2.2 KiB
2.2 KiB
ESP LCD Touch CST9217 Controller
Implementation of the CST9217 touch controller with esp_lcd_touch component.
| Touch controller | Communication interface | Component name | Link to datasheet |
|---|---|---|---|
| CST9217 | I2C | esp_lcd_touch_cst9217 | WIKI |
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_cst9217==0.0.1
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_CST9217_CONFIG();
esp_lcd_touch_io_cst9217_config_t tp_cst9217_config = {
.dev_addr = io_config.dev_addr,
};
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,
},
.driver_data = &tp_cst9217_config,
};
esp_lcd_touch_handle_t tp;
esp_lcd_touch_new_i2c_cst9217(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);