tangara-fw/BUILDING.md

Building and flashing

1. Make sure you've got all of the submodules in this repo correctly initialised:

git submodule update --init --recursive

2. If this is your first time setting up the repo, then you will need to install the ESP-IDF tools. You can consult the ESP-IDF docs for more detailed instructions, but the TL;DR is that you'll want to run something like this:

./lib/esp-idf/install.sh esp32

3. As a final piece of setup, you will need to source the env file in this repo to correctly set up your environment for building.

. ./.env

There is also a .env.fish for fish users.

4. You can now build the project using idf.py build. Or to flash the project onto your board, something like:

idf.py -p /dev/serial/by-id/usb-cool_tech_zone_Tangara_* -b 1000000 flash

(give or take the correct serial port)

Running tests

See TESTING.md for an overview of how to write and run our on-device test suite.

VSCode setup

When using the Espressif IDF extension, you may want to set the following in your settings.json file:

  "idf.espIdfPath": "${workspaceFolder}/lib/esp-idf",
  "idf.espIdfPathWin": "${workspaceFolder}/lib/esp-idf"

LSP (clangd) setup

A regular build will generate build/compile_commands.json, which clangd will automatically pick up. However, there are a couple of additional steps to get everything to play nicely.

First, create a .clangd file in the this directory, with contents like:

CompileFlags:
  Add: [
    -D__XTENSA__,
    --target=mipsel-linux-gnu,
  ]
  Remove: [
    -fno-tree-switch-conversion,
    -mlongcalls,
    -fstrict-volatile-bitfields,
  ]

You may need to tweak the target flag until clangd is happy to build.

If you get errors involving missing C++ includes, then you may need to edit your editor's LSP invocation to include --query-driver=**.

You should then get proper LSP integration via clangd.

ESP-IDF configuration

Espressif exposes a large collection of configuration options[1] for its framework; you can use idf.py menuconfig to generate a custom sdkconfig file, eg. to change the logging level.

To avoid needing to select the same set of options every time you regenerate the sdkconfig, you can also set some defaults in sdkconfig.local; this is not tracked in git, and is ideal for local / per-checkout changes.

1. https://docs.espressif.com/projects/esp-idf/en/release-v3.3/api-reference/kconfig.html