MEWS: Marine Electronics Wiki

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====== Rust ======

Notes on embedded rust.

https://github.com/rust-embedded/embedded-hal
v1.0 released January 2024, considered stable.

https://github.com/knurling-rs/app-template

===== probe-rs =====

A flashing and debug tool. Alternative to openocd and blackmagic probe.
Not actually rust specific - can flash firmware built from C for example, but written in rust and integrates with cargo.

You can also use openocd as normal with rust build files.

Supports RTT - protocol which can be used for sending debugging console text through SWD / JTAG. Needs firmware support, which sets up ring buffers which are then read by a client over the debugger connection.

''cargo embed'' will build and flash firmware, then start an RTT console.

''cargo embed'' seems to be corrupting the rtt output. Using probe-rs directly works better.
e.g. ''probe-rs attach --chip STM32F429ZITx target/thumbv7em-none-eabihf/debug/disco-test''

https://github.com/stm32-rs - peripheral access crates. Gives access to named registers, for all STM32s.


===== Debug print, I/O Interfaces =====

  * Semihosting
  * RTT
  * SWO
  * UART

RTT - works well with probe-rs, recommended. rprintln!

Semihosting not recommended. An ARM thing, uses special instructions. Slow. hprintln!
https://developer.arm.com/documentation/dui0471/g/Bgbjjgij

===== RTOSen =====

  * [[https://rtic.rs/2/book/en/|RTIC]]
  * [[https://embassy.dev/|Embassy]]


===== Learning material =====

https://mikecoats.com/stm32-blinky-rust-part-2-debug/

https://www.st.com/en/evaluation-tools/32f429idiscovery.html#documentation