give this a try
#include <stdio.h>
#include <unistd.h>
#include <sys/lock.h>
#include <sys/param.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_timer.h"
#include "esp_lcd_panel_io.h"
#include "esp_lcd_panel_vendor.h"
#include "esp_lcd_panel_ops.h"
#include "esp_lcd_panel_st7789.h"
#include "driver/gpio.h"
#include "driver/spi_master.h"
#include "esp_check.h"
#include "esp_err.h"
#include "esp_log.h"
#include "lvgl.h"
static const char *TAG = "MyDisplay";
/* LCD size */
#define DISP_HOR_RES 240
#define DISP_VER_RES 320
/* LCD settings */
#define DISP_DRAW_BUFF_HEIGHT 50
/* LCD pins */
#define DISP_SPI_NUM SPI3_HOST
#define DISP_GPIO_SCLK GPIO_NUM_41 // GPIO_NUM_6
#define DISP_GPIO_MOSI GPIO_NUM_40 // GPIO_NUM_7
#define DISP_GPIO_RST GPIO_NUM_39 // GPIO_NUM_8
#define DISP_GPIO_DC GPIO_NUM_44 // GPIO_NUM_4
#define DISP_GPIO_CS GPIO_NUM_42 // GPIO_NUM_5
#define DISP_GPIO_BL GPIO_NUM_1 // GPIO_NUM_15
/* Touch settings */
#define DISP_TOUCH_I2C_NUM I2C_NUM_1
#define DISP_TOUCH_I2C_CLK_HZ 400000 // 400000
/* LCD touch pins */
#define TOUCH_I2C_SCL GPIO_NUM_21 // GPIO_NUM_21 9
#define TOUCH_I2C_SDA GPIO_NUM_14 // GPIO_NUM_14 10
#define TOUCH_GPIO_INT GPIO_NUM_38 // GPIO_NUM_38
#define TOUCH_GPIO_RST GPIO_NUM_11 // GPIO_NUM_11 // dummy
#define BUFFER_SIZE (DISP_HOR_RES * DISP_VER_RES * sizeof(uint16_t) / 10)
static esp_lcd_panel_handle_t panel_handle = NULL;
static esp_lcd_panel_io_handle_t io_handle = NULL;
static lv_display_t *display = NULL;
static void* buf1 = NULL;
static void* buf2 = NULL;
// this gets called when the DMA transfer of the buffer data has completed
static bool notify_flush_ready(esp_lcd_panel_io_handle_t panel_io, esp_lcd_panel_io_event_data_t *edata, void *user_ctx)
{
lv_display_t *disp = (lv_display_t *)user_ctx;
lv_display_flush_ready(disp);
return false;
}
static void flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map)
{
int x1 = area->x1;
int x2 = area->x2;
int y1 = area->y1;
int y2 = area->y2;
// uncomment the following line if the colors are wrong
// lv_draw_sw_rgb565_swap(px_map, (x2 + 1 - x1) * (y2 + 1 - y1));
esp_lcd_panel_draw_bitmap((esp_lcd_panel_handle_t)lv_display_get_user_data(disp), x1, y1, x2 + 1, y2 + 1, px_map);
}
static void lvgl_tick_increment(void *arg)
{
// Tell LVGL how many milliseconds have elapsed
lv_tick_inc(2); // tjek
}
static esp_err_t lvgl_tick_init(void)
{
esp_timer_handle_t 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_tick_increment,
.name = "LVGL tick",
};
ESP_RETURN_ON_ERROR(esp_timer_create(&lvgl_tick_timer_args, &tick_timer), TAG, "esp_timer_create error");
return esp_timer_start_periodic(tick_timer, 2 * 1000); // 2 ms
}
static esp_err_t lvgl_init(void)
{
lv_init();
display = lv_display_create(DISP_HOR_RES, DISP_VER_RES);
buf1 = heap_caps_calloc(1, BUFFER_SIZE, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA);
buf2 = heap_caps_calloc(1, BUFFER_SIZE, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA);
lv_display_set_buffers(display, buf1, buf2, BUFFER_SIZE, LV_DISPLAY_RENDER_MODE_PARTIAL);
lv_display_set_user_data(display, panel_handle);
lv_display_set_color_format(display, LV_COLOR_FORMAT_RGB565);
lv_display_set_flush_cb(display, flush_cb);
const esp_lcd_panel_io_callbacks_t cbs = {
.on_color_trans_done = notify_flush_ready,
};
/* Register done callback */
ESP_RETURN_ON_ERROR(esp_lcd_panel_io_register_event_callbacks(io_handle, &cbs, display), TAG, "esp_lcd_panel_io_register_event_callbacks error");
ESP_RETURN_ON_ERROR(esp_lcd_panel_init(panel_handle), TAG, "esp_lcd_panel_init error");
return ESP_OK;
}
static esp_err_t display_init(void)
{
/* LCD backlight and DC */
gpio_config_t gpio_cfg = {
.pin_bit_mask = (1ULL << DISP_GPIO_BL),
.mode = GPIO_MODE_OUTPUT,
};
ESP_RETURN_ON_ERROR(gpio_config(&gpio_cfg), TAG, "gpio_config error");
/* LCD initialization */
ESP_LOGD(TAG, "Initialize SPI bus");
spi_bus_config_t buscfg = {
.sclk_io_num = DISP_GPIO_SCLK,
.mosi_io_num = DISP_GPIO_MOSI,
.miso_io_num = GPIO_NUM_NC,
.quadwp_io_num = GPIO_NUM_NC,
.quadhd_io_num = GPIO_NUM_NC,
.max_transfer_sz = BUFFER_SIZE
};
ESP_RETURN_ON_ERROR(spi_bus_initialize(DISP_SPI_NUM, &buscfg, SPI_DMA_CH_AUTO), TAG, "spi_bus_initialize error");
esp_lcd_panel_io_spi_config_t io_config = {
.dc_gpio_num = DISP_GPIO_DC,
.cs_gpio_num = DISP_GPIO_CS,
.pclk_hz = 80 * 1000 * 1000,
.lcd_cmd_bits = 8,
.lcd_param_bits = 8,
.spi_mode = 0,
.trans_queue_depth = 10
};
ESP_RETURN_ON_ERROR(esp_lcd_new_panel_io_spi((esp_lcd_spi_bus_handle_t)DISP_SPI_NUM, &io_config, &io_handle), "esp_lcd_new_panel_io_spi error");
esp_lcd_panel_dev_config_t panel_config = {
.reset_gpio_num = DISP_GPIO_RST,
.rgb_ele_order = LCD_RGB_ELEMENT_ORDER_RGB,
.bits_per_pixel = 16,
.flags.reset_active_high = 1
};
ESP_RETURN_ON_ERROR(esp_lcd_new_panel_st7789(io_handle, &panel_config, &panel_handle), "esp_lcd_new_panel_st7789 error");
return ESP_OK;
}
void app_main() {
vTaskDelay(5000/portTICK_PERIOD_MS);
esp_err_t ret = display_init(void);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "ST7796 failed to initilize");
while (1);
}
ret = lvgl_init(void);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "LVGL Display failed to initialize");
while (1);
}
ret = lvgl_tick_init();
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Timer failed to initialize");
while (1);
}
// Create a simple label
lv_obj_t *label = lv_label_create(lv_screen_active());
lv_label_set_text(label, "Hello, LVGL!");
lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
gpio_set_level(DISP_GPIO_BL, 1); // Turn on backlight
long curtime = esp_timer_get_time()/1000;
int counter = 0;
// Handle LVGL tasks
while (1) {
vTaskDelay(pdMS_TO_TICKS(10));
lv_task_handler();
if (esp_timer_get_time() / 1000 - curtime > 1000) {
curtime = esp_timer_get_time() / 1000;
char textlabel[20];
sprintf(textlabel, "Running: %u\n", counter);
printf(textlabel);
lv_label_set_text(label, textlabel);
counter++;
}
}
}
