Embedded Working Group Meeting 2024-04-30

Attendance

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Announcements
- embedded-hal-bus 0.2 released with AtomicDevice
- Target docs for thumb targets PR underway: https://github.com/rust-lang/rust/pull/124404
- @thejpster stepping down from wg and leadership council
- next week's meeting is skipped, resuming the week after (on 14th may)
Embedded HAL
- AtomicDevice use of portable_atomic means build fails on armv6 https://github.com/rust-embedded/embedded-hal/issues/598
  - add atomic-device feature, enable AtomicDevice if feature is enabled or cfg(target_has_atomic..), add atomic-critical-section and atomic-unsafe-assume-single-core (or portable-atomic-…?) which proxy to p-a and also enable atomic-device, document this, release as 0.3
Tooling docs update: https://github.com/CodingInGreen/tooling
- what to add?
Maintenance of STM32 Discovery Book?
- Is our most complete book
- Does not seem to be in widespread use anymore
- Board has changed version
- Two books is a lot
- Conclusion: don't worry about the stm32 book, mark it as more clearly archived/read-only/deprecated

Announcements
- cortex-m-rt 0.7.4 released, no bug reports yet!
- svd2rust 0.33.1 released
- microbit 0.14.0 and nrf*-hal 0.17.1 released
Embedded HAL
- Should SPI ExclusiveDevice document the initial level of the CS pin? https://github.com/almindor/mipidsi/issues/129#issuecomment-2067713648
  - Decided to have new() set CS high, but this will be a 0.2 release due to breaking API change
- AtomicDevice https://github.com/rust-embedded/embedded-hal/pull/579
  - looks good, will want to be sure docs are clear where it's expected to be used
Cortex M
- https://github.com/rust-embedded/cortex-m/pull/383
Update tooling section
- Adam H's question - general outline for more research?
Should quickstart be updated?
- Yes, needs to use latest cortex-m and cortex-m-rt and could reference probe-rs instead of openocd
Target docs update - tell people about target-cpu and target-feature?
- thejpster has a proposed update https://github.com/jonathanpallant/armtesting/tree/main/armtesting