How Can I Know What Exactly is Causing USB Errors

General Discussion
1 
USB Error: [Errno 16] Resource busy

I have been reading. I do not know how to pinpoint this error in general.

I can and will add a delay. This may be it. I can and will try to release via source the endpoint.

Well, all have been tried. No success yet.

I can always try more power too.

options are dwindling for now. I started an issue on github for pyusb.

Would I need a udev rule?

Here is the issue: Some Unknown Error to Me/Linux OS Debian Trixie · Issue #551 · pyusb/pyusb · GitHub

2

For some additional details:

# ValueError: Invalid endpoint address 0x1
dev.write(1, [command, channel, low_bits, high_bits])

The 1 in the command gets turned into a hexadecimal value like with the ValueError:.

Python3 does not allow for leading 0 values. The funny thing, sort of a stresser, is that the code below is creating Resource busy errors when 1 is a command called command which is a hexadecimal value of 0x84.

See here:

    target_val = int(target_us * 4)
    command = 0x84
    low_bits = target_val & 0x7F
    high_bits = (target_val >> 7) & 0x7F
    try:
        dev.write(1, [command, channel, low_bits, high_bits])
    except usb.core.USBError as e:
        print(f"USB Error: {e}")

okay and doodles, it is late now.

3

pyserial over pyusb did the trick.