import sensor, image, time, network, usocket, sys
from pyb import UART
uart = UART(3, 9600)
while(True):
uart.write("123\r\t")
time.sleep_ms(1000)
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wifi扩展板上的串口通信,配置好串口后,星瞳助手显示乱码,并且只发一次消息。请问是怎么回事?