TMS320F28027: Adc Interrupt Problem

Matthew Pate a sincere thanks for addressing my problem.... As per ur advice I have considered to use pwm to generate source but even after setting the source trigger to pwm1 and deleting the force interrupt the interrupt is not being generated.... Actually I am working on this for about two days and I have tried all possible combinations of trigger sources but interrupt is not being generated for any case..... Can you guess what else might me the problem? I have not checked for different interrupts I have check only for int1 of adc....

Ashwin,

Can you check for the ADCINTOVF flags as well? Interrupts may not work properly if any of the ADCINTOVF flags are set.

-Tommy

Thanks Tommy
I checked and the ADCINTOVF.INT1 is always 0. Any other ideas? :(

Ashwin,
Can you try the example in C2000 Ware here: C:\ti\c2000\C2000Ware_1_00_03_00\device_support\f2802x\examples\drivers\adc_soc\. This also uses ADC Interrupt, so I want to make sure this works and we can work backward from there as to the delta's with your code.

Matt

AS per your request used that example. In addition to it I used a GPIO7 pin to see if the interrupt is occurring. But the interrupt is not occurring. The coding is as follows.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//#############################################################################
//
// File: f2802x_examples_ccsv4/adc_soc/Example_F2802xAdcSoc.c
//
// Title: F2802x ADC Start-Of-Conversion (SOC) Example Program.
//
// Group: C2000
// Target Device: TMS320F2802x
//
//! \addtogroup example_list
//! <h1>ADC Start-Of-Conversion (SOC)</h1>
//!
//! Interrupts are enabled and the ePWM1 is setup to generate a periodic
//! ADC SOC - ADCINT1. Two channels are converted, ADCINA4 and ADCINA2.
//!
//! Watch Variables:
//!
//! - Voltage1[10] - Last 10 ADCRESULT0 values
//! - Voltage2[10] - Last 10 ADCRESULT1 values
//! - ConversionCount - Current result number 0-9
//! - LoopCount - Idle loop counter
//
// (C) Copyright 2012, Texas Instruments, Inc.
//#############################################################################
// $TI Release: LaunchPad f2802x Support Library v100 $
// $Release Date: Wed Jul 25 10:45:39 CDT 2012 $
//#############################################################################

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

#include "f2802x_common/include/adc.h"
#include "f2802x_common/include/clk.h"
#include "f2802x_common/include/flash.h"
#include "f2802x_common/include/gpio.h"
#include "f2802x_common/include/pie.h"
#include "f2802x_common/include/pll.h"
#include "f2802x_common/include/wdog.h"

// Prototype statements for functions found within this file.
interrupt void adc_isr(void);
void Adc_Config(void);

// Global variables used in this example:
uint16_t LoopCount;
uint16_t ConversionCount;
uint16_t Voltage1[10];
uint16_t Voltage2[10];

ADC_Handle myAdc;
CLK_Handle myClk;
FLASH_Handle myFlash;
GPIO_Handle myGpio;
PIE_Handle myPie;
PWM_Handle myPwm;

void main(void)
{

CPU_Handle myCpu;
PLL_Handle myPll;
WDOG_Handle myWDog;

// Initialize all the handles needed for this application
myAdc = ADC_init((void *)ADC_BASE_ADDR, sizeof(ADC_Obj));
myClk = CLK_init((void *)CLK_BASE_ADDR, sizeof(CLK_Obj));
myCpu = CPU_init((void *)NULL, sizeof(CPU_Obj));
myFlash = FLASH_init((void *)FLASH_BASE_ADDR, sizeof(FLASH_Obj));
myGpio = GPIO_init((void *)GPIO_BASE_ADDR, sizeof(GPIO_Obj));
myPie = PIE_init((void *)PIE_BASE_ADDR, sizeof(PIE_Obj));
myPll = PLL_init((void *)PLL_BASE_ADDR, sizeof(PLL_Obj));
myPwm = PWM_init((void *)PWM_ePWM1_BASE_ADDR, sizeof(PWM_Obj));
myWDog = WDOG_init((void *)WDOG_BASE_ADDR, sizeof(WDOG_Obj));

// Perform basic system initialization
WDOG_disable(myWDog);
CLK_enableAdcClock(myClk);
(*Device_cal)();

//Select the internal oscillator 1 as the clock source
CLK_setOscSrc(myClk, CLK_OscSrc_Internal);

// Setup the PLL for x10 /2 which will yield 50Mhz = 10Mhz * 10 / 2
PLL_setup(myPll, PLL_Multiplier_10, PLL_DivideSelect_ClkIn_by_2);

// Disable the PIE and all interrupts
PIE_disable(myPie);
PIE_disableAllInts(myPie);
CPU_disableGlobalInts(myCpu);
CPU_clearIntFlags(myCpu);

// If running from flash copy RAM only functions to RAM
#ifdef _FLASH
memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
#endif

// Setup a debug vector table and enable the PIE
PIE_setDebugIntVectorTable(myPie);
PIE_enable(myPie);

// Register interrupt handlers in the PIE vector table
PIE_registerPieIntHandler(myPie, PIE_GroupNumber_10, PIE_SubGroupNumber_1, (intVec_t)&adc_isr);

// Initialize the ADC
ADC_enableBandGap(myAdc);
ADC_enableRefBuffers(myAdc);
ADC_powerUp(myAdc);
ADC_enable(myAdc);
ADC_setVoltRefSrc(myAdc, ADC_VoltageRefSrc_Int);

// Enable ADCINT1 in PIE
PIE_enableAdcInt(myPie, ADC_IntNumber_1);
// Enable CPU Interrupt 1
CPU_enableInt(myCpu, CPU_IntNumber_10);
// Enable Global interrupt INTM
CPU_enableGlobalInts(myCpu);
// Enable Global realtime interrupt DBGM
CPU_enableDebugInt(myCpu);

LoopCount = 0;
ConversionCount = 0;

// Configure ADC
//Note: Channel ADCINA4 will be double sampled to workaround the ADC 1st sample issue for rev0 silicon errata
ADC_setIntPulseGenMode(myAdc, ADC_IntPulseGenMode_Prior); //ADCINT1 trips after AdcResults latch
ADC_enableInt(myAdc, ADC_IntNumber_1); //Enabled ADCINT1
ADC_setIntMode(myAdc, ADC_IntNumber_1, ADC_IntMode_ClearFlag); //Disable ADCINT1 Continuous mode
ADC_setIntSrc(myAdc, ADC_IntNumber_1, ADC_IntSrc_EOC2); //setup EOC2 to trigger ADCINT1 to fire
ADC_setSocChanNumber (myAdc, ADC_SocNumber_0, ADC_SocChanNumber_A4); //set SOC0 channel select to ADCINA4
ADC_setSocChanNumber (myAdc, ADC_SocNumber_1, ADC_SocChanNumber_A4); //set SOC1 channel select to ADCINA4
ADC_setSocChanNumber (myAdc, ADC_SocNumber_2, ADC_SocChanNumber_A2); //set SOC2 channel select to ADCINA2
ADC_setSocTrigSrc(myAdc, ADC_SocNumber_0, ADC_SocTrigSrc_EPWM1_ADCSOCA); //set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
ADC_setSocTrigSrc(myAdc, ADC_SocNumber_1, ADC_SocTrigSrc_EPWM1_ADCSOCA); //set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
ADC_setSocTrigSrc(myAdc, ADC_SocNumber_2, ADC_SocTrigSrc_EPWM1_ADCSOCA); //set SOC2 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1, then SOC2
ADC_setSocSampleWindow(myAdc, ADC_SocNumber_0, ADC_SocSampleWindow_7_cycles); //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
ADC_setSocSampleWindow(myAdc, ADC_SocNumber_1, ADC_SocSampleWindow_7_cycles); //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
ADC_setSocSampleWindow(myAdc, ADC_SocNumber_2, ADC_SocSampleWindow_7_cycles); //set SOC2 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)

// Enable PWM clock
CLK_enablePwmClock(myClk, PWM_Number_1);

// Setup PWM
PWM_enableSocAPulse(myPwm); // Enable SOC on A group
PWM_setSocAPulseSrc(myPwm, PWM_SocPulseSrc_CounterEqualCmpAIncr); // Select SOC from from CPMA on incr
PWM_setSocAPeriod(myPwm, PWM_SocPeriod_FirstEvent); // Generate pulse on 1st event
PWM_setCmpA(myPwm, 0x0080); // Set compare A value
PWM_setPeriod(myPwm, 0xFFFF); // Set period for ePWM1
PWM_setCounterMode(myPwm, PWM_CounterMode_Up); // count up and start

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
GPIO_setPullUp(myGpio, GPIO_Number_7, GPIO_PullUp_Enable);
GPIO_setHigh(myGpio, GPIO_Number_7);
GPIO_setMode(myGpio, GPIO_Number_7, GPIO_7_Mode_GeneralPurpose);
GPIO_setDirection(myGpio, GPIO_Number_7, GPIO_Direction_Output);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
// Wait for ADC interrupt
for(;;)
{
LoopCount++;
}

}


interrupt void adc_isr(void)
{

GPIO_setLow(myGpio, GPIO_Number_7);
//discard ADCRESULT0 as part of the workaround to the 1st sample errata for rev0
Voltage1[ConversionCount] = ADC_readResult(myAdc, ADC_ResultNumber_1);
Voltage2[ConversionCount] = ADC_readResult(myAdc, ADC_ResultNumber_2);

// If 10 conversions have been logged, start over
if(ConversionCount == 9)
{
ConversionCount = 0;
}
else ConversionCount++;

// Clear ADCINT1 flag reinitialize for next SOC
ADC_clearIntFlag(myAdc, ADC_IntNumber_1);
// Acknowledge interrupt to PIE
PIE_clearInt(myPie, PIE_GroupNumber_10);

return;
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Please Help!

Ashwin,

Glad we found the issue. Could you provide the version of C2000Ware you are using wrt the Clock Enable Missing?  I believe this is fixed in the V 1_00_03_00 I have, but want to make sure there are not some packages with this incorrect that I am not aware of.

Thanks,
Matthew