I use STM32F429 to transplant LVGL V7.11.0 version, using capacitive screen。now，The display is normal, but the touch is not normal。
Here is the transplantation part
static bool touchpad_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data)
{
static lv_coord_t last_x = 0;
static lv_coord_t last_y = 0;
GTP_TouchProcess();
/*Save the pressed coordinates and the state*/
if(touchpad_is_pressed()) {
data->state = LV_INDEV_STATE_PR;
} else {
data->state = LV_INDEV_STATE_REL;
}
touchpad_get_xy(&last_x, &last_y);
/*Set the last pressed coordinates*/
data->point.x = last_x;
data->point.y = last_y;
// printf("(last_x) = %d ,last_y = %d \r\n",data->point.x, data->point.y);
/*Return `false` because we are not buffering and no more data to read*/
return false;
}
I use the serial port to detect the touch value, it is displayed normally, and the value is also the correct value：
E.g：
(last_x) = 587 ,last_y = 284
Below is my function to test touch：
static void event_handler(lv_obj_t * obj, lv_event_t event)
{
printf("event = %d\r\n",event);
if(event == LV_EVENT_CLICKED) {
printf("Clicked\n");
}
else if(event == LV_EVENT_VALUE_CHANGED) {
printf("Toggled\n");
}
}
void lv_ex_btn_1(void)
{
lv_obj_t * label;
lv_obj_t * btn1 = lv_btn_create(lv_scr_act(), NULL);
lv_obj_set_event_cb(btn1, event_handler);
lv_obj_align(btn1, NULL, LV_ALIGN_CENTER, 0, -40);
label = lv_label_create(btn1, NULL);
lv_label_set_text(label, "Button");
lv_obj_t * btn2 = lv_btn_create(lv_scr_act(), NULL);
lv_obj_set_event_cb(btn2, event_handler);
lv_obj_align(btn2, NULL, LV_ALIGN_CENTER, 0, 40);
lv_btn_set_checkable(btn2, true);
lv_btn_toggle(btn2);
lv_btn_set_fit2(btn2, LV_FIT_NONE, LV_FIT_TIGHT);
label = lv_label_create(btn2, NULL);
lv_label_set_text(label, "Toggled");
}
Its touch event is wrong。
I found through the serial port monitoring that when the touch event is pressed, it is LV_EVENT_PRESSED。
When the key is released, the touch event is LV_EVENT_PRESSING。
In theory it should be LV_EVENT_CLICKED，LV_EVENT_RELEASED。
So, what caused it。（When touched, there are correct XY coordinate values）
