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F28069 SCI FIFO接收 单次接收数据长度最长只能为4？怎么一次性接收不定长数据呢？已经尝试了在使用深度为4的FIFO时，各种清标志位，不使用FIFO，都无法达到目标，困扰了我好久，急盼回复！谢谢！
