GT911 CircuitPython driver, barely working.

gistfile1.txt

# SPDX-FileCopyrightText: 2017 Limor Fried for Adafruit Industries
#
# SPDX-License-Identifier: MIT

"""CircuitPython I2C Device Address Scan"""
# If you run this and it seems to hang, try manually unlocking
# your I2C bus from the REPL with
#  >>> import board
#  >>> board.I2C().unlock()

import time
import board
import busio
import adafruit_focaltouch

from adafruit_bus_device.i2c_device import I2CDevice

GT911_REG_ID = 0x8140

print("starting...")


# To use default I2C bus (most boards)
# i2c = board.I2C()  # uses board.SCL and board.SDA
# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller

# To create I2C bus on specific pins
# import busio
# i2c = busio.I2C(board.SCL1, board.SDA1)  # QT Py RP2040 STEMMA connector
# i2c = busio.I2C(board.GP1, board.GP0)    # Pi Pico RP2040
i2c = busio.I2C(board.IO18, board.IO17)

print("try lock")
while not i2c.try_lock():
    pass
print("locked")


# GT911_config= bytes([
#         0x42, 
#         0xD0, 0x02, 0x00, 0x05, 0x05, 0x75, 0x01, 0x01, 0x0F, 0x24, 
#         0x0F, 0x64, 0x3C, 0x03, 0x05, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 
#         0x00, 0x16, 0x19, 0x1C, 0x14, 0x8C, 0x0E, 0x0E, 0x24, 0x00, 0x31, 
#         0x0D, 0x00, 0x00, 0x00, 0x83, 0x33, 0x1D, 0x00, 0x41, 0x00, 0x00, 
#         0x00, 0x00, 0x00, 0x08, 0x0A, 0x00, 0x2B, 0x1C, 0x3C, 0x94, 0xD5, 
#         0x03, 0x08, 0x00, 0x00, 0x04, 0x93, 0x1E, 0x00, 0x82, 0x23, 0x00, 
#         0x74, 0x29, 0x00, 0x69, 0x2F, 0x00, 0x5F, 0x37, 0x00, 0x5F, 0x20, 
#         0x40, 0x60, 0x00, 0xF0, 0x40, 0x30, 0x55, 0x50, 0x27, 0x00, 0x00, 
#         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
#         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14, 0x19, 0x00, 0x00, 
#         0x50, 0x50, 0x02, 0x04, 0x06, 0x08, 0x0A, 0x0C, 0x0E, 0x10, 0x12, 
#         0x14, 0x16, 0x18, 0x1A, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
#         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1D, 
#         0x1E, 0x1F, 0x20, 0x21, 0x22, 0x24, 0x26, 0x28, 0x29, 0x2A, 0x1C, 
#         0x18, 0x16, 0x14, 0x13, 0x12, 0x10, 0x0F, 0x0C, 0x0A, 0x08, 0x06, 
#         0x04, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
#         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x9C, 0x01])


# print("send config")

# i2c.writeto(0x5D, GT911_config)
time.sleep(0.2)

while True:


	# i2c.writeto(0x5D, bytes([(0x80 & 0xFF), (0x40 & 0xFF), (0x00 & 0xFF)]))
	
	# print("write 50")

	touches = bytearray(1)
	i2c.writeto(0x5D, bytes([(0x81 & 0xFF), (0x4E & 0xFF)]))
	i2c.readfrom_into(0x5D, touches)
	# print("write 50")
	i2c.writeto(0x5D, bytes([(0x81 & 0xFF), (0x50 & 0xFF)]))
	# print("read")
	result = bytearray(4)
	i2c.readfrom_into(0x5D, result)

	i2c.writeto(0x5D, bytes([(0x81 & 0xFF), (0x4E & 0xFF), (0x00 & 0xFF)]))
	
	print("touches: {} x: {}, y: {}".format(touches[0] & 0x0F, (result[1] << 8) + result[0], (result[3] << 8) + result[2]))
	# print("")
	time.sleep(0.1)