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ADS1256 DRDY一直为高，while(ADS1256_Read_DRDY); 一直等待；
之前调好了，但又出现ADS1256 DRDY一直为高不执行了，调好过两次，都过几天不行了。
STANDBY 模式, DRDY 会一直保存高
另外看看你的硬件有没有正常了, 包括供电, 信号连接, 复位, 时钟信号, 还有焊接等
