python接收字符并回显

 # -*- coding: utf-8 -*
 import serial
 import time
 # 打开串口
 ser = serial.Serial("/dev/ttyAMA0", 9600) #"/dev/ttyAMA0"为树莓派串口 win7为com7
 def main():
     while True:
         # 获得接收缓冲区字符
         count = ser.inWaiting()
         if count != 0:
             # 读取内容并回显
             recv = ser.read(count)
             ser.write(recv)
         # 清空接收缓冲区
         ser.flushInput()
         # 必要的软件延时
         time.sleep(0.1)

 if __name__ == '__main__':
     try:
         main()
     except KeyboardInterrupt:
         if ser != None:
             ser.close()

python接收字符并回显