feat(uart): baud rate calculation #77

	name: Test Pi Pico SDK
	on:
	push:
	pull_request:
	branches: [main]
	jobs:
	test-pico-sdk:
	name: Test Pi Pico SDK
	runs-on: ubuntu-latest
	strategy:
	matrix:
	sdk_version: [1.2.0, 1.3.1, 1.4.0]
	steps:
	- uses: actions/checkout@v3
	- name: Cache Pico SDK
	id: cache-pico-sdk
	uses: actions/cache@v3
	with:
	path: ~/pico
	key: ${{ runner.os }}-pico-sdk-${{ matrix.sdk_version }}
	- name: Set up the toolchain
	if: steps.cache-pico-sdk.outputs.cache-hit != 'true'
	run: \|
	sudo apt-get update
	sudo apt-get install -y cmake gcc-arm-none-eabi libnewlib-arm-none-eabi build-essential
	- name: Set up the Pi Pico SDK and examples
	if: steps.cache-pico-sdk.outputs.cache-hit != 'true'
	run: \|
	mkdir ~/pico
	cd ~/pico
	git clone https://github.com/raspberrypi/pico-sdk.git --depth 1 --branch ${SDK_VERSION}
	cd pico-sdk && git submodule update --init && cd ..
	git clone https://github.com/raspberrypi/pico-examples.git --depth 1 --branch "sdk-${SDK_VERSION}"
	cd pico-examples && mkdir build && cd build && cmake .. && make -j4
	env:
	SDK_VERSION: ${{ matrix.sdk_version }}
	PICO_SDK_PATH: ~/pico/pico-sdk
	- name: Install NPM packages
	run: npm ci
	- name: Test "Hello World" example
	run: timeout 10 npm run start:micropython -- --image ~/pico/pico-examples/build/hello_world/usb/hello_usb.uf2 --expect-text "Hello, world!"

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