CCS/TMS320F28027: Conflict with CPU Timer 1 and ADC Interrupts

Tool/software: Code Composer Studio

Hello everyone, 

I use a C2000 Piccolo LaunchPad evaluation board, equipped with the TMS320F28027 and I'm trying to implement a CPU Timer 1 Interrupt, every 1 sec, in order to automatically change the Comparator 2 internal reference set-point (Comp2Regs.RAMPMAXREF_SHWD), according to an exponential equation. In my code, I also use an ADC interrupt, for ADC conversion purposes. I thought that these 2 interrupts are independent. Although, it seems that the 2 interrupt functions do not operate properly. When I comment the line "IER = M_INT13", only the ADC Interrupt operates, whereas by commenting "IER = M_INT1", only the CPU Timer 1 interrupt operates. I attach you my main function, along with the 2 Interrupt function codes. For the Timer 1 interrupt, I used the "Example_2802xCpuTimer" as a guide. Please provide some help! 

Thanks a lot, in advance!

Nick

#include "DSP28x_Project.h"   
#include "stdio.h"    
#include "math.h"

__interrupt void cpu_timer1_isr(void);
interrupt void adc1_isr(void);

//...

void main()
{

#ifdef _FLASH
    memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
#endif

    InitSysCtrl();
    SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 0;
    DINT;

    InitPieCtrl();

    IER = 0x0000;
    IFR = 0x0000;

    InitPieVectTable();

EALLOW;  
       
PieVectTable.TINT1 = &cpu_timer1_isr;
       
EDIS;    

InitCpuTimers();   

ConfigCpuTimer(&CpuTimer1, 60, 1000000);

CpuTimer1Regs.TCR.all = 0x4001; 

IER |= M_INT13;


    EALLOW;
        
        PieVectTable.ADCINT1 = &adc1_isr;
        
    EDIS;

    InitGPIO();

    EALLOW;
        SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;
    EDIS;

    ADCConfig();
    InitADC();
    InitAIO();
    InitEPwm3Example();
    Comp();
    CompTripZone();
    scia_init();
    scia_fifo_init();

    EALLOW;
        SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
    EDIS;
    
    IER |=M_INT3;
    IER |= M_INT1;

    PieCtrlRegs.PIEIER3.bit.INTx1 = 1;  
    PieCtrlRegs.PIEIER1.bit.INTx1 = 1;     

    EINT;                                 
    ERTM;

    for(;;);
}

//...

interrupt void adc1_isr(void)
{
    if (button==1){
                EALLOW;
                    EPwm1Regs.TZCTL.bit.DCAEVT2=3;
                    EPwm1Regs.CMPA.half.CMPA = 0;                  
                    DELAY_US(ADC_usDELAY);
                    EPwm4Regs.CMPA.half.CMPA = 1500;
                EDIS;
    }

    temp=(3.3*AdcResult.ADCRESULT0)/4096;
    flag1=AdcResult.ADCRESULT0/16;                                  
    flag2=AdcResult.ADCRESULT4/16;    
    scia_xmit(flag1);
    sum=AdcResult.ADCRESULT0;
    sum=sum/1000;
    AV=AV+sum;
    if (pointer<1000)
     {  pointer=pointer+1;
     }
     else
     {
     RealVoltage=AV;
     AV=0;
     pointer =0;
}
      AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1;      //Clear ADCINT1 flag reinitialize for next SOC
      PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;    // Acknowledge interrupt to PIE
      return;
}

//...

__interrupt void cpu_timer1_isr(void)
{
   CpuTimer1.InterruptCount++;
   flag3=CpuTimer1.InterruptCount;
   if (CpuTimer1.InterruptCount<=120){
       temp1 = 58000;
   }
       else if ((CpuTimer1.InterruptCount>120) && (CpuTimer1.InterruptCount<=300)){
           temp1 = 58000*exp((-flag3+120)/(100+6*flag3));
       }
           else{
               temp1 = 52800;
           }
   Comp2Regs.RAMPMAXREF_SHDW=temp1;
}