问使用PyUSB从usb设备读取/写入时出现问题(超时)

EN

import usb.core
import usb.util
from usb.core import *
import sys
import os
import binascii
import time
import serial    
import itertools


idV = 0x2abf
idP = 0x0505

# doesnt seem to write anything to log?!
os.environ['PYUSB_DEBUG'] = 'debug'
#os.environ['PYUSB_LOG_FILENAME'] = "pyusb.log" #never written


print "finding idVendor = {}, idProduct= {}".format(idV, idP)
device = usb.core.find(idVendor=idV, idProduct=idP)

if device is None:
    print ("Device not found")
    exit()


# free up the device from the kernal
for cfg in device:
    for intf in cfg:
        if device.is_kernel_driver_active(intf.bInterfaceNumber):
            try:
                device.detach_kernel_driver(intf.bInterfaceNumber)
            except usb.core.USBError as e:
                sys.exit("Could not detach kernel driver from interface({0}): {1}".format(intf.bInterfaceNumber, str(e)))

# try default conf
print "setting configuration"
device.set_configuration()
print "config set"

print "trying to claim device"
try:
    usb.util.claim_interface(device, 0)
    print "claimed device"
except usb.core.USBError as e:
    print "Error occurred claiming " + str(e)
    sys.exit("Error occurred on claiming")
print "device claimed"

# get enpoint instance
cfg = device.get_active_configuration()
print "***********"
for intf in cfg:
    print "intf= " + str(intf)
print "***********"

# from document:
# The HID interface is implemented on Interface 3, in addition to standard endpoint (er)0, the device supports
# EP4 IN (device to host) interrupt transfer type, and EP5 OUT (host to device) interrupt transfer type
#  Note: EP$ seems to come back as 0x84 while EP5 comes back as 0x05
intf = cfg[(3, 0)]

# get the BULK OUT descriptor
epo = usb.util.find_descriptor(
    intf,
    # match our first out endpoint
    custom_match= \
        lambda e: \
            usb.util.endpoint_direction(e.bEndpointAddress) == \
            usb.util.ENDPOINT_OUT)

assert epo is not None

# get the BULK IN descriptor
epi = usb.util.find_descriptor(
    intf,
    # match our first out endpoint
    custom_match= \
        lambda e: \
            usb.util.endpoint_direction(e.bEndpointAddress) == \
            usb.util.ENDPOINT_IN)

assert epi is not None

print "write the data"
# commands are 64 bytes long, first byte is command code, 02 is 'get version', it doesn't need any of the other bytes set
try:
    # don't think I can use [0x00]*63 because it will be all pointers to same object?, call them out to be safe
    test = [0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]
    mybuff = b'\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
    #device.write(epo,mybuff,1)         #timeout on write
    #epo.write(mybuff)                  #timeout on write
    epo.write(mybuff.encode('utf-8'))   #timeout on write
except usb.core.USBError as e:
    print "Write USBError: " + str(e)
    sys.exit()

print "done writing"
print "try read?"
try:
    #info = device.read(0x84, 8)
    info = epo.read(epi.bEndpointAddress,epi.wMaxPacketSize)
except usb.core.USBError as e:
    print "Read USBError: " + str(e)
    sys.exit()

print "read: " + str(info)

finding idVendor = 10943, idProduct= 1285
setting configuration
config set
trying to claim device
claimed device
device claimed
***********
< skipping audio interfaces>
intf=     INTERFACE 3: Human Interface Device ====================
     bLength            :    0x9 (9 bytes)
     bDescriptorType    :    0x4 Interface
     bInterfaceNumber   :    0x3
     bAlternateSetting  :    0x0
     bNumEndpoints      :    0x2
     bInterfaceClass    :    0x3 Human Interface Device
     bInterfaceSubClass :    0x0
     bInterfaceProtocol :    0x0
     iInterface         :    0x8 PlaylistControl
      ENDPOINT 0x84: Interrupt IN ==========================
       bLength          :    0x7 (7 bytes)
       bDescriptorType  :    0x5 Endpoint
       bEndpointAddress :   0x84 IN
       bmAttributes     :    0x3 Interrupt
       wMaxPacketSize   :   0x40 (64 bytes)
       bInterval        :    0xa
      ENDPOINT 0x5: Interrupt OUT ==========================
       bLength          :    0x7 (7 bytes)
       bDescriptorType  :    0x5 Endpoint
       bEndpointAddress :    0x5 OUT
       bmAttributes     :    0x3 Interrupt
       wMaxPacketSize   :   0x40 (64 bytes)
       bInterval        :    0xa
***********
write the data
Write USBError: [Errno 110] Operation timed out