发送前 2 或 3 条消息后 Python pyusb-libusb 超时

编程问答 2022-05-31

问题描述

我尝试使用 python 2.7 编写一个程序，该程序在设备（函数生成器）中发送一些命令。该函数发生器带有一个与 Windows 驱动程序连接的软件。在 USB 端口分析器的帮助下，我读取了通过 USB 端口发送软件的原始数据。之后用我的程序重放这些记录的数据，它运行良好。但是当我开始发送更多数据（3 或 4 条消息）时，会出现如下所示的错误。

''''''''''''''''''''''''''''''''''''''''''ERROR'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Traceback (most recent call last):
  File "b.py",line 51,in <module>
 ep.write('aa550100ff00ffef3600ff00000074696d6572206c6f636b00'.decode('hex')')
 File "C:\Python27\lib\site-packages\usb\core.py",line 406,in write
    return self.device.write(self,data,timeout)
  File "C:\Python27\lib\site-packages\usb\core.py",line 982,in write
    self.__get_timeout(timeout)
  File "C:\Python27\lib\site-packages\usb\backend\libusb0.py",line 549,in bulk_write
    data,timeout)
  File "C:\Python27\lib\site-packages\usb\backend\libusb0.py",line 659,in __write
    timeout
  File "C:\Python27\lib\site-packages\usb\backend\libusb0.py",line 447,in _check
    raise USBError(errmsg,ret)
usb.core.USBError: [Errno None] libusb0-dll:err [_usb_reap_async] timeout error

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

问题很随机，我找不到解决方案。 这是我正在使用的代码：

import time
# find our device
dev = usb.core.find(idvendor=0x5345,idProduct=0x1234)

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

# set the active configuration. With no arguments,the first
# configuration will be the active one
dev.set_configuration()

# get an endpoint instance
cfg = dev.get_active_configuration()
intf = cfg[(0,0)]

ep = usb.util.find_descriptor(
    intf,# match the first OUT endpoint
    custom_match = \
    lambda e: \
        usb.util.endpoint_direction(e.bEndpointAddress) == \
        usb.util.ENDPOINT_OUT)

assert ep is not None

# write the data

ep.write('aa550100ff00ffef3600ff00000074696d6572206c6f636b00'.decode('hex'))
ep.write('aa550100ff00ffef3600ff00000074696d6572206c6f636b00'.decode('hex'))
ep.write('aa550100ff00ffef3600ff00000074696d6572206c6f636b00'.decode('hex'))
ep.write('aa550100ff00ffef3600ff00000074696d6572206c6f636b00'.decode('hex'))

ep.write('aa550100ff00ffef360030'.decode('hex'))
ep.write('aa550100ff00ffef360030'.decode('hex'))
ep.write('aa550100ff00ffef360030'.decode('hex'))
ep.write('aa550100ff00ffef360030'.decode('hex'))

现在有人知道是什么导致了这个问题吗？ 提前致谢

解决方法

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libusbpythonpyusbtimeouttimeoutusbusb