diff --git a/.github/workflows/build-mbed.yml b/.github/workflows/build-mbed.yml
index 5b192d3..658e8a4 100644
--- a/.github/workflows/build-mbed.yml
+++ b/.github/workflows/build-mbed.yml
@@ -12,16 +12,14 @@ jobs:
       runs-on: ubuntu-latest
       container: mbedos/mbed-os-env:latest
       steps:
-        - name: Checkout
+        - name: Checkout sources
           uses: actions/checkout@v2
 
-        - name: Install dependencies
+        - name: Build for mbed
           run: |
             cd mbed
-            pip install --upgrade mbed-cli mbed-tools
+            pip install --upgrade --user mbed-cli mbed-tools
             mbed deploy
-
-        - name: Build
-          run: |
-            cmake -S mbed -B cmake_build -GNinja -DCMAKE_BUILD_TYPE=Debug
-            cmake --build cmake_build
+            mbed-tools configure -t GCC_ARM -m NRF52840_DK
+            cmake -S . -B cmake_build/NRF52840_DK/develop/GCC_ARM -GNinja -DCMAKE_BUILD_TYPE=Debug
+            cmake --build cmake_build/NRF52840_DK/develop/GCC_ARM
diff --git a/.github/workflows/build-zephyr.yml b/.github/workflows/build-zephyr.yml
new file mode 100644
index 0000000..9528656
--- /dev/null
+++ b/.github/workflows/build-zephyr.yml
@@ -0,0 +1,45 @@
+name: Build for zephyr
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  build:
+      name: Build for zephyr
+      runs-on: ubuntu-latest
+      container: zephyrprojectrtos/zephyr-build:latest
+      steps:
+        - name: Get zephyr
+          run: |
+            sudo mkdir -p /workdir/zephyr
+            cd /workdir/zephyr
+            sudo west init
+            sudo west update
+
+        # Workaround for GitHub permission issues.
+        - name: Grant global rwx permission
+          run: |
+            sudo chmod 777 -R /workdir || true
+            sudo chmod 777 -R /github || true
+            sudo chmod 777 -R /home || true
+            sudo chmod 777 -R /__w || true
+
+        - name: Checkout sources
+          uses: actions/checkout@v2
+
+        - name: Build for zephyr
+          run: |
+            sudo chmod 777 -R /workdir || true
+            sudo chmod 777 -R /github || true
+            sudo chmod 777 -R /home || true
+            sudo chmod 777 -R /__w || true
+            mkdir -p zephyr/BUILD
+            cd zephyr/BUILD
+            export ZEPHYR_BASE="/workdir/zephyr/zephyr"
+            export Zephyr_Dir="/workdir/zephyr/zephyr"
+            export CMAKE_PREFIX_PATH="/workdir/zephyr/zephyr"
+            cmake -DBOARD=nrf52840dk_nrf52840 -GNinja ..
+            cmake --build .