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28035SCI串口发送数据掉包

我给上位机发数据,一次8个字节,如果只是单独发不会出现掉包的现象,如果我DSP收到上位机的数据然后再发给上位机,则发给上位机则会出现掉包的现象,而且只掉最后一个字节。请问大家这是什么原因?