Add examples & Github Actions test for ESP-IDF.

This pull request adds two examples and tests using the ESP-IDF framework:

* A test with the Arduino GFX library (which requires the arduino-esp32 library & Arduino BusIO library)
* A test without the Arduino GFX library, which can be compiled without any additional dependencies.

Having these tests helps prevent any future regressions that may break users of the ESP-IDF platform.

2 files changed, 83 insertions, 0 deletions

diff --git a/.github/workflows/esp-idf_with-gfx.yml b/.github/workflows/esp-idf_with-gfx.yml
new file mode 100644
index 0000000..abe875b
--- /dev/null
+++ b/.github/workflows/esp-idf_with-gfx.yml
@@ -0,0 +1,49 @@
+name: esp-idf with Adafruit GFX Library
+
+on:
+  push:
+    paths-ignore:
+      - '**.md'
+      - 'doc/**'
+      - '.github/**'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+      - 'doc/**'
+      - '.github/**'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repo
+      uses: actions/checkout@v2
+      with:
+        submodules: 'recursive'
+    - name: Checkout ESP32-HUB75-MatrixPanel-I2S-DMA component
+      uses: actions/checkout@v2
+      with:
+        path: 'examples/esp-idf/with-gfx/components/ESP32-HUB75-MatrixPanel-I2S-DMA'
+    - name: Checkout Adafruit-GFX-Library repo
+      uses: actions/checkout@v2
+      with:
+        repository: 'adafruit/Adafruit-GFX-Library'
+        path: 'examples/esp-idf/with-gfx/components/Adafruit-GFX-Library'
+    - name: Checkout Adafruit_BusIO repo
+      uses: actions/checkout@v2
+      with:
+        repository: 'adafruit/Adafruit_BusIO'
+        path: 'examples/esp-idf/with-gfx/components/Adafruit_BusIO'
+    - name: Checkout arduino-esp32 repo
+      uses: actions/checkout@v2
+      with:
+        repository: 'espressif/arduino-esp32'
+        path: 'examples/esp-idf/with-gfx/components/arduino'
+    - name: esp-idf build
+      uses: espressif/esp-idf-ci-action@v1
+      with:
+        esp_idf_version: v4.4.4
+        target: esp32
+        path: 'examples/esp-idf/with-gfx'
diff --git a/.github/workflows/esp-idf_without-gfx.yml b/.github/workflows/esp-idf_without-gfx.yml
new file mode 100644
index 0000000..5fa06a4
--- /dev/null
+++ b/.github/workflows/esp-idf_without-gfx.yml
@@ -0,0 +1,34 @@
+name: esp-idf without Adafruit GFX Library
+
+on:
+  push:
+    paths-ignore:
+      - '**.md'
+      - 'doc/**'
+      - '.github/**'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+      - 'doc/**'
+      - '.github/**'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repo
+      uses: actions/checkout@v2
+      with:
+        submodules: 'recursive'
+    - name: Checkout ESP32-HUB75-MatrixPanel-I2S-DMA component
+      uses: actions/checkout@v2
+      with:
+        path: 'examples/esp-idf/without-gfx/components/ESP32-HUB75-MatrixPanel-I2S-DMA'
+    - name: esp-idf build
+      uses: espressif/esp-idf-ci-action@v1
+      with:
+        esp_idf_version: v4.4
+        target: esp32
+        path: 'examples/esp-idf/without-gfx'