Embedded Working Group Meeting 2024-01-30

Attendance

Write your GH username or Matrix handle here!

Announcements
- RustNL embedded embedded impl days/unconference
  - 2 days attached to the https://2024.rustnl.org/ conference
  - likely Thu + Fri (May 9 + May 10) in Delft, NL
- rp2040-hal 0.9.2 released
- rtic v2 working on stable rust: https://github.com/rtic-rs/rtic/pull/888
Embedded HAL
- Infallible SPI CS pins https://github.com/rust-embedded/embedded-hal/pull/574
Cortex-M
- Bad c-m-rt errors?
  - https://github.com/rust-embedded/cortex-m/issues/509
  - Have linker errors changed since these were written?

Announcements
- svdtools 0.3.9 released
Embedded HAL
- ADC/voltmeter/ammeter traits https://github.com/rust-embedded/embedded-hal/pull/569
  - Having volts and amps seems a bit arbitrary; should we also have temperature and light level and etc etc?
  - There might be some value in such a set of traits but it doesn't seem like they belong in e-h
  - Probably the original plan of an ADC trait is a better fit for embedded-hal, but there are design questions to resolve
- SPI sharing with fallible CS pins https://github.com/rust-embedded/embedded-hal/issues/573
  - Perhaps the whole shared bus could be poisoned to reduce the runtime overhead
  - But given the rarity of requiring fallible pins and not being able to just wrap them in a panicking wrapper, perhaps option 1 remains the best option for e-h-bus, with users requiring more sophisticated sharing/error handling able to roll their own
  - @GrantM11235 to write a PR
svd2rust
- Safe/unsafe writers https://github.com/rust-embedded/svd2rust/pull/788
Continue last week's discussion on interrupt macro syntax across crates