are "Tiled" modes. These are actually the modes that you +should eventually learn to use as much as possible. It lets the GBA's limited +video hardware do as much of the work as possible, leaving more of your CPU time +for gameplay computations. However, they're also complex enough to deserve their +own demos and chapters later on, so that's all we'll say about them for now.

+

Modes 3, 4, and 5 are "Bitmap" modes. These let you write individual pixels to +locations on the screen.

+
    +
  • Mode 3 is full resolution (240w x 160h) RBG15 color. You might not be used to +RGB15, since modern computers have 24 or 32 bit colors. In RGB15, there's 5 +bits for each color channel, and the highest bit is totally ignored.
    • +
  • Mode 4 is full resolution paletted color. Instead of being a u16 color, each +pixel value is a u8 palette index entry, and then the display uses the +palette memory (which we'll talk about later) to store the actual color data. +Since each pixel is half sized, we can fit twice as many. This lets us have +two "pages". At any given moment only one page is active, and you can draw to +the other page without the user noticing. You set which page to show with +another bit we'll get to in a moment.
    • +
  • Mode 5 is full color, but also with pages. This means that we must have a +reduced resolution to compensate (video memory is only so big!). The screen is +effectively only 160w x 128h in this mode.
    • +
+

CGB Mode

 +

Bit 3 is read only. It's on if you're running in CGB mode. Since we're making +GBA games you'd think that it'll never be on at all, but I guess you can change +it with BIOS stuff. Still, basically not an important bit.

+

Page Flipping

 +

Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or +5, and is just ignored otherwise. It's very easy to remember: when the bit is 0 +the 0th page is used, and when the bit is 1 the 1st page is used.

+

The second page always starts at 0x0600_A000.

+

OAM, VRAM, and Blanking

 +

Bit 5 lets you access OAM during HBlank if enabled. This is cool, but it reduces +the maximum sprites per scanline, so it's not default.

+

Bit 6 lets you adjust if the GBA should treat Object Character VRAM as being 2d +(off) or 1d (on).

+

Bit 7 forces the screen to stay in vblank as long as it's set. This allows the +fastest use of the VRAM, Palette, and Object Attribute Memory. Obviously if you +leave this on for too long the player will notice a blank screen, but it might +be okay to use for a moment or two every once in a while.

+

Screen Layers

 +

Bits 8 through 11 control if Background layers 0 through 3 should be active.

+

Bit 12 affects the Object layer.

+

Note that not all background layers are available in all video modes:

+
    +
  • Mode 0: all
    • +
  • Mode 1: 0/1/2
    • +
  • Mode 2: 2/3
    • +
  • Mode 3/4/5: 2
    • +
+

Bit 13 and 14 enable the display of Windows 0 and 1, and Bit 15 enables the +object display window. We'll get into how windows work later on, they let you do +some nifty graphical effects.

+

In Conclusion...

 +

So what did we do to the display control in hello1?

+

+# #![allow(unused_variables)]
+#fn main() {
+    (0x04000000 as *mut u16).write_volatile(0x0403);
+#}
+

First let's convert that to +binary, and we get +0b100_0000_0011. So, that's setting Mode 3 with background 2 enabled and +nothing else special.

+

Video Memory Intro

 +

The GBA's Video RAM is 96k stretching from 0x0600_0000 to 0x0601_7FFF.

+

The Video RAM can only be accessed totally freely during a Vertical Blank +(aka "vblank"). At other times, if the CPU tries to touch the same part of video +memory as the display controller is accessing then the CPU gets bumped by a +cycle to avoid a clash.

+

Annoyingly, VRAM can only be properly written to in 16 and 32 bit segments (same +with PALRAM and OAM). If you try to write just an 8 bit segment, then both parts +of the 16 bit segment get the same value written to them. In other words, if you +write the byte 5 to 0x0600_0000, then both 0x0600_0000 and ALSO +0x0600_0001 will have the byte 5 in them. We have to be extra careful when +trying to set an individual byte, and we also have to be careful if we use +memcopy or memset as well, because they're byte oriented by default and +don't know to follow the special rules.

+

RGB15

 +

TODO

+

Mode 3

 +

TODO

+

Mode 4

 +

TODO

+

Mode 5

 +

TODO

+

In Conclusion...

 +

TODO

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It's very \"work in progress\". At the moment there's only one demo program.","breadcrumbs":"Introduction","id":"0","title":"Introduction"},"1":{"body":"If you want to read more about developing on the GBA there are some other good resources as well: Tonc , a tutorial series written for C, but it's what I based the ordering of this book's sections on. GBATEK , a homebrew tech manual for GBA/NDS/DSi. We will regularly link to parts of it when talking about various bits of the GBA.","breadcrumbs":"Other Works","id":"1","title":"Other Works"},"10":{"body":"We'll get into what all that is in a moment, but first let's ask ourselves: Why are we doing volatile writes? You've probably never used it before at all. What is volatile anyway? Well, the optimizer is pretty aggressive some of the time, and so it'll skip reads and writes when it thinks can. Like if you write to a pointer once, and then again a moment later, and it didn't see any other reads in between, it'll think that it can just skip doing that first write since it'll get overwritten anyway. Sometimes that's right, but sometimes it's wrong. Marking a read or write as volatile tells the compiler that it really must do that action, and in the exact order that we wrote it out. It says that there might even be special hardware side effects going on that the compiler isn't aware of. In this case, the Display Control write sets a video mode, and the Video RAM writes set pixels that will show up on the screen. Similar to \"atomic\" operations you might have heard about, all volatile operations are enforced to happen in the exact order that you specify them, but only relative to other volatile operations. So something like c.volatile_write(5);\na += b;\nd.volatile_write(7); might end up changing a either before or after the change to c , but the write to d will always happen after the write to c . If you ever use volatile stuff on other platforms it's important to note that volatile doesn't make things thread-safe, you still need atomic for that. However, the GBA doesn't have threads, so we don't have to worry about thread safety concerns.","breadcrumbs":"Ch 1: Hello GBA » Sidebar: Volatile","id":"10","title":"Sidebar: Volatile"},"11":{"body":"The GBA has a large number of IO Registers (not to be confused with CPU registers). These are special memory locations from 0x04000000 to 0x040003FE . GBATEK has a full list , but we only need to learn about a few of them at a time as we go, so don't be worried. The important facts to know about IO Registers are these: Each has their own specific size. Most are u16 , but some are u32 . All of them must be accessed in a volatile style. Each register is specifically readable or writable or both. Actually, with some registers there are even individual bits that are read-only or write-only. If you write to a read-only position, those writes are simply ignored. This mostly matters if a writable register contains a read-only bit (such as the Display Control, next section). If you read from a write-only position, you get back values that are basically nonsense . There aren't really any registers that mix writable bits with read only bits, so you're basically safe here. The only (mild) concern is that when you write a value into a write-only register you need to keep track of what you wrote somewhere else if you want to know what you wrote (such to adjust an offset value by +1, or whatever). You can always check GBATEK to be sure, but if I don't mention it then a bit is probably both read and write. Some registers have invalid bit patterns. For example, the lowest three bits of the Display Control register can't legally be set to the values 6 or 7. When talking about bit positions, the numbers are zero indexed just like an array index is.","breadcrumbs":"Ch 1: Hello GBA » IO Registers","id":"11","title":"IO Registers"},"12":{"body":"The Display Control is our first actual IO Register. GBATEK gives it the shorthand DISPCNT , so you might see it under that name if you read other guides. Among IO Registers, it's one of the simpler ones, but it's got enough complexity that we can get a hint of what's to come. Also it's the one that you basically always need to set at least once in every GBA game, so it's a good starting one to go over for that reason too. The Display Control is a u16 value located at 0x0400_0000 .","breadcrumbs":"Ch 1: Hello GBA » The Display Control","id":"12","title":"The Display Control"},"13":{"body":"The lowest three bits (0-2) let you select from among the GBA's six video modes. You'll notice that 3 bits allows for eight modes, but the values 6 and 7 are prohibited. Modes 0, 1, and 2 are \"Tiled\" modes. These are actually the modes that you should eventually learn to use as much as possible. It lets the GBA's limited video hardware do as much of the work as possible, leaving more of your CPU time for gameplay computations. However, they're also complex enough to deserve their own demos and chapters later on, so that's all we'll say about them for now. Modes 3, 4, and 5 are \"Bitmap\" modes. These let you write individual pixels to locations on the screen. Mode 3 is full resolution (240w x 160h) RBG15 color. You might not be used to RGB15, since modern computers have 24 or 32 bit colors. In RGB15, there's 5 bits for each color channel, and the highest bit is totally ignored. Mode 4 is full resolution paletted color. Instead of being a u16 color, each pixel value is a u8 palette index entry, and then the display uses the palette memory (which we'll talk about later) to store the actual color data. Since each pixel is half sized, we can fit twice as many. This lets us have two \"pages\". At any given moment only one page is active, and you can draw to the other page without the user noticing. You set which page to show with another bit we'll get to in a moment. Mode 5 is full color, but also with pages. This means that we must have a reduced resolution to compensate (video memory is only so big!). The screen is effectively only 160w x 128h in this mode.","breadcrumbs":"Ch 1: Hello GBA » Video Modes","id":"13","title":"Video Modes"},"14":{"body":"Bit 3 is read only. It's on if you're running in CGB mode. Since we're making GBA games you'd think that it'll never be on at all, but I guess you can change it with BIOS stuff. Still, basically not an important bit.","breadcrumbs":"Ch 1: Hello GBA » CGB Mode","id":"14","title":"CGB Mode"},"15":{"body":"Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or 5, and is just ignored otherwise. It's very easy to remember: when the bit is 0 the 0th page is used, and when the bit is 1 the 1st page is used. The second page always starts at 0x0600_A000 .","breadcrumbs":"Ch 1: Hello GBA » Page Flipping","id":"15","title":"Page Flipping"},"16":{"body":"Bit 5 lets you access OAM during HBlank if enabled. This is cool, but it reduces the maximum sprites per scanline, so it's not default. Bit 6 lets you adjust if the GBA should treat Object Character VRAM as being 2d (off) or 1d (on). Bit 7 forces the screen to stay in vblank as long as it's set. This allows the fastest use of the VRAM, Palette, and Object Attribute Memory. Obviously if you leave this on for too long the player will notice a blank screen, but it might be okay to use for a moment or two every once in a while.","breadcrumbs":"Ch 1: Hello GBA » OAM, VRAM, and Blanking","id":"16","title":"OAM, VRAM, and Blanking"},"17":{"body":"Bits 8 through 11 control if Background layers 0 through 3 should be active. Bit 12 affects the Object layer. Note that not all background layers are available in all video modes: Mode 0: all Mode 1: 0/1/2 Mode 2: 2/3 Mode 3/4/5: 2 Bit 13 and 14 enable the display of Windows 0 and 1, and Bit 15 enables the object display window. We'll get into how windows work later on, they let you do some nifty graphical effects.","breadcrumbs":"Ch 1: Hello GBA » Screen Layers","id":"17","title":"Screen Layers"},"18":{"body":"So what did we do to the display control in hello1 ? (0x04000000 as *mut u16).write_volatile(0x0403); First let's convert that to binary , and we get 0b100_0000_0011 . So, that's setting Mode 3 with background 2 enabled and nothing else special.","breadcrumbs":"Ch 1: Hello GBA » In Conclusion...","id":"18","title":"In Conclusion..."},"19":{"body":"The GBA's Video RAM is 96k stretching from 0x0600_0000 to 0x0601_7FFF . The Video RAM can only be accessed totally freely during a Vertical Blank (aka \"vblank\"). At other times, if the CPU tries to touch the same part of video memory as the display controller is accessing then the CPU gets bumped by a cycle to avoid a clash. Annoyingly, VRAM can only be properly written to in 16 and 32 bit segments (same with PALRAM and OAM). If you try to write just an 8 bit segment, then both parts of the 16 bit segment get the same value written to them. In other words, if you write the byte 5 to 0x0600_0000 , then both 0x0600_0000 and ALSO 0x0600_0001 will have the byte 5 in them. We have to be extra careful when trying to set an individual byte, and we also have to be careful if we use memcopy or memset as well, because they're byte oriented by default and don't know to follow the special rules.","breadcrumbs":"Ch 1: Hello GBA » Video Memory Intro","id":"19","title":"Video Memory Intro"},"2":{"body":"Before you can build a GBA game you'll have to follow some special steps to setup the development environment. Perhaps unfortunately, there's enough detail here to warrant a mini-chapter all on its own.","breadcrumbs":"Chapter 0: Development Setup","id":"2","title":"Chapter 0: Development Setup"},"20":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » RGB15","id":"20","title":"RGB15"},"21":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » Mode 3","id":"21","title":"Mode 3"},"22":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » Mode 4","id":"22","title":"Mode 4"},"23":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » Mode 5","id":"23","title":"Mode 5"},"24":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » In Conclusion...","id":"24","title":"In Conclusion..."},"3":{"body":"Obviously you need your computer to have a working rust installation. However, you'll also need to ensure that you're using a nightly toolchain. You can run rustup default nightly to set nightly as the system wide default toolchain, or you can use a toolchain file to use nightly just on a specific project, but either way we'll be assuming nightly from now on. Next you need devkitpro . They've got a graphical installer for Windows, and pacman support on Linux. We'll be using a few of their binutils for the arm-none-eabi target, and we'll also be using some of their tools that are specific to GBA development, so even if you already have the right binutils for whatever reason, you'll still want devkitpro for the gbafix utility. On Windows you'll want something like C:\\devkitpro\\devkitARM\\bin and C:\\devkitpro\\tools\\bin to be added to your PATH , depending on where you installed it to and such. On Linux you'll also want it to be added to your path, but if you're using Linux I'll just assume you know how to do all that. Finally, you'll need cargo-xbuild . Just run cargo install cargo-xbuild and cargo will figure it all out for you.","breadcrumbs":"Per System Setup","id":"3","title":"Per System Setup"},"4":{"body":"Now you'll need some particular files each time you want to start a new project. You can find them in the root of the rust-console/gba repo . thumbv4-none-eabi.json describes the overall GBA to cargo-xbuild so it knows what to do. crt0.s describes some ASM startup stuff. If you have more ASM to place here later on this is where you can put it. You also need to build it into a crt0.o file before it can actually be used, but we'll cover that below. linker.ld tells the linker more critical info about the layout expectations that the GBA has about our program.","breadcrumbs":"Per Project Setup","id":"4","title":"Per Project Setup"},"5":{"body":"Once you've got something to build, you perform the following steps: arm-none-eabi-as crt0.s -o crt0.o This builds your text format crt0.s file into object format crt0.o . You don't need to perform it every time, only when crt0.s changes, but you might as well do it every time so that you never forget to because it's a practically instant operation. cargo xbuild --target thumbv4-none-eabi.json This builds your Rust source. It accepts most of the normal options, such as --release , and options, such as --bin foo or --examples , that you'd expect cargo to accept. You can not build and run tests this way, because they require std , which the GBA doesn't have. You can still run some of your project's tests with cargo test , but that builds for your local machine, so anything specific to the GBA (such as reading and writing registers) won't be testable that way. If you want to isolate and try out some piece code running on the GBA you'll unfortunately have to make a demo for it in your examples/ directory and then run the demo in an emulator and see if it does what you expect. The file extension is important. cargo xbuild takes it as a flag to compile dependencies with the same sysroot, so you can include crates normally. Well, creates that work in the GBA's limited environment, but you get the idea. At this point you have an ELF binary that some emulators can execute directly. This is helpful because it'll have debug symbols and all that, assuming a debug build. Specifically, mgba 0.1 beta 1 can do it, and perhaps other emulators can also do it. However, if you want a \"real\" ROM that works in all emulators and that you could transfer to a flash cart there's a little more to do. arm-none-eabi-objcopy -O binary target/thumbv4-none-eabi/MODE/BIN_NAME target/ROM_NAME.gba This will perform an objcopy on our program. Here I've named the program arm-none-eabi-objcopy , which is what devkitpro calls their version of objcopy that's specific to the GBA in the Windows install. If the program isn't found under that name, have a look in your installation directory to see if it's under a slightly different name or something. As you can see from reading the man page, the -O binary option takes our lovely ELF file with symbols and all that and strips it down to basically a bare memory dump of the program. The next argument is the input file. You might not be familiar with how cargo arranges stuff in the target/ directory, and between RLS and cargo doc and stuff it gets kinda crowded, so it goes like this: Since our program was built for a non-local target, first we've got a directory named for that target, thumbv4-none-eabi/ Next, the \"MODE\" is either debug/ or release/ , depending on if we had the --release flag included. You'll probably only be packing release mode programs all the way into GBA roms, but it works with either mode. Finally, the name of the program. If your program is something out of the project's src/bin/ then it'll be that file's name, or whatever name you configured for the bin in the Cargo.toml file. If your program is something out of the project's examples/ directory there will be a similar examples/ sub-directory first, and then the example's name. The final argument is the output of the objcopy , which I suggest putting at just the top level of the target/ directory. Really it could go anywhere, but if you're using git then it's likely that your .gitignore file is already setup to exclude everything in target/ , so this makes sure that your intermediate game builds don't get checked into your git. gbafix target/ROM_NAME.gba The gbafix tool also comes from devkitpro. The GBA is very picky about a ROM's format, and gbafix patches the ROM's header and such so that it'll work right. Unlike objcopy , this tool is custom built for GBA development, so it works just perfectly without any arguments beyond the file name. The ROM is patched in place, so we don't even need to specify a new destination. And you're finally done! Of course, you probably want to make a script for all that, but it's up to you.","breadcrumbs":"Compiling","id":"5","title":"Compiling"},"6":{"body":"Traditionally a person writes a \"hello, world\" program so that they can test that their development environment is setup properly and to just get a feel for using the tools involved. To get an idea of what a small part of a source file will look like. All that stuff. Normally, you write a program that prints \"hello, world\" to the terminal. The GBA has no terminal, but it does have a screen, so instead we're going to draw three dots to the screen.","breadcrumbs":"Ch 1: Hello GBA","id":"6","title":"Ch 1: Hello GBA"},"7":{"body":"Ready? Here goes: hello1.rs #![feature(start)]\n#![no_std] #[cfg(not(test))]\n#[panic_handler]\nfn panic(_info: &core::panic::PanicInfo) -> ! { loop {}\n} #[start]\nfn main(_argc: isize, _argv: *const *const u8) -> isize { unsafe { (0x04000000 as *mut u16).write_volatile(0x0403); (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F); (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0); (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00); loop {} }\n} Throw that into your project, build the program (as described back in Chapter 0), and give it a run. You should see a red, green, and blue dot close-ish to the middle of the screen. If you don't, something already went wrong. Double check things, phone a friend, write your senators, try asking Ketsuban on the Rust Community Discord , until you're able to get your three dots going.","breadcrumbs":"Ch 1: Hello GBA » hello1","id":"7","title":"hello1"},"8":{"body":"So, what just happened? Even if you're used to Rust that might look pretty strange. We'll go over each part extra carefully. #![feature(start)] This enables the start feature , which you would normally be able to read about in the unstable book, except that the book tells you nothing at all except to look at the tracking issue . Basically, a GBA game is even more low-level than the normal amount of low-level that you get from Rust, so we have to tell the compiler to account for that by specifying a #[start] , and we need this feature on to do that. #![no_std] There's no standard library available on the GBA, so we'll have to live a core only life. #[cfg(not(test))]\n#[panic_handler]\nfn panic(_info: &core::panic::PanicInfo) -> ! { loop {}\n} This sets our panic handler . Basically, if we somehow trigger a panic, this is where the program goes. However, right now we don't know how to get any sort of message out to the user so... we do nothing at all. We can't even return from here, so we just sit in an infinite loop. The player will have to reset the universe from the outside. The #[cfg(not(test))] part makes this item only exist in the program when we're not in a test build. This is so that cargo test and such work right as much as possible. #[start]\nfn main(_argc: isize, _argv: *const *const u8) -> isize { This is our #[start] . We call it main , but the signature looks a lot more like the main from C than it does the main from Rust. Actually, those inputs are useless, because nothing will be calling our code from the outside. Similarly, it's totally undefined to return anything, so the fact that we output an isize is vacuously true at best. We just have to use this function signature because that's how #[start] works, not because the inputs and outputs are meaningful. unsafe { I hope you're all set for some unsafe , because there's a lot of it to be had. (0x04000000 as *mut u16).write_volatile(0x0403); Sure! (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F); (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0); (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00); Ah, of course. loop {} }\n} And, as mentioned above, there's no place for a GBA program to \"return to\", so we can't ever let main try to return there. Instead, we go into an infinite loop that does nothing. The fact that this doesn't ever return an isize value doesn't seem to bother Rust, because I guess we're at least not returning any other type of thing instead. Fun fact: unlike in C++, an infinite loop with no side effects isn't Undefined Behavior for us rustaceans... semantically . In truth LLVM has a known bug in this area, so we won't actually be relying on empty loops in any future programs.","breadcrumbs":"Ch 1: Hello GBA » Explaining hello1","id":"8","title":"Explaining hello1"},"9":{"body":"Alright, I cheated quite a bit in the middle there. The program works, but I didn't really tell you why because I didn't really tell you what any of those magic numbers mean or do. 0x04000000 is the address of an IO Register called the Display Control. 0x06000000 is the start of Video RAM. So we write some magic to the display control register once, then we write some other magic to three locations of magic to the Video RAM. We get three dots, each in their own location... so that second part makes sense at least. 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a book that'll help you program in Rust on the GBA. It's very \"work in progress\". At the moment there's only one demo program.","breadcrumbs":"Introduction","id":"0","title":"Introduction"},"1":{"body":"If you want to read more about developing on the GBA there are some other good resources as well: Tonc , a tutorial series written for C, but it's what I based the ordering of this book's sections on. GBATEK , a homebrew tech manual for GBA/NDS/DSi. We will regularly link to parts of it when talking about various bits of the GBA.","breadcrumbs":"Other Works","id":"1","title":"Other Works"},"10":{"body":"We'll get into what all that is in a moment, but first let's ask ourselves: Why are we doing volatile writes? You've probably never used it before at all. What is volatile anyway? Well, the optimizer is pretty aggressive some of the time, and so it'll skip reads and writes when it thinks can. Like if you write to a pointer once, and then again a moment later, and it didn't see any other reads in between, it'll think that it can just skip doing that first write since it'll get overwritten anyway. Sometimes that's right, but sometimes it's wrong. Marking a read or write as volatile tells the compiler that it really must do that action, and in the exact order that we wrote it out. It says that there might even be special hardware side effects going on that the compiler isn't aware of. In this case, the Display Control write sets a video mode, and the Video RAM writes set pixels that will show up on the screen. Similar to \"atomic\" operations you might have heard about, all volatile operations are enforced to happen in the exact order that you specify them, but only relative to other volatile operations. So something like c.volatile_write(5);\na += b;\nd.volatile_write(7); might end up changing a either before or after the change to c , but the write to d will always happen after the write to c . If you ever use volatile stuff on other platforms it's important to note that volatile doesn't make things thread-safe, you still need atomic for that. However, the GBA doesn't have threads, so we don't have to worry about thread safety concerns.","breadcrumbs":"Ch 1: Hello GBA » Sidebar: Volatile","id":"10","title":"Sidebar: Volatile"},"11":{"body":"The GBA has a large number of IO Registers (not to be confused with CPU registers). These are special memory locations from 0x04000000 to 0x040003FE . GBATEK has a full list , but we only need to learn about a few of them at a time as we go, so don't be worried. The important facts to know about IO Registers are these: Each has their own specific size. Most are u16 , but some are u32 . All of them must be accessed in a volatile style. Each register is specifically readable or writable or both. Actually, with some registers there are even individual bits that are read-only or write-only. If you write to a read-only position, those writes are simply ignored. This mostly matters if a writable register contains a read-only bit (such as the Display Control, next section). If you read from a write-only position, you get back values that are basically nonsense . There aren't really any registers that mix writable bits with read only bits, so you're basically safe here. The only (mild) concern is that when you write a value into a write-only register you need to keep track of what you wrote somewhere else if you want to know what you wrote (such to adjust an offset value by +1, or whatever). You can always check GBATEK to be sure, but if I don't mention it then a bit is probably both read and write. Some registers have invalid bit patterns. For example, the lowest three bits of the Display Control register can't legally be set to the values 6 or 7. When talking about bit positions, the numbers are zero indexed just like an array index is.","breadcrumbs":"Ch 1: Hello GBA » IO Registers","id":"11","title":"IO Registers"},"12":{"body":"The Display Control is our first actual IO Register. GBATEK gives it the shorthand DISPCNT , so you might see it under that name if you read other guides. Among IO Registers, it's one of the simpler ones, but it's got enough complexity that we can get a hint of what's to come. Also it's the one that you basically always need to set at least once in every GBA game, so it's a good starting one to go over for that reason too. The Display Control is a u16 value located at 0x0400_0000 .","breadcrumbs":"Ch 1: Hello GBA » The Display Control","id":"12","title":"The Display Control"},"13":{"body":"The lowest three bits (0-2) let you select from among the GBA's six video modes. You'll notice that 3 bits allows for eight modes, but the values 6 and 7 are prohibited. Modes 0, 1, and 2 are \"Tiled\" modes. These are actually the modes that you should eventually learn to use as much as possible. It lets the GBA's limited video hardware do as much of the work as possible, leaving more of your CPU time for gameplay computations. However, they're also complex enough to deserve their own demos and chapters later on, so that's all we'll say about them for now. Modes 3, 4, and 5 are \"Bitmap\" modes. These let you write individual pixels to locations on the screen. Mode 3 is full resolution (240w x 160h) RBG15 color. You might not be used to RGB15, since modern computers have 24 or 32 bit colors. In RGB15, there's 5 bits for each color channel, and the highest bit is totally ignored. Mode 4 is full resolution paletted color. Instead of being a u16 color, each pixel value is a u8 palette index entry, and then the display uses the palette memory (which we'll talk about later) to store the actual color data. Since each pixel is half sized, we can fit twice as many. This lets us have two \"pages\". At any given moment only one page is active, and you can draw to the other page without the user noticing. You set which page to show with another bit we'll get to in a moment. Mode 5 is full color, but also with pages. This means that we must have a reduced resolution to compensate (video memory is only so big!). The screen is effectively only 160w x 128h in this mode.","breadcrumbs":"Ch 1: Hello GBA » Video Modes","id":"13","title":"Video Modes"},"14":{"body":"Bit 3 is read only. It's on if you're running in CGB mode. Since we're making GBA games you'd think that it'll never be on at all, but I guess you can change it with BIOS stuff. Still, basically not an important bit.","breadcrumbs":"Ch 1: Hello GBA » CGB Mode","id":"14","title":"CGB Mode"},"15":{"body":"Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or 5, and is just ignored otherwise. It's very easy to remember: when the bit is 0 the 0th page is used, and when the bit is 1 the 1st page is used. The second page always starts at 0x0600_A000 .","breadcrumbs":"Ch 1: Hello GBA » Page Flipping","id":"15","title":"Page Flipping"},"16":{"body":"Bit 5 lets you access OAM during HBlank if enabled. This is cool, but it reduces the maximum sprites per scanline, so it's not default. Bit 6 lets you adjust if the GBA should treat Object Character VRAM as being 2d (off) or 1d (on). Bit 7 forces the screen to stay in vblank as long as it's set. This allows the fastest use of the VRAM, Palette, and Object Attribute Memory. Obviously if you leave this on for too long the player will notice a blank screen, but it might be okay to use for a moment or two every once in a while.","breadcrumbs":"Ch 1: Hello GBA » OAM, VRAM, and Blanking","id":"16","title":"OAM, VRAM, and Blanking"},"17":{"body":"Bits 8 through 11 control if Background layers 0 through 3 should be active. Bit 12 affects the Object layer. Note that not all background layers are available in all video modes: Mode 0: all Mode 1: 0/1/2 Mode 2: 2/3 Mode 3/4/5: 2 Bit 13 and 14 enable the display of Windows 0 and 1, and Bit 15 enables the object display window. We'll get into how windows work later on, they let you do some nifty graphical effects.","breadcrumbs":"Ch 1: Hello GBA » Screen Layers","id":"17","title":"Screen Layers"},"18":{"body":"So what did we do to the display control in hello1 ? (0x04000000 as *mut u16).write_volatile(0x0403); First let's convert that to binary , and we get 0b100_0000_0011 . So, that's setting Mode 3 with background 2 enabled and nothing else special.","breadcrumbs":"Ch 1: Hello GBA » In Conclusion...","id":"18","title":"In Conclusion..."},"19":{"body":"The GBA's Video RAM is 96k stretching from 0x0600_0000 to 0x0601_7FFF . The Video RAM can only be accessed totally freely during a Vertical Blank (aka \"vblank\"). At other times, if the CPU tries to touch the same part of video memory as the display controller is accessing then the CPU gets bumped by a cycle to avoid a clash. Annoyingly, VRAM can only be properly written to in 16 and 32 bit segments (same with PALRAM and OAM). If you try to write just an 8 bit segment, then both parts of the 16 bit segment get the same value written to them. In other words, if you write the byte 5 to 0x0600_0000 , then both 0x0600_0000 and ALSO 0x0600_0001 will have the byte 5 in them. We have to be extra careful when trying to set an individual byte, and we also have to be careful if we use memcopy or memset as well, because they're byte oriented by default and don't know to follow the special rules.","breadcrumbs":"Ch 1: Hello GBA » Video Memory Intro","id":"19","title":"Video Memory Intro"},"2":{"body":"Before you can build a GBA game you'll have to follow some special steps to setup the development environment. Perhaps unfortunately, there's enough detail here to warrant a mini-chapter all on its own.","breadcrumbs":"Chapter 0: Development Setup","id":"2","title":"Chapter 0: Development Setup"},"20":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » RGB15","id":"20","title":"RGB15"},"21":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » Mode 3","id":"21","title":"Mode 3"},"22":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » Mode 4","id":"22","title":"Mode 4"},"23":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » Mode 5","id":"23","title":"Mode 5"},"24":{"body":"TODO","breadcrumbs":"Ch 1: Hello GBA » In Conclusion...","id":"24","title":"In Conclusion..."},"3":{"body":"Obviously you need your computer to have a working rust installation. However, you'll also need to ensure that you're using a nightly toolchain. You can run rustup default nightly to set nightly as the system wide default toolchain, or you can use a toolchain file to use nightly just on a specific project, but either way we'll be assuming nightly from now on. Next you need devkitpro . They've got a graphical installer for Windows, and pacman support on Linux. We'll be using a few of their binutils for the arm-none-eabi target, and we'll also be using some of their tools that are specific to GBA development, so even if you already have the right binutils for whatever reason, you'll still want devkitpro for the gbafix utility. On Windows you'll want something like C:\\devkitpro\\devkitARM\\bin and C:\\devkitpro\\tools\\bin to be added to your PATH , depending on where you installed it to and such. On Linux you'll also want it to be added to your path, but if you're using Linux I'll just assume you know how to do all that. Finally, you'll need cargo-xbuild . Just run cargo install cargo-xbuild and cargo will figure it all out for you.","breadcrumbs":"Per System Setup","id":"3","title":"Per System Setup"},"4":{"body":"Now you'll need some particular files each time you want to start a new project. You can find them in the root of the rust-console/gba repo . thumbv4-none-eabi.json describes the overall GBA to cargo-xbuild so it knows what to do. crt0.s describes some ASM startup stuff. If you have more ASM to place here later on this is where you can put it. You also need to build it into a crt0.o file before it can actually be used, but we'll cover that below. linker.ld tells the linker more critical info about the layout expectations that the GBA has about our program.","breadcrumbs":"Per Project Setup","id":"4","title":"Per Project Setup"},"5":{"body":"Once you've got something to build, you perform the following steps: arm-none-eabi-as crt0.s -o crt0.o This builds your text format crt0.s file into object format crt0.o . You don't need to perform it every time, only when crt0.s changes, but you might as well do it every time so that you never forget to because it's a practically instant operation. cargo xbuild --target thumbv4-none-eabi.json This builds your Rust source. It accepts most of the normal options, such as --release , and options, such as --bin foo or --examples , that you'd expect cargo to accept. You can not build and run tests this way, because they require std , which the GBA doesn't have. You can still run some of your project's tests with cargo test , but that builds for your local machine, so anything specific to the GBA (such as reading and writing registers) won't be testable that way. If you want to isolate and try out some piece code running on the GBA you'll unfortunately have to make a demo for it in your examples/ directory and then run the demo in an emulator and see if it does what you expect. The file extension is important. cargo xbuild takes it as a flag to compile dependencies with the same sysroot, so you can include crates normally. Well, creates that work in the GBA's limited environment, but you get the idea. At this point you have an ELF binary that some emulators can execute directly. This is helpful because it'll have debug symbols and all that, assuming a debug build. Specifically, mgba 0.1 beta 1 can do it, and perhaps other emulators can also do it. However, if you want a \"real\" ROM that works in all emulators and that you could transfer to a flash cart there's a little more to do. arm-none-eabi-objcopy -O binary target/thumbv4-none-eabi/MODE/BIN_NAME target/ROM_NAME.gba This will perform an objcopy on our program. Here I've named the program arm-none-eabi-objcopy , which is what devkitpro calls their version of objcopy that's specific to the GBA in the Windows install. If the program isn't found under that name, have a look in your installation directory to see if it's under a slightly different name or something. As you can see from reading the man page, the -O binary option takes our lovely ELF file with symbols and all that and strips it down to basically a bare memory dump of the program. The next argument is the input file. You might not be familiar with how cargo arranges stuff in the target/ directory, and between RLS and cargo doc and stuff it gets kinda crowded, so it goes like this: Since our program was built for a non-local target, first we've got a directory named for that target, thumbv4-none-eabi/ Next, the \"MODE\" is either debug/ or release/ , depending on if we had the --release flag included. You'll probably only be packing release mode programs all the way into GBA roms, but it works with either mode. Finally, the name of the program. If your program is something out of the project's src/bin/ then it'll be that file's name, or whatever name you configured for the bin in the Cargo.toml file. If your program is something out of the project's examples/ directory there will be a similar examples/ sub-directory first, and then the example's name. The final argument is the output of the objcopy , which I suggest putting at just the top level of the target/ directory. Really it could go anywhere, but if you're using git then it's likely that your .gitignore file is already setup to exclude everything in target/ , so this makes sure that your intermediate game builds don't get checked into your git. gbafix target/ROM_NAME.gba The gbafix tool also comes from devkitpro. The GBA is very picky about a ROM's format, and gbafix patches the ROM's header and such so that it'll work right. Unlike objcopy , this tool is custom built for GBA development, so it works just perfectly without any arguments beyond the file name. The ROM is patched in place, so we don't even need to specify a new destination. And you're finally done! Of course, you probably want to make a script for all that, but it's up to you.","breadcrumbs":"Compiling","id":"5","title":"Compiling"},"6":{"body":"Traditionally a person writes a \"hello, world\" program so that they can test that their development environment is setup properly and to just get a feel for using the tools involved. To get an idea of what a small part of a source file will look like. All that stuff. Normally, you write a program that prints \"hello, world\" to the terminal. The GBA has no terminal, but it does have a screen, so instead we're going to draw three dots to the screen.","breadcrumbs":"Ch 1: Hello GBA","id":"6","title":"Ch 1: Hello GBA"},"7":{"body":"Ready? Here goes: hello1.rs #![feature(start)]\n#![no_std] #[cfg(not(test))]\n#[panic_handler]\nfn panic(_info: &core::panic::PanicInfo) -> ! { loop {}\n} #[start]\nfn main(_argc: isize, _argv: *const *const u8) -> isize { unsafe { (0x04000000 as *mut u16).write_volatile(0x0403); (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F); (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0); (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00); loop {} }\n} Throw that into your project, build the program (as described back in Chapter 0), and give it a run. You should see a red, green, and blue dot close-ish to the middle of the screen. If you don't, something already went wrong. Double check things, phone a friend, write your senators, try asking Ketsuban on the Rust Community Discord , until you're able to get your three dots going.","breadcrumbs":"Ch 1: Hello GBA » hello1","id":"7","title":"hello1"},"8":{"body":"So, what just happened? Even if you're used to Rust that might look pretty strange. We'll go over each part extra carefully. #![feature(start)] This enables the start feature , which you would normally be able to read about in the unstable book, except that the book tells you nothing at all except to look at the tracking issue . Basically, a GBA game is even more low-level than the normal amount of low-level that you get from Rust, so we have to tell the compiler to account for that by specifying a #[start] , and we need this feature on to do that. #![no_std] There's no standard library available on the GBA, so we'll have to live a core only life. #[cfg(not(test))]\n#[panic_handler]\nfn panic(_info: &core::panic::PanicInfo) -> ! { loop {}\n} This sets our panic handler . Basically, if we somehow trigger a panic, this is where the program goes. However, right now we don't know how to get any sort of message out to the user so... we do nothing at all. We can't even return from here, so we just sit in an infinite loop. The player will have to reset the universe from the outside. The #[cfg(not(test))] part makes this item only exist in the program when we're not in a test build. This is so that cargo test and such work right as much as possible. #[start]\nfn main(_argc: isize, _argv: *const *const u8) -> isize { This is our #[start] . We call it main , but the signature looks a lot more like the main from C than it does the main from Rust. Actually, those inputs are useless, because nothing will be calling our code from the outside. Similarly, it's totally undefined to return anything, so the fact that we output an isize is vacuously true at best. We just have to use this function signature because that's how #[start] works, not because the inputs and outputs are meaningful. unsafe { I hope you're all set for some unsafe , because there's a lot of it to be had. (0x04000000 as *mut u16).write_volatile(0x0403); Sure! (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F); (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0); (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00); Ah, of course. loop {} }\n} And, as mentioned above, there's no place for a GBA program to \"return to\", so we can't ever let main try to return there. Instead, we go into an infinite loop that does nothing. The fact that this doesn't ever return an isize value doesn't seem to bother Rust, because I guess we're at least not returning any other type of thing instead. Fun fact: unlike in C++, an infinite loop with no side effects isn't Undefined Behavior for us rustaceans... semantically . In truth LLVM has a known bug in this area, so we won't actually be relying on empty loops in any future programs.","breadcrumbs":"Ch 1: Hello GBA » Explaining hello1","id":"8","title":"Explaining hello1"},"9":{"body":"Alright, I cheated quite a bit in the middle there. The program works, but I didn't really tell you why because I didn't really tell you what any of those magic numbers mean or do. 0x04000000 is the address of an IO Register called the Display Control. 0x06000000 is the start of Video RAM. So we write some magic to the display control register once, then we write some other magic to three locations of magic to the Video RAM. We get three dots, each in their own location... so that second part makes sense at least. 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\ No newline at end of file diff --git a/examples/hello1.rs b/examples/hello1.rs new file mode 100644 index 0000000..e00d918 --- /dev/null +++ b/examples/hello1.rs @@ -0,0 +1,19 @@ +#![feature(start)] +#![no_std] + +#[cfg(not(test))] +#[panic_handler] +fn panic(_info: &core::panic::PanicInfo) -> ! { + loop {} +} + +#[start] +fn main(_argc: isize, _argv: *const *const u8) -> isize { + unsafe { + (0x04000000 as *mut u16).write_volatile(0x0403); + (0x06000000 as *mut u16).offset(120 + 80 * 240).write_volatile(0x001F); + (0x06000000 as *mut u16).offset(136 + 80 * 240).write_volatile(0x03E0); + (0x06000000 as *mut u16).offset(120 + 96 * 240).write_volatile(0x7C00); + loop {} + } +} diff --git a/linker.ld b/linker.ld new file mode 100644 index 0000000..60ca1f5 --- /dev/null +++ b/linker.ld @@ -0,0 +1,63 @@ +ENTRY(__start) + +MEMORY { + ewram (w!x) : ORIGIN = 0x2000000, LENGTH = 256K + iwram (w!x) : ORIGIN = 0x3000000, LENGTH = 32K + rom (rx) : ORIGIN = 0x8000000, LENGTH = 32M +} + +SECTIONS { + .text : { + KEEP(crt0.o(.text)); + *(.text .text.*); + . = ALIGN(4); + } >rom = 0xff + + .rodata : { + *(.rodata .rodata.*); + . = ALIGN(4); + } >rom = 0xff + + __data_lma = .; + .data : { + __data_start = ABSOLUTE(.); + *(.data .data.*); + . = ALIGN(4); + __data_end = ABSOLUTE(.); + } >iwram AT>rom = 0xff + + /* debugging sections */ + /* Stabs */ + .stab 0 : { *(.stab) } + .stabstr 0 : { *(.stabstr) } + .stab.excl 0 : { *(.stab.excl) } + .stab.exclstr 0 : { *(.stab.exclstr) } + .stab.index 0 : { *(.stab.index) } + .stab.indexstr 0 : { *(.stab.indexstr) } + .comment 0 : { *(.comment) } + /* DWARF 1 */ + .debug 0 : { *(.debug) } + .line 0 : { *(.line) } + /* GNU DWARF 1 extensions */ + .debug_srcinfo 0 : { *(.debug_srcinfo) } + .debug_sfnames 0 : { *(.debug_sfnames) } + /* DWARF 1.1 and DWARF 2 */ + .debug_aranges 0 : { *(.debug_aranges) } + .debug_pubnames 0 : { *(.debug_pubnames) } + /* DWARF 2 */ + .debug_info 0 : { *(.debug_info) } + .debug_abbrev 0 : { *(.debug_abbrev) } + .debug_line 0 : { *(.debug_line) } + .debug_frame 0 : { *(.debug_frame) } + .debug_str 0 : { *(.debug_str) } + .debug_loc 0 : { *(.debug_loc) } + .debug_macinfo 0 : { *(.debug_macinfo) } + /* SGI/MIPS DWARF 2 extensions */ + .debug_weaknames 0 : { *(.debug_weaknames) } + .debug_funcnames 0 : { *(.debug_funcnames) } + .debug_typenames 0 : { *(.debug_typenames) } + .debug_varnames 0 : { *(.debug_varnames) } + + /* discard anything not already mentioned */ + /DISCARD/ : { *(*) } +} diff --git a/src/io_registers.rs b/src/io_registers.rs index eeb8738..c14c867 100644 --- a/src/io_registers.rs +++ b/src/io_registers.rs @@ -15,6 +15,8 @@ // TODO(lokathor): IO Register newtypes. +use gba_proc_macro::register_bit; + use super::*; /// LCD Control. Read/Write. @@ -30,18 +32,6 @@ pub struct DisplayControlSetting(u16); #[allow(missing_docs)] impl DisplayControlSetting { pub const BG_MODE_MASK: u16 = 0b111; - pub const PAGE_SELECT_BIT: u16 = 0b1_0000; - pub const HBLANK_INTERVAL_FREE_BIT: u16 = 0b10_0000; - pub const OBJ_1D_BIT: u16 = 0b100_0000; - pub const FORCE_BLANK_BIT: u16 = 0b1000_0000; - pub const DISPLAY_BG0_BIT: u16 = 0b1_0000_0000; - pub const DISPLAY_BG1_BIT: u16 = 0b10_0000_0000; - pub const DISPLAY_BG2_BIT: u16 = 0b100_0000_0000; - pub const DISPLAY_BG3_BIT: u16 = 0b1000_0000_0000; - pub const DISPLAY_OBJ_BIT: u16 = 0b1_0000_0000_0000; - pub const DISPLAY_WINDOW0_BIT: u16 = 0b10_0000_0000_0000; - pub const DISPLAY_WINDOW1_BIT: u16 = 0b100_0000_0000_0000; - pub const OBJ_WINDOW_BIT: u16 = 0b1000_0000_0000_0000; pub fn mode(&self) -> DisplayControlMode { match self.0 & Self::BG_MODE_MASK { @@ -66,137 +56,19 @@ impl DisplayControlSetting { }; } - pub fn uses_page_1(&self) -> bool { - (self.0 & Self::PAGE_SELECT_BIT) != 0 - } - pub fn set_uses_page_1(&mut self, bit: bool) { - if bit { - self.0 |= Self::PAGE_SELECT_BIT; - } else { - self.0 &= !Self::PAGE_SELECT_BIT; - } - } - - pub fn hblank_interval_free(&self) -> bool { - (self.0 & Self::HBLANK_INTERVAL_FREE_BIT) != 0 - } - pub fn set_hblank_interval_free(&mut self, bit: bool) { - if bit { - self.0 |= Self::HBLANK_INTERVAL_FREE_BIT; - } else { - self.0 &= !Self::HBLANK_INTERVAL_FREE_BIT; - } - } - - pub fn object_memory_1d(&self) -> bool { - (self.0 & Self::OBJ_1D_BIT) != 0 - } - pub fn set_object_memory_1d(&mut self, bit: bool) { - if bit { - self.0 |= Self::OBJ_1D_BIT; - } else { - self.0 &= !Self::OBJ_1D_BIT; - } - } - - pub fn force_blank(&self) -> bool { - (self.0 & Self::FORCE_BLANK_BIT) != 0 - } - pub fn set_force_blank(&mut self, bit: bool) { - if bit { - self.0 |= Self::FORCE_BLANK_BIT; - } else { - self.0 &= !Self::FORCE_BLANK_BIT; - } - } - - pub fn display_bg0(&self) -> bool { - (self.0 & Self::DISPLAY_BG0_BIT) != 0 - } - pub fn set_display_bg0(&mut self, bit: bool) { - if bit { - self.0 |= Self::DISPLAY_BG0_BIT; - } else { - self.0 &= !Self::DISPLAY_BG0_BIT; - } - } - - pub fn display_bg1(&self) -> bool { - (self.0 & Self::DISPLAY_BG1_BIT) != 0 - } - pub fn set_display_bg1(&mut self, bit: bool) { - if bit { - self.0 |= Self::DISPLAY_BG1_BIT; - } else { - self.0 &= !Self::DISPLAY_BG1_BIT; - } - } - - pub fn display_bg2(&self) -> bool { - (self.0 & Self::DISPLAY_BG2_BIT) != 0 - } - pub fn set_display_bg2(&mut self, bit: bool) { - if bit { - self.0 |= Self::DISPLAY_BG2_BIT; - } else { - self.0 &= !Self::DISPLAY_BG2_BIT; - } - } - - pub fn display_bg3(&self) -> bool { - (self.0 & Self::DISPLAY_BG3_BIT) != 0 - } - pub fn set_display_bg3(&mut self, bit: bool) { - if bit { - self.0 |= Self::DISPLAY_BG3_BIT; - } else { - self.0 &= !Self::DISPLAY_BG3_BIT; - } - } - - pub fn display_object(&self) -> bool { - (self.0 & Self::DISPLAY_OBJ_BIT) != 0 - } - pub fn set_display_object(&mut self, bit: bool) { - if bit { - self.0 |= Self::DISPLAY_OBJ_BIT; - } else { - self.0 &= !Self::DISPLAY_OBJ_BIT; - } - } - - pub fn display_window0(&self) -> bool { - (self.0 & Self::DISPLAY_WINDOW0_BIT) != 0 - } - pub fn set_display_window0(&mut self, bit: bool) { - if bit { - self.0 |= Self::DISPLAY_WINDOW0_BIT; - } else { - self.0 &= !Self::DISPLAY_WINDOW0_BIT; - } - } - - pub fn display_window1(&self) -> bool { - (self.0 & Self::DISPLAY_WINDOW1_BIT) != 0 - } - pub fn set_display_window1(&mut self, bit: bool) { - if bit { - self.0 |= Self::DISPLAY_WINDOW1_BIT; - } else { - self.0 &= !Self::DISPLAY_WINDOW1_BIT; - } - } - - pub fn display_object_window(&self) -> bool { - (self.0 & Self::OBJ_WINDOW_BIT) != 0 - } - pub fn set_display_object_window(&mut self, bit: bool) { - if bit { - self.0 |= Self::OBJ_WINDOW_BIT; - } else { - self.0 &= !Self::OBJ_WINDOW_BIT; - } - } + register_bit!(CGB_MODE_BIT, u16, 0b1000, cgb_mode, read); + register_bit!(PAGE_SELECT_BIT, u16, 0b1_0000, page1_enabled, read_write); + register_bit!(HBLANK_INTERVAL_FREE_BIT, u16, 0b10_0000, hblank_interval_free, read_write); + register_bit!(OBJECT_MEMORY_1D, u16, 0b100_0000, object_memory_1d, read_write); + register_bit!(FORCE_BLANK_BIT, u16, 0b1000_0000, force_blank, read_write); + register_bit!(DISPLAY_BG0_BIT, u16, 0b1_0000_0000, display_bg0, read_write); + register_bit!(DISPLAY_BG1_BIT, u16, 0b10_0000_0000, display_bg1, read_write); + register_bit!(DISPLAY_BG2_BIT, u16, 0b100_0000_0000, display_bg2, read_write); + register_bit!(DISPLAY_BG3_BIT, u16, 0b1000_0000_0000, display_bg3, read_write); + register_bit!(DISPLAY_OBJECT_BIT, u16, 0b1_0000_0000_0000, display_object, read_write); + register_bit!(DISPLAY_WINDOW0_BIT, u16, 0b10_0000_0000_0000, display_window0, read_write); + register_bit!(DISPLAY_WINDOW1_BIT, u16, 0b100_0000_0000_0000, display_window1, read_write); + register_bit!(OBJECT_WINDOW_BIT, u16, 0b1000_0000_0000_0000, display_object_window, read_write); } /// The six display modes available on the GBA. diff --git a/src/video_ram.rs b/src/video_ram.rs index 5f3519d..a4f2699 100644 --- a/src/video_ram.rs +++ b/src/video_ram.rs @@ -1,16 +1,31 @@ -use super::*; +//! Module for all things relating to the Video RAM. +//! +//! Note that that GBA has six different display modes available, and the +//! _meaning_ of Video RAM depends on which display mode is active. In all +//! cases, Video RAM is **96kb** from `0x0600_0000` to `0x0601_7FFF`. +//! +//! # Safety +//! +//! Note that all possible bit patterns are technically allowed within Video +//! Memory. If you write the "wrong" thing into video memory you don't crash the +//! GBA, instead you just get graphical glitches (or perhaps nothing at all). +//! Accordingly, the "safe" functions here will check that you're in bounds, but +//! they won't bother to check that you've set the video mode they're designed +//! for. -/// The width of the GBA screen. +//use super::*; + +/// The physical width in pixels of the GBA screen. pub const SCREEN_WIDTH: isize = 240; -/// The height of the GBA screen. +/// The physical height in pixels of the GBA screen. pub const SCREEN_HEIGHT: isize = 160; /// The start of VRAM. /// /// Depending on what display mode is currently set there's different ways that /// your program should interpret the VRAM space. Accordingly, we give the raw -/// value as just being a usize. +/// value as just being a `usize`. pub const VRAM_BASE_ADDRESS: usize = 0x0600_0000; /// Draws a pixel to the screen while in Display Mode 3. @@ -24,6 +39,13 @@ pub const VRAM_BASE_ADDRESS: usize = 0x0600_0000; /// /// * `col` must be in `0..SCREEN_WIDTH` /// * `row` must be in `0..SCREEN_HEIGHT` -pub unsafe fn mode3_plot(col: isize, row: isize, color: u16) { +pub unsafe fn mode3_plot_unchecked(col: isize, row: isize, color: u16) { core::ptr::write_volatile((VRAM_BASE_ADDRESS as *mut u16).offset(col + row * SCREEN_WIDTH), color); } + +/// Draws a pixel to the screen while in Display Mode 3, with bounds checks. +pub fn mode3_plot(col: isize, row: isize, color: u16) { + assert!(col >= 0 && col < SCREEN_WIDTH); + assert!(row >= 0 && row < SCREEN_HEIGHT); + unsafe { mode3_plot_unchecked(col, row, color) } +}