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关于ADS8684的使用问题

Other Parts Discussed in Thread: ISO7341FC, ADS8684

你好,我是用STM32F407操作ADS8684,中间加了隔离芯片ISO7341FC。对ADS8684的Program寄存器进行配置时,使用STM32F4的库函数HAL_SPI_TransmitReceive(&hspi1,ADTxbuf,ADRxbuf,0X04,100);返回的是Program寄存器的地址(左移一位加写命令1),对Command寄存器进行配置时,返回的是0xffff。请问这是什么原因,谢谢!