ESP32-S3 RGB接口驱动ST7701S显示PCLK超过12MHz会画面倾斜怎么处理？

编程框架: idf-5.0
LVGL: V7.11

[基本信息]
基于idf-5.0框架的rgb_panel示例修改, 手里的显示屏驱动芯片为ST7701S, 接口RGB565, 分辨率800*480

[问题]
使用的防撕裂方式为两个信号量"sem_vsync_end, sem_gui_ready", 与idf示例相同, 双buf缓冲.
问题是"LCD_PIXEL_CLOCK_HZ"这个参数目前限制在了12MHz, 超过这个值后显示的画面会发生器偏移(右移),
但是rgb_panel的示例可以18MHz刷新, 并且查阅网上其他类似项目也可以在18MHz跑, 画面会流畅很多
请问我的跑不到18MHz是为什么? 是代码的问题还是显示屏的问题?

[初始化代码]Code: Select all
/* * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: CC0-1.0 */#include #include "sdkconfig.h"#include "freertos/FreeRTOS.h"#include "freertos/task.h"#include "freertos/semphr.h"#include "esp_timer.h"#include "esp_lcd_panel_ops.h"#include "esp_lcd_panel_rgb.h"#include "driver/gpio.h"#include "esp_err.h"#include "esp_log.h"#include "bsp_board.h"#include "lvgl.h"#include "rgb_lcd.h"#include "my_spi.h"#include "gt911.h"#include "tca9554.h"static const char *TAG = "rgb_lcd";//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// Please update the following configuration according to your LCD spec //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////#define LCD_PIXEL_CLOCK_HZ     (12 * 1000 * 1000)#define LCD_BK_LIGHT_ON_LEVEL  1#define LCD_BK_LIGHT_OFF_LEVEL !LCD_BK_LIGHT_ON_LEVEL#define LCD_PIN_NUM_BK_LIGHT       (-1)#define LCD_PIN_NUM_HSYNC          GPIO_LCD_HSYNC#define LCD_PIN_NUM_VSYNC          GPIO_LCD_VSYNC#define LCD_PIN_NUM_DE             GPIO_LCD_DE#define LCD_PIN_NUM_PCLK           GPIO_LCD_PCLK#define LCD_PIN_NUM_DATA0          GPIO_LCD_D00 // B0#define LCD_PIN_NUM_DATA1          GPIO_LCD_D01 // B1#define LCD_PIN_NUM_DATA2          GPIO_LCD_D02 // B2#define LCD_PIN_NUM_DATA3          GPIO_LCD_D03 // B3#define LCD_PIN_NUM_DATA4          GPIO_LCD_D04 // B4#define LCD_PIN_NUM_DATA5          GPIO_LCD_D05 // G0#define LCD_PIN_NUM_DATA6          GPIO_LCD_D06 // G1#define LCD_PIN_NUM_DATA7          GPIO_LCD_D07 // G2#define LCD_PIN_NUM_DATA8          GPIO_LCD_D08 // G3#define LCD_PIN_NUM_DATA9          GPIO_LCD_D09 // G4#define LCD_PIN_NUM_DATA10         GPIO_LCD_D10 // G5#define LCD_PIN_NUM_DATA11         GPIO_LCD_D11 // R0#define LCD_PIN_NUM_DATA12         GPIO_LCD_D12 // R1#define LCD_PIN_NUM_DATA13         GPIO_LCD_D13 // R2#define LCD_PIN_NUM_DATA14         GPIO_LCD_D14 // R3#define LCD_PIN_NUM_DATA15         GPIO_LCD_D15 // R4#define LCD_PIN_NUM_DISP_EN        GPIO_LCD_DISP_EN// The pixel number in horizontal and vertical#define LCD_H_RES              480#define LCD_V_RES              800#define LCD_SCR_SIZE           (LCD_H_RES * LCD_V_RES)static const uint32_t tick_inc_period_ms = 2;// we use two semaphores to sync the VSYNC event and the LVGL task, to avoid potential tearing effect#if CONFIG_EXAMPLE_AVOID_TEAR_EFFECT_WITH_SEMSemaphoreHandle_t sem_vsync_end;SemaphoreHandle_t sem_gui_ready;#endifstatic bool example_on_vsync_event(esp_lcd_panel_handle_t panel, const esp_lcd_rgb_panel_event_data_t *event_data, void *user_data){    BaseType_t high_task_awoken = pdFALSE;#if CONFIG_EXAMPLE_AVOID_TEAR_EFFECT_WITH_SEM    if (xSemaphoreTakeFromISR(sem_gui_ready, &high_task_awoken) == pdTRUE) {        xSemaphoreGiveFromISR(sem_vsync_end, &high_task_awoken);    }#endif    return high_task_awoken == pdTRUE;}static IRAM_ATTR void lvgl_flush_cb(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map){    esp_lcd_panel_handle_t panel_handle = (esp_lcd_panel_handle_t) drv->user_data;    int offsetx1 = area->x1;    int offsetx2 = area->x2;    int offsety1 = area->y1;    int offsety2 = area->y2;#if CONFIG_EXAMPLE_AVOID_TEAR_EFFECT_WITH_SEM    xSemaphoreGive(sem_gui_ready);    xSemaphoreTake(sem_vsync_end, portMAX_DELAY);#endif    // pass the draw buffer to the driver    esp_lcd_panel_draw_bitmap(panel_handle, offsetx1, offsety1, offsetx2 + 1, offsety2 + 1, color_map);    lv_disp_flush_ready(drv);}static IRAM_ATTR bool lvgl_read_cb(lv_indev_drv_t * indev_drv, lv_indev_data_t * data){    static uint8_t tp_num = 0;    static uint16_t x = 0, y = 0;    gt911_get_touch(&tp_num, &x, &y);    if (0 == tp_num) {        data->state = LV_INDEV_STATE_REL;    } else {        /* not swap xy */        data->point.x = x;        data->point.y = y;        data->state = LV_INDEV_STATE_PR;//        ESP_LOGI(TAG, "Touch (%d): [X-%d,Y-%d]", tp_num, x, y);    }    return false;}static void lvgl_increase_tick(void *arg){    /* Tell LVGL how many milliseconds has elapsed */    lv_tick_inc(tick_inc_period_ms);}static void lv_handler_task(void *pvparam){    static TickType_t tick;    tick = xTaskGetTickCount();    while (1) {        // The task running lv_timer_handler should have lower priority than that running `lv_tick_inc`        lv_task_handler();        // raise the task priority of LVGL and/or reduce the handler period can improve the performance        vTaskDelayUntil(&tick, pdMS_TO_TICKS(10));    }}esp_err_t rgb_lcd_init(void){    static lv_disp_buf_t disp_buf; // contains internal graphic buffer(s) called draw buffer(s)    static lv_disp_drv_t disp_drv; // contains callback functions#if CONFIG_EXAMPLE_AVOID_TEAR_EFFECT_WITH_SEM    ESP_LOGI(TAG, "Create 2 semaphores");    sem_vsync_end = xSemaphoreCreateBinary();    assert(sem_vsync_end);    sem_gui_ready = xSemaphoreCreateBinary();    assert(sem_gui_ready);#endif    ESP_LOGI(TAG, "SPI config parameters to rgb lcd.");    lcd_on_sequence();    vTaskDelay(pdMS_TO_TICKS(100));#if LCD_PIN_NUM_BK_LIGHT >= 0    ESP_LOGI(TAG, "Turn off LCD backlight");    gpio_config_t bk_gpio_config = {            .mode = GPIO_MODE_OUTPUT,            .pin_bit_mask = 1ULL << LCD_PIN_NUM_BK_LIGHT    };    ESP_ERROR_CHECK(gpio_config(&bk_gpio_config));#endif    /* Init LCD config */    ESP_LOGI(TAG, "Install RGB LCD panel driver");    esp_lcd_panel_handle_t panel_handle = NULL;    esp_lcd_rgb_panel_config_t panel_config = {            .data_width = 16, // RGB565 in parallel mode, thus 16bit in width            .psram_trans_align = 64,#if CONFIG_EXAMPLE_USE_BOUNCE_BUFFER            .bounce_buffer_size_px = 10 * EXAMPLE_LCD_H_RES,#endif            .clk_src = LCD_CLK_SRC_PLL240M,            .disp_gpio_num = LCD_PIN_NUM_DISP_EN,            .pclk_gpio_num = LCD_PIN_NUM_PCLK,            .vsync_gpio_num = LCD_PIN_NUM_VSYNC,            .hsync_gpio_num = LCD_PIN_NUM_HSYNC,            .de_gpio_num = LCD_PIN_NUM_DE,            .data_gpio_nums = {                    LCD_PIN_NUM_DATA0,                    LCD_PIN_NUM_DATA1,                    LCD_PIN_NUM_DATA2,                    LCD_PIN_NUM_DATA3,                    LCD_PIN_NUM_DATA4,                    LCD_PIN_NUM_DATA5,                    LCD_PIN_NUM_DATA6,                    LCD_PIN_NUM_DATA7,                    LCD_PIN_NUM_DATA8,                    LCD_PIN_NUM_DATA9,                    LCD_PIN_NUM_DATA10,                    LCD_PIN_NUM_DATA11,                    LCD_PIN_NUM_DATA12,                    LCD_PIN_NUM_DATA13,                    LCD_PIN_NUM_DATA14,                    LCD_PIN_NUM_DATA15,            },            .timings = {                    .pclk_hz = LCD_PIXEL_CLOCK_HZ,                    .h_res = LCD_H_RES,                    .v_res = LCD_V_RES,                    // The following parameters should refer to LCD spec                    .hsync_back_porch = 40,                    .hsync_front_porch = 80,                    .hsync_pulse_width = 2,                    .vsync_back_porch = 30,                    .vsync_front_porch = 30,                    .vsync_pulse_width = 2,                    .flags.pclk_active_neg = true,            },            .flags.fb_in_psram = true, // allocate frame buffer in PSRAM#if CONFIG_EXAMPLE_DOUBLE_FB            .flags.double_fb = true,   // allocate double frame buffer#endif // CONFIG_EXAMPLE_DOUBLE_FB    };    ESP_ERROR_CHECK(esp_lcd_new_rgb_panel(&panel_config, &panel_handle));    ESP_LOGI(TAG, "Register event vsync callbacks");    esp_lcd_rgb_panel_event_callbacks_t cbs = {        .on_vsync = example_on_vsync_event,    };    ESP_ERROR_CHECK(esp_lcd_rgb_panel_register_event_callbacks(panel_handle, &cbs, &disp_drv));    ESP_LOGI(TAG, "Initialize RGB LCD panel");    ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_handle));    ESP_ERROR_CHECK(esp_lcd_panel_init(panel_handle));    ESP_LOGI(TAG, "Initialize LVGL library");    lv_init();    void *buf1 = NULL;    void *buf2 = NULL;    uint32_t flush_size = (LCD_SCR_SIZE / 4);#if CONFIG_EXAMPLE_DOUBLE_FB    ESP_LOGI(TAG, "Use frame buffers as LVGL draw buffers");    ESP_ERROR_CHECK(esp_lcd_rgb_panel_get_frame_buffer(panel_handle, 2, &buf1, &buf2));    // initialize LVGL draw buffers    lv_disp_buf_init(&disp_buf, buf1, buf2, EXAMPLE_LCD_H_RES * EXAMPLE_LCD_V_RES);#else    ESP_LOGI(TAG, "Allocate separate LVGL draw buffers from PSRAM");    buf1 = heap_caps_malloc(flush_size * sizeof(lv_color_t), MALLOC_CAP_SPIRAM);    assert(buf1);    buf2 = heap_caps_malloc(flush_size * sizeof(lv_color_t), MALLOC_CAP_SPIRAM);    assert(buf2);    if (NULL == buf1 || NULL == buf2) {        ESP_LOGE(TAG, "No free mem for allocating lvgl display buffer.");        return ESP_ERR_NO_MEM;    }    // initialize LVGL draw buffers    lv_disp_buf_init(&disp_buf, buf1, buf2, flush_size);//    lv_disp_buf_init(&disp_buf, buf1, NULL, flush_size);#endif // CONFIG_EXAMPLE_DOUBLE_FB    ESP_LOGI(TAG, "Register display driver to LVGL");    lv_disp_drv_init(&disp_drv);    disp_drv.hor_res = LCD_H_RES;    disp_drv.ver_res = LCD_V_RES;    disp_drv.flush_cb = lvgl_flush_cb;    disp_drv.buffer = &disp_buf; //disp_buf for lvgl 7.11.0    disp_drv.user_data = panel_handle;#if CONFIG_EXAMPLE_DOUBLE_FB//    disp_drv.full_refresh = true; // the full_refresh mode can maintain the synchronization between the two frame buffers#endif    lv_disp_drv_register(&disp_drv);    /* Init touchpad driver */    ESP_LOGI(TAG, "Initialize gt911 touch pad driver.");    ESP_ERROR_CHECK(gt911_init());    ESP_LOGI(TAG, "Register input devcie and callback.");    lv_indev_drv_t indev_drv;    lv_indev_drv_init(&indev_drv);    indev_drv.type = LV_INDEV_TYPE_POINTER;    indev_drv.read_cb = lvgl_read_cb;    lv_indev_drv_register(&indev_drv);    ESP_LOGI(TAG, "Install LVGL tick timer");    // Tick interface for LVGL (using esp_timer to generate 2ms periodic event)    const esp_timer_create_args_t lvgl_tick_timer_args = {            .callback = &lvgl_increase_tick,            .name = "lvgl_tick",            .arg = (void*)&tick_inc_period_ms,            .dispatch_method = ESP_TIMER_TASK,            .skip_unhandled_events = true,    };    esp_timer_handle_t lvgl_tick_timer = NULL;    ESP_ERROR_CHECK(esp_timer_create(&lvgl_tick_timer_args, &lvgl_tick_timer));    ESP_ERROR_CHECK(esp_timer_start_periodic(lvgl_tick_timer, tick_inc_period_ms * 1000));    ESP_LOGI(TAG, "Create a task for 'lv_handler_task'.");    if (pdPASS != xTaskCreatePinnedToCore (            (TaskFunction_t)      lv_handler_task,            (const char * const)     "LVGL Handler Task",            (const uint32_t)     4 * 1024,            (void * const)       NULL,            (UBaseType_t)           (configMAX_PRIORITIES - 2),            (TaskHandle_t * const)  NULL,            (BaseType_t) tskNO_AFFINITY ))    {        return ESP_ERR_NO_MEM;    } //FreeRTOS 任务优先级数字越小, 优先级越低#if LCD_PIN_NUM_BK_LIGHT >= 0    ESP_LOGI(TAG, "Turn on LCD backlight");    gpio_set_level(LCD_PIN_NUM_BK_LIGHT, LCD_BK_LIGHT_ON_LEVEL);#endif    ESP_LOGI(TAG, "Display part is initialize OK now!");    return ESP_OK;}/** * @brief LCD power on sequence * */void lcd_on_sequence(void){    //Hardware Reset: 1 -> 0 -> 1    io_level.lcd_rst = 1;    tca9554_write_output_pins(io_level.val);    vTaskDelay(pdMS_TO_TICKS(5));    io_level.lcd_rst = 0;    tca9554_write_output_pins(io_level.val);    vTaskDelay(pdMS_TO_TICKS(5));    io_level.lcd_rst = 1;    tca9554_write_output_pins(io_level.val);    vTaskDelay(pdMS_TO_TICKS(120));    spi_lcd_on_handler();}/** * @brief LCD power off sequence * */void lcd_off_sequence(void){    spi_lcd_off_handler();    vTaskDelay(pdMS_TO_TICKS(10));    io_level.lcd_rst = 0;    tca9554_write_output_pins(io_level.val);    vTaskDelay(pdMS_TO_TICKS(100));}