pip install pyserial

import serial
 
#连接串口
serial = serial.Serial('COM14',115200,timeout=2) #连接COM14,波特率位115200
if serial.isOpen():
 print ('串口已打开')
else:
 print ('串口未打开')
 
 
 
#关闭串口
serial.close()
 
if serial.isOpen():
 print ('串口未关闭')
else:
 print ('串口已关闭')

while(1)
 {
 if (USART_RX_STA&0x8000)
 {
 len = USART_RX_STA&0x3FFF;
 for (t=0;t<len;t++)
 {
 USART_SendData(USART1,USART_RX_BUF[t]);
 while (USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
 }
 USART_RX_STA=0;
 }
 else
 { 
 times++;
 if(times%30==0)LED0=!LED0;//闪烁LED,提示系统正在运行.
 delay_ms(10); 
 }
 }

import serial
 
#连接串口
serial = serial.Serial('COM14',115200,timeout=2)
if serial.isOpen():
 print ('串口已打开')
 
 data = b'Beking\r\n' #发送的数据
 serial.write(data)  #串口写数据
 print ('You Send Data:',data)
 
 while True:
 data = serial.read(20) #串口读20位数据
 if data != b'':
 break
 print ('receive data is :',data) 
 
else:
 print ('串口未打开')
 
 
 
#关闭串口
serial.close()
 
if serial.isOpen():
 print ('串口未关闭')
else:
 print ('串口已关闭')