Embedded Working Group Meeting 2021-07-20

• Coordination Repository
• Meetings: Tuesday 8pm Europe/Berlin time
• Join the Chat
• Today's date: 2021-07-20
• Nominated issues
• IRC logs

Attendance

Write your GH username or Matrix handle here!

• adamgreig
• therealprof
• eldruin
• cr1901
• GrantM11235
• thalesfragoso

Agenda

• Announcements
  • None this week
• embedded-hal
  • Invert layout of traits? https://github.com/rust-embedded/embedded-hal/pull/298
    • There was some worry that this would result in lots of copies of a module named blocking in scope due to e.g. use e_h::spi::blocking, but perhaps in practice users would either use e_h::spi and then bound T: spi::blocking::Write, or just use the trait directly.
    • This also allows shared items such as Errors to go into the top-level modules.
  • Associated Word types https://github.com/rust-embedded/embedded-hal/pull/295
    • Lots of discussion happening on the PR thread, so no further discussion in meeting this week.
  • Remove the various Default traits: https://github.com/rust-embedded/embedded-hal/pull/289
    • Consensus seems to be for removal.
  • Any other PRs?
• cortex-m
  • PR for 0.6.15 and 0.7.0: review from cortex-m team?
• showcase
  • Needs updating to use GHA, @adamgreig to do after meeting
• blog
  • Blocked on posting for help with cross maintainership, hopefully real soon now

Last Week's Minutes

• 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