Rust ESP32 Community Meeting 2023-07-20

[jessebraham]

Please add topics and links to this discussion.

The meeting is scheduled for 20th July 2023 - 5 pm CEST/GMT+2 (a.k.a. Brno time) via Google Meet. The meeting invite is automatically sent to attendees of previous meetings. If you'd like to join, please notify us at https://matrix.to/#/#esp-rs-community-meetins:matrix.org

You can find information from the previous meeting at https://github.com/esp-rs/rust/discussions

If you find a topic exciting, click Arrow Icon or Emoji, and your vote will give the preference to the topic.

[georgik]

Rust Releases

• 1.71.0.1 - current release with LLVM 16 and GCC 12 - https://github.com/esp-rs/rust-build/releases/tag/v1.71.0.1
• 1.72.0.0 - scheduled official release with LLVM 16 and GCC 12 - around 26th August 2023

ESP-IDF Releases

• Recent: 5.1, 5.0.3, 4.2.5
• Rest of releases: 4.4.5, 4.3.5
• Phase out: 4.1 and older

Wokwi - Rust

• speed up of Rust no_std builders - https://wokwi.com/rust - average build went from 100 seconds to 2-3 seconds
• speed up of Rust std builders - e.g.: https://wokwi.com/projects/364819900028094465

Future Events

• Espressif DevCon 2023 - 12th-13th September - https://devcon.espressif.com/
• there will be also Rust talk ;-)

[jessebraham]

SVD

• Added interrupts and made various small corrections to ESP32-S2/S3 ULP coprocessor SVDs
• Created an SVD for the ESP32-C6's LP coprocessor
• Upstreamed patches from esp-pacs, published new SVDs for all chips
• Began working on an SVD for the ESP32-P4
  • Still very much in progress (lots of peripherals!)

ESP-PACS

• Create PACs for the ESP32-S2/S3's RISC-V ULP coprocessors esp-pacs#136
• Add a PAC for the ESP32-C6's LP coprocessor esp-pacs#137
• Rewrite the CI workflow esp-pacs#138
• Add latest SVDs and remove obsolete patches esp-pacs#140
• [esp32c6-lp] Make the LP_IO peripheral's registers match the TRM esp-pacs#142

ESP-HAL

• Derive the Clone and Copy traits for the Rng driver esp-hal#650
• Set merge=union git attribute for CHANGELOG.md esp-hal#651
• Remove the allow-opt-level-z feature from esp32c3-hal esp-hal#654
• Ensure that documentation can be generated for all packages in CI esp-hal#659
• Restructure files required during build process esp-hal#662

ESP32C6-LP-HAL

• Added input support to the GPIO driver
• Implemented additional output traits for the GPIO driver
• Implemented a driver for the LP_UART peripheral
  • Very close to working, configuration still isn't quite right...

ESPFLASH

• Version 2.0.1 espflash#446
  • https://crates.io/crates/cargo-espflash/2.0.1
  • https://crates.io/crates/espflash/2.0.1
• Begin next release cycle espflash#447

MISCELLANEOUS

• Create an xtask package to build the stubs and convert them to JSON esp-flasher-stub#18
• Include rust-analyzer-proc-macro-srv for all targets rust-build#223
• Set merge=union git attribute for CHANGELOG.md espflash#443

[JurajSadel]

DevCon23 demo

• we want to show some simple no_std, and async application with esp-wifi -> get data from a sensor and send them to MQTT over WiFi
• found a few interesting networking crates:
  • rust-mqtt both, std/no_std async APIs
  • reqwless no_std and no_alloc HTTP client -> I haven't really tried this one
• demo can be found at https://github.com/JurajSadel/esp32c3-no-std-async-mqtt-demo
  • async BMP180 basic driver is part of the demo

[MabezDev]

esp-hal

• Fix USB-SERIAL-JTAG on esp32s3 (along with a few others): esp32s3: usb-serial-jtag interrupt esp-hal#664
• Re-arrange some linker scripts, move the include of the segment alias' to linkall to allow overriding them: Move segment aliasing to linkall.x esp-hal#655

esp flasher stub

• Fix the stub: Fix the stub, FlashDeflateEnd was incorrectly sized esp-flasher-stub#21
• Add toml output for use in espflash: Add toml output for stubs esp-flasher-stub#23
• Huge refactor: 2023 updates, support the ESP32-C6 & ESP32-H2 esp-flasher-stub#25
  • Adds ESP32-C6 & ESP32H2 support
  • re-uses the linker scripts from esp-hal
  • Updates the stub to use the latest hals

probe-rs

• My simple profiler was merged: probe-rs: add a simple profiler probe-rs/probe-rs#1628

embedded-hal

Really nice to see embedded-io and friends moved into r-e/embedded-hal (see: rust-embedded/embedded-hal#466), submitted a PR to add some missing std impls: rust-embedded/embedded-hal#475

misc

• In my own time I've been working on a hard fork of https://github.com/rafalh/rust-fatfs with async support, will publish it soon hopefully, just need to test it on some hardware.

[bjoernQ]

SVD / PACS

• more aligned RMT peripheral
  • Further align RMT peripherals esp-pacs#139

esp-hal

• A new driver for RMT

  • Add a new RMT driver esp-hal#653
    • supports RX
    • should be easier to maintain and extend
    • should be easier to use
    • still things to do (interrupts, async)

• Fix USB device support

  • Update esp-synopsys-usb-otg esp-hal#656

• looked into ESP32: Some pins are not properly configured esp-hal#594

  • even with ESP-IDF I can't get I2C to work w/o external pull-ups on these pins

• Make in-progress DMA transfers potentially fallible

  • Make in-progress DMA transfers potentially fallible esp-hal#665

ESP32-C6 LP HAL

• started with some experimental code
  • https://github.com/bjoernQ/esp32c6lp-hal

esp-synopsys-usb-otg

• rebased our fork

• released 0.3.2

Matter

• updated / fixed the bare-metal Matter examples

  • only ipv6 and async branch

• updated https://github.com/bjoernQ/matter-rs-experiment/tree/async to use Ivan's "sequential-embassy-net" branch

  • much cleaner now

embassy-net

• fix dual-stack usage
  • Make dual-stack work in embassy-net embassy-rs/embassy#1668

Other

• small CLI tool - like readelf with visualization of ESP32 memory regions
  • https://github.com/bjoernQ/espsegs
  • still need to double check the memory regions and add support for more chips
  • code for drawing the bars is buggy currently

• seems like portable-atomics is causing problems with the way we tell the compiler about our atomic emulation

  • easy workaround is to use riscv32imac-unknown-none-elf

• update a few examples / demos / experiments

  • https://github.com/bjoernQ/esp32-rust-nostd-temperature-logger
  • https://github.com/bjoernQ/esp32s3-hid-example
  • https://github.com/bjoernQ/esp32c3-dhcp-experiment
  • https://github.com/bjoernQ/esp32-ulp-rust-macro
  • https://github.com/bjoernQ/esp32c3-ble-provisioning-experiment
  • https://github.com/bjoernQ/esp32c3-ota-experiment
  • https://github.com/bjoernQ/ps2keyboard-esp32c3

[Vollbrecht]

esp-idf-hal

• ongoing work on new async drivers by ivmarkov
  Async drivers esp-idf-hal#279
• added some more minor examples
  adds example for i2c between master and slave I2C on same device esp-idf-hal#274
  🚸 add simple timer example with task notify esp-idf-hal#277

esp-idf-svc

• also some examples around nvs storage contributed by punkto
  Add example that uses the C type of NVS API esp-idf-svc#274
  Add NVS usage example using the native Rust API esp-idf-svc#276

esp-idf-template

• revisit the old question if we should use the esp-idf "release/x" branch in the template or using only tagged versions as they are not "beta". It breaks every 3-4 month at least once.

[playfulFence]

esp-hal

• Implementing async feature for USB Serial/JTAG peripheral. esp-hal#632 is about to be merged, just a little polishing left
• Still working on and about to finish the module-level documentation for peripherals in esp-hal:

[tom-borcin]

Quarterly planning

• Rust Roadmap is available here: Q3.2023 Roadmap #181
• Q3.2023 Planned items are available here: https://github.com/orgs/esp-rs/projects/2/views/15

Planned items

High priority

1. Document all packages and peripherals esp-hal#29
2. Create a PAC for the ESP32-P4 esp-pacs#81
3. Add support for the RISC-V ULP esp-hal#377
4. Set up automated testing on hardware espflash#439

Medium priority

1. Implement async support for all applicable peripheral drivers esp-hal#361
2. Implement support for light-/deep-sleep esp-hal#375
3. Release first version on crates.io esp-wifi-sys#154
4. Initial release usable in other projects (e.g. esptool-js) esp-flasher-stub#17
5. Investigate/evaluate Add ble gatt server esp-idf-svc#247

Low priority

1. Clean-up esp-idf-based issues and PR’s