无法使用python从Libmpsse获取ChannelInfo

问题描述

我无法从我的 FTDI USB-I2C 智能电缆 (C232HM-DHSL-0) 获取频道信息。我可以获得通道号，但它总是在 I2C_GetChannelInfo() 处显示 status = 1。任何人都可以帮助找出原因吗？我的代码如下：

import ctypes
from ctypes import wintypes
import ctypes as c
import os

class FT_DEVICE_LIST_INFO_NODE(ctypes.Structure):   # Add this structure refering to ...
    _fields_ = [("Flags",ctypes.c_ulong),("Type",("ID",("LociD",ctypes.c_long),("SerialNumber",ctypes.c_byte * 16),("Description",ctypes.c_byte * 64),("ftHandle",ctypes.c_void_p)]


def libmPSSE_Method():  
    chn_count = ctypes.c_int()
    libmPSSE  = ctypes.cdll.LoadLibrary(str(os.getcwd())+"\\libmPSSE.dll")
    libmPSSE.Init_libmPSSE()
    status = libmPSSE.I2C_GetNumChannels(ctypes.byref(chn_count))
    print 'Total I2C Channel -->>',str(chn_count.value),' channels'

    if chn_count.value > 0:
        flags = c.c_ulong()
        typ = c.c_ulong()
        ID = c.c_ulong()
        LociD = c.c_ulong()
        serial = c.create_string_buffer(16)
        desc = c.create_string_buffer(64)
        handle = c.c_void_p()


        for i in range(chn_count.value):
            channel_info = FT_DEVICE_LIST_INFO_NODE()
        # =========== getting Channel info ======================================
            status = libmPSSE.I2C_GetChannelInfo(c.byref(channel_info))
            print 'status = ',status
            #status = libmPSSE.I2C_GetChannelInfo(i,channel_info)
            print '=======Channel[',i,']=============='
            print channel_info.Flags    # ("Flags",print channel_info.Type     # ("Type",print channel_info.ID       # ("ID",print channel_info.LociD    # ("Locid",print channel_info.SerialNumber
            #print(''.join([chr(i) for i in channel_info.SerialNumber]).rstrip('\x00'))        # ("SerialNumber",# just to print string in ctype bytearray( refering https://stackoverflow.com/questions/29291624/python-convert-ctypes-ubyte-array-to-string)
            print(''.join([chr(i) for i in channel_info.Description]).rstrip('\x00'))         # ("Description",print '=============================='
    print '*************************************************************************************'

libmPSSE_Method()

解决方法

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