epwm configuration problem....

Hi,

I'm having trouble triggering an interrupt on epwm3 int (epwm1-2 works fine with the same settings).

Aside from the registers I've set below, are there additional registers that need to be setup for epwm3 to interrupt?

I've attached my test project.

void _epwmSetup(void) {

  EALLOW;

  // enable CLK to ePWM

  SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;

  // enable interrupt

  // set up CPU IER group

  IER |= M_INT3;

  //SysCtrlRegs.PCLKCR1.bit.EPWM3ENCLK = 1;  // ePWM3 (this is already done in F2806x_SysCtrl.c)

  PieCtrlRegs.PIEIER3.bit.INTx3 = 1;      // EPWM-INT3

  asm (" NOP");

  asm (" NOP");

  asm (" NOP");

  asm (" NOP");

  asm (" NOP");

  // clear the PIEACK x bit for the peripheral group

  // write one to clear

  PieCtrlRegs.PIEACK.bit.ACK3 = 1;

  EDIS;

  EPwm3Regs.TBPRD = DDS_PERIOD - 1;

  EPwm3Regs.TBPHS.half.TBPHS = 0x0000;

  EPwm3Regs.TBCTR = 0x0000;                      // Clear counter

  // Setup counter mode

  EPwm3Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP;     // Count up

  EPwm3Regs.TBCTL.bit.PHSEN = TB_DISABLE;        // Disable phase loading

  EPwm3Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO;    // Sync out @ counter=zero

  EPwm3Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;       // Clock ratio to SYSCLKOUT

  EPwm3Regs.TBCTL.bit.CLKDIV = TB_DIV1;

  // setup interrupt on EPWM3

  EPwm3Regs.ETCLR.bit.INT = 1;                     // clear current interrupt

  EPwm3Regs.ETPS.bit.INTPRD = ET_1ST;        // Generate pulse on 1st event

  EPwm3Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO;  // Select interrupt mode 1. TBCTR=0 2. TBCTR=TBPRD 3. BOTH

  EPwm3Regs.ETSEL.bit.INTEN = 0;             // Disable interrupt

  EALLOW;

  SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1;

  EDIS;

}

// in main after calling _epwmSetup()...

// enable the epwm

    EPwm3Regs.ETCLR.bit.INT = 1;

    EPwm3Regs.ETSEL.bit.INTEN = 1;

// this is located at the end of the interrupt function // clear the interrupt

  EPwm3Regs.ETCLR.bit.INT = 1;

  PieCtrlRegs.PIEACK.all = M_INT3;

Thanks,

Chuck