xiaozhi-esp32/main/Display.cc

#include "Display.h"

#include <esp_log.h>
#include <esp_err.h>
#include <esp_lcd_panel_ops.h>
#include <esp_lcd_panel_vendor.h>
#include <esp_lvgl_port.h>
#include <string>
#include <cstdlib>

#define TAG "Display"

#ifdef CONFIG_USE_DISPLAY

Display::Display(int sda_pin, int scl_pin) : sda_pin_(sda_pin), scl_pin_(scl_pin) {
    ESP_LOGI(TAG, "Display Pins: %d, %d", sda_pin_, scl_pin_);

    i2c_master_bus_config_t bus_config = {
        .i2c_port = I2C_NUM_0,
        .sda_io_num = (gpio_num_t)sda_pin_,
        .scl_io_num = (gpio_num_t)scl_pin_,
        .clk_source = I2C_CLK_SRC_DEFAULT,
        .glitch_ignore_cnt = 7,
        .intr_priority = 1,
        .trans_queue_depth = 0,
        .flags = {
            .enable_internal_pullup = 1,
        },
    };

    ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, &i2c_bus_));

    // SSD1306 config
    esp_lcd_panel_io_i2c_config_t io_config = {
        .dev_addr = 0x3C,
        .on_color_trans_done = nullptr,
        .user_ctx = nullptr,
        .control_phase_bytes = 1,
        .dc_bit_offset = 6,
        .lcd_cmd_bits = 8,
        .lcd_param_bits = 8,
        .flags = {
            .dc_low_on_data = 0,
            .disable_control_phase = 0,
        },
        .scl_speed_hz = 400 * 1000,
    };

    ESP_ERROR_CHECK(esp_lcd_new_panel_io_i2c_v2(i2c_bus_, &io_config, &panel_io_));

    ESP_LOGI(TAG, "Install SSD1306 driver");
    esp_lcd_panel_dev_config_t panel_config = {};
    panel_config.reset_gpio_num = -1;
    panel_config.bits_per_pixel = 1;

    esp_lcd_panel_ssd1306_config_t ssd1306_config = {
        .height = CONFIG_DISPLAY_HEIGHT
    };
    panel_config.vendor_config = &ssd1306_config;

    ESP_ERROR_CHECK(esp_lcd_new_panel_ssd1306(panel_io_, &panel_config, &panel_));
    ESP_LOGI(TAG, "SSD1306 driver installed");

    // Reset the display
    ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_));
    if (esp_lcd_panel_init(panel_) != ESP_OK) {
        ESP_LOGE(TAG, "Failed to initialize display");
        return;
    }

    ESP_LOGI(TAG, "Initialize LVGL");
    lvgl_port_cfg_t port_cfg = ESP_LVGL_PORT_INIT_CONFIG();
    lvgl_port_init(&port_cfg);

    const lvgl_port_display_cfg_t display_cfg = {
        .io_handle = panel_io_,
        .panel_handle = panel_,
        .buffer_size = 128 * CONFIG_DISPLAY_HEIGHT,
        .double_buffer = true,
        .hres = 128,
        .vres = CONFIG_DISPLAY_HEIGHT,
        .monochrome = true,
        .rotation = {
            .swap_xy = 0,
            .mirror_x = 0,
            .mirror_y = 0,
        },
        .flags = {
            .buff_dma = 0,
            .buff_spiram = 0,
        },
    };
    disp_ = lvgl_port_add_disp(&display_cfg);
    lv_disp_set_rotation(disp_, LV_DISP_ROT_180);

    // Set the display to on
    ESP_LOGI(TAG, "Turning display on");
    ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(panel_, true));
    
    ESP_LOGI(TAG, "Display Loading...");
    if (lvgl_port_lock(0)) {
        label_ = lv_label_create(lv_disp_get_scr_act(disp_));
        lv_label_set_text(label_, "Initializing...");
        lv_obj_set_width(label_, disp_->driver->hor_res);
        lv_obj_set_height(label_, disp_->driver->ver_res);
        lv_obj_set_style_text_line_space(label_, 0, 0);
        lv_obj_set_style_pad_all(label_, 0, 0);
        lv_obj_set_style_outline_pad(label_, 0, 0);
        lvgl_port_unlock();
    }
}

Display::~Display() {
    if (label_ != nullptr) {
        lvgl_port_lock(0);
        lv_obj_del(label_);
        lvgl_port_unlock();
    }

    if (disp_ != nullptr) {
        lvgl_port_deinit();
        esp_lcd_panel_del(panel_);
        esp_lcd_panel_io_del(panel_io_);
        i2c_master_bus_reset(i2c_bus_);
    }
}

void Display::SetText(const std::string &text) {
    if (label_ != nullptr) {
        text_ = text;
        lvgl_port_lock(0);
        // Change the text of the label
        lv_label_set_text(label_, text_.c_str());
        lvgl_port_unlock();
    }
}

#endif