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手册上说DRDY会在SCLK的下降沿自动变成高电平（DRDY s pulled high at the falling edge of SCLK），但为什么我做了几次后发现DRDY并没有自动变成高电平，而是一直维持在低电平。
你上电后，没启动转换前，DRDY是高还是低呢？
START置高电平前,DRDY是高，启动转换之后，就一直是低电平
