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

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Dear ladies and gents, evening.

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.

    raise USBError(errmsg, ret)

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'

Is this error known? If so is there a "fix" and "What is it?"

Any assistance would be gratefully received, as this is an annoying problem
that I desperately need help to fix.

Many thanks

Greg

PS Code and output presented below.

#!/usr/bin/python

import usb.core
import usb.util
import time

# find our device
dev = usb.core.find(idVendor=0x04d8, idProduct=0x01a5)

# was it found?
if dev is None:
    raise ValueError('Device not found %s')

print (dev)
dev.set_configuration()

cfg=dev[0]
intf=cfg[(0,0)]
ep=intf[0]

#print("print ep")
#print(ep)
#print("print cfg")
#print(cfg)
#print("print intf")
#print(intf)

out_ep_address = ep.bEndpointAddress

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)

C:\Users\User\AppData\Local\Programs\Python\Python36-32\python.exe
"C:/Users/User/Dropbox (Personal)/PyUSB/PyPIC 1.py"

DEVICE ID 04d8:01a5 on Bus 000 Address 001 =================

bLength                :   0x12 (18 bytes)

bDescriptorType        :    0x1 Device

bcdUSB                 :  0x200 USB 2.0

bDeviceClass           :    0x0 Specified at interface

bDeviceSubClass        :    0x0

bDeviceProtocol        :    0x0

bMaxPacketSize0        :    0x8 (8 bytes)

idVendor               : 0x04d8

idProduct              : 0x01a5

bcdDevice              :    0x1 Device 0.01

iManufacturer          :    0x1 DIY Devices

iProduct               :    0x2 16F1455 Generic HID Device

iSerialNumber          :    0x0 

 bNumConfigurations     :    0x1

  CONFIGURATION 1: 100 mA ==================================

   bLength              :    0x9 (9 bytes)

   bDescriptorType      :    0x2 Configuration

   wTotalLength         :   0x29 (41 bytes)

   bNumInterfaces       :    0x1

   bConfigurationValue  :    0x1

   iConfiguration       :    0x0 

   bmAttributes         :   0xa0 Bus Powered, Remote Wakeup

   bMaxPower            :   0x32 (100 mA)

    INTERFACE 0: Human Interface Device ====================

     bLength            :    0x9 (9 bytes)

     bDescriptorType    :    0x4 Interface

     bInterfaceNumber   :    0x0

     bAlternateSetting  :    0x0

     bNumEndpoints      :    0x2

     bInterfaceClass    :    0x3 Human Interface Device

     bInterfaceSubClass :    0x0

     bInterfaceProtocol :    0x0

     iInterface         :    0x0 

      ENDPOINT 0x81: Interrupt IN ==========================

       bLength          :    0x7 (7 bytes)

       bDescriptorType  :    0x5 Endpoint

       bEndpointAddress :   0x81 IN

       bmAttributes     :    0x3 Interrupt

       wMaxPacketSize   :    0x8 (8 bytes)

       bInterval        :    0x1

      ENDPOINT 0x1: Interrupt OUT ==========================

       bLength          :    0x7 (7 bytes)

       bDescriptorType  :    0x5 Endpoint

       bEndpointAddress :    0x1 OUT

       bmAttributes     :    0x3 Interrupt

       wMaxPacketSize   :    0x8 (8 bytes)

       bInterval        :    0x1

ep.bEndpointAddress = 129

array('B', [128, 0, 1, 1, 5, 6, 7, 8])

array('B', [128, 0, 0, 2, 6, 7, 8, 9])

array('B', [128, 0, 1, 3, 7, 8, 9, 10])

array('B', [128, 0, 0, 4, 8, 9, 10, 11])

array('B', [128, 0, 1, 5, 9, 10, 11, 12])

array('B', [128, 0, 0, 6, 10, 11, 12, 13])

array('B', [128, 0, 1, 7, 11, 12, 13, 14])

array('B', [128, 0, 0, 8, 12, 13, 14, 15])

array('B', [128, 0, 1, 9, 13, 14, 15, 16])

Traceback (most recent call last):

  File "C:/Users/User/Dropbox (Personal)/PyUSB/PyPIC 1.py", line 48, in
<module>

    test = dev.read(0x81, 8)

  File
"C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\u
sb\core.py", line 988, in read

    self.__get_timeout(timeout))

  File
"C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\u
sb\backend\libusb0.py", line 560, in intr_read

    timeout)

  File
"C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\u
sb\backend\libusb0.py", line 627, in __read

    timeout

  File
"C:\Users\User\AppData\Local\Programs\Python\Python36-32\lib\site-packages\u
sb\backend\libusb0.py", line 431, in _check

    raise USBError(errmsg, ret)

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'

Process finished with exit code 1

Regards

Greg

Dr Greg Horler

07764 191965