CCS/TMS320F28027F: CODE FOR SINE WAVE

Thanks Richard For you Reply, I got the point and made the necessary changes.

Thanks Cody for looking into it ,

I got you your point but Can you please help in deep understanding of this Interrupt function as this is my first time working with Interrupt ,though I understand it  but not able to implement as i am able to understand how actually this works.

Any help will be great .

Thank You 

Rahul   

Hey Cody,

I checked the output of the above code but nothing is obtained as output and i guess you were right the Code doesn't enter the ISR,after your suggestion i made a few changes ,so new code is written below.

Can you please help here and tell what's the problem and what can i d to solve it?

Thanks

Rahul

#include "DSP28x_Project.h"

#define Sine_TABLE_LENGTH 101
#define EPWM1_TIMER_TBPRD  1500

void GPIO_SELECT(void);
void INIT_ePWM1(void);
__interrupt void epwm1_int_isr(void);

#pragma DATA_SECTION(SineTable,"SineTableSection")

uint32_t SineTable[Sine_TABLE_LENGTH]={
 0x00000000,0x41bc646b,0x423c5e7a,0x428d3f6d,0x42bc46b4,0x42eb421a,0x430d1754,0x432484b3,0x433be7b1,0x43533ed4,0x436a88a2,0x4380e1d2,0x438c7731,0x439803b2,0x43a3869d,0x43aeff36,
 0x43ba6cc3,0x43c5ce8e,0x43d123dd,0x43dc6bfa,0x43e7a62e,0x43f2d1c4,0x43fdee08,0x44047d23,0x4409fae6,0x440f6ff4,0x4414dbf5,0x441a3e91,0x441f9771,0x4424e640,0x442a2aa7,0x442f6451,
 0x443492ea,0x4439b61e,0x443ecd9a,0x4443d90c,0x4448d822,0x444dca8c,0x4452affa,0x4457881c,0x445c52a4,0x44610f46,0x4465bdb4,0x446a5da3,0x446eeec8,0x447370d5,0x4477e38e,0x447c469f,
 0x44804ce2,0x44826e5d,0x4484879c,0x4486987e,0x4488a0e3,0x448aa0a8,0x448c97ae,0x448e85d4,0x44906afd,0x44924709,0x449419d9,0x4495e352,0x4497a355,0x449959c6,0x449b068b,0x449ca987,
 0x449e42a1,0x449fd1be,0x44a156c5,0x44a2d19e,0x44a44231,0x44a5a867,0x44a70429,0x44a85561,0x44a99bf9,0x44aad7de,0x44ac08fb,0x44ad2f3d,0x44ae4a92,0x44af5ae7,0x44b0602b,0x44b15a4f,
 0x44b24941,0x44b32cf4,0x44b40558,0x44b4d260,0x44b593ff,0x44b64a29,0x44b6f4d3,0x44b793f1,0x44b82779,0x44b8af63,0x44b92ba6,0x44b99c39,0x44ba0116,0x44ba5a36,0x44baa794,0x44bae92b,
 0x44bb1ef7,0x44bb48f4,0x44bb6720,0x44bb7978,0x44bb7ffc};

unsigned int IntCount;
char flag;

int main(void)
{
   #ifdef _FLASH
     memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
    #endif

   InitSysCtrl();

   GPIO_SELECT();
   DINT;

   InitPieCtrl();

   IER = 0x0000;
   IFR = 0x0000;

   InitPieVectTable();

   // Interrupts that are used in this example are re-mapped to
   EALLOW;
   PieVectTable.EPWM1_INT = &epwm1_int_isr;
   EDIS;

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

   INIT_ePWM1();

   EALLOW;
   SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;
   EDIS;

   IntCount = 0;
   flag = true;

   //Enable CPU INT3 which is connected to EPWM1-6 INT:
   IER |= M_INT2;

   PieCtrlRegs.PIEIER2.bit.INTx1 = 1;
   PieCtrlRegs.PIEIER2.bit.INTx2 = 1;
   PieCtrlRegs.PIEIER2.bit.INTx3 = 1;

   EINT;
   ERTM;

   for(;;)
      {
          __asm("          NOP");
      }
}

void GPIO_SELECT(void)
{
    EALLOW;
    GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0;

    GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;
    GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 1;

    GpioDataRegs.GPADAT.bit.GPIO0= 1;
    GpioDataRegs.GPADAT.bit.GPIO1= 1;

    EDIS;
}
void INIT_ePWM1(void)
{
    EPwm1Regs.TBPRD= EPWM1_TIMER_TBPRD ;
    EPwm1Regs.TBPHS.half.TBPHS= 0;
    EPwm1Regs.TBCTR= 0x0000;
    EPwm1Regs.CMPA.half.CMPA = SineTable[IntCount] ;
    EPwm1Regs.TBCTL.bit.CTRMODE = 0x2;
    EPwm1Regs.TBCTL.bit.PHSEN=0x0;
    EPwm1Regs.TBCTL.bit.HSPCLKDIV = 0x0;
    EPwm1Regs.TBCTL.bit.CLKDIV = 0x0;
    EPwm1Regs.TBCTL.bit.PRDLD=0x0;
    EPwm1Regs.TBCTL.bit.SYNCOSEL=0x1;
    EPwm1Regs.ETSEL.bit.INTSEL=0x1;
    EPwm1Regs.ETSEL.bit.INTEN=0x1;
    EPwm1Regs.ETPS.bit.INTPRD=0x1;
    EPwm1Regs.ETPS.bit.INTCNT=0x1;

    EPwm1Regs.CMPCTL.bit.SHDWAMODE = 0x0;
    EPwm1Regs.CMPCTL.bit.LOADAMODE = 0x0;

    EPwm1Regs.AQCTLA.bit.ZRO = 0x2;
    EPwm1Regs.AQCTLA.bit.CAU = 0x1;
    EPwm1Regs.AQCTLA.bit.CAD = 0x1;
};

__interrupt void epwm1_int_isr()
{
    if( flag == true && IntCount < 101)
    {
       IntCount++;
       if (IntCount == 101)
       {
           flag = false;
       }
    }
    else
    {
        flag = false;
        IntCount--;
        if (IntCount == 0)
          {
             flag = true;
          }
    }
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP3;
};