ci(lcd_qemu_rgb_panel): test example in CI

Author: igrr

Diff for: .github/test_requirements.txt

@@ -0,0 +1,10 @@
+# Generic requirements for all tests
+pytest-embedded==1.11.7
+pytest-embedded-serial-esp==1.11.7
+pytest-embedded-idf==1.11.7
+pytest-embedded-qemu==1.11.7
+pytest-custom_exit_code==0.3.0
+
+# Test-specific requirements
+cryptography==43.0.3
+pillow==10.3.0

Diff for: .github/workflows/build_and_run_apps.yml

@@ -72,10 +72,10 @@ jobs:
       fail-fast: false
       matrix:
         idf_ver: 
-          - "release-v5.0"
-          - "release-v5.1"
-          - "release-v5.2"
-          - "release-v5.3"
+          # - "release-v5.0"
+          # - "release-v5.1"
+          # - "release-v5.2"
+          # - "release-v5.3"
           - "latest"
         parallel_index: [1,2,3,4,5] # Update --parallel-count below when changing this
     runs-on: ubuntu-22.04
@@ -122,27 +122,30 @@ jobs:
       fail-fast: false
       matrix:
         idf_ver:
-          - "release-v5.0"
-          - "release-v5.1"
-          - "release-v5.2"
-          - "release-v5.3"
+          # - "release-v5.0"
+          # - "release-v5.1"
+          # - "release-v5.2"
+          # - "release-v5.3"
           - "latest"
         runner:
-          - runs-on: "esp32"
+          - runs-on: '["self-hosted", "linux", "docker", "esp32"]'
             marker: "generic"
             target: "esp32"
-          - runs-on: "ESP32-ETHERNET-KIT"
+          - runs-on: '["self-hosted", "linux", "docker", "ESP32-ETHERNET-KIT"]'
             marker: "ethernet"
             target: "esp32"
-          - runs-on: "spi_nand_flash"
+          - runs-on: '["self-hosted", "linux", "docker", "spi_nand_flash"]'
             marker: "spi_nand_flash"
             target: "esp32"
+          - runs-on: '["ubuntu-22.04"]'
+            marker: "qemu"
+            target: "esp32"
     env:
       TEST_RESULT_NAME: test_results_${{ matrix.runner.target }}_${{ matrix.runner.marker }}_${{ matrix.idf_ver }}
       TEST_RESULT_FILE: test_results_${{ matrix.runner.target }}_${{ matrix.runner.marker }}_${{ matrix.idf_ver }}.xml
-    runs-on: [self-hosted, linux, docker, "${{ matrix.runner.runs-on }}"]
+    runs-on: ${{ fromjson(matrix.runner.runs-on) }}
     container:
-      image: python:3.11-bookworm
+      image: 'python:3.11-bookworm'
       options: --privileged # Privileged mode has access to serial ports
     steps:
       - uses: actions/checkout@v4
@@ -153,7 +156,17 @@ jobs:
       - name: Install Python packages
         env:
           PIP_EXTRA_INDEX_URL: "https://dl.espressif.com/pypi/"
-        run: pip install --prefer-binary cryptography pytest-embedded pytest-embedded-serial-esp pytest-embedded-idf pytest-custom_exit_code
+        run: python3 -m pip install --prefer-binary -r .github/test_requirements.txt
+      - name: Install QEMU
+        if: matrix.runner.marker == 'qemu'
+        env:
+          QEMU_VERSION: "esp-develop-9.0.0-20240606"
+          QEMU_ARCHIVE: "qemu-xtensa-softmmu-esp_develop_9.0.0_20240606-x86_64-linux-gnu.tar.xz"
+        run: |
+          curl -sSL -o ${QEMU_ARCHIVE} https://github.com/espressif/qemu/releases/download/${QEMU_VERSION}/${QEMU_ARCHIVE}
+          tar -xf ${QEMU_ARCHIVE}
+          rm ${QEMU_ARCHIVE}
+          echo "PATH=$PWD/qemu/bin" >> $GITHUB_PATH
       - name: Run apps
         run: |
           python3 .github/get_pytest_args.py --target=${{ matrix.runner.target }} -v 'build_info*.json' pytest-args.txt

Diff for: esp_lcd_qemu_rgb/examples/lcd_qemu_rgb_panel/README.md

@@ -16,9 +16,12 @@ By default, the example will use the target internal RAM as the frame buffer. To
 
 ### Build and run
 
-To build the example, run `idf.py build` command.
+To build and run the example, run:
+```shell
+idf.py qemu -g monitor
+```
 
-Please refer to the [QEMU Guide](https://github.com/espressif/esp-toolchain-docs/blob/main/qemu/README.md) for the detailed steps to setup and run the image.
+Please refer to the [QEMU Guide](https://github.com/espressif/esp-toolchain-docs/blob/main/qemu/README.md) for more information on installing and running QEMU.
 
 ## Example Output
 
@@ -34,3 +37,6 @@ I (55) example: Starting LVGL task
 I (65) example: Display LVGL Scatter Chart
 I (75) main_task: Returned from app_main()
 ```
+
+The following image should be displayed:
+![](doc/scatter_chart.png)

Diff for: esp_lcd_qemu_rgb/examples/lcd_qemu_rgb_panel/doc/scatter_chart.png

@@ -6,4 +6,11 @@ menu "Example Configuration"
         help
             Use QEMU RGB panel dedicated framebuffer as the framebuffer for LVGL.
 
+    config EXAMPLE_QEMU_RGB_PANEL_STATIC
+        bool "Static UI (for testing)"
+        default "n"
+        help
+            If this option is enabled, example will not update the chart after
+            it was drawn. This option is used in CI when testing the example.
+
 endmenu

Diff for: esp_lcd_qemu_rgb/examples/lcd_qemu_rgb_panel/main/Kconfig.projbuild

@@ -173,4 +173,6 @@ void app_main(void)
         // Release the mutex
         example_lvgl_unlock();
     }
+
+    ESP_LOGI(TAG, "LVGL Scatter Chart displayed");
 }

Diff for: esp_lcd_qemu_rgb/examples/lcd_qemu_rgb_panel/main/lcd_qemu_rgb_panel_main.c

@@ -34,11 +34,13 @@ static void draw_event_cb(lv_event_t *e)
     }
 }
 
+#ifndef CONFIG_EXAMPLE_QEMU_RGB_PANEL_STATIC
 static void add_data(lv_timer_t *timer)
 {
     lv_obj_t *chart = timer->user_data;
     lv_chart_set_next_value2(chart, lv_chart_get_series_next(chart, NULL), lv_rand(0, 200), lv_rand(0, 1000));
 }
+#endif //CONFIG_EXAMPLE_QEMU_RGB_PANEL_STATIC
 
 void example_lvgl_demo_ui(lv_disp_t *disp)
 {
@@ -64,5 +66,7 @@ void example_lvgl_demo_ui(lv_disp_t *disp)
         lv_chart_set_next_value2(chart, ser, lv_rand(0, 200), lv_rand(0, 1000));
     }
 
+#ifndef CONFIG_EXAMPLE_QEMU_RGB_PANEL_STATIC
     lv_timer_create(add_data, 100, chart);
+#endif
 }

Diff for: esp_lcd_qemu_rgb/examples/lcd_qemu_rgb_panel/main/lvgl_demo_ui.c

@@ -0,0 +1,31 @@
+# SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+
+import pytest
+import os
+from pytest_embedded import Dut
+import time
+try:
+    from PIL import Image
+    from PIL import ImageChops
+except ImportError:
+    Image = None
+
+@pytest.mark.qemu
+@pytest.mark.parametrize('qemu_extra_args', ['-display sdl'])
+@pytest.mark.parametrize('embedded_services', ['idf,qemu'])
+def test_qemu_rgb_panel(dut: Dut) -> None:
+    if not Image:
+        pytest.fail('Pillow is not installed')
+
+    dut.expect_exact('Install RGB LCD panel driver')
+    dut.expect_exact('LVGL Scatter Chart displayed')
+    time.sleep(2)
+    filename = 'scatter_chart.ppm'
+    dut.qemu.take_screenshot(filename)
+
+    img = Image.open(filename)
+    ref_img = Image.open(os.path.join(os.path.dirname(__file__), 'doc', 'scatter_chart.png'))
+    
+    diff = ImageChops.difference(img, ref_img)
+    assert not diff.getbbox(), 'Images are different'

Diff for: esp_lcd_qemu_rgb/examples/lcd_qemu_rgb_panel/pytest_lcd_qemu_rgb_panel.py

@@ -0,0 +1 @@
+CONFIG_EXAMPLE_QEMU_RGB_PANEL_STATIC=y

Diff for: esp_lcd_qemu_rgb/examples/lcd_qemu_rgb_panel/sdkconfig.ci

@@ -13,6 +13,7 @@ markers =
   generic: generic runner
   ethernet: ethernet runners
   spi_nand_flash: runner with SPI NAND flash connected
+  qemu: test runs in QEMU emulator
 
 # log related
 log_cli = True