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msp430f149的spi问题

  各位朋友,我在做430的spi时有个疑惑,spi时全双工的,他在接收的时候也在发送,当他读SD卡的时候,也会收到来自SD卡的回应,那么我们怎么知道那个时候收到的才是SD卡的正确应答信号呢,有没有知道的,发个msp430读写SD卡 的程序给我好吗,帮我注释一下,非常感谢,