Embedded Working Group Meeting 2023-01-10

Attendance

Write your GH username or Matrix handle here!

Announcements
- TYIER blog post
- WG social media policy in https://github.com/rust-embedded/wg/pull/651
- svd2rust 0.28.0 released
- aarch64-cpu 9.3.0, 9.3.1 released
Cortex-M
- 0.7.7 released with minor documentation fix for critical-section impl
- c-m-rt zero-init RAM PR updated https://github.com/rust-embedded/cortex-m/pull/455
  - unsure if it should zero before or after pre_init
  - possibly we can skip zeroing bss if all RAM is being zeroed
- embedded-alloc: cortex-m or hal team?
  - leave it for now?
Book
- Atomics discussion https://github.com/rust-embedded/book/issues/338
Embedded HAL
- PwmPin: https://github.com/rust-embedded/embedded-hal/pull/430
  - Keep this design or consider alternative with more methods to get maximum duty value?

Announcements
- No meeting on the next two weeks (27th dec and 3rd jan), next meeting on the 10th
- alloc-cortex-m renamed as embedded-alloc and released at 0.5, now supports any platform via critical-section crate
  - we should release alloc-cortex-m 0.4.4 marking it as deprecated and pointing to the new embedded-alloc
  - https://github.com/rust-embedded/embedded-alloc/pull/59
  - Published
- still collecting items for This Year In Embedded Rust, https://github.com/rust-embedded/blog/issues/196
cortex-m
- proposed zero-init-ram feature https://github.com/rust-embedded/cortex-m/pull/455
  - let's keep it
  - PR needs updating to include documentation and CI tests
Yank critical-section 0.2.x?
- yep
PwmPin in e-h 1.0?
- We discussed at length and settled on a single u16 duty-cycle value where 0=0%, 65535=100%, and the HAL scales intermediate values to map the timer's duty range
- https://github.com/rust-embedded/embedded-hal/pull/430