TMS320F2812: Low or Incorrect ADC Values on eZdsp Eval Board

I am currently using an eZdsp F2812 evaluation board and trying to get the ADC to work.  I have configured the ADC for sequential sampling cascaded sequencer mode (as shown in the InitADC function below).  There is no external reference voltage used in these conversions.  The Development Environment is Code Composer Suite v7 (7.3.0).

Using the eval board, we have added wiring that connect certain DC voltages on the board to the ADC inputs on P5/P9 (Analog Inputs).

void InitADC(struct ADC_VARIABLES_TYPE *ADCvalues)
{
    AdcRegs.ADCTRL3.bit.ADCBGRFDN = 0x3;    // Power up bandgap/reference circuitry
    DELAY_US(ADC_8msDELAY);                 // Delay before powering up rest of ADC
    AdcRegs.ADCTRL3.bit.ADCPWDN   = 1;      // Power up rest of ADC
    DELAY_US(ADC_20usDELAY);                // Delay after powering up ADC

    AdcRegs.ADCTRL1.bit.ACQ_PS    = ADC_SHCLK;
    AdcRegs.ADCTRL3.bit.ADCCLKPS  = ADC_CKPS;
    AdcRegs.ADCTRL3.bit.SMODE_SEL = 0;       // 0 = Sequential (not simultaneous)
    AdcRegs.ADCTRL1.bit.SEQ_CASC  = 1;       // 1 = Cascaded (not dual)
    AdcRegs.ADCMAXCONV.bit.MAX_CONV1 = 0xF;  // Setup 16 conversions

    /* Analog channels selected in sequential order */
    AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x0;
    AdcRegs.ADCCHSELSEQ1.bit.CONV01 = 0x1;
    AdcRegs.ADCCHSELSEQ1.bit.CONV02 = 0x2;
    AdcRegs.ADCCHSELSEQ1.bit.CONV03 = 0x3;
    AdcRegs.ADCCHSELSEQ2.bit.CONV04 = 0x4;
    AdcRegs.ADCCHSELSEQ2.bit.CONV05 = 0x5;
    AdcRegs.ADCCHSELSEQ2.bit.CONV06 = 0x6;
    AdcRegs.ADCCHSELSEQ2.bit.CONV07 = 0x7;
    AdcRegs.ADCCHSELSEQ3.bit.CONV08 = 0x8;
    AdcRegs.ADCCHSELSEQ3.bit.CONV09 = 0x9;
    AdcRegs.ADCCHSELSEQ3.bit.CONV10 = 0xA;
    AdcRegs.ADCCHSELSEQ3.bit.CONV11 = 0xB;
    AdcRegs.ADCCHSELSEQ4.bit.CONV12 = 0xC;
    AdcRegs.ADCCHSELSEQ4.bit.CONV13 = 0xD;
    AdcRegs.ADCCHSELSEQ4.bit.CONV14 = 0xE;
    AdcRegs.ADCCHSELSEQ4.bit.CONV15 = 0xF;

    AdcRegs.ADCTRL1.bit.CONT_RUN = 0;       // Start-Stop Mode

    AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;       // Reset SEQ1

} /* InitADC */

After calling the InitADC (along with the other DSP Initialization routines), I call the StartADCConversion function.

void StartADCConversion()
{
    // Start New Conversion
    AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;         // Reset SEQ1

    // Start of Conversion.  Cannot be done at same time as reset
    AdcRegs.ADCTRL2.bit.SOC_SEQ1 = 1;

} /* StartADCConversion */

At present, I’m looking at the raw numbers that the ADC provides for each of the voltages it samples. Refer to the ProcessADC function below.  When I step through the code and observe the values from the analog-to-digital conversion, they are lower than I am expecting.  Refer to the table below.

void ProcessADC(struct ADC_VARIABLES_TYPE *ADCvalues)
{
    if (!AdcRegs.ADCST.bit.SEQ1_BSY)
    {
        ADCvalues->rawValue.adcina0 = AdcRegs.ADCRESULT0  >> 4;
        ADCvalues->rawValue.adcina1 = AdcRegs.ADCRESULT1  >> 4;
        ADCvalues->rawValue.adcina2 = AdcRegs.ADCRESULT2  >> 4;
        ADCvalues->rawValue.adcina3 = AdcRegs.ADCRESULT3  >> 4;
        ADCvalues->rawValue.adcina4 = AdcRegs.ADCRESULT4  >> 4;
        ADCvalues->rawValue.adcina5 = AdcRegs.ADCRESULT5  >> 4;
        ADCvalues->rawValue.adcina6 = AdcRegs.ADCRESULT6  >> 4;
        ADCvalues->rawValue.adcina7 = AdcRegs.ADCRESULT7  >> 4;
        ADCvalues->rawValue.adcinb0 = AdcRegs.ADCRESULT8  >> 4;
        ADCvalues->rawValue.adcinb1 = AdcRegs.ADCRESULT9  >> 4;
        ADCvalues->rawValue.adcinb2 = AdcRegs.ADCRESULT10 >> 4;
        ADCvalues->rawValue.adcinb3 = AdcRegs.ADCRESULT11 >> 4;
        ADCvalues->rawValue.adcinb4 = AdcRegs.ADCRESULT12 >> 4;
        ADCvalues->rawValue.adcinb5 = AdcRegs.ADCRESULT13 >> 4;
        ADCvalues->rawValue.adcinb6 = AdcRegs.ADCRESULT14 >> 4;
        ADCvalues->rawValue.adcinb7 = AdcRegs.ADCRESULT15 >> 4;

    }

} /* ProcessADC */

I’ve summarized the observations in the table below and highlighted the low or incorrect values. My question is why am I getting these readings?