TMS320F280049C: Unable to sample data ADC-C Input 1

Part Number: TMS320F280049C
Other Parts Discussed in Thread: DRV8320

Hello,

I've searched all over the forums but can't find anything related. For some reason we are unable to sample data on ADC-C Input 1 "C1".  Below is the function for setting up the ADCs.  All other ADCs are working except for C1.

C1 is dedicated to sampling one of the phase voltages for a BLDC drive which incorporates a DRV8320.

Thank you in advance for any ideas!

Best,
Jonathan

void HAL_setupADCs(HAL_Handle handle)
{
    HAL_Obj *obj = (HAL_Obj *)handle;

    SysCtl_delay(100U);
    ADC_setVREF(obj->adcHandle[2], ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);
    ADC_setVREF(obj->adcHandle[1], ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);
    ADC_setVREF(obj->adcHandle[0], ADC_REFERENCE_INTERNAL, ADC_REFERENCE_3_3V);
    SysCtl_delay(100U);

    // Configure internal reference as 1.65V*2 = 3.3V
    ASysCtl_setAnalogReference1P65(ASYSCTL_VREFHIA |
                                   ASYSCTL_VREFHIB |
                                   ASYSCTL_VREFHIC);

    // Enable internal voltage reference
    ASysCtl_setAnalogReferenceInternal(ASYSCTL_VREFHIA |
                                       ASYSCTL_VREFHIB |
                                       ASYSCTL_VREFHIC);

    // Set main clock scaling factor (50MHz max clock for the ADC module)
    ADC_setPrescaler(obj->adcHandle[0], ADC_CLK_DIV_2_0);
    ADC_setPrescaler(obj->adcHandle[1], ADC_CLK_DIV_2_0);
    ADC_setPrescaler(obj->adcHandle[2], ADC_CLK_DIV_2_0);

    // set the ADC interrupt pulse generation to end of conversion
    ADC_setInterruptPulseMode(obj->adcHandle[0], ADC_PULSE_END_OF_CONV);
    ADC_setInterruptPulseMode(obj->adcHandle[1], ADC_PULSE_END_OF_CONV);
    ADC_setInterruptPulseMode(obj->adcHandle[2], ADC_PULSE_END_OF_CONV);

    // enable the ADCs
    ADC_enableConverter(obj->adcHandle[0]);
    ADC_enableConverter(obj->adcHandle[1]);
    ADC_enableConverter(obj->adcHandle[2]);

    // set priority of SOCs
    ADC_setSOCPriority(obj->adcHandle[0], ADC_PRI_ALL_HIPRI);
    ADC_setSOCPriority(obj->adcHandle[1], ADC_PRI_ALL_HIPRI);
    ADC_setSOCPriority(obj->adcHandle[2], ADC_PRI_ALL_HIPRI);

    // delay to allow ADCs to power up
    SysCtl_delay(1000U);

    // RB2/B1
    ADC_setInterruptSource(obj->adcHandle[1], ADC_INT_NUMBER1, ADC_SOC_NUMBER2);

    // ISENA --> B2
    ADC_setupSOC(obj->adcHandle[1], ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM2_SOCA,    
                     ADC_CH_ADCIN2, HAL_ADC_SAMPLE_WINDOW);

    // ISENB  --> B4 or C8
    ADC_setupSOC(obj->adcHandle[2], ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM2_SOCA,    
                         ADC_CH_ADCIN8, HAL_ADC_SAMPLE_WINDOW);

    // ISENC --> C0
    ADC_setupSOC(obj->adcHandle[0], ADC_SOC_NUMBER0, ADC_TRIGGER_EPWM2_SOCA,    
                     ADC_CH_ADCIN0, HAL_ADC_SAMPLE_WINDOW);

    // VSENA - A2
        ADC_setupSOC(obj->adcHandle[0], ADC_SOC_NUMBER1, ADC_TRIGGER_EPWM2_SOCA,    
                     ADC_CH_ADCIN2, HAL_ADC_SAMPLE_WINDOW);

    // VSENB - C1
        ADC_setupSOC(obj->adcHandle[2], ADC_SOC_NUMBER1, ADC_TRIGGER_EPWM2_SOCA,    
                     ADC_CH_ADCIN1, HAL_ADC_SAMPLE_WINDOW);

    // VSENC - C2->RC1
    ADC_setupSOC(obj->adcHandle[2], ADC_SOC_NUMBER1, ADC_TRIGGER_EPWM2_SOCA,    
                 ADC_CH_ADCIN2, HAL_ADC_SAMPLE_WINDOW);

    // VSENVM - B1->RB2. 
    ADC_setupSOC(obj->adcHandle[1], ADC_SOC_NUMBER2, ADC_TRIGGER_EPWM2_SOCA,    
                 ADC_CH_ADCIN1, HAL_ADC_SAMPLE_WINDOW);

    // B3 Speed Input
    ADC_setupSOC(obj->adcHandle[1], ADC_SOC_NUMBER15, ADC_TRIGGER_EPWM2_SOCA,   
                     ADC_CH_ADCIN3, HAL_ADC_SAMPLE_WINDOW);

  return;
} // end of HAL_setupADCs() function