ADC - Hung Inside ADCIntStatus - Don't See Issue

Other Parts Discussed in Thread: EK-TM4C123GXL

Hi TI:

After looking through the various forum threads on this issue, I still can't figure out why ADCIntStatus() never returns.  

Here are the basics.

Part# - EK-TM4C123GXL

OSC - PIOSC    I am not using an external clock.

SysCtlClockGet() Returns: 80,000,000

TI-RTOS - 1.10.0.23

ADC - Using "Drivers" Only.

Errata - I went through all of the Errata and "tried" to make sure I was avoiding those issues.  Noted in the code below.

EK_TM4C123GXL.c - This is really where the Init() Code Is.  The code you see was compacted just a bit.

I am very interested in understanding a few issues.

1. If this is a clock issue, is this a matter of associating the PLL with the ADC module?

I understand the Errata issue; but, I can not translate into Code.

I do not know if TI-RTOS likes having the clock changed.

2. The entire Interrupt issue is a mystery.  I so not see what the ADC "driver" code is doing here.

I'm not finding well explained examples for this.

In this environment, I do not seem to have easy access to the Interrupt table.  I'll need a bit of explanation here.

3. If above is not the issue, what is?

Any help would be most appreciated.  

Thank you. 

Rick

Code:

Init(void)
{
  // this code is in: EK_TM4C123GXL.c

  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
  SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

  SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);

  GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_3);
  GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_2);
  GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_1);
  GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_0);
  GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_3);
  GPIOPinTypeADC(GPIO_PORTD_BASE, GPIO_PIN_2);
}

void GetData(void)
{

  uint32_t uiClock;
  uint32_t ui32ADC0Value[8];

  iCount++;

  // Tiva™ C Series TM4C123x Microcontrollers Silicon Revisions 6 and 7 (Errata)

  // ADC#01 - Does not appear to apply
  // ADC#03 - More than one Step is used
  //                    No comparator is in use
  //                    This does not appear to be the issue
  // ADC#04 - Does not appear to apply
  // ADC#07 - Does not appear to apply
  // ADC#08 - Enabling the PLL seems to hang the Board or has no effect
  //                    Appears to be using the Precision Internal Oscillator (PIOSC)
  // ADC#09 - Does not appear to apply
  // ADC#11 - Does not appear to apply
  // ADC#13 - Removed PE3 from usage
  // ADC#14 - Does not appear to apply
  // ADC#16 - Does not appear to apply

  // ADC#08 - this causes the program to hang or has no effect - Commented out
  // SysCtlClockSet(SYSCTL_SYSDIV_2_5|SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |SYSCTL_XTAL_16MHZ);

  // Clock Check - Clock: 80,000,000
  uiClock = SysCtlClockGet();
  System_printf("Clock: %i \n", uiClock);
  System_flush();

  ADCSequenceDisable(ADC0_BASE, ADC_INT_SS0);

  ADCSequenceConfigure(ADC0_BASE, ADC_INT_SS0, ADC_TRIGGER_PROCESSOR, 0);

  // ADC#13 ADCSequenceStepConfigure(ADC0_BASE, ADC_INT_SS0, 0, ADC_CTL_CH0); // PE3 Commented out
  ADCSequenceStepConfigure(ADC0_BASE, ADC_INT_SS0, 0, ADC_CTL_CH1);                                                             // PE2
  ADCSequenceStepConfigure(ADC0_BASE, ADC_INT_SS0, 1, ADC_CTL_CH2);                                                             // PE1
  ADCSequenceStepConfigure(ADC0_BASE, ADC_INT_SS0, 2, ADC_CTL_CH3);                                                             // PE0
  ADCSequenceStepConfigure(ADC0_BASE, ADC_INT_SS0, 3, ADC_CTL_CH4);                                                             // PD3
  ADCSequenceStepConfigure(ADC0_BASE, ADC_INT_SS0, 4, ADC_CTL_CH5 | ADC_CTL_IE | ADC_CTL_END); // PD2

  ADCSequenceEnable(ADC0_BASE, 0);

  //ADCIntRegister(ADC0_BASE, ADC_INT_SS0, &MyISR); // Started thinking about my own interrupt here.
  //ADCIntEnable(ADC0_BASE, ADC_INT_SS0);

  ADCIntClear(ADC0_BASE, ADC_INT_SS0);

  ADCProcessorTrigger(ADC0_BASE, 0);

  // Hangs Right Here!
  while(!ADCIntStatus(ADC0_BASE, ADC_INT_SS0, false))
  {
  }

  //ADCIntClear(ADC0_BASE, ADC_INT_SS0);

  ADCSequenceDataGet(ADC0_BASE, ADC_INT_SS0, ui32ADC0Value); // Watch on ui32ADC0Value

  ADCSequenceDisable(ADC0_BASE, ADC_INT_SS0);

  ADCIntDisable(ADC0_BASE, ADC_INT_SS0);

  System_printf("Data: %i \t %i \t %i \t %i \t %i \t %i \t %i \t \n", iCount, ui32ADC0Value[0], ui32ADC0Value[1], ui32ADC0Value[2], ui32ADC0Value[3],  ui32ADC0Value[4], ui32ADC0Value[5]);
  System_flush();

  return;
}