gt911 — Touch Screen Driver

Basic polling mode example usage:

import time
from gt911 import GT911
from machine import I2C
# Note use pin numbers or names not Pin objects because the
# driver needs to change pin directions to reset the controller.
touch = GT911(I2C(1, freq=400_000), reset_pin="P1", irq_pin="P2", touch_points=5)
while True:
   n, points = touch.read_points()
   for i in range(0, n):
      print(f"id {points[i][3]} x {points[i][0]} y {points[i][1]} size {points[i][2]}")


class gt911.GT911(bus, reset_pin, irq_pin[, address=0x5D[, width=800[, height=480[, touch_points=1[, reserve_x=False[, reserve_y=False[, reverse_axis=True[, stio=True[, refresh_rate=240[, touch_callback=None]]]]]]]]]])

Creates a touch screen controller object. You should initialize it according to the example above.


GT911._read_reg(reg[, size=1[, buf=None]])

Reads a register value.

GT911._write_reg(reg, val[, size=1])

Writes a register value.


Returns the ID of the gt911 chip.


Returns a tuple containing the count of points an array of point tuples. Each point tuple has an x[0], y[1], size[2], and id[3]. x/y are the position on screen. Size is the amount of pressure applied. And id is a unique id per point which should correlate to the same point over reads.


Resets the gt911 chip.