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
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