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这是MSP430F247和两片ADS1278以SPI通信采集16路AD的实验，ADS1278的主时钟CLK用外部有源晶振5M,移位时钟SCLK设置为4M,可是假如把属于通道1，2，3，4接地，得到的数据都不是0，而是比较大的数值，为什么？
