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28335 SPI 和一个外设通信,一直不成功



该外设要求时序如图所示,前3个byte发命令,然后回读,回读的时候,我用了dummy wite不知道问题出在哪里?我是用FIFO实现发5bytes数据的,SIMO线上用示波器看过数据,是对的,但是就是在SOMI线上看不到回读的数据,,但就是看不到SOMI线上有数据,,请帮我看看。