how can i connect a XPT2046 touchscreen to lvgl

[getznerh]

Hello all together! I admire your work on the topic of lvgl and micropython. I use a 4.3" ESp32S3 module (esp32-4827S043R) with a parallel inferface and have successfully compiled a firmware with rgb_display and generated a display_driver.py from your suggestion.

However, the module does not have the touchscreen connected via i2c and gt911, but via SPI and XPT2046. Although the touch interface works perfectly in a test program with this driver (sample from bdbarnet), I can't get it to work with indev = XPT2046() and the same SPI parameters.

Unfortunately, I fundamentally don't understand how the display driver and the indev driver are used or should be noticed from the lvgl framework. In the examples we only created one instance of display_drv and indev. Is that enough?

I compile the firmware with:
python3 make.py esp32 mpy_cross submodules clean BOARD=ESP32_GENERIC_S3 BOARD_VARIANT=SPIRAM_OCT DISPLAY=rgb_display INDEV=xpt2046

in the display_driver I have replaced

#
# import time # NOQA
# import gt911 # NOQA
#
# indev = gt911.GT911(I2C_BUS)

through

# from https://github.com/rzeldent/platformio-espressif32-sunton/blob/main/esp32-4827S043R.json
# "'-D XPT2046_SPI_BUS_MOSI_IO_NUM=11'",
# "'-D XPT2046_SPI_BUS_MISO_IO_NUM=13'",
# "'-D XPT2046_SPI_BUS_SCLK_IO_NUM=12'",
# "'-D XPT2046_SPI_CONFIG_CS_GPIO_NUM=38'",
# the board has NO connection for INT! and so no callback
# the testprogram works with this parameters and  x, y = touch.raw_touch()
# spi2 = SPI(1, baudrate=1000000, sck=Pin(12), mosi=Pin(11), miso=Pin(13))
# touch = Touch(spi2, cs=Pin(38), int_pin=Pin(0),int_handler=touchscreen_press)

from xpt2046 import XPT2046
indev = XPT2046(miso=13,mosi=11,clk=12,cs=38,host=0,freq=1000000)

I have tried with different host values

A test program with buttons shows the buttons but does not respond to touch input.

Can you give me a hint about this? I thank you very much for your feedback
Regards Hans

[kdschlosser]

The host number you should be using is host 1. Host 0 is reserved for internal memory.
The frequency should be 2000000

[getznerh]

Hi Kevin, do not be upset! It is nearly midnight in Austria, my back is painful (i hope your back is OK again) and i will look tomorrow. Thank you for today! Regards Hans

[getznerh]

Before i go to sleep: i am very sorry, but exactly the same error.
I doublechecked i have the last version

    @property
    def top(self):
        if self._top == -0x80000000:
            return None

        return self._top
MicroPython v1.22.2-dirty on 2024-05-12; Generic ESP32S3 module with Octal-SPIRAM with ESP32S3
Type "help()" for more information.
>>> import newmain
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "newmain.py", line 129, in <module>
  File "pointer_framework.py", line 36, in calibrate
  File "touch_cal_data.py", line 98, in reset
  File "touch_cal_data.py", line 78, in top
OverflowError: overflow converting long int to machine word
>>>

good night!

[getznerh]

Hi! I just made a new try. (xpt2046 has changed)

MicroPython v1.22.2-dirty on 2024-05-13; Generic ESP32S3 module with Octal-SPIRAM with ESP32S3
Type "help()" for more information.
>>> import newmain
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "newmain.py", line 129, in <module>
  File "pointer_framework.py", line 36, in calibrate
  File "touch_cal_data.py", line 98, in reset
  File "touch_cal_data.py", line 78, in top
OverflowError: overflow converting long int to machine word
>>> Traceback (most recent call last):
  File "task_handler.py", line 135, in _task_handler
  File "pointer_framework.py", line 55, in _read
  File "xpt2046.py", line 109, in _get_coords
  File "xpt2046.py", line 97, in _read_reg
ValueError: buffers must be the same length

[kdschlosser]

I am going to have to figure out what I am able to set the value to for the NVS so it doesn't error out. I will either have to do that by trial and error or I am going to have to go digging into the code for micropython to see what the data type is that it is using...

[kdschlosser]

Thank you for asking about my back. While my back wasn't really where the pain was it was what was causing the pain to happen. It was my right leg that was in pain. After surgery my leg doesn't hurt anymore but now my back does. It doesn't hurt where the operation was, it hurts up higher in my middle back.. Can't win.

[ChangJiahong]

Pls is this issue solved now? I tried to use xpt2046 and I did the calibration procedure, and found that the click did not respond, I checked the source code and found that it seems that the click event was not registered for him, how do I modify the program to go to the calibration screen