Re: [pyusb-users] Help with ERROR please [usb.core.USBError: [Errno None] b'libusb0-dll:err [_usb_reap_async]

[Xiaofan C. <xia...@gm...>]

On Tue, Mar 7, 2017 at 5:33 AM, Greg Horler <dr....@gm...> wrote:
> I have had partial success in interfacing an 8-bit microcontroller with a PC
> running windows 10,Python and PyUsb.
>
> I am a firmware specialist, i.e. not particularly proficient in Python, I am
> new to PyUSB.
>
> The problem is that my python program fails periodically with the following
> error…
>...
> usb.core.USBError: [Errno None] b'libusb0-dll:err [_usb_reap_async] reaping
> request failed, win error: The I/O operation has been aborted because of
> either a thread exit or an application request.\r\n\n'
>
> print ("ep.bEndpointAddress = %s" %out_ep_address)
> #print(out_ep_address)
>
> while True:
>
>     dev.write(0x01, [0x81, 0x08, 0x08,0x03,0x04,0x05,0x06,0x07])
>     time.sleep(0.1)  # Sample (0.1)s == 1ms
>     test = dev.read(0x81, 8)
>     print (test)


Did you write the FW by yourself?

Since this is an HID device, are you using the libusb-win32 filter driver?
pyusb/libusb may not be the best thing to use for USB HID device.

Ref: https://github.com/libusb/libusb/wiki/FAQ#does-libusb-support-usb-hid-devices

If you need cross platform HID access, then you may need to
look at HIDAPI and its python binding.
   http://www.signal11.us/oss/hidapi/
   https://pypi.python.org/pypi/hidapi

If you only use Python and only care about Windows, you
may want to give pywinusb a try.
   https://pypi.python.org/pypi/pywinusb/



-- 
Xiaofan