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ZHA1.20自定义串口开机发送HalUARTWrite(SERIAL_APP_PORT,"+++",3);上位机出现乱码

 如上图所示,我已经屏蔽了MT中的

HalUARTWrite(MT_UART_DEFAULT_PORT, msgPtr, dataLen + SPI_0DATA_MSG_LEN);在开机循环发送“+++”(HEX:0X2B)指令的时候总是会在“+++”之前有一段乱码,如下图所示:

 我想知道问题在哪里?每次重新上电都会有这端乱码。怎样才能解决这个问题?急急急!!!