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ADS1110: 配置寄存器读出错误

Part Number: ADS1110

使用STM32F4系列的芯片驱动ADS1110做电压采样,配置寄存器设置为0x8C,但是读出的寄存器值时0XFF,但是数据寄存器读出的值很小,大概在500一下,麻烦大佬指导一下