Add example with interrupt (IRQ)

Author: kmatch98

examples/focaltouch_print_touches_with_irq.py

@@ -0,0 +1,47 @@
+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+"""
+Example for getting touch data from an FT6206 or FT6236 capacitive
+touch driver, over I2C.  This version uses an interrupt to prevent
+read errors from the FocalTouch chip.
+"""
+
+import time
+import busio
+import board
+from digitalio import DigitalInOut, Direction
+import adafruit_focaltouch
+
+
+if hasattr(
+    board, "SCL"
+):  # if SCL and SDA pins are defined by the board definition, use them.
+    SCL_pin = board.SCL
+    SDA_pin = board.SDA
+else:
+    SCL_pin = board.IO42  # set to a pin that you want to use for SCL
+    SDA_pin = board.IO41  # set to a pin that you want to use for SDA
+
+IRQ_pin = board.IO39  # select a pin to connect to the display's interrupt pin ("IRQ")
+
+i2c = busio.I2C(SCL_pin, SDA_pin)
+
+# Setup the interrupt (IRQ) pin for input
+irq = DigitalInOut(board.IO39)
+irq.direction = Direction.INPUT
+
+# Create library object (named "ft") using a Bus I2C port and using an interrupt pin (IRQ)
+ft = adafruit_focaltouch.Adafruit_FocalTouch(i2c, debug=False, irq_pin=irq)
+
+
+print("\n\nReady for touches...")
+
+while True:
+    # if the screen is being touched print the touches
+    if ft.touched:
+        print(ft.touches)
+    else:
+        print("no touch")
+
+    time.sleep(0.05)