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# ESP LCD Touch GT911 Controller
Implementation of the GT911 touch controller with esp_lcd_touch component.
| Touch controller | Communication interface | Component name | Link to datasheet |
| :--------------: | :---------------------: | :------------: | :---------------: |
| GT911 | I2C | esp_lcd_touch_gt911 | [WIKI](https://www.waveshare.com/wiki/7inch-Capacitive-Touch-LCD-C_Datasheets) |
## Add to project
Packages from this repository are uploaded to [Espressif's component service](https://components.espressif.com/).
You can add them to your project via `idf.py add-dependancy`, e.g.
```
idf.py add-dependency esp_lcd_touch_gt911==1.0.0
```
Alternatively, you can create `idf_component.yml`. More is in [Espressif's documentation](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-component-manager.html).
## Example use
Initialization of the touch component.
```
esp_lcd_panel_io_i2c_config_t io_config = ESP_LCD_TOUCH_IO_I2C_GT911_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_gt911(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_btn, &touch_cnt, 1);
```