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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
+# and https://github.com/JF002/Pinetime/blob/master/bootloader/README.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:
+
+      #########################################################################################
+      # Download and Cache Dependencies
+
+      - 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-9-2020-q2
+        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: 9-2020-q2
+          # 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: Check cache for MCUBoot
+        id:   cache-mcuboot
+        uses: actions/cache@v2
+        env:
+          cache-name: cache-mcuboot
+        with:
+          path: ${{ runner.temp }}/mcuboot
+          key:  ${{ runner.os }}-build-${{ env.cache-name }}
+          restore-keys: ${{ runner.os }}-build-${{ env.cache-name }}
+
+      - name: Install MCUBoot
+        if:   steps.cache-mcuboot.outputs.cache-hit != 'true'  # Install MCUBoot if not found in cache
+        run:  |
+          cd ${{ runner.temp }}
+          git clone --branch v1.5.0 https://github.com/JuulLabs-OSS/mcuboot
+
+      - name: Install imgtool dependencies
+        run:  pip3 install --user -r ${{ runner.temp }}/mcuboot/scripts/requirements.txt
+
+      - name: Install adafruit-nrfutil
+        run:  |
+          pip3 install --user wheel
+          pip3 install --user setuptools
+          pip3 install --user adafruit-nrfutil
+
+        #########################################################################################
+        # Checkout
+
+      - name: Checkout source files
+        uses: actions/checkout@v2
+
+      - name: Show files
+        run:  set ; pwd ; ls -l
+
+      #########################################################################################
+      # CMake
+
+      - name: CMake
+        run:  |
+          mkdir -p build
+          cd build
+          cmake -DARM_NONE_EABI_TOOLCHAIN_PATH=${{ runner.temp }}/arm-none-eabi -DNRF5_SDK_PATH=${{ runner.temp }}/nrf5_sdk -DUSE_OPENOCD=1 ../
+
+        #########################################################################################
+        # Make and Upload DFU Package
+        # pinetime-mcuboot-app.img must be flashed at address 0x8000 in the internal flash memory with OpenOCD:
+        # program image.bin 0x8000
+
+        # For Debugging Builds: Remove "make" option "-j" for clearer output. Add "--trace" to see details.
+        # For Faster Builds: Add "make" option "-j"
+
+      - name: Make pinetime-mcuboot-app
+        run:  |
+          cd build
+          make pinetime-mcuboot-app
+
+      - name: Create firmware image
+        run:  |
+          # The generated firmware binary looks like "pinetime-mcuboot-app-0.8.2.bin"
+          ls -l build/src/pinetime-mcuboot-app*.bin
+          ${{ runner.temp }}/mcuboot/scripts/imgtool.py create --align 4 --version 1.0.0 --header-size 32 --slot-size 475136 --pad-header build/src/pinetime-mcuboot-app*.bin build/src/pinetime-mcuboot-app-img.bin
+          ${{ runner.temp }}/mcuboot/scripts/imgtool.py verify build/src/pinetime-mcuboot-app-img.bin
+
+      - name: Create DFU package
+        run:  |
+          ~/.local/bin/adafruit-nrfutil dfu genpkg --dev-type 0x0052 --application build/src/pinetime-mcuboot-app-img.bin build/src/pinetime-mcuboot-app-dfu.zip
+          unzip -v build/src/pinetime-mcuboot-app-dfu.zip
+          # Unzip the package because Upload Artifact will zip up the files
+          unzip build/src/pinetime-mcuboot-app-dfu.zip -d build/src/pinetime-mcuboot-app-dfu
+
+      - name: Upload DFU package
+        uses: actions/upload-artifact@v2
+        with:
+          name: pinetime-mcuboot-app-dfu.zip
+          path: build/src/pinetime-mcuboot-app-dfu/*
+
+        #########################################################################################
+        # Make and Upload Standalone Firmware
+
+      - name: Make pinetime-app
+        run:  |
+          cd build
+          make pinetime-app
+
+      - name: Upload standalone firmware
+        uses: actions/upload-artifact@v2
+        with:
+          name: pinetime-app.out
+          path: build/src/pinetime-app*.out
+
+      #########################################################################################
+      # Finish
+
+      - name: Find output
+        run:  |
+          find . -name "pinetime-app.*" -ls
+          find . -name "pinetime-mcuboot-app.*" -ls
+
+# 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.
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