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Add picotool to README

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Jonathan Pallant (42 Technology) 2021-09-27 16:26:57 +01:00
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README.md
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@ -196,10 +196,11 @@ For boards with USB Device support like the Raspberry Pi Pico, we recommend you
use the UF2 process.
The RP2040 contains a Cortex-M0+ processor, which implements the Thumb-2 format
of the ARMv6-M instruction set. For compatibilty with other Arm code (e.g. as
produced by GCC), Rust uses the *Arm Embedded-Application Binary Interface*
standard or EABI. Therefore, any Rust code for the RP2040 should be compiled
with the target `thumbv6m-none-eabi`.
of the ARMv6-M instruction set. There are no operating-specific features in the
binaries produced - they are for 'bare-metal' systems. For compatibilty with
other Arm code (e.g. as produced by GCC), Rust uses the *Arm
Embedded-Application Binary Interface* standard or EABI. Therefore, any Rust
code for the RP2040 should be compiled with the target `thumbv6m-none-eabi`.
More details can be found in the [Project Template](https://github.com/rp-rs/rp2040-project-template).
@ -240,7 +241,8 @@ The Knurling project has a tool called
[probe-run](https://github.com/knurling-rs/probe-run). This is a command-line
tool which can flash a wide variety of microcontrollers using a wide variety of
debug/JTAG probes. It is based on a library called
[probe-rs](https://github.com/probe-rs/probe-rs).
[probe-rs](https://github.com/probe-rs/probe-rs). Unlike using, say, OpenOCD,
probe-rs can autodetect your debug probe, which can make it easier to use.
Currently, probe-rs supports the slightly unusual debug hardware in the RP2040,
but the last released probe-run tool (v0.2.6, as of September 2021), does not.
@ -283,12 +285,28 @@ connected to the RP2040.
$ cargo run --release --example pico_pwm_blink
```
### Loading with picotool
As ELF files produced by compiling Rust code are completely compatible with ELF
files produced by compiling C or C++ code, you can also use the Raspberry Pi
tool [picoprobe](https://github.com/raspberrypi/picotool). The only thing to be
aware of is that picotool expects your ELF files to have a `.elf` extension, and
by default Rust does not give the ELF files any extension. You can fix this by
simply renaming the file.
Also of note is that the special
[pico-sdk](https://github.com/raspberrypi/pico-sdk) macros which hide
information in the ELF file in a way that `picotool info` can read it out, are
not supported in Rust. An alternative is TBC.
<!-- ROADMAP -->
## Roadmap
NOTE These packages are under active development. As such, it is likely to remain volatile until a 1.0.0 release.
NOTE These packages are under active development. As such, it is likely to
remain volatile until a 1.0.0 release.
See the [open issues](https://github.com/rp-rs/rp-hal/issues) for a list of proposed features (and known issues).
See the [open issues](https://github.com/rp-rs/rp-hal/issues) for a list of
proposed features (and known issues).
<!-- CONTRIBUTING -->
@ -331,9 +349,8 @@ under these terms.
<!-- CONTACT -->
## Contact
Project Link: [https://github.com/rp-rs/rp-hal/issues](https://github.com/rp-rs/rp-hal/issues)
Matrix: [#rp-rs:matrix.org](https://matrix.to/#/#rp-rs:matrix.org)
Raise an issue: [https://github.com/rp-rs/rp-hal/issues](https://github.com/rp-rs/rp-hal/issues)
Chat to us on Matrix: [#rp-rs:matrix.org](https://matrix.to/#/#rp-rs:matrix.org)
<!-- ACKNOWLEDGEMENTS -->
## Acknowledgements