XTP2046 unable to make it work

General discussion
1

Hi!,
I have a problem with XTP2046 driver, I always have the same error with
(i uses nucleo l476rg,Arduino IDE)

  indev_drv.read_cb = my_input_read

my includes

#include “Adafruit_GFX.h”
#include “Adafruit_ILI9341.h”
#include “lvgl.h”
#include <Wire.h>
#include “Adafruit_SPIDevice.h”
#include <XPT2046_Touchscreen.h>

bool my_input_read(lv_indev_drv_t * drv, lv_indev_data_t*data)
{
if (ts.touched()) {
TS_Point p = ts.getPoint();
x = map(p.x, 220, 3850, 1, 480);
y = map(p.y, 310, 3773, 1, 320);
data->point.x = x;
data->point.y = y;
data->state = LV_INDEV_STATE_PR;
} else {
data->state = LV_INDEV_STATE_REL;
}
return false; //No buffering now so no more data read//
}

and in the setup

lv_indev_drv_t indev_drv;
lv_indev_drv_register( &indev_drv );
indev_drv.type = LV_INDEV_TYPE_POINTER;
//indev_drv.read_cb = my_input_read; // ← Problem, commented compile
lv_indev_drv_register(&indev_drv);

and I have this error

error: invalid conversion from ‘bool ()(lv_indev_drv_t, lv_indev_data_t*)’ {aka ‘bool ()(_lv_indev_drv_t, lv_indev_data_t*)’} to ‘void ()(_lv_indev_drv_t, lv_indev_data_t*)’ [- fpermissive]

everything works except the touchscreen,

any help would be appreciated

Thanks in advance

2

Hello,

input read function should not return bool, but void (nothing).

Try making the return value void instead of bool.

void my_input_read(lv_indev_drv_t * drv, lv_indev_data_t*data)
{
if (ts.touched()) {
TS_Point p = ts.getPoint();
x = map(p.x, 220, 3850, 1, 480);
y = map(p.y, 310, 3773, 1, 320);
data->point.x = x;
data->point.y = y;
data->state = LV_INDEV_STATE_PR;
} else {
data->state = LV_INDEV_STATE_REL;
}
}
1 Like
3

Thanks Tinus,
Now Compile with your Solution, and added this :

static lv_disp_drv_t disp_drv; //added static ,forgotted…
lv_indev_drv_init(&indev_drv); //added ,seem to work whitout.

x = map(p.x, 220, 3850, 1, 320); //adjusted
y = map(p.y, 310, 3773, 1, 240); //adjusted

i ve tried your solution before,but forgot to remove

return false; //No buffering now so no more data read//

and Many Thanks Tinus,surely this will help Other People in a marvellous world of LGVL