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DSP2806+AD7705实现AD采样



我现在在用DSP2806和AD7705进行AD采样,利用DSP的SPI总线实现与AD7705的通信: (1)我将DSP2806的SPI总线配置成8位,这样便于对AD7705进行配置,但是读取AD值时,返回的AD采样值是16位的,这时候我怎么样读取呢?(2)SPI发送时是左端对齐,接收时是右端对齐;而AD7705写入与读取都是左端对齐,那么DSP在读取AD7705返回的AD采样值时,并不是读到的真实的AD值,而是要经过一下变换,对吧?谢谢解答!!!