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"display control" to "display control register"

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Lokathor 2018-11-11 00:25:26 -07:00
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book/src/SUMMARY.md
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@ -6,6 +6,6 @@
* [Ch 1: Hello GBA](ch1/index.md) * [Ch 1: Hello GBA](ch1/index.md)
* [hello1](ch1/hello1.md) * [hello1](ch1/hello1.md)
* [IO Registers](ch1/io_registers.md) * [IO Registers](ch1/io_registers.md)
* [The Display Control](ch1/the_display_control.md) * [The Display Control Register](ch1/the_display_control_register.md)
* [Video Memory Intro](ch1/video_memory_intro.md) * [Video Memory Intro](ch1/video_memory_intro.md)
* [hello2](ch1/hello2.md) * [hello2](ch1/hello2.md)

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book/src/ch1/the_display_control.md → book/src/ch1/the_display_control_register.md
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@ -10,7 +10,7 @@ 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 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. 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`. The display control register holds a `u16` value, and is located at `0x0400_0000`.
## Video Modes ## Video Modes
@ -45,8 +45,8 @@ locations on the screen.
## CGB Mode ## CGB Mode
Bit 3 is effectively read only. Technically it can be flipped using a BIOS call, Bit 3 is effectively read only. Technically it can be flipped using a BIOS call,
but when you write to the display control normally it won't write to this bit, but when you write to the display control register normally it won't write to
so we'll call it effectively read only. this bit, so we'll call it effectively read only.
This bit is on if the CPU is in CGB mode. This bit is on if the CPU is in CGB mode.
@ -90,7 +90,7 @@ some nifty graphical effects.
## In Conclusion... ## In Conclusion...
So what did we do to the display control in `hello1`? So what did we do to the display control register in `hello1`?
```rust ```rust
(0x04000000 as *mut u16).write_volatile(0x0403); (0x04000000 as *mut u16).write_volatile(0x0403);

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</script> </script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents"> <nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html" class="active"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control.html"><strong aria-hidden="true">3.3.</strong> The Display Control</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol> <ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html" class="active"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control_register.html"><strong aria-hidden="true">3.3.</strong> The Display Control Register</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol>
</nav> </nav>
<div id="page-wrapper" class="page-wrapper"> <div id="page-wrapper" class="page-wrapper">
@ -216,7 +216,7 @@ get the idea.</li>
</ul> </ul>
<p>At this point you have an ELF binary that some emulators can execute directly. <p>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 This is helpful because it'll have debug symbols and all that, assuming a debug
build. Specifically, <a href="https://mgba.io/2018/09/24/mgba-0.7-beta1/">mgba 0.1 beta build. Specifically, <a href="https://mgba.io/2018/09/24/mgba-0.7-beta1/">mgba 0.7 beta
1</a> can do it, and perhaps other 1</a> can do it, and perhaps other
emulators can also do it.</p> emulators can also do it.</p>
<p>However, if you want a &quot;real&quot; ROM that works in all emulators and that you could <p>However, if you want a &quot;real&quot; ROM that works in all emulators and that you could

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</script> </script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents"> <nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html" class="active"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control.html"><strong aria-hidden="true">3.3.</strong> The Display Control</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol> <ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html" class="active"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control_register.html"><strong aria-hidden="true">3.3.</strong> The Display Control Register</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol>
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</script> </script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents"> <nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control.html"><strong aria-hidden="true">3.3.</strong> The Display Control</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html" class="active"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol> <ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control_register.html"><strong aria-hidden="true">3.3.</strong> The Display Control Register</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html" class="active"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol>
</nav> </nav>
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@ -72,7 +72,7 @@
</script> </script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents"> <nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html" class="active"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control.html"><strong aria-hidden="true">3.3.</strong> The Display Control</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol> <ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html" class="active"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control_register.html"><strong aria-hidden="true">3.3.</strong> The Display Control Register</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol>
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@ -72,7 +72,7 @@
</script> </script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents"> <nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html" class="active"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control.html"><strong aria-hidden="true">3.3.</strong> The Display Control</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol> <ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html" class="active"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control_register.html"><strong aria-hidden="true">3.3.</strong> The Display Control Register</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol>
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<div id="page-wrapper" class="page-wrapper"> <div id="page-wrapper" class="page-wrapper">
@ -182,7 +182,7 @@ array index is.</p>
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<i class="fa fa-angle-right"></i> <i class="fa fa-angle-right"></i>
</a> </a>
@ -200,7 +200,7 @@ array index is.</p>
<a href="../ch1/the_display_control.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> <a href="../ch1/the_display_control_register.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
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@ -3,7 +3,7 @@
<head> <head>
<!-- Book generated using mdBook --> <!-- Book generated using mdBook -->
<meta charset="UTF-8"> <meta charset="UTF-8">
<title>The Display Control - Rust GBA Tutorials</title> <title>The Display Control Register - Rust GBA Tutorials</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta name="description" content=""> <meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="viewport" content="width=device-width, initial-scale=1">
@ -72,7 +72,7 @@
</script> </script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents"> <nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control.html" class="active"><strong aria-hidden="true">3.3.</strong> The Display Control</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol> <ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control_register.html" class="active"><strong aria-hidden="true">3.3.</strong> The Display Control Register</a></li><li><a href="../ch1/video_memory_intro.html"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol>
</nav> </nav>
<div id="page-wrapper" class="page-wrapper"> <div id="page-wrapper" class="page-wrapper">
@ -136,15 +136,15 @@
<div id="content" class="content"> <div id="content" class="content">
<main> <main>
<a class="header" href="#the-display-control" id="the-display-control"><h1>The Display Control</h1></a> <a class="header" href="#the-display-control-register" id="the-display-control-register"><h1>The Display Control Register</h1></a>
<p>The Display Control is our first actual IO Register. GBATEK gives it the <p>The display control register is our first actual IO Register. GBATEK gives it the
shorthand <a href="http://problemkaputt.de/gbatek.htm#lcdiodisplaycontrol">DISPCNT</a>, so shorthand <a href="http://problemkaputt.de/gbatek.htm#lcdiodisplaycontrol">DISPCNT</a>, so
you might see it under that name if you read other guides.</p> you might see it under that name if you read other guides.</p>
<p>Among IO Registers, it's one of the simpler ones, but it's got enough complexity <p>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.</p> that we can get a hint of what's to come.</p>
<p>Also it's the one that you basically always need to set at least once in every <p>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.</p> GBA game, so it's a good starting one to go over for that reason too.</p>
<p>The Display Control is a <code>u16</code> value located at <code>0x0400_0000</code>.</p> <p>The display control register holds a <code>u16</code> value, and is located at <code>0x0400_0000</code>.</p>
<a class="header" href="#video-modes" id="video-modes"><h2>Video Modes</h2></a> <a class="header" href="#video-modes" id="video-modes"><h2>Video Modes</h2></a>
<p>The lowest three bits (0-2) let you select from among the GBA's six video modes. <p>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 You'll notice that 3 bits allows for eight modes, but the values 6 and 7 are
@ -174,8 +174,8 @@ effectively only 160w x 128h in this mode.</li>
</ul> </ul>
<a class="header" href="#cgb-mode" id="cgb-mode"><h2>CGB Mode</h2></a> <a class="header" href="#cgb-mode" id="cgb-mode"><h2>CGB Mode</h2></a>
<p>Bit 3 is effectively read only. Technically it can be flipped using a BIOS call, <p>Bit 3 is effectively read only. Technically it can be flipped using a BIOS call,
but when you write to the display control normally it won't write to this bit, but when you write to the display control register normally it won't write to
so we'll call it effectively read only.</p> this bit, so we'll call it effectively read only.</p>
<p>This bit is on if the CPU is in CGB mode.</p> <p>This bit is on if the CPU is in CGB mode.</p>
<a class="header" href="#page-flipping" id="page-flipping"><h2>Page Flipping</h2></a> <a class="header" href="#page-flipping" id="page-flipping"><h2>Page Flipping</h2></a>
<p>Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or <p>Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or
@ -205,7 +205,7 @@ be okay to use for a moment or two every once in a while.</p>
object display window. We'll get into how windows work later on, they let you do object display window. We'll get into how windows work later on, they let you do
some nifty graphical effects.</p> some nifty graphical effects.</p>
<a class="header" href="#in-conclusion" id="in-conclusion"><h2>In Conclusion...</h2></a> <a class="header" href="#in-conclusion" id="in-conclusion"><h2>In Conclusion...</h2></a>
<p>So what did we do to the display control in <code>hello1</code>?</p> <p>So what did we do to the display control register in <code>hello1</code>?</p>
<pre><pre class="playpen"><code class="language-rust"> <pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)] # #![allow(unused_variables)]
#fn main() { #fn main() {

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</script> </script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents"> <nav id="sidebar" class="sidebar" aria-label="Table of contents">
<ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control.html"><strong aria-hidden="true">3.3.</strong> The Display Control</a></li><li><a href="../ch1/video_memory_intro.html" class="active"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol> <ol class="chapter"><li><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><a href="../ch0/index.html"><strong aria-hidden="true">2.</strong> Ch 0: Development Setup</a></li><li><a href="../ch1/index.html"><strong aria-hidden="true">3.</strong> Ch 1: Hello GBA</a></li><li><ol class="section"><li><a href="../ch1/hello1.html"><strong aria-hidden="true">3.1.</strong> hello1</a></li><li><a href="../ch1/io_registers.html"><strong aria-hidden="true">3.2.</strong> IO Registers</a></li><li><a href="../ch1/the_display_control_register.html"><strong aria-hidden="true">3.3.</strong> The Display Control Register</a></li><li><a href="../ch1/video_memory_intro.html" class="active"><strong aria-hidden="true">3.4.</strong> Video Memory Intro</a></li><li><a href="../ch1/hello2.html"><strong aria-hidden="true">3.5.</strong> hello2</a></li></ol></li></ol>
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@ -239,7 +239,7 @@ binary to make sense of it.</p>
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@ -257,7 +257,7 @@ binary to make sense of it.</p>
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@ -228,7 +228,7 @@ get the idea.</li>
</ul> </ul>
<p>At this point you have an ELF binary that some emulators can execute directly. <p>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 This is helpful because it'll have debug symbols and all that, assuming a debug
build. Specifically, <a href="https://mgba.io/2018/09/24/mgba-0.7-beta1/">mgba 0.1 beta build. Specifically, <a href="https://mgba.io/2018/09/24/mgba-0.7-beta1/">mgba 0.7 beta
1</a> can do it, and perhaps other 1</a> can do it, and perhaps other
emulators can also do it.</p> emulators can also do it.</p>
<p>However, if you want a &quot;real&quot; ROM that works in all emulators and that you could <p>However, if you want a &quot;real&quot; ROM that works in all emulators and that you could
@ -490,15 +490,15 @@ of the Display Control register can't legally be set to the values 6 or 7.</li>
</ul> </ul>
<p>When talking about bit positions, the numbers are <em>zero indexed</em> just like an <p>When talking about bit positions, the numbers are <em>zero indexed</em> just like an
array index is.</p> array index is.</p>
<a class="header" href="#the-display-control" id="the-display-control"><h1>The Display Control</h1></a> <a class="header" href="#the-display-control-register" id="the-display-control-register"><h1>The Display Control Register</h1></a>
<p>The Display Control is our first actual IO Register. GBATEK gives it the <p>The display control register is our first actual IO Register. GBATEK gives it the
shorthand <a href="http://problemkaputt.de/gbatek.htm#lcdiodisplaycontrol">DISPCNT</a>, so shorthand <a href="http://problemkaputt.de/gbatek.htm#lcdiodisplaycontrol">DISPCNT</a>, so
you might see it under that name if you read other guides.</p> you might see it under that name if you read other guides.</p>
<p>Among IO Registers, it's one of the simpler ones, but it's got enough complexity <p>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.</p> that we can get a hint of what's to come.</p>
<p>Also it's the one that you basically always need to set at least once in every <p>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.</p> GBA game, so it's a good starting one to go over for that reason too.</p>
<p>The Display Control is a <code>u16</code> value located at <code>0x0400_0000</code>.</p> <p>The display control register holds a <code>u16</code> value, and is located at <code>0x0400_0000</code>.</p>
<a class="header" href="#video-modes" id="video-modes"><h2>Video Modes</h2></a> <a class="header" href="#video-modes" id="video-modes"><h2>Video Modes</h2></a>
<p>The lowest three bits (0-2) let you select from among the GBA's six video modes. <p>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 You'll notice that 3 bits allows for eight modes, but the values 6 and 7 are
@ -528,8 +528,8 @@ effectively only 160w x 128h in this mode.</li>
</ul> </ul>
<a class="header" href="#cgb-mode" id="cgb-mode"><h2>CGB Mode</h2></a> <a class="header" href="#cgb-mode" id="cgb-mode"><h2>CGB Mode</h2></a>
<p>Bit 3 is effectively read only. Technically it can be flipped using a BIOS call, <p>Bit 3 is effectively read only. Technically it can be flipped using a BIOS call,
but when you write to the display control normally it won't write to this bit, but when you write to the display control register normally it won't write to
so we'll call it effectively read only.</p> this bit, so we'll call it effectively read only.</p>
<p>This bit is on if the CPU is in CGB mode.</p> <p>This bit is on if the CPU is in CGB mode.</p>
<a class="header" href="#page-flipping" id="page-flipping"><h2>Page Flipping</h2></a> <a class="header" href="#page-flipping" id="page-flipping"><h2>Page Flipping</h2></a>
<p>Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or <p>Bit 4 lets you pick which page to use. This is only relevent in video modes 4 or
@ -559,7 +559,7 @@ be okay to use for a moment or two every once in a while.</p>
object display window. We'll get into how windows work later on, they let you do object display window. We'll get into how windows work later on, they let you do
some nifty graphical effects.</p> some nifty graphical effects.</p>
<a class="header" href="#in-conclusion" id="in-conclusion"><h2>In Conclusion...</h2></a> <a class="header" href="#in-conclusion" id="in-conclusion"><h2>In Conclusion...</h2></a>
<p>So what did we do to the display control in <code>hello1</code>?</p> <p>So what did we do to the display control register in <code>hello1</code>?</p>
<pre><pre class="playpen"><code class="language-rust"> <pre><pre class="playpen"><code class="language-rust">
# #![allow(unused_variables)] # #![allow(unused_variables)]
#fn main() { #fn main() {

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