pyerial读写串口

错误：
AttributeError: module 'serial' has no attribute 'Serial'

1.自己写的文件命令成立serial.py，import serial 产生冲突

2.安装的serial包不对，应该安装pyserial包

 

ubuntu下查看串口：

dmesg | grep ttyS*

sudo chmod 666 /dev/ttyUSB0

具体使用可以参考官网：https://pythonhosted.org/pyserial/shortintro.html

 

1.查找所有串口：

import time
import serial
import serial.tools.list_ports
import platform


class getMCUVersion:
    def __init__(self):
        self.baudrate = 115200
        self.locsys = platform.system()
        self.mcu_name = ""
        self.use_serial_list = []

    def find_seral(self):
        comlist = serial.tools.list_ports.comports()  # 为所有的串口分别生成ListPortInfo object，列表封装
        # for i in range(len(comlist)):
        #     print(comlist[i])                 #打印串口详细信息
        if self.locsys == "Linux":
            for element in comlist:
                if 'USB' in str(element):
                    # print("使用{0}".format(element.device))
                    self.use_serial_list.append(element.device)
        elif self.locsys == "Windows":
            for element in comlist:
                if 'USB-to-Serial' in str(element):
                    # print("使用{0}".format(element.device))
                    self.use_serial_list.append(element.device)
        return self.use_serial_list


    def get_version(self, ser, timeout=3):
        if ser == '':
            return "not serial cable, check MCU serial cable"
        lab_ver = 0
        try:
            ser = serial.Serial(ser, self.baudrate, writeTimeout=0.5, timeout=0.01)
            start = time.time()
            while True:
                current = time.time()
                if current - start > timeout:
                    break
                data = ser.readline()
                if 'FSD_A' in str(data) or 'ADMAX_A' in str(data):
                    mcu_name = "MCU1_VER"
                    break
                elif 'FSD_B' in str(data) or 'ADMAX_B' in str(data):
                    mcu_name = "MCU2_VER"
                    break

            count = ser.write(b"version\r")
            if count <= 0:
                print("输入指令长度小于等于0,请检查")
                return

            for i in range(20):
                data = ser.readline()
                if 'X01' in str(data):
                    ver = str(data)[2:-5]
                    if ver.find('\\x00') != -1:
                        ver = ver[4:]
                    if ver.find('\\r') != -1:
                        ver = ver[2:]
                    if ver.find('\r') != -1:
                        ver = ver[1:]
                    return mcu_name + ":" + ver
                else:
                    lab_ver += 1

            if lab_ver == 10:
                return
            ser.flush()
            ser.close()
        except Exception as e:
            pass

        return

    def get_swap(self, ser, timeout=3):
        if ser == '':
            return "not serial cable, check MCU serial cable"
        lab_swap = 0
        try:
            ser = serial.Serial(ser, self.baudrate, writeTimeout=0.5, timeout=0.01)
            ser.flush()
            start = time.time()
            while True:
                current = time.time()
                if current - start > timeout:
                    break
                data = ser.readline()
                if 'FSD_A' in str(data) or 'ADMAX_A' in str(data):
                    mcu_name = "MCU1_SWAP"
                    break
                elif 'FSD_B' in str(data) or 'ADMAX_B' in str(data):
                    mcu_name = "MCU2_SWAP"
                    break

            count = ser.write(b"getswap\r")
            if count <= 0:
                print("输入指令长度小于等于0,请检查")
                return -1

            for i in range(20):
                data = ser.readline()
                if 'Swap' in str(data):
                    swap = str(data)[2:-5]
                    if swap.find('\\x00') != -1:
                        swap = swap[4:]
                    if swap.find('\\r') != -1:
                        swap = swap[2:]
                    if swap.find('\r') != -1:
                        swap = swap[1:]
                    return mcu_name + ":" + swap.strip('\r')
                else:
                    lab_swap += 1
            if lab_swap == 10:
                return
            ser.flush()
            ser.close()
        except Exception as e:
            pass
        return

    def test_one(self, ser):
        try:
            ser = serial.Serial(ser, self.baudrate, writeTimeout=0.5)
            ser.write(b"version\r")
            ser.write(b"getswap\r")
            ser.close()
        except Exception as e:
            if "Permission denied" in str(e):
                print('请给串口权限,执行命令:sudo chmod 777 ' + ser)

        return

    def run(self):
        serial_lst = self.find_seral()
        if len(serial_lst) < 2:
            return 0
        rest = dict()
        loop = 10
        while loop:
            print('< 第{}次读取串口 >'.format(11-loop))
            for SER in serial_lst:
                self.test_one(SER)
                ver = self.get_version(SER)
                swap = self.get_swap(SER)
                if not ver or not swap:
                    continue
                else:
                    rest[ver.split(':')[0]] = ver.split(':')[1]
                    rest[swap.split(':')[0]] = swap.split(':')[1]
            if len(rest) == 4:
                return rest
            loop = loop - 1
        return rest


if __name__ == '__main__':
    test = getMCUVersion()
    ret = test.run()
    if not ret:
        print('请检查MCU串口是否连接')
        exit(-1)
    print(ret['MCU1_VER'])
    print(ret['MCU1_SWAP'])
    print(ret['MCU2_VER'])
    print(ret['MCU2_SWAP'])
    time.sleep(3)

 

2.创建一个串口

ser = serial.Serial(ser, self.baudrate, writeTimeout=0.5, timeout=0.01)

3.写入数据

ser.write(b"version")

4.读取数据，如果串口有心跳，可以读取多行数据根据关键字查找

data = ser.readline()

5.刷新串口，关闭串口

ser.flush()
ser.close()