Embedded Working Group Meeting 2021-07-13

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• Today's date: 2021-07-13
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Attendance

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• adamgreig
• hargoniX
• GrantM11235
• lachlansneff
• dirbaio
• richarddodd
• eldruin
• therealprof

Agenda

• Announcements
  • embedded-text 0.5-beta2 release: https://twitter.com/bugadani/status/1413881352869617671
• embedded-hal
  • invert layout of traits: spi::nb::write, spi::blocking::write?
    • Generally positive response, worth writing up a PR to get more feedback
  • Use associated Word types instead of type parameters: https://github.com/rust-embedded/embedded-hal/pull/295
    • Less clear what the advantage is compared to the current type parameters, PR description to be updated and we'll revisit next week
  • older PRs
    • Remove the various Default traits: https://github.com/rust-embedded/embedded-hal/pull/289
      • Positive support
    • Async digital/pin APIs in the async traits PR: https://github.com/rust-embedded/embedded-hal/pull/285
• cortex-m-rt
  • PR for 0.6.15 and 0.7.0
    • Please mention any bug fixes you'd like to see backported to 0.6.15 or fixed in 0.7.0 on the PR threads, https://github.com/rust-embedded/cortex-m-rt/pull/329 and https://github.com/rust-embedded/cortex-m-rt/pull/330
  • static mut transform / resource management?
    • Still unclear what the replacement is. Maybe the new syntax, maybe encourage use of RTIC, maybe just unsafe static mut for those interrupts that want it, maybe a new crate can provide it?
• Communicating work of embedded community to Rust at large
  • I (richarddodd) am not an embedded developer, but was able to get into rust-embedded code fairly easily.
  • Rust is a big opportunity to bring many people into embedded.
  • Get the word out with blog posts etc.?
    • For example a blog post on the embassy executor/intrusive linked lists would be v interesting.
• road to 1.0
  • No time this week

Last Week's Minutes

• Announcements
  • cortex-m v0.7.3 released
  • @therealprof has submitted an LLVM patch for unsigned saturating arithemtic on cortex-m
• embedded-hal
  • brief discussion about a potential Duration type or trait, or how it might interact with core's Duration, or embedded-time's Duration
• the road to 1.0 (again!)
  • recapped current state of 1.0 crates
    • r0, nb both 1.0, but we've had to deprecate r0 and might eventually deprecate nb
    • momentum has faltered on cortex-m and cortex-m-rt crates getting to 1.0
    • embedded-hal 1.0 has had a lot of interest and development
  • discussed perhaps pushing more crates towards 1.0 to reflect their current stability and widespread use
  • discussed cortex-m-rt's static mut transformation as a potential blocker on the way to releasing a 1.0
    • Perhaps the interrupt resource management can be turned into a separate crate?