Calibration page

[rzeldent]

Add a default calibration page

[olivluca]

Meanwhile you could add some logging to get the raw coordinates, that's what I did (I used log_e since I didn't want to change the log level)

#ifdef BOARD_HAS_TOUCH
// See: https://www.maximintegrated.com/en/design/technical-documents/app-notes/5/5296.html
void lvgl_touch_calibration_transform(lv_indev_drv_t *disp_drv, lv_indev_data_t *data)
{
  log_v("disp_drv:0x%08x, data:0x%08x", disp_drv, data);

  // Call low level read from the driver
  driver_touch_read_cb(disp_drv, data);
  if (data->state == LV_INDEV_STATE_PRESSED) {
    log_e("-------- raw x %d raw y %d",data->point.x,data->point.y);
  }

then I used those value to set the calibration data (using touch_calibration_data=smartdisplay_compute_touch_calibration(screen,touch);)