IR Unit error when initializing receiver callback.

[vincebusam]

When adding a callback for IRUnit, the following error occurs:

Traceback (most recent call last):
  File "<stdin>", line 115, in <module>
  File "<stdin>", line 60, in setup
  File "unit/ir.py", line 24, in rx_cb
  File "driver/ir/nec.py", line 116, in __init__
  File "driver/ir/nec.py", line 67, in __init__
  File "driver/ir/receiver.py", line 47, in __init__
ValueError: invalid Timer number

This is due to

uiflow-micropython/m5stack/libs/driver/ir/receiver.py

Line 47 in 417a5f8

self.tim = Timer(-1) # Sofware timer

-1 is no longer a valid argument to Timer(). The caller must now pass in a valid timer.

Here is a basic UIKit2/micropython example

import os, sys, io
import M5
from M5 import *
from unit import IRUnit

ir_0 = None

data = None
addr = None

def ir_0_rx_event(_data, _addr, _ctrl):
  global ir_0, data, addr
  data = _data
  addr = _addr
  print('Got IR')
  print(f'0x{addr:00X}')
  print(f'0x{data:00X}')

def setup():
  global ir_0, data, addr

  M5.begin()
  Widgets.fillScreen(0x000000)

  ir_0 = IRUnit((1, 2))
  ir_0.rx_cb(ir_0_rx_event)

def loop():
  global ir_0, data, addr
  M5.update()

if __name__ == '__main__':
  try:
    setup()
    while True:
      loop()
  except (Exception, KeyboardInterrupt) as e:
    try:
      from utility import print_error_msg
      print_error_msg(e)
    except ImportError:
      print("please update to latest firmware")

[vincebusam]

#80

I suggest importing the rest of the https://github.com/peterhinch/micropython_ir repo to allow easier decoding of other IR protocols.