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ads1247不能读寄存器,

通过SPI(430F2013)的接口,读MUX0,记录以下波形,信号都对的,

蓝线是CLK,黄线是DIN,命令字节是0x20,0x00,0xff,DOUT一直是低电平。

我的蕊片是模拟电源跟数字电源共用3.3V电源,不能读出有关糸吗?