Rust ESP32 Community Meeting 2022-08-23

[georgik]

Please add topics and links to this discussion.

The meeting is scheduled for 23th August 2022 - 8 pm CEST/GMT+2 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 Toolchain 1.63.0.0

• https://github.com/esp-rs/rust-build/releases/tag/v1.63.0.0
• updated Windows installer to support both GNU and MSVC with full boostrap of the environment: https://github.com/espressif/idf-installer/releases/tag/online-2.16
  • using idf-env cli: https://github.com/espressif/idf-env#working-with-rust-language-for-xtensa

idf-env rust install --default-host x86_64-pc-windows-gnu --extra-tools=mingw --extra-crates="ldproxy"`
idf-env rust install --default-host x86_64-pc-windows-msvc --extral-tools=vctools

Rust Toolchain 1.63.0.1

• https://github.com/esp-rs/rust-build/releases/tag/v1.63.0.1
• Solved issues https://github.com/esp-rs/rust-build/milestone/7?closed=1
• Rust ABI implementation Fix the Rust ABI implementation #18
• Ubuntu 22 support Ubuntu 22.04 is using openSSL 3.0 as default  rust-build#68

Documentation of build process

• https://github.com/esp-rs/rust-build/wiki/Build-and-release-process

Talks about Rust and Workshop

• 17th - 18th September - OpenAlt 2022 conference - Brno - https://www.openalt.cz/2022/

Experiments

• using rand_chacha - working with bare metal getrandom::register_custom_getrandom; - whole example - still work in progress

[jessebraham]

ESP-PACS + ESP-HAL

• Published new versions of esp32, esp32c3, esp32s2, and esp32s3 crates
• Change esp-hal to use published PACs
  • Use the published version of the PACs esp-hal#157
  • No longer alias the PAC package names esp-hal#163

ESPFLASH

• Add support for custom partition table types and sub-types to espflash
  • Add support for custom partition types and sub-types espflash#220
• Pushed cargo-espflash and espflash CLI redesign work to a repo
  • Still in-progress, but mostly complete I think
  • Lots of minutiae to obsess over still
  • https://github.com/jessebraham/espflash-cli-resdesign

ESP-BACKTRACE

• Published the first 2 versions of esp-backtrace
  • Prepare for first release esp-backtrace#3
  • lib: Pretty-print PanicInfo esp-backtrace#5
  • Add a CI workflow to check (as extensively as possible) various feature combinations esp-backtrace#6
  • https://crates.io/crates/esp-backtrace

XTENSA-TOOLCHAIN

• Updates to the xtensa-toolchain action:
  • Download installation script to $HOME to allow for publishing crates in CI
  • Use the installation script from a release instead of the main branch xtensa-toolchain#9
• Draft PR opened to download installation script from release
  • Use the installation script from a release instead of the main branch xtensa-toolchain#9

REPO-ACTIVITY-DIGEST

• Created the repo-activity-digest repository, which generates HTML activity digests for our repositories daily at midnight UTC
  • https://esp-rs.github.io/repo-activity-digest/
  • https://esp-rs.github.io/repo-activity-digest/esp-hal.html

MISCELLANEOUS

• Bumped dependencies and fixed build errors for various projects:
  • Update xtensa-lx-rt to latest version xtensa-atomic-emulation-trap#4
  • Bump riscv-rt dependency and pin esp-hal to a git commit esp-template#20
  • Use the published version of esp-backtrace esp-template#22
• Reviewed and merged a number of PRs in various repositories:
  • rtc: Add support for monitoring of XTAL clock esp-hal#146
  • common/gpio: Allow disconnecting IO from peripheral esp-hal#147
  • ESP32[-C3]: Fix broken references in documentation esp-hal#153
  • ESP32-S2: Fix broken reference in documentation esp-hal#154
  • Fix change detection of linker script on build files esp-hal#155
  • ESP32-S2: Fix stack area overlapping with ROM data reserved region esp-hal#159
  • enable support for loader stubs (via --use-stub arg) espflash#216
  • Fix sync behavior espflash#217
  • bugfix: Don't use canonicalized strings on Windows espflash#218

[JurajSadel]

espflash

• chip as an argument didn't work on Windows: bugfix: Don't use canonicalized strings on Windows espflash#218

wrover-demo

• started "porting" to bare-metal
• SPI display works
• WiFi works
• HTTPS (TLS) missing on bare metal -> blocker
• build issues with SNTP

esp-serial-dbg

• tested examples
• breakpoints in the main loop work
• breakpoints in the main loop AND in RAM code work
• breakpoints ONLY in RAM code don't work, the code only pauses once on the breakpoint in RAM code
• currently trying to find out what is going on, it looks like there is an issue with interrupts in RAM code

[bjoernQ]

esp-hal

• improve ESP32-S3 linker script
  • the ticket links a potential bug but the linker script already took care of that
  • however we were wasting 32k of RAM ... so I fixed that
  • Optimize the ESP32-S3 linker script esp-hal#164
• fix ESP32-S2 linker script
  • Fix IRAM/DRAM overlap for ESP32-S2 esp-hal#161
• fix ESP32-C3 builds on latest nightlies
  • Fix ESP32-C3 builds on latest nightlies esp-hal#148

esp-println

• don't enable TX interrupt (which was enabled for no reason)
  • Don't enable TX-INTERRUPT on ESP32-S2 esp-println#10
• release 0.2.2

esp-serial-dbg

• https://github.com/bjoernQ/esp-serial-dbg
• debugging bare-metal code with nothing but a UART connection
• debugging via command line GDB or VSCode
• still some bugs and things to improve
• some things were easier than expected - others much harder
• generally already works
  • there are technical limitations compared to JTAG debugging obviously
  • still more useful than expected
• future ideas
  • our own VSCode extension
  • support Microsoft DAP
  • some other ideas what we could do with that ...

esp-storage

• https://github.com/bjoernQ/esp-storage
• fully implements embedded-storage traits
• works on ESP32, ESP32-C3, ESP32-S3
• NOT YET works on ESP32-S2
• Q: Move to esp-rs or wait until ESP32-S2 is supported?

esp-book

• removed links to obsolete esp32-hal / esp32-wifi
• replaced with links to esp-hal and esp-wifi
• mention lates archievements with esp-wifi

puny-tls

• no-std / no-alloc TLS 1.3 client that actually is able to connect to real world servers
  - io.adafruit.com:8883
  - www.google.com
  - www.google.de
  - www.bahn.de
  - www.cloudflare.com
  - aws.amazon.com
  - www.microsoft.com
  - tls13.akamai.io
  - ...
• implements embedded-io traits
• only supports one cipher - but that one is commonly supported by servers
• NOT intended for production however
  • doesn't verify the server certificates, yet
• there is even an example using it on ESP32-C3
  • https://github.com/bjoernQ/puny-tls-esp32c3-demo

[MabezDev]

esp-hal

• critical_section implementations & esp_backtrace esp-hal#151
• include bss size when calculating rwtext address esp-hal#145
• Now that the CS implementation is merged, my next goal is to continue with embassy/async support

esp-template

• cargo: Add rustflag to force frame pointers esp-template#23

esp-idf-hal

• V5 ESP32 Hall Sensor unsupported esp-idf-hal#118
• V5/read hall unsupported extension esp-idf-hal#121

compiler

• Fixed up the Xtensa ABI implementation: Fix the Rust ABI implementation #18
  • https://github.com/MabezDev/esp-rustc-abi-bug/ demo repo
• Suspected miscompilation using 1.63.0.0 #134

probe-rs

• Debug: Improvements to halt locations used by breakpoints and stepping. probe-rs/probe-rs#1156 More RISC-V improvements

[jessebraham]

From @N3xed, posted in last week's discussion by mistake:
#131 (comment)

[N3xed]

From @N3xed, posted in last week's discussion by mistake: #131 (comment)

Oops.
Offline updates, since I won't be there.

esp-idf-sys

• Make esp-idf master compile (with deprecation warnings) (esp-rs/esp-idf-sys@8a0e928 and esp-rs/esp-idf-sys@1358ea7)
  • The esp-idf-sys/embuild issue where it wants to install the python venv even though there is an activated esp-idf environment (if $ESP_IDF_TOOLS_INSTALL_DIR is unset) still happens (Build with ESP-IDF 5.0 / master (2022-05-26) fails esp-idf-sys#99 (comment)), needs some more investigation.
  • Issue for Windows CMake Error: Could not create symbolic link for... (IDFGH-7188) espressif/esp-idf#8787 where compiling the esp-idf across drives doesn't work.
    • Made upstream PR: Copy files instead of hard-linking on Windows Mbed-TLS/mbedtls#6188
• esp-rs/esp-idf-sys@bd6f357: Show the caller when panicking in EspError::panic.

misc

• fix: Fix panics on GATs involving const generics rust-lang/rust-analyzer#13021
  Using any of the esp_idf_svc::executor::asynch::isr::* made rust analyzer crash constantly, this PR fixes that.

[georgik]

Next meeting: 6th September at 3 pm (GMT+2) Brno time