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ADS127L11: 配置ADC不成功,根本改变不了寄存器值

Part Number: ADS127L11

我使用4线spi不管怎么配置寄存器,示波器看到ADC的drdy脉冲周期始终是400K,不知道怎么回事?我检查时序也都是符合要求的正常操作。