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rgb_lcd_example_main.c
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rgb_lcd_example_main.c
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/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: CC0-1.0
*/
#include <stdio.h>
#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 "lvgl.h"
static const char *TAG = "example";
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////// Please update the following configuration according to your LCD spec //////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#define EXAMPLE_LCD_PIXEL_CLOCK_HZ (18 * 1000 * 1000)
#define EXAMPLE_LCD_BK_LIGHT_ON_LEVEL 1
#define EXAMPLE_LCD_BK_LIGHT_OFF_LEVEL !EXAMPLE_LCD_BK_LIGHT_ON_LEVEL
#define EXAMPLE_PIN_NUM_BK_LIGHT 4
#define EXAMPLE_PIN_NUM_HSYNC 46
#define EXAMPLE_PIN_NUM_VSYNC 3
#define EXAMPLE_PIN_NUM_DE 0
#define EXAMPLE_PIN_NUM_PCLK 9
#define EXAMPLE_PIN_NUM_DATA0 14 // B0
#define EXAMPLE_PIN_NUM_DATA1 13 // B1
#define EXAMPLE_PIN_NUM_DATA2 12 // B2
#define EXAMPLE_PIN_NUM_DATA3 11 // B3
#define EXAMPLE_PIN_NUM_DATA4 10 // B4
#define EXAMPLE_PIN_NUM_DATA5 39 // G0
#define EXAMPLE_PIN_NUM_DATA6 38 // G1
#define EXAMPLE_PIN_NUM_DATA7 45 // G2
#define EXAMPLE_PIN_NUM_DATA8 48 // G3
#define EXAMPLE_PIN_NUM_DATA9 47 // G4
#define EXAMPLE_PIN_NUM_DATA10 21 // G5
#define EXAMPLE_PIN_NUM_DATA11 1 // R0
#define EXAMPLE_PIN_NUM_DATA12 2 // R1
#define EXAMPLE_PIN_NUM_DATA13 42 // R2
#define EXAMPLE_PIN_NUM_DATA14 41 // R3
#define EXAMPLE_PIN_NUM_DATA15 40 // R4
#define EXAMPLE_PIN_NUM_DISP_EN -1
// The pixel number in horizontal and vertical
#define EXAMPLE_LCD_H_RES 800
#define EXAMPLE_LCD_V_RES 480
#if CONFIG_EXAMPLE_DOUBLE_FB
#define EXAMPLE_LCD_NUM_FB 2
#else
#define EXAMPLE_LCD_NUM_FB 1
#endif // CONFIG_EXAMPLE_DOUBLE_FB
#define EXAMPLE_LVGL_TICK_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_SEM
SemaphoreHandle_t sem_vsync_end;
SemaphoreHandle_t sem_gui_ready;
#endif
extern void example_lvgl_demo_ui(lv_disp_t *disp);
static 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 void example_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 void example_increase_lvgl_tick(void *arg)
{
/* Tell LVGL how many milliseconds has elapsed */
lv_tick_inc(EXAMPLE_LVGL_TICK_PERIOD_MS);
}
void app_main(void)
{
static lv_disp_draw_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 semaphores");
sem_vsync_end = xSemaphoreCreateBinary();
assert(sem_vsync_end);
sem_gui_ready = xSemaphoreCreateBinary();
assert(sem_gui_ready);
#endif
#if EXAMPLE_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 << EXAMPLE_PIN_NUM_BK_LIGHT
};
ESP_ERROR_CHECK(gpio_config(&bk_gpio_config));
#endif
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,
.num_fbs = EXAMPLE_LCD_NUM_FB,
#if CONFIG_EXAMPLE_USE_BOUNCE_BUFFER
.bounce_buffer_size_px = 10 * EXAMPLE_LCD_H_RES,
#endif
.clk_src = LCD_CLK_SRC_DEFAULT,
.disp_gpio_num = EXAMPLE_PIN_NUM_DISP_EN,
.pclk_gpio_num = EXAMPLE_PIN_NUM_PCLK,
.vsync_gpio_num = EXAMPLE_PIN_NUM_VSYNC,
.hsync_gpio_num = EXAMPLE_PIN_NUM_HSYNC,
.de_gpio_num = EXAMPLE_PIN_NUM_DE,
.data_gpio_nums = {
EXAMPLE_PIN_NUM_DATA0,
EXAMPLE_PIN_NUM_DATA1,
EXAMPLE_PIN_NUM_DATA2,
EXAMPLE_PIN_NUM_DATA3,
EXAMPLE_PIN_NUM_DATA4,
EXAMPLE_PIN_NUM_DATA5,
EXAMPLE_PIN_NUM_DATA6,
EXAMPLE_PIN_NUM_DATA7,
EXAMPLE_PIN_NUM_DATA8,
EXAMPLE_PIN_NUM_DATA9,
EXAMPLE_PIN_NUM_DATA10,
EXAMPLE_PIN_NUM_DATA11,
EXAMPLE_PIN_NUM_DATA12,
EXAMPLE_PIN_NUM_DATA13,
EXAMPLE_PIN_NUM_DATA14,
EXAMPLE_PIN_NUM_DATA15,
},
.timings = {
.pclk_hz = EXAMPLE_LCD_PIXEL_CLOCK_HZ,
.h_res = EXAMPLE_LCD_H_RES,
.v_res = EXAMPLE_LCD_V_RES,
// The following parameters should refer to LCD spec
.hsync_back_porch = 40,
.hsync_front_porch = 20,
.hsync_pulse_width = 1,
.vsync_back_porch = 8,
.vsync_front_porch = 4,
.vsync_pulse_width = 1,
.flags.pclk_active_neg = true,
},
.flags.fb_in_psram = true, // allocate frame buffer in PSRAM
};
ESP_ERROR_CHECK(esp_lcd_new_rgb_panel(&panel_config, &panel_handle));
ESP_LOGI(TAG, "Register event 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));
#if EXAMPLE_PIN_NUM_BK_LIGHT >= 0
ESP_LOGI(TAG, "Turn on LCD backlight");
gpio_set_level(EXAMPLE_PIN_NUM_BK_LIGHT, EXAMPLE_LCD_BK_LIGHT_ON_LEVEL);
#endif
ESP_LOGI(TAG, "Initialize LVGL library");
lv_init();
void *buf1 = NULL;
void *buf2 = NULL;
#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_draw_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(EXAMPLE_LCD_H_RES * 100 * sizeof(lv_color_t), MALLOC_CAP_SPIRAM);
assert(buf1);
buf2 = heap_caps_malloc(EXAMPLE_LCD_H_RES * 100 * sizeof(lv_color_t), MALLOC_CAP_SPIRAM);
assert(buf2);
// initialize LVGL draw buffers
lv_disp_draw_buf_init(&disp_buf, buf1, buf2, EXAMPLE_LCD_H_RES * 100);
#endif // CONFIG_EXAMPLE_DOUBLE_FB
ESP_LOGI(TAG, "Register display driver to LVGL");
lv_disp_drv_init(&disp_drv);
disp_drv.hor_res = EXAMPLE_LCD_H_RES;
disp_drv.ver_res = EXAMPLE_LCD_V_RES;
disp_drv.flush_cb = example_lvgl_flush_cb;
disp_drv.draw_buf = &disp_buf;
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_t *disp = lv_disp_drv_register(&disp_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 = &example_increase_lvgl_tick,
.name = "lvgl_tick"
};
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, EXAMPLE_LVGL_TICK_PERIOD_MS * 1000));
ESP_LOGI(TAG, "Display LVGL Scatter Chart");
example_lvgl_demo_ui(disp);
while (1) {
// raise the task priority of LVGL and/or reduce the handler period can improve the performance
vTaskDelay(pdMS_TO_TICKS(10));
// The task running lv_timer_handler should have lower priority than that running `lv_tick_inc`
lv_timer_handler();
}
}