Hi everybody,
I am currently working on a new project using LVGL 9.2 on an STM32U5G9 development board.
I am using a framebuffer, 2DDMA and the LTDC driver. The display driver is fast enough for my use cases. I have now added the touch driver for the GT911 touch display. I have also connected it to the LVGL touch backend.
The touch driver runs with I2C in polling mode at 100 MHz. However, only a few bytes are sent and received when a request is made. So the Blocking mode shouldn’t be a issue. The touch display is also only handled if an interrupt from the GT911 is registered.
static void gt911_touchpad_read(lv_indev_t *drv, lv_indev_data_t *data)
{
if (GT911Driver_handler(>911State) == true)
{
data->point.x = GT911State.TouchX;
data->point.y = GT911State.TouchY;
data->state = LV_INDEV_STATE_PR;
}
else
{
data->state = LV_INDEV_STATE_REL;
}
data->continue_reading = false;
}
// Init Touchdriver
GT911Driver_init();
lv_indev_t *indev = lv_indev_create();
lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
lv_indev_set_read_cb(indev, gt911_touchpad_read);
My Touchpads “Icons” are getting messed up whenever I press the them.
Befor Pressing:
After Pressing:
The GT911Driver_handler() runs in Blocking mode so this might be the issue. Do you have any experience with this?
Any help is greatly appreciated.