[参考译文] TMDSCNCD28379D：ADC 结果寄存器问题(与 SOC 不匹配)

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1432733/tmdscncd28379d-adc-result-register-problem-not-matched-to-soc

工具与软件：

我打算使用 ADCA0~5 ADCB0~5、其中 SOC0被分配给 ADCA0、SOC1被分配给 ADCA1、...依顺序依此类推。

相关代码的设置如下

void setupADC(void)
{

//single ended

AdcSetMode(ADC_ADCA, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE);
AdcSetMode(ADC_ADCB, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE);

EALLOW;
//ADCA
AdcaRegs.ADCCTL2.bit.PRESCALE = 0;

AdcaRegs.ADCCTL1.bit.INTPULSEPOS = 1; 

AdcaRegs.ADCCTL1.bit.ADCPWDNZ = 1; 

//ADCB
AdcbRegs.ADCCTL2.bit.PRESCALE = 0;

AdcbRegs.ADCCTL1.bit.INTPULSEPOS = 1; 

AdcbRegs.ADCCTL1.bit.ADCPWDNZ = 1; 

EDIS;

DELAY_US(1000);
}

void setupADCSOC(void)
{

    EALLOW;
//ADCA

   AdcaRegs.ADCSOC0CTL.bit.CHSEL = 0;     // SOC0(=ADCA0)
   AdcaRegs.ADCSOC0CTL.bit.ACQPS = 50;    
   AdcaRegs.ADCSOC0CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0


   AdcaRegs.ADCSOC1CTL.bit.CHSEL = 1;     // SOC1(=ADCA1)
   AdcaRegs.ADCSOC1CTL.bit.ACQPS = 50;     
   AdcaRegs.ADCSOC1CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0
//
   AdcaRegs.ADCSOC2CTL.bit.CHSEL = 2;     // SOC2(=ADCA2)
   AdcaRegs.ADCSOC2CTL.bit.ACQPS = 50;     
   AdcaRegs.ADCSOC2CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0

   AdcaRegs.ADCSOC3CTL.bit.CHSEL = 3;     // SOC3(=ADCA3)
   AdcaRegs.ADCSOC3CTL.bit.ACQPS = 50;     
   AdcaRegs.ADCSOC3CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0


   AdcaRegs.ADCSOC4CTL.bit.CHSEL = 4;     // SOC4(=ADCA4)
   AdcaRegs.ADCSOC4CTL.bit.ACQPS = 50;    
   AdcaRegs.ADCSOC4CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0


   AdcaRegs.ADCSOC5CTL.bit.CHSEL = 5;     // SOC5(=ADCA5)
   AdcaRegs.ADCSOC5CTL.bit.ACQPS = 50;    
   AdcaRegs.ADCSOC5CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0

//   AdcaRegs.ADCINTSEL1N2.bit.INT1SEL = 0; // End of SOC5 will set INT1 flag
//   AdcaRegs.ADCINTSEL1N2.bit.INT1E = 1; // Enable INT1 flag
//   AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; // Make sure INT1 flag is cleared

   //ADCB

   AdcbRegs.ADCSOC0CTL.bit.CHSEL = 0;  // SOC0(=ADCB0)
   AdcbRegs.ADCSOC0CTL.bit.ACQPS = 50;     
   AdcbRegs.ADCSOC0CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0

   AdcbRegs.ADCSOC1CTL.bit.CHSEL = 1;     //  SOC1(=ADCB1)
   AdcbRegs.ADCSOC1CTL.bit.ACQPS = 50;     
   AdcbRegs.ADCSOC1CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0

   AdcbRegs.ADCSOC2CTL.bit.CHSEL = 2;     //  SOC2(=ADCB2)
   AdcbRegs.ADCSOC2CTL.bit.ACQPS = 50;     
   AdcbRegs.ADCSOC2CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0

   AdcbRegs.ADCSOC3CTL.bit.CHSEL = 3;     //  SOC3(=ADCB3)
   AdcbRegs.ADCSOC3CTL.bit.ACQPS = 50;     
   AdcbRegs.ADCSOC3CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0

   AdcbRegs.ADCSOC4CTL.bit.CHSEL = 4;     //  SOC4(=ADCB4)
   AdcbRegs.ADCSOC4CTL.bit.ACQPS = 50;     
   AdcbRegs.ADCSOC4CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0

   AdcbRegs.ADCSOC5CTL.bit.CHSEL = 5;     //  SOC5(=ADCB5)
   AdcbRegs.ADCSOC5CTL.bit.ACQPS = 50;    
   AdcbRegs.ADCSOC5CTL.bit.TRIGSEL = 1;   // Trigger on CPUTIMER0

  // AdcbRegs.ADCINTSEL1N2.bit.INT1SEL = 5; // End of SOC5 will set INT1 flag
   //AdcbRegs.ADCINTSEL1N2.bit.INT1E = 1; // Enable INT1 flag
  // AdcbRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; // Make sure INT1 flag is cleared


   EDIS;
}

正如预期的那样、当向 ADCA0引脚施加3.3V 电压时、RESULT0寄存器应输出4095、而 当向 ADCA0引脚施加0V  电压时、结果0应产生0。

但是、将3.3V 施加到 ADCA0会更改 RESULT1和 RESULT2寄存器中的值 (在这个情况下、引脚 ADCA1至 ADCA5被连接至 GND。)

此外、当向 ADCA1施加3.3V 电压(将 ADCA1和 ADCA 2至5连接至 GND)时、RESULT1寄存器的值没有变化。

我已正确分配引脚、将 SW2：基准电压设置为0–3.3V、但我仍然遇到结果寄存器值的意外变化以及 ADCB 中的同样问题。

--> ADCA0：0V  

RESULT1、2 --> 0

和 adcA1 3.3V (黄线)-->所有结果0