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ADS1256drdy引脚3.3V的输出脉冲接到F28335gpio口后变为330mv，此时GPIO口内部上拉使能（pud=1）。若是禁止内部上拉，变为均值为3.04v的小脉冲。
F28335gpio内部上拉禁止（pud=0）时，DRDY引脚输出
未接F28335GPIO口时，DRDY引脚输出。
F28335gpio内部上拉使能（pud=1）时，DRDY引脚输出
GPIO有没有配置为输入？
是输入，
// GPIO6 = GPIO6 //DRDY 输入 GpioCtrlRegs.GPAPUD.bit.GPIO6 = 1; GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 0; GpioCtrlRegs.GPADIR.bit.GPIO6 = 0;
