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我的波特率是通过宏定义这样写死的是921600，但是我今天突然发现它打印的东西是乱码，我怎么重连串口都不行，就试探性的改了波特率，试到115200的时候真的就正常了……有没有可能是它时钟出了问题？毕竟921600和115200刚好是8倍，但是我想不出什么情况会出这个问题。
重启后又一切都正常了 偶发 没有再复现到
