Add chapter about DMA (with SPI) #81

	name: Book CI
	on:
	push:
	paths:
	- "book/"
	- "book/**"
	- ".github/workflows/book.yml"
	- "book"
	pull_request:
	paths:
	- "book/"
	- "book/**"
	- ".github/workflows/book.yml"
	- "book"

	env:
	MDBOOK_VERSION: "0.4.28"

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	permissions:
	contents: read
	steps:
	- name: Checkout the repository
	uses: actions/checkout@v4

	- name: Install Python dependencies
	run: \|
	pip3 install --user python-dateutil linkchecker
	- name: Put pip binary directory into path
	run: echo "~/.local/bin" >> $GITHUB_PATH

	- name: Download mdBook ${{ env.MDBOOK_VERSION }}
	run: \|
	mkdir -p /tmp/mdbook
	curl -Lo- https://github.com/rust-lang/mdBook/releases/download/v${{ env.MDBOOK_VERSION }}/mdbook-v${{ env.MDBOOK_VERSION }}-x86_64-unknown-linux-gnu.tar.gz \| tar -C /tmp/mdbook -xzv

	- name: Build the contents of the book
	run: /tmp/mdbook/mdbook build book/ -d /tmp/book

	- name: Check links
	run: linkchecker book

	- name: Upload GitHub Pages content
	uses: actions/upload-pages-artifact@v3
	with:
	path: /tmp/book

	deploy:
	name: Deploy
	runs-on: ubuntu-latest

	needs: [build]
	if: github.event_name == 'push' && github.ref == 'refs/heads/main'

	environment:
	name: github-pages
	url: ${{ steps.deployment.outputs.page_url }}
	permissions:
	contents: read
	pages: write
	id-token: write

	steps:
	- name: Deploy to GitHub Pages
	uses: actions/deploy-pages@v4
	id: deployment

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