Hi,
I'm using Python 3.5.1 with PyUSB 1.0 under Win 10 (64). We try to read
the USB output of a DMM 'UT61B'.
import usb.core
import usb.util
import usb.backend.libusb1
def Gosub():
dev = usb.core.find(idVendor=0x1a86, idProduct=0xe008) # Digital
Multimeter UT61B
if dev == None:
print ('Multimeter not found')
else:
print ('Multimeter was found')
dev.set_configuration()
cfg = dev.get_active_configuration()
intf = cfg[(0,0)]
ep = usb.util.find_descriptor(
intf,
custom_match = \
lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_IN)
if ep == None:
print ('ep is None')
else:
s = ep.read(64, 500)
print ('Len s: ' + len(s))
print ('Starting')
Gosub()
print ('Ready.-')
Result:
File "d:\work-d\PythonProgs\ut61b.py", line 27, in <module>
Gosub()
File "d:\work-d\PythonProgs\ut61b.py", line 23, in Gosub
s = ep.read(64, 500)
File "D:\Python3\Lib\site-packages\usb\core.py", line 402, in read
return self.device.read(self, size_or_buffer, timeout)
File "D:\Python3\Lib\site-packages\usb\core.py", line 988, in read
self.__get_timeout(timeout))
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 851, in
intr_read
timeout)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 936, in
__read
_check(retval)
File "D:\Python3\Lib\site-packages\usb\backend\libusb1.py", line 595, in
_check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 10060] Operation timed out
What's wrong? How to fix?
Regards -- Joe
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