trezor-firmware/embed/trezorhal/touch_1.h

#define BTN_PIN_LEFT GPIO_PIN_5
#define BTN_PIN_RIGHT GPIO_PIN_2

#define DISPLAY_RESX 128
#define DISPLAY_RESY 64
#define BTN_LEFT_COORDS touch_pack_xy(0, DISPLAY_RESY - 1)
#define BTN_RIGHT_COORDS touch_pack_xy(DISPLAY_RESX - 1, DISPLAY_RESY - 1)

void touch_init(void) {
  __HAL_RCC_GPIOC_CLK_ENABLE();

  GPIO_InitTypeDef GPIO_InitStructure;

  // PC4 capacitive touch panel module (CTPM) interrupt (INT) input
  GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
  GPIO_InitStructure.Pull = GPIO_PULLUP;
  GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStructure.Pin = BTN_PIN_LEFT | BTN_PIN_RIGHT;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void touch_power_on(void) {}

void touch_power_off(void) {}

void touch_sensitivity(uint8_t value) { (void)value; }

uint32_t touch_read(void) {
  static char last_left = 0, last_right = 0;
  char left = (GPIO_PIN_RESET == HAL_GPIO_ReadPin(GPIOC, BTN_PIN_LEFT));
  char right = (GPIO_PIN_RESET == HAL_GPIO_ReadPin(GPIOC, BTN_PIN_RIGHT));
  if (last_left != left) {
    last_left = left;
    if (left) {
      return TOUCH_START | BTN_LEFT_COORDS;
    } else {
      return TOUCH_END | BTN_LEFT_COORDS;
    }
  }
  if (last_right != right) {
    last_right = right;
    if (right) {
      return TOUCH_START | BTN_RIGHT_COORDS;
    } else {
      return TOUCH_END | BTN_RIGHT_COORDS;
    }
  }
  return 0;
}

uint32_t touch_is_detected(void) {
  return (GPIO_PIN_RESET == HAL_GPIO_ReadPin(GPIOC, BTN_PIN_LEFT)) ||
         (GPIO_PIN_RESET == HAL_GPIO_ReadPin(GPIOC, BTN_PIN_RIGHT));
}