python的pyserial模块

Posted 2021-01-16

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