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.github/workflows/main2.yml

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+# GitHub Actions Workflow to build FreeRTOS Firmware for PineTime Smart Watch
+# See https://lupyuen.github.io/pinetime-rust-mynewt/articles/cloud
+# Based on https://github.com/JF002/Pinetime/blob/master/doc/buildAndProgram.md
+
+# Name of this Workflow
+name: Build PineTime Firmware
+
+# When to run this Workflow...
+on:
+
+  # Run this Workflow when files are updated (Pushed) in the "master" Branch
+  push:
+    branches: [ master ]
+    
+  # Also run this Workflow when a Pull Request is created or updated in the "master" Branch
+  pull_request:
+    branches: [ master ]
+
+# Steps to run for the Workflow
+jobs:
+  build:
+
+    # Run these steps on Ubuntu
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Install cmake
+      uses: lukka/get-cmake@v3.18.0
+
+    - name: Check cache for Embedded Arm Toolchain arm-none-eabi-gcc
+      id:   cache-toolchain
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-toolchain
+      with:
+        path: ${{ runner.temp }}/arm-none-eabi
+        key:  ${{ runner.os }}-build-${{ env.cache-name }}
+        restore-keys: ${{ runner.os }}-build-${{ env.cache-name }}
+
+    - name: Install Embedded Arm Toolchain arm-none-eabi-gcc
+      if:   steps.cache-toolchain.outputs.cache-hit != 'true'  # Install toolchain if not found in cache
+      uses: fiam/arm-none-eabi-gcc@v1.0.2
+      with:
+        # GNU Embedded Toolchain for Arm release name, in the V-YYYY-qZ format (e.g. "9-2019-q4")
+        release: 8-2019-q3
+        # Directory to unpack GCC to. Defaults to a temporary directory.
+        directory: ${{ runner.temp }}/arm-none-eabi
+
+    - name: Check cache for nRF5 SDK
+      id:   cache-nrf5sdk
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-nrf5sdk
+      with:
+        path: ${{ runner.temp }}/nrf5_sdk
+        key:  ${{ runner.os }}-build-${{ env.cache-name }}
+        restore-keys: ${{ runner.os }}-build-${{ env.cache-name }}
+          
+    - name: Install nRF5 SDK
+      if:   steps.cache-nrf5sdk.outputs.cache-hit != 'true'  # Install SDK if not found in cache
+      run:  cd ${{ runner.temp }} && curl https://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v15.x.x/nRF5_SDK_15.3.0_59ac345.zip -o nrf5_sdk.zip && unzip nrf5_sdk.zip && mv nRF5_SDK_15.3.0_59ac345 nrf5_sdk
+
+    - name: Checkout source files
+      uses: actions/checkout@v2
+
+    - name: Show files
+      run:  set ; pwd ; ls -l
+
+    - name: CMake
+      run:  mkdir -p build && cd build && cmake -DARM_NONE_EABI_TOOLCHAIN_PATH=${{ runner.temp }}/arm-none-eabi -DNRF5_SDK_PATH=${{ runner.temp }}/nrf5_sdk -DUSE_OPENOCD=1 ../
+      
+    - name: Make pinetime-app
+      # For Debugging Builds: Remove "make" option "-j" for clearer output. Add "--trace" to see details.
+      # For Faster Builds: Add "make" option "-j"
+      run:  cd build && make pinetime-app
+
+    - name: Make pinetime-mcuboot-app
+      run:  cd build && make pinetime-mcuboot-app
+
+    - name: Find output
+      run:  find . -name "pinetime-app.*" -ls ; find . -name "pinetime-mcuboot-app.*" -ls
+      
+    - name: Upload built firmware pinetime-app
+      uses: actions/upload-artifact@v2
+      with:
+        # Artifact name (optional)
+        name: pinetime-app.out
+        # A file, directory or wildcard pattern that describes what to upload
+        path: build/src/pinetime-app.out
+
+    - name: Upload built firmware pinetime-mcuboot-app
+      uses: actions/upload-artifact@v2
+      with:
+        # Artifact name (optional)
+        name: pinetime-mcuboot-app.bin
+        # A file, directory or wildcard pattern that describes what to upload
+        path: build/src/pinetime-mcuboot-app.bin
+
+# Embedded Arm Toolchain and nRF5 SDK will only be cached if the build succeeds.
+# So make sure that the first build always succeeds, e.g. comment out the "Make" step.