Add option for IRQ pin to wait for _read

[kmatch98]

This is to help resolve crashes during writes/reads, from issue.

I added a connection to the IRQ pin of the (TFT display breakout) and polling it before the write cycle, and that seems to resolve the issue.

Here's the updated setup in my code.py file:

print("Setting up I2C...")

i2c = busio.I2C(board.IO42, board.IO41)
irq = DigitalInOut(board.IO39)
irq.direction = Direction.INPUT
ft = adafruit_focaltouch.Adafruit_FocalTouch(i2c, debug=False, irq_pin = irq)

Here's my code change to the FocalTouch library. I add an irq_pin in the initialization. Then in the _read I wait for the irq_pin to go low before sending the write command.

One issue: I had to eliminate the need to check for IRQ during initialization, because the display would hang in the Adafruit_FocalTouch.__init__ function while waiting for a touch interrupt. So, I ignore the interrupt in the init function, but require it for all other reads.

[ladyada]

can ya add an example?

[kmatch98]

Yep, added.

[ladyada]

thanx!