python的pyserial模块

发布时间:2019-09-21 11:04:12编辑:auto阅读(2027)

    pyserial是python提供用于进行串口通信的库

    源文档:https://pythonhosted.org/pyserial/

    1、安装pyserial

    pip install pyserial

    2、查看电脑现连串口设备

    import serial.tools.list_ports
    
    #检测设备的端口数
    # plist = list(serial.tools.list_ports.comports())
    
    # if len(plist) <= 0:
    #     print("没有发现端口!")
    # else:
    #     #端口数
    #     print len(plist)
    
    #     plist_0 = list(plist[1])
    #     serialName = plist_0[0]
    #     print serialName
    
    #     serialFd = serial.Serial(serialName, 9600, timeout=60)
    #     print(serialFd.name)

    3、将要发送的数据进行转换

    所发十六进制需转换为以下格式
    # 所发十六进制字符串010591F50000F104
    cmd = [0x01, 0x05, 0x91, 0xF5, 0x00, 0x00, 0xF1, 0x04]
        # 转成16进制的函数
        def convert_hex(string, strip_index_end=18):
            result = []
            for i in range(0, strip_index_end, 2):
                hex_num = '0x' + string[i] + string[i+1]
                result.append(eval(hex_num))
            return result

    4、进行串口通信

    串口通信 
    Windows下端口为COM*, Ubuntu下为/dev/ttyS*
    
    class Ser(object):
            def __init__(self):
                    # 打开端口
                    self.port = serial.Serial(port=serialconf.SERIAL_NAME, baudrate=serialconf.SERIAL_PORT, timeout=serialconf.SERIAL_TIMEOUT)
    
        # 发送指令的完整流程
        def send_cmd(self, send_cmd):
                send_cmd = self.convert_hex(send_cmd)
                _LOG.debug("serial port send_command:[%s]" % repr(send_cmd))
                self.port.write(send_cmd)
    
        def recv_data(self, len=4):
                response = self.port.read(6)
                response = response.encode('hex')
                return response
    
        # 转成16进制的函数
        def convert_hex(self, string, strip_index_end=18):
                result = []
                for i in range(0, strip_index_end, 2):
                        hex_num = '0x' + string[i] + string[i+1]
                        result.append(eval(hex_num))
                return result

    5、测试用例

    my_ser = Ser()
    print "send blink command"
    my_ser.send_cmd(serialconf.BLINK_CMD)
    ret = my_ser.recv_data()
    print "send blink ret:%s %d" % (ret, ret.lower() == serialconf.BLINK_RET.lower())

    6、接口、参数详细介绍

    优秀博客:https://blog.csdn.net/u012611644/article/details/79125234

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