本文以讀取USB無線測量設備數據舉例說明。需要用到pyusb模塊和libusb-1.0.dll，詳細說明如下。

一、配置libusb-1.0.dll

下載libusb-1.0.22.7z，根據操作系統來選擇對應的動態庫，如下：

• 32位操作系統：復制MS32\dll\libusb-1.0.dll到C:\Windows\SysWOW64

• 64位操作系統：復制 MS64\dll\libusb-1.0.dll到C:\Windows\System32

二、安裝USB驅動

打開zadig-2.5.exe

選擇菜單：Options->List All Devices，列出當前電腦所有USB設備，鍵盤和鼠標USB設備不用考慮

在設備列表中選擇USB設備，點擊“Replace Driver”按鈕安裝USB驅動

三、查詢USB設備的idVendor和idProduct

打開zadig-2.5.exe

選擇菜單：Options->List All Devices，列出當前電腦所有USB設備，鍵盤和鼠標USB設備不用考慮

USB ID后面的兩個值，分別對應：idVendor和idProduct

四、代碼

• 查詢所有USB設備信息

def get_usb_devlists():all_devs = usb.core.find(find_all=True)dev_list = []for d in all_devs:key = '{0}{1}'.format(hex(d.idVendor), hex(d.idProduct))try:dev_u = usb.core.find(idVendor=d.idVendor, idProduct=d.idProduct)dev_u.reset()if dev_u:dev_u.set_configuration() # added this linecfg = dev_u.get_active_configuration() # exception: access violation writing 0x0000000000000000intf = cfg[(0, 0)]ep = intf[0]dev_list.append(key)if key in CUsb.dev_dict: # 避免重復加入continueCUsb.dev_dict[key] = {'idVendor': d.idVendor, 'idProduct': d.idProduct, 'thread': False}except Exception as e:err_str = str(e)print("error!", err_str)

• 讀取USB設備數據

def __init__(self, VID: int=None, PID: int=None, dev=None, ep=None):self.VID = VIDself.PID = PIDself.dev_u = Noneself.ep = Noneif VID and PID:try:self.dev_u = usb.core.find(idVendor=VID, idProduct=PID)if self.dev_u:# get the configurationself.dev_u.set_configuration() # added this linecfg = self.dev_u.get_active_configuration()# get interface 0intf = cfg[(0, 0)]# print(self.dev_u)# get endpoints 1self.ep = intf[0]else:print("Can't find device!")except Exception as e:print('__init__: ', e)def read_data(self):if not self.ep:return []key_dict = {30: '1', 31: '2', 32: '3', 33: '4', 34: '5', 35: '6', 36: '7', 37: '8', 38: '9',39: '0', 40: '\n', 55: '.'}result_list = []data = []n = 0inter = 16while (40 not in data) or n < 1: # 40表示'\n'，是數據截止符n += 1try:if self.ep:data += self.ep.read(8, 1000) # timeout：1000毫秒except Exception as e:err_str = str(e)# print('-----------------------', err_str)count = len(data)# print(count, len(data), data)tmp_data = [data[i:i + inter] for i in range(0, count, inter)]# print(self.ep.bEndpointAddress, len(tmp_data), tmp_data)result_list.append('') # 創建初始值for idx, tmp in enumerate(tmp_data):data_str = self.get_value_form_8_byte(tmp)if data_str == '\n': # 截止符result_list[-1] += data_strif idx < len(tmp_data)-1: # 處理下一個，創建初始值result_list.append('')continueif (data_str == '' or data_str == '0') and result_list[-1] == '': # 過濾數字前面的0continueresult_list[-1] += data_strresult_list[-1] = ('0' + result_list[-1]) if (result_list[-1][0] == '.') else result_list[-1] # 處理小數點前面沒有0的情況return [i for i in result_list if ('\n' in i) and ('.' in i)] # 丟掉異常數據

總結

以上是生活随笔為你收集整理的python3操作USB设备的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。