rgb_lcd: support yuv converter

components/esp_lcd/test_apps/rgb_lcd/CMakeLists.txt

@@ -4,6 +4,9 @@ cmake_minimum_required(VERSION 3.16)
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(rgb_lcd_panel_test)
 
+target_add_binary_data(rgb_lcd_panel_test.elf "resources/pictures/hello.yuv" BINARY)
+target_add_binary_data(rgb_lcd_panel_test.elf "resources/pictures/world.yuv" BINARY)
+
 if(CONFIG_COMPILER_DUMP_RTL_FILES)
     add_custom_target(check_test_app_sections ALL
                       COMMAND ${PYTHON} $ENV{IDF_PATH}/tools/ci/check_callgraph.py

components/esp_lcd/test_apps/rgb_lcd/main/CMakeLists.txt

@@ -1,6 +1,10 @@
 set(srcs "test_app_main.c"
          "test_rgb_panel.c")
 
+if(CONFIG_SOC_LCD_SUPPORT_RGB_YUV_CONV)
+    list(APPEND srcs "test_yuv_rgb_conv.c")
+endif()
+
 # In order for the cases defined by `TEST_CASE` to be linked into the final elf,
 # the component can be registered as WHOLE_ARCHIVE
 idf_component_register(SRCS ${srcs}

components/esp_lcd/test_apps/rgb_lcd/main/test_yuv_rgb_conv.c

@@ -0,0 +1,105 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <stdio.h>
+#include <string.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "unity.h"
+#include "esp_lcd_panel_rgb.h"
+#include "esp_lcd_panel_ops.h"
+#include "esp_random.h"
+#include "esp_timer.h"
+#include "esp_attr.h"
+#include "spi_flash_mmap.h"
+#include "test_rgb_board.h"
+
+#define TEST_IMG_SIZE (320 * 320 * sizeof(uint16_t))
+
+// YUV images are embedded in the firmware binary
+extern const uint8_t image_hello_yuv_start[] asm("_binary_hello_yuv_start");
+extern const uint8_t image_hello_yuv_end[]   asm("_binary_hello_yuv_end");
+extern const uint8_t image_world_yuv_start[] asm("_binary_world_yuv_start");
+extern const uint8_t image_world_yuv_end[]   asm("_binary_world_yuv_end");
+
+TEST_CASE("lcd_rgb_panel_yuv422_conversion", "[lcd]")
+{
+    esp_lcd_panel_handle_t panel_handle = NULL;
+    esp_lcd_rgb_panel_config_t panel_config = {
+        .data_width = 16,
+        .psram_trans_align = 64,
+        .bits_per_pixel = 16, // YUV422: 16bits per pixel
+        .clk_src = LCD_CLK_SRC_DEFAULT,
+        .disp_gpio_num = TEST_LCD_DISP_EN_GPIO,
+        .pclk_gpio_num = TEST_LCD_PCLK_GPIO,
+        .vsync_gpio_num = TEST_LCD_VSYNC_GPIO,
+        .hsync_gpio_num = TEST_LCD_HSYNC_GPIO,
+        .de_gpio_num = TEST_LCD_DE_GPIO,
+        .data_gpio_nums = {
+            TEST_LCD_DATA0_GPIO,
+            TEST_LCD_DATA1_GPIO,
+            TEST_LCD_DATA2_GPIO,
+            TEST_LCD_DATA3_GPIO,
+            TEST_LCD_DATA4_GPIO,
+            TEST_LCD_DATA5_GPIO,
+            TEST_LCD_DATA6_GPIO,
+            TEST_LCD_DATA7_GPIO,
+            TEST_LCD_DATA8_GPIO,
+            TEST_LCD_DATA9_GPIO,
+            TEST_LCD_DATA10_GPIO,
+            TEST_LCD_DATA11_GPIO,
+            TEST_LCD_DATA12_GPIO,
+            TEST_LCD_DATA13_GPIO,
+            TEST_LCD_DATA14_GPIO,
+            TEST_LCD_DATA15_GPIO,
+        },
+        .timings = {
+            .pclk_hz = TEST_LCD_PIXEL_CLOCK_HZ,
+            .h_res = TEST_LCD_H_RES,
+            .v_res = TEST_LCD_V_RES,
+            .hsync_back_porch = 68,
+            .hsync_front_porch = 20,
+            .hsync_pulse_width = 5,
+            .vsync_back_porch = 18,
+            .vsync_front_porch = 4,
+            .vsync_pulse_width = 1,
+        },
+        .flags.fb_in_psram = 1, // allocate frame buffer in PSRAM
+    };
+
+    printf("Create RGB LCD panel\r\n");
+    TEST_ESP_OK(esp_lcd_new_rgb_panel(&panel_config, &panel_handle));
+    TEST_ESP_OK(esp_lcd_panel_reset(panel_handle));
+
+    printf("Set YUV-RGB conversion profile\r\n");
+    esp_lcd_yuv_conv_config_t conv_config = {
+        .std = LCD_YUV_CONV_STD_BT601,
+        .src = {
+            .color_range = LCD_COLOR_RANGE_FULL,
+            .color_space = LCD_COLOR_SPACE_RGB,
+        },
+        .dst = {
+            .color_range = LCD_COLOR_RANGE_FULL,
+            .color_space = LCD_COLOR_SPACE_RGB,
+        },
+    };
+    TEST_ESP_ERR(ESP_ERR_INVALID_ARG, esp_lcd_rgb_panel_set_yuv_conversion(panel_handle, &conv_config));
+
+    conv_config.src.color_space = LCD_COLOR_SPACE_YUV;
+    conv_config.src.yuv_sample = LCD_YUV_SAMPLE_422;
+    TEST_ESP_OK(esp_lcd_rgb_panel_set_yuv_conversion(panel_handle, &conv_config));
+
+    TEST_ESP_OK(esp_lcd_panel_init(panel_handle));
+
+    printf("Draw YUV images\r\n");
+    for (int i = 0; i < 4; i++) {
+        TEST_ESP_OK(esp_lcd_panel_draw_bitmap(panel_handle, 0, 0, 320, 320, image_hello_yuv_start));
+        vTaskDelay(pdMS_TO_TICKS(1000));
+        TEST_ESP_OK(esp_lcd_panel_draw_bitmap(panel_handle, 0, 0, 320, 320, image_world_yuv_start));
+        vTaskDelay(pdMS_TO_TICKS(1000));
+    }
+
+    TEST_ESP_OK(esp_lcd_panel_del(panel_handle));
+}

components/esp_lcd/test_apps/rgb_lcd/resources/README.md

@@ -0,0 +1,5 @@
+# How to generate the YUV image from the PNG image
+
+```bash
+ffmpeg -i hello.png -pix_fmt uyvy422 hello.yuv
+```