使用pyUSB在python中进行USB编程需要什么依赖关系

Question

我正试图让usb.find命令在我为Beagleboard在Angstrom上编写的python脚本中正常工作。

这是我的代码：

#!/usr/bin/env python
import usb.core 
import usb.util 
import usb.backend.libusb01 as libusb

PYUSB_DEBUG_LEVEL = 'debug'
# find our device
# Bus 002 Device 006: ID 1208:0815
#  idVendor           0x1208
#  idProduct          0x0815
# dev = usb.core.find(idVendor=0xfffe, idProduct=0x0001)
# iManufacturer           1 TOROBOT.com
dev = usb.core.find(idVendor=0x1208, idProduct=0x0815,
backend=libusb.get_backend() )

我不知道少了什么，但这是我所知道的。当我没有指定后端时，就找不到后端。当我指定后端usb.backend.libusb01时，我会得到以下错误：

root@beagleboard:~/servo# ./pyServo.py
Traceback (most recent call last):
  File "./pyServo.py", line 17, in <module>
    dev = usb.core.find(idVendor=0x1208, idProduct=0x0815, backend=libusb.get_backend() )
  File "/usr/lib/python2.6/site-packages/usb/core.py", line 854, in find
    return _interop._next(device_iter(k, v))
  File "/usr/lib/python2.6/site-packages/usb/_interop.py", line 60, in _next
    return next(iter)
  File "/usr/lib/python2.6/site-packages/usb/core.py", line 821, in device_iter
    for dev in backend.enumerate_devices():
  File "/usr/lib/python2.6/site-packages/usb/backend/libusb01.py", line 390, in enumerate_devices
    _check(_lib.usb_find_busses())
  File "/usr/lib/python2.6/ctypes/__init__.py", line 366, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python2.6/ctypes/__init__.py", line 371, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: python: undefined symbol: usb_find_busses

我缺少什么才能正常工作？

Answer 1

尝试通过opkg安装python-pyusb，这将安装本机依赖项。