Sample and store a sine wave using ADC of piccolo mcu controlstick(f28027)

Can somebody help me a little?

please reply..it is really important..

Can anybody tell me why this code is not sampling a 110Khz sine wave. I am trying to store 100 samples.

#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

// Prototype statements for functions found within this file.

interrupt void adc_isr(void);

void Adc_Config(void);

// Global variables used in this example:

Uint16 LoopCount;

Uint16 ConversionCount;

Uint16 Voltage1[100];

//Uint16 Voltage2[100];

main()

{

// Step 1. Initialize System Control:

// PLL, WatchDog, enable Peripheral Clocks

// This example function is found in the DSP2803x_SysCtrl.c file.

   InitSysCtrl();

// Step 2. Initialize GPIO:

// This example function is found in the DSP2802x_Gpio.c file and

// illustrates how to set the GPIO to it's default state.

// InitGpio();  // Skipped for this example

// Step 3. Clear all interrupts and initialize PIE vector table:

// Disable CPU interrupts

   DINT;

// Initialize the PIE control registers to their default state.

// The default state is all PIE interrupts disabled and flags

// are cleared.

// This function is found in the DSP2802x_PieCtrl.c file.

   InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:

   IER = 0x0000;

   IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt

// Service Routines (ISR).

// This will populate the entire table, even if the interrupt

// is not used in this example.  This is useful for debug purposes.

// The shell ISR routines are found in DSP2802x_DefaultIsr.c.

// This function is found in DSP2802x_PieVect.c.

   InitPieVectTable();

// Interrupts that are used in this example are re-mapped to

// ISR functions found within this file.

   EALLOW;  // This is needed to write to EALLOW protected register

   PieVectTable.ADCINT1 = &adc_isr;

   EDIS;    // This is needed to disable write to EALLOW protected registers

// Step 4. Initialize all the Device Peripherals:

// This function is found in DSP2802x_InitPeripherals.c

// InitPeripherals(); // Not required for this example

   InitAdc();  // For this example, init the ADC

// Step 5. User specific code, enable interrupts:

// Enable ADCINT1 in PIE

   PieCtrlRegs.PIEIER1.bit.INTx1 = 1; // Enable INT 1.1 in the PIE

   IER |= M_INT1; // Enable CPU Interrupt 1

   EINT;           // Enable Global interrupt INTM

   ERTM;           // Enable Global realtime interrupt DBGM

   LoopCount = 0;

   ConversionCount = 0;

// Configure ADC 

EALLOW;

//AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1; //ADCINT1 trips after AdcResults latch

AdcRegs.INTSEL1N2.bit.INT1E     = 1; //Enabled ADCINT1

AdcRegs.INTSEL1N2.bit.INT1CONT  = 1; //enable ADCINT1 Continuous mode

AdcRegs.INTSEL1N2.bit.INT1SEL = 1; //setup EOC2 to trigger ADCINT1 to fire

AdcRegs.ADCSOC0CTL.bit.CHSEL = 4; //set SOC0 channel select to ADCINA4

AdcRegs.ADCSOC1CTL.bit.CHSEL = 4; //set SOC1 channel select to ADCINA4

//AdcRegs.ADCSOC2CTL.bit.CHSEL = 2; //set SOC2 channel select to ADCINA2

AdcRegs.ADCSOC0CTL.bit.TRIGSEL = 5; //set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1

AdcRegs.ADCSOC1CTL.bit.TRIGSEL = 5; //set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1

//AdcRegs.ADCSOC2CTL.bit.TRIGSEL = 5; //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2

AdcRegs.ADCSOC0CTL.bit.ACQPS = 6; //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)

AdcRegs.ADCSOC1CTL.bit.ACQPS = 6; //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)

//AdcRegs.ADCSOC2CTL.bit.ACQPS = 6; //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)

AdcRegs.ADCINTSOCSEL1.bit.SOC0  = 1;

AdcRegs.ADCINTSOCSEL1.bit.SOC1  = 1;

EDIS;

// Assumes ePWM1 clock is already enabled in InitSysCtrl();

   EPwm1Regs.ETSEL.bit.SOCAEN = 1; // Enable SOC on A group

   EPwm1Regs.ETSEL.bit.SOCASEL = 4; // Select SOC from from CPMA on upcount

   EPwm1Regs.ETPS.bit.SOCAPRD = 1; // Generate pulse on 1st event

   EPwm1Regs.CMPA.half.CMPA = 0x0080; // Set compare A value

   EPwm1Regs.TBPRD = 0xFFFF; // Set period for ePWM1

   EPwm1Regs.TBCTL.bit.CTRMODE = 0; // count up and start

// Wait for ADC interrupt

   for(;;)

   {

      LoopCount++;

   }

}

interrupt void  adc_isr(void)

{

  Voltage1[ConversionCount] = AdcResult.ADCRESULT1;  //discard ADCRESULT0 as part of the workaround to the 1st sample errata for rev0

 // Voltage2[ConversionCount] = AdcResult.ADCRESULT2;

  // If 200 conversions have been logged, start over

  if(ConversionCount == 100)

  {

     ConversionCount = 0;

  }

  else ConversionCount++;

  //AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //Clear ADCINT1 flag reinitialize for next SOC

  PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE

  return;

}

Which ADC channel are you supposed to be sampling the sine wave on?  Also if you set a breakpoint in adc_isr, does execution stop there and are new values being written to the Voltage1 array?

I am using ADCIN4 ie pin 5 of piccolo control stick. I am trying to understand the concept of EOC but it is not cleared yet in my mind.

YES, the adc_isr stops if I set a breakpoint @conversioncount=0; and new values are written but all the values(16 bit unsigned integer) are in the same range or sometime all the 100 values are just zero.