Help with UNIT IR and NanoC6 in Uiflow2

HybridZach

Hi. I usually use M5 products with esphome. I an completely novice with UIflow2 and mycropython. I would like some help using the unit IR to decode a ac remote. I followed the video example on m5docs, and I have an error.

Here is the code:

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(data)


def setup():
  global ir_0, data, addr

  M5.begin()
  ir_0 = IRUnit((1, 2))
  ir_0.rx_cb(ir_0_rx_event)
  data = 0
  addr = 27


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")

I get error:

Traceback (most recent call last):
  File "<stdin>", line 25, in <module>
  File "<stdin>", line 17, 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

The only thing that is different from the YouTube video is instead of setting a label to print the data value I am printing it to console, could this be the problem?

yuyun2000

The "invalid Timer number" error occurs because the IRUnit is trying to use a hardware timer that's either unavailable or already in use on your M5 device. ESP32-based boards have limited hardware timers (usually 4, IDs 0-3), and the default timer allocation in the IR library might conflict with other system functions.
Solution:Explicitly specify a valid timer ID when initializing the IRUnit. Modify your setup code to include the timer_id parameter with a value between 0-3:
ir_0 = IRUnit((1, 2), timer_id=1) # Try timer IDs 0, 1, 2, or 3

Troubleshooting Tips:

Test different timer IDs (0-3) if the first attempt fails
Ensure no other libraries/features are using the same timer (e.g., PWM, other sensors)
Verify your M5 device's firmware is up-to-date via UIFlow2

https://chat.m5stack.com/

HybridZach

@yuyun2000

Traceback (most recent call last):
  File "<stdin>", line 25, in <module>
  File "<stdin>", line 16, in setup
TypeError: unexpected keyword argument 'timer_id'

Vortrax

@HybridZach

New M5Stack user here..I encountered the same problem with a CoreS3 and getting the same "invalid timer number" error messages when trying to configure the IR Unit. The S3 was reflashed to UIFlow 2.3.3, but this did not resolve the problem.

yuyun2000's helpful suggestion didn't work either as timer_id does not appear to be in the constructor for the IRUnit. Is this a more fundamental software problem?

The IR Unit with UIFlow2 is completely unusable at the moment