[roll third_party/pigweed] pw_presubmit: Update buildifier invocation

Buildifier is removing some linter warnings (by merging them into the
default formatting process), see
https://github.com/bazelbuild/buildtools/pull/1244. This change will
prevent a breakage from occurring when we roll a buildifier update that
contains this PR.

Internally see also g/copybara-users/c/Jkgv3DH-lyk

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/200350

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 917b5b7db5b6bba..15303ba92faa0dd
Roller-URL: https://ci.chromium.org/b/8752243179647794689
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0d408a0e3d9a021c5598a163a46382ce315675d3
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/200688
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
1 file changed
tree: 32dd886aded772c3c248e8f500f70a8f2705f9b5
  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/pigweed/quickstart/bazel

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!