CCS/TMS320F28379S: How to sync PWMs?

Hi Paul,

Please follow this init methodology:

void InitEPwm() {
  
  EALLOW;
  SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0;  // This bit reset to 0 - Stops all PWM clocks.

  InitEPwm1();  
  InitEPwm2();  
  InitEPwm3();  
  InitEPwm4();  
  InitEPwm5();  
  InitEPwm6();  


  SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // This bit set to 1 - Turns ON all pwm clocks at the same time
  EDIS;
}

Regards,
Gautam

I did like this, but same result, about 20nsec time-difference between each PWM.

BR

Paul

One more question,
PWM4 is for ADC,

I call follow code after initialized all PWMs.

EALLOW;
SysCtl_disablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

EPWM_setTimeBaseCounter(EPWM1_BASE, 0U);
EPWM_setTimeBaseCounter(EPWM2_BASE, 0U);
EPWM_setTimeBaseCounter(EPWM3_BASE, 0U);
EPWM_setTimeBaseCounter(EPWM4_BASE, 0U);

SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);
EDIS;

----------
This is for PWM4 initial part

//
// Enable ADC interrupt
//
Interrupt_enable(INT_ADCA1);

//
// Start ePWM4, enabling SOCA and putting the counter in up-count mode
//
EPWM_enableADCTrigger(EPWM4_BASE, EPWM_SOC_A);
EPWM_setTimeBaseCounterMode(EPWM4_BASE, EPWM_COUNTER_MODE_UP);

.....

------
This is ADC interrupt

__interrupt void adcA1ISR(void)
{
isr_cnt ++;
#ifdef ADCPWM_TEST // for test
GPIO_writePin(6U, 1);
#endif

//
// Add the latest result to the buffer
//
mc[0].current_ADC = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER0);
mc[1].current_ADC = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER1);
mc[2].current_ADC = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER2);

#ifdef ADCPWM_TEST // for test
GPIO_writePin(6U, 0);
#endif
//
// Clear the interrupt flag and issue ACK
//
ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP1);
}

I set and clear some gpio to recognize the adc timing.
But, timing is different from PWM1~3 's timing.
I expected the ADC_ISR is called near by PWM1/2/3' start point.

How can I convert the ADC at just after PWM1/2/3 start point?

Last timing is for ADC

BR
Paul

Sangdo Lee said:

I did like this, but same result, about 20nsec time-difference between each PWM.

I'm not sure about the above API calls. Please refer:

C:\ti\c2000\C2000Ware_1_00_06_00\device_support\f2837xs\examples\cpu1\epwm_up_aq\cpu01

Complete ePWM initialization should be within TBCLKSYNC statements.

Regards,
Gautam

I can wait ;)