/* * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: CC0-1.0 */ #include #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 "driver/i2c.h" #include "esp_err.h" #include "esp_log.h" #include "lvgl.h" static const char *TAG = "example"; #define I2C_HOST 0 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// //////////////////// Please update the following configuration according to your LCD spec ////////////////////////////// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// #define EXAMPLE_LCD_PIXEL_CLOCK_HZ (400 * 1000) #define EXAMPLE_PIN_NUM_SDA 3 #define EXAMPLE_PIN_NUM_SCL 4 #define EXAMPLE_PIN_NUM_RST -1 #define EXAMPLE_I2C_HW_ADDR 0x3C // The pixel number in horizontal and vertical #define EXAMPLE_LCD_H_RES 128 #define EXAMPLE_LCD_V_RES 64 // Bit number used to represent command and parameter #define EXAMPLE_LCD_CMD_BITS 8 #define EXAMPLE_LCD_PARAM_BITS 8 #define EXAMPLE_LVGL_TICK_PERIOD_MS 2 extern void example_lvgl_demo_ui(lv_disp_t *disp); static bool example_notify_lvgl_flush_ready(esp_lcd_panel_io_handle_t panel_io, esp_lcd_panel_io_event_data_t *edata, void *user_ctx) { lv_disp_drv_t *disp_driver = (lv_disp_drv_t *)user_ctx; lv_disp_flush_ready(disp_driver); return false; } 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; // copy a buffer's content to a specific area of the display esp_lcd_panel_draw_bitmap(panel_handle, offsetx1, offsety1, offsetx2 + 1, offsety2 + 1, color_map); } static void example_lvgl_set_px_cb(lv_disp_drv_t *disp_drv, uint8_t *buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y, lv_color_t color, lv_opa_t opa) { uint16_t byte_index = x + (( y >> 3 ) * buf_w); uint8_t bit_index = y & 0x7; if ((color.full == 0) && (LV_OPA_TRANSP != opa)) { buf[byte_index] |= (1 << bit_index); } else { buf[byte_index] &= ~(1 << bit_index); } } static void example_lvgl_rounder(lv_disp_drv_t *disp_drv, lv_area_t *area) { area->y1 = area->y1 & (~0x7); area->y2 = area->y2 | 0x7; } 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 ESP_LOGI(TAG, "Initialize I2C bus"); i2c_config_t i2c_conf = { .mode = I2C_MODE_MASTER, .sda_io_num = EXAMPLE_PIN_NUM_SDA, .scl_io_num = EXAMPLE_PIN_NUM_SCL, .sda_pullup_en = GPIO_PULLUP_ENABLE, .scl_pullup_en = GPIO_PULLUP_ENABLE, .master.clk_speed = EXAMPLE_LCD_PIXEL_CLOCK_HZ, }; ESP_ERROR_CHECK(i2c_param_config(I2C_HOST, &i2c_conf)); ESP_ERROR_CHECK(i2c_driver_install(I2C_HOST, I2C_MODE_MASTER, 0, 0, 0)); ESP_LOGI(TAG, "Install panel IO"); esp_lcd_panel_io_handle_t io_handle = NULL; esp_lcd_panel_io_i2c_config_t io_config = { .dev_addr = EXAMPLE_I2C_HW_ADDR, .control_phase_bytes = 1, // According to SSD1306 datasheet .dc_bit_offset = 6, // According to SSD1306 datasheet .lcd_cmd_bits = EXAMPLE_LCD_CMD_BITS, // According to SSD1306 datasheet .lcd_param_bits = EXAMPLE_LCD_CMD_BITS, // According to SSD1306 datasheet .on_color_trans_done = example_notify_lvgl_flush_ready, .user_ctx = &disp_drv, }; ESP_ERROR_CHECK(esp_lcd_new_panel_io_i2c((esp_lcd_i2c_bus_handle_t)I2C_HOST, &io_config, &io_handle)); ESP_LOGI(TAG, "Install SSD1306 panel driver"); esp_lcd_panel_handle_t panel_handle = NULL; esp_lcd_panel_dev_config_t panel_config = { .bits_per_pixel = 1, .reset_gpio_num = EXAMPLE_PIN_NUM_RST, }; ESP_ERROR_CHECK(esp_lcd_new_panel_ssd1306(io_handle, &panel_config, &panel_handle)); ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_handle)); ESP_ERROR_CHECK(esp_lcd_panel_init(panel_handle)); ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(panel_handle, true)); ESP_LOGI(TAG, "Initialize LVGL library"); lv_init(); // alloc draw buffers used by LVGL // it's recommended to choose the size of the draw buffer(s) to be at least 1/10 screen sized lv_color_t *buf1 = malloc(EXAMPLE_LCD_H_RES * 20 * sizeof(lv_color_t)); assert(buf1); lv_color_t *buf2 = malloc(EXAMPLE_LCD_H_RES * 20 * sizeof(lv_color_t)); assert(buf2); // initialize LVGL draw buffers lv_disp_draw_buf_init(&disp_buf, buf1, buf2, EXAMPLE_LCD_H_RES * 20); 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; disp_drv.rounder_cb = example_lvgl_rounder; disp_drv.set_px_cb = example_lvgl_set_px_cb; 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 Scroll Text"); 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(); } }