martinberlin/touch_tma445

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# ESP LCD Touch TMA445 Cypress Controller

Experimental touch reverse engineered from [Android Cypress touch driver](https://github.com/esno/linux-kindle-pw2/tree/amazon-3.0.y/drivers/input/touchscreen).

## Example use

Initialization of the touch component.

```
    esp_lcd_panel_io_i2c_config_t io_config = ESP_LCD_TOUCH_IO_I2C_TMA445_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_tma445(io_config, &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);
```

This touch driver was developed by Martin Fasani with the help of [Dario](https://github.com/ddB0515). He provided the key aspects for bootstrapping the device and help in understanding the original Linux driver.