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用OMAPL138 的spi 接ADC，为什么SPI receive buffer 接收到的数据的高低位顺序颠倒了，需要对接收到的数据进行位颠倒才能看到可靠的数据？
看一下ADC的手册，其发送数据的位序是否可设。SPI的接收总是MSB在前，LSB在最后。通常发送方可设。
