add firmware workflow for gh actions

.github/workflows/cmake.yml

@@ -0,0 +1,78 @@
+# https://github.com/raspberrypi/pico-examples/blob/master/.github/workflows/cmake.yml
+
+name: Firmware
+
+# build for each push and pull request
+on: [push, pull_request]
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    steps:
+      - name: Install dependencies
+        run: sudo apt-get install -y cxxtest build-essential gcc-arm-none-eabi mtools zip
+
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          path: repo
+          fetch-depth: 0
+
+      - name: Checkout repo submodules
+        working-directory: ${{github.workspace}}/repo
+        run: git submodule update --init
+
+      - name: Checkout pico-sdk submodules
+        working-directory: ${{github.workspace}}/repo/pico-sdk
+        run: git submodule update --init
+
+      - name: Create Build Environment
+        working-directory: ${{github.workspace}}/repo
+        run:  cmake -E make_directory ${{github.workspace}}/repo/build
+
+      - name: Configure CMake
+        shell: bash
+        working-directory: ${{github.workspace}}/repo/build
+        run: cmake .. -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+
+      - name: Get core count
+        id: core_count
+        run : cat /proc/cpuinfo  | grep processor | wc -l
+
+      - name: Build
+        working-directory: ${{github.workspace}}/repo/build
+        shell: bash
+        run: cmake --build . --config $BUILD_TYPE --parallel $(nproc)
+
+      - name: Upload a Build Artifact
+        uses: actions/upload-artifact@v4.0.0
+        with:
+          name: firmware.uf2
+          path: ${{github.workspace}}/repo/build/drumkit.uf2
+          if-no-files-found: error
+
+      - name: Upload a Build Artifact
+        uses: actions/upload-artifact@v4.0.0
+        with:
+          name: update.elf
+          path: ${{github.workspace}}/repo/build/drumkit.elf
+          if-no-files-found: error
+
+      - name: Archive release files
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          cd ${{github.workspace}}/repo/build
+          zip -r firmware drumkit.uf2 drumkit.elf
+
+      - name: Upload release files
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v1
+        with:
+          files: ${{github.workspace}}/repo/build/firmware.zip

README.md

@@ -3,6 +3,7 @@
 ![PCB](https://github.com/xythobuz/lars/actions/workflows/kicad.yml/badge.svg)
 ![Docs](https://github.com/xythobuz/lars/actions/workflows/docs.yml/badge.svg)
 ![STLs](https://github.com/xythobuz/lars/actions/workflows/scad.yml/badge.svg)
+![Firmware](https://github.com/xythobuz/lars/actions/workflows/cmake.yml/badge.svg)
 
 This is a simple drum machine / loopstation.
 It's made for three hand-wound solenoids mounted to a tambourine.

docs/src/introduction.md

@@ -3,6 +3,7 @@
 ![PCB](https://github.com/xythobuz/lars/actions/workflows/kicad.yml/badge.svg)
 ![Docs](https://github.com/xythobuz/lars/actions/workflows/docs.yml/badge.svg)
 ![STLs](https://github.com/xythobuz/lars/actions/workflows/scad.yml/badge.svg)
+![Firmware](https://github.com/xythobuz/lars/actions/workflows/cmake.yml/badge.svg)
 
 This is a simple drum machine / loopstation.
 It's made for three hand-wound solenoids mounted to a tambourine.