[third_party/pigweed] Roll 3 commits

55b88ef80fc2403 pw_channel: Split open bits for read and write
be2ee681c2c0176 pw_async2: Add PendFuncTask
a9d379800be4ccd pw_allocator: Distinguish between requested, usabl

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: c59bb69e5e17000..55b88ef80fc2403
Roller-URL: https://ci.chromium.org/b/8752382544910045745
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Change-Id: I31878bbcc685b70361b902f7590215a72e40ebdc
Reviewed-on: https://pigweed-review.googlesource.com/c/example/echo/+/200151
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
1 file changed
tree: 991dd32d21eca5ede00c14046e9452aee51257c3
  1. src/
  2. targets/
  3. third_party/
  4. tools/
  5. .bazelrc
  6. .bazelversion
  7. .gitignore
  8. .gitmodules
  9. BUILD.bazel
  10. echo.bzl
  11. README.md
  12. requirements.in
  13. requirements_lock.txt
  14. WORKSPACE
README.md

Pigweed: minimal Bazel example

This repository contains a minimal example of a Bazel-based Pigweed project. It's an echo application for the STM32F429 Discovery Board.

Cloning

git clone --recursive https://pigweed.googlesource.com/example/echo

If you already cloned but forgot to include --recursive, run git submodule update --init to pull all submodules.

TODO: b/300695111 - Don't require submodules for this example.

Building

We‘ll assume you already have Bazel on your system. If you don’t, the recommended way to get it is through Bazelisk.

To build the entire project (including building the application for both the host and the STM32 Discovery Board), run

bazel build //...

To run the application locally on your machine, run,

bazel run //src:echo

Flashing

To flash the firmware to a STM32F429 Discovery Board connected to your machine, run,

bazel run //tools:flash

Note that you don't need to build the firmware first: Bazel knows that the firmware images are needed to flash the board, and will build them for you. And if you edit the source of the firmware or any of its dependencies, it will get rebuilt when you flash.

Communicating

Run,

bazel run //tools:miniterm -- /dev/ttyACM0 --filter=debug

to communicate with the board. When you transmit a character, you should get the same character back!