Description
I’m driving a monochrome display (e-ink) with lvgl and esp32. After first initialisation it displays stuff exactly how I want to, but it does not want to fully refresh afterwards. When I update anything in LVGL after the first image has been drawn, it starts to do something - it will partially draw a random noise to a part of the screen, but it will never affect the overall image, so it will mostly stay the same and never update.
What MCU/Processor/Board and compiler are you using?
ESP32s3, esp-idf v5.0
What LVGL version are you using?
8.3.0
My code is fairly long, but I don’t really suspect the code being at fault here (if I change a display to a standard LCD + different drivers it works exactly how I want to). I think it has to something with updating lv_tick_task() or lv_task_handler(), but I cannot really find any clear explanation if I for example have to set a longer update period to accommodate the e-ink (with SSD1680 display driver), or something like that. My code that does that is here: (it is a mashup of a code from GitHub - AramVartanyan/lvgl_test: Test the lvgl_esp32_drivers)
static const char *LVGL_TAG = "LVGL Handler";
#define LV_TICK_PERIOD_MS 1
static void lv_tick_task(void *arg);
static void _lvg_init(void *pvParameter);
SemaphoreHandle_t xGuiSemaphore;
void lvgl_init()
{
xTaskCreatePinnedToCore(_lvg_init, "lvgl_init_task", 4096*2, NULL, 0, NULL, 1);
}
static void _lvg_init(void *pvParameter) {
(void) pvParameter;
xGuiSemaphore = xSemaphoreCreateMutex();
lv_init();
/* Initialize SPI or I2C bus used by the drivers */
lvgl_driver_init();
lv_color_t* buf1 = heap_caps_malloc(DISP_BUF_SIZE * sizeof(lv_color_t), MALLOC_CAP_DMA);
assert(buf1 != NULL);
static lv_color_t *buf2 = NULL;
static lv_disp_draw_buf_t disp_buf;
uint32_t size_in_px = DISP_BUF_SIZE;
#if defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_IL3820 \
|| defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_JD79653A \
|| defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_UC8151D \
|| defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_SSD1680 \
|| defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_SSD1306
/* Actual size in pixels, not bytes. */
size_in_px *= 8;
#endif
/* Initialize the working buffer depending on the selected display.
* NOTE: buf2 == NULL when using monochrome displays. */
lv_disp_draw_buf_init(&disp_buf, buf1, buf2, size_in_px);
lv_disp_drv_t disp_drv;
lv_disp_drv_init(&disp_drv);
disp_drv.ver_res = 128;
disp_drv.hor_res = 296;
disp_drv.flush_cb = disp_driver_flush;
/* When using a monochrome display we need to register the callbacks:
* - rounder_cb
* - set_px_cb */
#ifdef CONFIG_LV_TFT_DISPLAY_MONOCHROME
disp_drv.rounder_cb = disp_driver_rounder;
disp_drv.set_px_cb = disp_driver_set_px;
#endif
disp_drv.draw_buf = &disp_buf;
// lv_disp_drv_register(&disp_drv);
lv_disp_t *disp = lv_disp_drv_register(&disp_drv); //lvgl v8+
/* Create and start a periodic timer interrupt to call lv_tick_inc */
const esp_timer_create_args_t periodic_timer_args = {
.callback = &lv_tick_task,
.name = "periodic_gui"
};
esp_timer_handle_t periodic_timer;
// esp_timer_handle_t periodic_timer = NULL; //lvgl v8+
ESP_ERROR_CHECK(esp_timer_create(&periodic_timer_args, &periodic_timer));
ESP_ERROR_CHECK(esp_timer_start_periodic(periodic_timer, LV_TICK_PERIOD_MS * 1000));
// ESP_ERROR_CHECK(esp_timer_start_periodic(periodic_timer, LV_TICK_PERIOD_MS * 200));
xSemaphoreGive(guiTaskSemaphore);
while (1) {
/* Delay 1 tick (assumes FreeRTOS tick is 10ms */
vTaskDelay(pdMS_TO_TICKS(10));
/* Try to take the semaphore, call lvgl related function on success */
if (pdTRUE == xSemaphoreTake(xGuiSemaphore, portMAX_DELAY)) {
lv_task_handler();
xSemaphoreGive(xGuiSemaphore);
}
}
/* A task should NEVER return */
free(buf1);
#ifndef CONFIG_LV_TFT_DISPLAY_MONOCHROME
free(buf2);
#endif
vTaskDelete(NULL);
}
static void lv_tick_task(void *arg) {
(void) arg;
// ESP_LOGI(LVGL_TAG, "tick inc");
lv_tick_inc(LV_TICK_PERIOD_MS);
}
thank you very much, I can add anything if it will help to solve this