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ADS1271时序问题(SPI通讯)

Other Parts Discussed in Thread: ADS1271

         我有STM32F103的SPI接口。我的CLK是27MHz,SCLK是9M,现在紫色波形是DOUT波形,黄色是D\R\D\Y\波形,蓝色是SCKL波形。

现在不知为什么D\R\D\Y\的低电平时间·始终在100ns至200ns之间变化,DOUT波形也极不稳定。采上来的数据根本不对。

        我已把输入端短路接地。