Python在Windows下操作CH341DLL

 #! /usr/bin/env python
 #coding=utf-8
 import os
 import time
 from ctypes import *

 class USBI2C():
     ch341 = windll.LoadLibrary("CH341DLL.dll")
     def __init__(self, usb_dev = 0, i2c_dev = 0x5c):
         self.usb_id   = usb_dev
         self.dev_addr = i2c_dev
         if USBI2C.ch341.CH341OpenDevice(self.usb_id) != -1:
             USBI2C.ch341.CH341SetStream(self.usb_id, 0x82)
             USBI2C.ch341.CH341CloseDevice(self.usb_id)
         else:
             print("USB CH341 Open Failed!")

     def read(self, addr):
         if USBI2C.ch341.CH341OpenDevice(self.usb_id) != -1:
             obuf = (c_byte * 2)()
             ibuf = (c_byte * 1)()
             obuf[0] = self.dev_addr
             obuf[1] = addr
             USBI2C.ch341.CH341StreamI2C(self.usb_id, 2, obuf, 1, ibuf)
             USBI2C.ch341.CH341CloseDevice(self.usb_id)
             return ibuf[0] & 0xff
         else:
             print("USB CH341 Open Failed!")
             return 0

     def write(self, addr, dat):
         if USBI2C.ch341.CH341OpenDevice(self.usb_id) != -1:
             obuf = (c_byte * 3)()
             ibuf = (c_byte * 1)()
             obuf[0] = self.dev_addr
             obuf[1] = addr
             obuf[2] = dat & 0xff
             USBI2C.ch341.CH341StreamI2C(self.usb_id, 3, obuf, 0, ibuf)
             USBI2C.ch341.CH341CloseDevice(self.usb_id)
         else:
             print("USB CH341 Open Failed!")