238 lines
8.2 KiB
C++
238 lines
8.2 KiB
C++
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/*
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* SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: CC0-1.0
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*/
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#include <cstdio>
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#include <unistd.h>
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#include <sys/lock.h>
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#include "main.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_timer.h"
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#include "esp_lcd_panel_io.h"
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#include "esp_lcd_panel_ops.h"
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#include "esp_err.h"
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#include "esp_log.h"
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#include "driver/i2c_master.h"
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#include "lvgl.h"
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#include "esp_lcd_panel_vendor.h"
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#define I2C_BUS_PORT 0
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#define LVGL_TICK_PERIOD_MS 5
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#define LVGL_TASK_STACK_SIZE (4 * 1024)
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#define LVGL_TASK_PRIORITY 2
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#define LVGL_PALETTE_SIZE 8
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static const char *TAG = "lcd-panel";
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// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
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// According to SSD1306 datasheet
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// Bit number used to represent command and parameter
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#define SCREEN_WIDTH 128 // OLED display width, in pixels
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#define SCREEN_HEIGHT 64 // OLED display height, in pixels
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#define LCD_H_RES SCREEN_WIDTH
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#define LCD_V_RES SCREEN_HEIGHT
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#define I2C_HW_ADDR 0x3C
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#define LCD_PIXEL_CLOCK_HZ (400 * 1000)
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#define LCD_CMD_BITS 8
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#define LCD_PARAM_BITS 8
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// Pin may vary based on your schematic
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#define PIN_SDA GPIO_NUM_21
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#define PIN_SCL GPIO_NUM_22
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#define PIN_RST -1
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// To use LV_COLOR_FORMAT_I1, we need an extra buffer to hold the converted data
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static uint8_t oled_buffer[LCD_H_RES * LCD_V_RES / 8];
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// LVGL library is not thread-safe, this example will call LVGL APIs from different tasks, so use a mutex to protect it
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static _lock_t lvgl_api_lock;
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static bool example_notify_lvgl_flush_ready(esp_lcd_panel_io_handle_t io_panel,
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esp_lcd_panel_io_event_data_t *edata,
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void *user_ctx)
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{
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auto *disp = (lv_display_t *) user_ctx;
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lv_display_flush_ready(disp);
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return false;
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}
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static void example_lvgl_flush_cb(lv_display_t *disp, const lv_area_t *area,
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uint8_t *px_map)
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{
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auto panel_handle = (esp_lcd_panel_handle_t) lv_display_get_user_data(disp);
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// This is necessary because LVGL reserves 2 x 4 bytes in the buffer, as these are assumed to be used as a palette. Skip the palette here
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// More information about the monochrome, please refer to https://docs.lvgl.io/9.2/porting/display.html#monochrome-displays
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px_map += LVGL_PALETTE_SIZE;
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uint16_t hor_res = lv_display_get_physical_horizontal_resolution(disp);
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int x1 = area->x1;
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int x2 = area->x2;
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int y1 = area->y1;
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int y2 = area->y2;
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for (int y = y1; y <= y2; y++) {
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for (int x = x1; x <= x2; x++) {
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/* The order of bits is MSB first
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MSB LSB
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bits 7 6 5 4 3 2 1 0
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pixels 0 1 2 3 4 5 6 7
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Left Right
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*/
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bool chroma_color = (px_map[(hor_res >> 3) * y + (x >> 3)] &
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1 << (7 - x % 8));
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/* Write to the buffer as required for the display.
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* It writes only 1-bit for monochrome displays mapped vertically.*/
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uint8_t *buf = oled_buffer + hor_res * (y >> 3) + (x);
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if (chroma_color) {
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(*buf) &= ~(1 << (y % 8));
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} else {
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(*buf) |= (1 << (y % 8));
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}
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}
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}
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// pass the draw buffer to the driver
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ESP_ERROR_CHECK(
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esp_lcd_panel_draw_bitmap(panel_handle, x1, y1, x2 + 1, y2 + 1,
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oled_buffer));
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}
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static void example_increase_lvgl_tick(void *arg)
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{
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/* Tell LVGL how many milliseconds has elapsed */
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lv_tick_inc(LVGL_TICK_PERIOD_MS);
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}
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static void example_lvgl_port_task(void *arg)
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{
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ESP_LOGI(TAG, "Starting LVGL task");
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uint32_t time_till_next_ms = 0;
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while (1) {
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_lock_acquire(&lvgl_api_lock);
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time_till_next_ms = lv_timer_handler();
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_lock_release(&lvgl_api_lock);
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usleep(1000 * time_till_next_ms);
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}
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}
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void setup()
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{
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ESP_LOGI(TAG, "Initialize I2C bus");
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i2c_master_bus_handle_t i2c_bus = nullptr;
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i2c_master_bus_config_t bus_config = {
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.i2c_port = I2C_BUS_PORT,
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.sda_io_num = PIN_SDA,
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.scl_io_num = PIN_SCL,
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.clk_source = I2C_CLK_SRC_DEFAULT,
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.glitch_ignore_cnt = 7,
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.flags {
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.enable_internal_pullup = true,
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},
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};
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ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, &i2c_bus));
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ESP_LOGI(TAG, "Install panel IO");
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esp_lcd_panel_io_handle_t io_handle = nullptr;
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esp_lcd_panel_io_i2c_config_t io_config = {
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.dev_addr = I2C_HW_ADDR,
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.control_phase_bytes = 1, // According to SSD1306 datasheet
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.dc_bit_offset = 6, // According to SSD1306 datasheet
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.lcd_cmd_bits = LCD_CMD_BITS, // According to SSD1306 datasheet
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.lcd_param_bits = LCD_CMD_BITS, // According to SSD1306 datasheet
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.scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
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};
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ESP_ERROR_CHECK(esp_lcd_new_panel_io_i2c(i2c_bus, &io_config, &io_handle));
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ESP_LOGI(TAG, "Install SSD1306 panel driver");
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esp_lcd_panel_handle_t panel_handle = nullptr;
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esp_lcd_panel_dev_config_t panel_config = {
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.reset_gpio_num = PIN_RST,
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.bits_per_pixel = 1,
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};
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esp_lcd_panel_ssd1306_config_t ssd1306_config = {
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.height = LCD_V_RES,
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};
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panel_config.vendor_config = &ssd1306_config;
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ESP_ERROR_CHECK(
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esp_lcd_new_panel_ssd1306(io_handle, &panel_config, &panel_handle));
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ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_handle));
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ESP_ERROR_CHECK(esp_lcd_panel_init(panel_handle));
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ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(panel_handle, true));
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ESP_LOGI(TAG, "Initialize LVGL");
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lv_init();
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// create a lvgl display
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lv_display_t *display = lv_display_create(LCD_H_RES, LCD_V_RES);
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// associate the i2c panel handle to the display
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lv_display_set_user_data(display, panel_handle);
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// create draw buffer
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void *buf = nullptr;
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ESP_LOGI(TAG, "Allocate separate LVGL draw buffers");
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// LVGL reserves 2 x 4 bytes in the buffer, as these are assumed to be used as a palette.
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size_t draw_buffer_sz = LCD_H_RES * LCD_V_RES / 8 + LVGL_PALETTE_SIZE;
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buf = heap_caps_calloc(1, draw_buffer_sz,
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MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
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assert(buf);
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// LVGL9 suooprt new monochromatic format.
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lv_display_set_color_format(display, LV_COLOR_FORMAT_I1);
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// initialize LVGL draw buffers
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lv_display_set_buffers(display, buf, nullptr, draw_buffer_sz,
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LV_DISPLAY_RENDER_MODE_FULL);
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lv_display_set_rotation(display, LV_DISPLAY_ROTATION_90);
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// set the callback which can copy the rendered image to an area of the display
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lv_display_set_flush_cb(display, example_lvgl_flush_cb);
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ESP_LOGI(TAG,
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"Register io panel event callback for LVGL flush ready notification");
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const esp_lcd_panel_io_callbacks_t cbs = {
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.on_color_trans_done = example_notify_lvgl_flush_ready,
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};
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/* Register done callback */
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ESP_ERROR_CHECK(
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esp_lcd_panel_io_register_event_callbacks(io_handle, &cbs, display));
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ESP_LOGI(TAG, "Use esp_timer as LVGL tick timer");
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const esp_timer_create_args_t lvgl_tick_timer_args = {
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.callback = &example_increase_lvgl_tick,
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.name = "lvgl_tick"
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};
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esp_timer_handle_t lvgl_tick_timer = nullptr;
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ESP_ERROR_CHECK(esp_timer_create(&lvgl_tick_timer_args, &lvgl_tick_timer));
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ESP_ERROR_CHECK(esp_timer_start_periodic(lvgl_tick_timer,
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LVGL_TICK_PERIOD_MS * 1000));
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ESP_LOGI(TAG, "Create LVGL task");
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xTaskCreate(example_lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE,
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nullptr, LVGL_TASK_PRIORITY, nullptr);
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ESP_LOGI(TAG, "Display LVGL Scroll Text");
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// Lock the mutex due to the LVGL APIs are not thread-safe
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_lock_acquire(&lvgl_api_lock);
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// UI function
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{
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lv_obj_t *scr = lv_display_get_screen_active(display);
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lv_obj_t *label = lv_label_create(scr);
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// Circular scroll
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lv_label_set_long_mode(label,
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LV_LABEL_LONG_WRAP);
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lv_label_set_text(label,
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"Hello hello hello hello hello hello hello hello.");
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// Size of the screen
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// if you use rotation 90 or 270 use lv_display_get_vertical_resolution
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lv_obj_set_width(label, lv_display_get_horizontal_resolution(display));
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lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 0);
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}
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_lock_release(&lvgl_api_lock);
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}
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void loop() { }
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