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SCI串口RXFIFO问题

我在通信中使用了SCI的RXFIFO 16字节深度到达时通过匹配中断来读取数据,希望以此减少接收中断次数。但现在有一个问题当接收到的最后的数据不够16个时中断就无法触发,最后的这几个字节必须在下次通信开始几个字节后才能读到。有没有什么办法得以解决谢谢!