28377D的ADC偏移校正无反应

user5233622

void ADC_AdcPPBOFF(void)
{
EALLOW;

    AdcaRegs.ADCPPB1CONFIG.bit.CONFIG = 0x0000;
    AdcaRegs.ADCPPB2CONFIG.bit.CONFIG = 0x0001;
    AdcaRegs.ADCPPB3CONFIG.bit.CONFIG = 0x0010;
    if(offset_Iu >= 0)
    {
        AdcaRegs.ADCPPB1CONFIG.bit.TWOSCOMPEN = 0;
        AdcaRegs.ADCPPB2CONFIG.bit.TWOSCOMPEN = 0;
        AdcaRegs.ADCPPB3CONFIG.bit.TWOSCOMPEN = 0;
        AdcaRegs.ADCPPB1OFFCAL.bit.OFFCAL = offset_Iu;
        AdcaRegs.ADCPPB2OFFCAL.bit.OFFCAL = offset_Iu;
        AdcaRegs.ADCPPB3OFFCAL.bit.OFFCAL = offset_Iu;
    }
    else
    {
        AdcaRegs.ADCPPB1CONFIG.bit.TWOSCOMPEN = 1;
        AdcaRegs.ADCPPB2CONFIG.bit.TWOSCOMPEN = 1;
        AdcaRegs.ADCPPB3CONFIG.bit.TWOSCOMPEN = 1;
        AdcaRegs.ADCPPB1OFFCAL.bit.OFFCAL = -(offset_Iu);
        AdcaRegs.ADCPPB2OFFCAL.bit.OFFCAL = -(offset_Iu);
        AdcaRegs.ADCPPB3OFFCAL.bit.OFFCAL = -(offset_Iu);
    }
//============================================================
    AdccRegs.ADCPPB1CONFIG.bit.CONFIG = 0x0000;
    AdccRegs.ADCPPB2CONFIG.bit.CONFIG = 0x0001;
    AdccRegs.ADCPPB3CONFIG.bit.CONFIG = 0x0010;
    if(offset_Iu >= 0)
    {
        AdccRegs.ADCPPB1CONFIG.bit.TWOSCOMPEN = 0;
        AdccRegs.ADCPPB2CONFIG.bit.TWOSCOMPEN = 0;
        AdccRegs.ADCPPB3CONFIG.bit.TWOSCOMPEN = 0;
        AdccRegs.ADCPPB1OFFCAL.bit.OFFCAL = offset_Iv;
        AdccRegs.ADCPPB2OFFCAL.bit.OFFCAL = offset_Iv;
        AdccRegs.ADCPPB3OFFCAL.bit.OFFCAL = offset_Iv;
    }
    else
    {
        AdccRegs.ADCPPB1CONFIG.bit.TWOSCOMPEN = 1;
        AdccRegs.ADCPPB2CONFIG.bit.TWOSCOMPEN = 1;
        AdccRegs.ADCPPB3CONFIG.bit.TWOSCOMPEN = 1;
        AdccRegs.ADCPPB1OFFCAL.bit.OFFCAL = -(offset_Iv);
        AdccRegs.ADCPPB2OFFCAL.bit.OFFCAL = -(offset_Iv);
        AdccRegs.ADCPPB3OFFCAL.bit.OFFCAL = -(offset_Iv);
    }
//============================================================
    AdcdRegs.ADCPPB1CONFIG.bit.CONFIG = 0x0000;
    AdcdRegs.ADCPPB2CONFIG.bit.CONFIG = 0x0001;
    AdcdRegs.ADCPPB3CONFIG.bit.CONFIG = 0x0010;
    if(offset_Iu >= 0)
    {
        AdcdRegs.ADCPPB1CONFIG.bit.TWOSCOMPEN = 0;
        AdcdRegs.ADCPPB2CONFIG.bit.TWOSCOMPEN = 0;
        AdcdRegs.ADCPPB3CONFIG.bit.TWOSCOMPEN = 0;
        AdcdRegs.ADCPPB1OFFCAL.bit.OFFCAL = offset_Iw;
        AdcdRegs.ADCPPB2OFFCAL.bit.OFFCAL = offset_Iw;
        AdcdRegs.ADCPPB3OFFCAL.bit.OFFCAL = offset_Iw;
    }
    else
    {
        AdcdRegs.ADCPPB1CONFIG.bit.TWOSCOMPEN = 1;
        AdcdRegs.ADCPPB2CONFIG.bit.TWOSCOMPEN = 1;
        AdcdRegs.ADCPPB3CONFIG.bit.TWOSCOMPEN = 1;
        AdcdRegs.ADCPPB1OFFCAL.bit.OFFCAL = -(offset_Iw);
        AdcdRegs.ADCPPB2OFFCAL.bit.OFFCAL = -(offset_Iw);
        AdcdRegs.ADCPPB3OFFCAL.bit.OFFCAL = -(offset_Iw);
    }

EDIS;
}

上面是自己编写的偏移校正设定程序，通过运行仿真发现数值已写入OFFCAL，但ADCRESULT的值并未改变，希望得到解答，谢谢

6 年多前

0 user5233622 6 年多前

Intellectual 430 points

EALLOW;

AdccRegs.ADCPPB1CONFIG.bit.CONFIG = 0;
    AdccRegs.ADCPPB2CONFIG.bit.CONFIG = 1;
    AdccRegs.ADCPPB3CONFIG.bit.CONFIG = 2;
    AdccRegs.ADCPPB1CONFIG.bit.TWOSCOMPEN = 0;
    AdccRegs.ADCPPB2CONFIG.bit.TWOSCOMPEN = 0;
    AdccRegs.ADCPPB3CONFIG.bit.TWOSCOMPEN = 0;
    AdccRegs.ADCPPB1OFFCAL.bit.OFFCAL = offcal_Iv;
    AdccRegs.ADCPPB2OFFCAL.bit.OFFCAL = offcal_Iv;
    AdccRegs.ADCPPB3OFFCAL.bit.OFFCAL = offcal_Iv;

EDIS;

上述为PPB设置程序，无论将哪一个PPB分配给SOC0，也就是CONFIG = 0，SOC0得出结果都没有进行偏移校正，其他两个PPB工作正常，实在搞不懂，希望得到解答

0 Green Deng 6 年多前回复 user5233622

TI__Guru** 101655 points

应该也要配置PPB4，因为默认SOC是SOC0, ppb越高，优先级越高:

0 user5233622 6 年多前回复 Green Deng

Intellectual 430 points

还有个问题想请教一下，我程序内将2048当作零，得出差值将差值输入OFFCAL。当差值大于五百左右时PPB的计算结果就错误了。
比如：此时ADC实际采样值为2570，差值为2570-2048 = 522，将结果输入OFFCAL，TWOSCOMPEN选0，最终运算结果却为3074。而如果差值小一些就能正常工作，结果归为2048附近。麻烦帮忙分析一下，谢谢

0 user5233622 6 年多前回复 Green Deng

Intellectual 430 points

做了一下特殊实验差值不由计算决定，实际AD值为2645，OFFCAL写入400时ADCRESULT结果可运算为2245，OFFCAL写入600时ADCRESULT结果运算为3074

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28377D的ADC偏移校正无反应