Tool/software: Code Composer Studio
Hello,
I am working on a full bridge inverter. I have had success with 4 pwm signals at 20 kHz using the sine table to achieve an open loop output. It uses an EPWM ISR to update the duty cycle from the sine table. I am currently working on a closed loop solution. I am trying to calculate the RMS value of the output 60 Hz waveform using the ADC. When I try to set timer1 for 16.67 mS (60Hz) my EPWM ISR is ignored. I am having trouble running both ISRs at once. Here is some pieces of my code (main and timer ISR) to see if anyone can spot the problem:
void main(void)
{
InitSysCtrl(); //Basic Core Init from DSP2833x_SysCtrl.c
EALLOW;
SysCtrlRegs.WDCR= 0x00AF; //Re-enable the watchdog
EDIS; //0x00AF to NOT disable the Watchdog, Prescaler = 64
DINT; //Disable all interrupts
Gpio_select();
Setup_ePWM(); //init of ePWM1A
InitPieCtrl(); //basic setup of PIE table; from DSP2833x_PieCtrl.c
InitPieVectTable(); //default ISR's in PIE
InitAdc();
EALLOW;
PieVectTable.TINT0 = &cpu_timer0_isr;
EDIS;
InitCpuTimers(); // basic setup CPU Timer0, 1 and 2
ConfigCpuTimer(&CpuTimer0,150,833);
CpuTimer0Regs.TCR.bit.TSS = 0;
EALLOW;
PieVectTable.EPWM1_INT = &ePWM_compare_isr;
EDIS;
PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
PieCtrlRegs.PIEIER3.bit.INTx1 = 1;
IER |= 1; \
IER |= M_INT1;
EINT;
ERTM;
// Configure ADC
AdcRegs.ADCMAXCONV.all = 0; // Setup 1 conv's on SEQ1
AdcRegs.ADCCHSELSEQ1.bit.CONV00 = 0x3; // Setup ADCINA3 as 1st SEQ1 conv.
AdcRegs.ADCTRL2.bit.EPWM_SOCA_SEQ1 = 1;// Enable SOCA from ePWM to start SEQ1
AdcRegs.ADCTRL2.bit.INT_ENA_SEQ1 = 1; // Enable SEQ1 interrupt (every EOS)
value = 1;
while(1)
{
while(CpuTimer0.InterruptCount == 0)
CpuTimer0.InterruptCount = 0;
EALLOW;
SysCtrlRegs.WDKEY = 0x55; //service WD #1
EDIS;
}
}
interrupt void cpu_timer0_isr(void)
{
CpuTimer0.InterruptCount++;
value ++;
EALLOW;
SysCtrlRegs.WDKEY = 0xAA; // service WD #2
EDIS;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
Thanks for any help,
Joe
