ESP LCD Touch GT1151 Controller

Implementation of the GT1151 touch controller with esp_lcd_touch component.

Add to project

Packages from this repository are uploaded to Espressif's component service. You can add them to your project via idf.py add-dependancy, e.g.

    idf.py add-dependency esp_lcd_touch_gt1151==1.0.0

Alternatively, you can create idf_component.yml. More is in Espressif's documentation.

Example use

Initialization of the touch component.

    esp_lcd_panel_io_i2c_config_t io_config = ESP_LCD_TOUCH_IO_I2C_GT1151_CONFIG();

    esp_lcd_touch_config_t tp_cfg = {
        .x_max = CONFIG_LCD_HRES,
        .y_max = CONFIG_LCD_VRES,
        .rst_gpio_num = -1,
        .int_gpio_num = -1,
        .levels = {
            .reset = 0,
            .interrupt = 0,
        },
        .flags = {
            .swap_xy = 0,
            .mirror_x = 0,
            .mirror_y = 0,
        },
    };

    esp_lcd_touch_handle_t tp;
    esp_lcd_touch_new_i2c_gt1151(io_handle, &tp_cfg, &tp);

Read data from the touch controller and store it in RAM memory. It should be called regularly in poll.

    esp_lcd_touch_read_data(tp);

Get one X and Y coordinates with strength of touch.

    uint16_t touch_x[1];
    uint16_t touch_y[1];
    uint16_t touch_strength[1];
    uint8_t touch_cnt = 0;

    bool touchpad_pressed = esp_lcd_touch_get_coordinates(tp, touch_x, touch_y, touch_strength, &touch_cnt, 1);