python调用串口发送数据

为了通过python编程控制串口发送数据给单片机，编写此程序

# !/usr/bin/env python
# -*- coding: utf-8 -*-
"""
# ============================================================
# @Date    : 2022/05/16 21:50:12
# @Author  : miles
# @Email   : lishan@st.xatu.edu.cn
# @File    : serial_demo.py
# @IDE     : PyCharm
# @Func    : Describes the function of the file
# ============================================================
"""
import time
 
import serial.tools.list_ports
 
if __name__ == '__main__':
    # 读取串口列表
    ports_list = list(serial.tools.list_ports.comports())
    if len(ports_list) <= 0:
        print("无串口设备")
    else:
        print("可用的串口设备如下: ")
        print("num\t\tname\t\t\t\t\t\tnumber")
        for i in range(len(ports_list)):
            comport = list(ports_list[i])
            comport_number, comport_name = comport[0], comport[1]
            print("%s\t\t%s\t\t%s" % (i, comport_name, comport_number))
 
        # 打开串口
        port_num = ports_list[0][0]
        print("默认选择串口: %s" % port_num)
        # 串口号: COM3, 波特率: 115200, 数据位: 7, 停止位: 2, 超时时间: 0.5秒
        ser = serial.Serial(port=port_num, baudrate=115200, bytesize=serial.SEVENBITS, stopbits=serial.STOPBITS_TWO,
                            timeout=0.5)
        if ser.isOpen():
            print("打开串口成功, 串口号: %s" % ser.name)
        else:
            print("打开串口失败")
 
        # 串口发送数据
        data = "%d:%d" % (130, 1)
        print("发送数据: %s" % data)
        write_len = ser.write(data.encode('utf-8'))
        print("串口发出{}个字节".format(write_len))
 
        # 读取串口输入信息并输出
        while True:
            t = time.time()
            print("\r%.2f 等待串口接收数据......" % t, end="")
            com_input = ser.read(10)
            if com_input:
                print(com_input)
                break
 
        # 关闭串口
        ser.close()
        if ser.isOpen():
            print("串口未关闭")
        else:
            print("串口已关闭")