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除了设置问题， 还有你设法试试调低采样率能否好展
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_32; 我设置 的32分频，现在经过调试可以采4路，但是误差很大，
我用的STM32F107外部晶振25兆，用SPI1，这个AD芯片是0.8兆到3.2兆
