Part Number: TMS320F280049C
Tool/software:
Hi，
when I use dsp280049c to implement phase shift , encountered PWM sometimes missing a cycle.
my phase shift configuration as below:
set PWM1 as master，set PWM2 as slave related with PWM1 and load phase shift register value when PWM1 "EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO" .
set PWM3 as another slave relate with PWM2，and load phase shift register value when PWM2“EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO”
some part code：
EPWM_setSyncOutPulseMode(EPWM1_BASE, EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO);
PWM_setPhaseShift(EPWM2_BASE, 250);//250= 90degree
EPWM_setCountModeAfterSync(EPWM2_BASE,EPWM_COUNT_MODE_UP_AFTER_SYNC);
EPWM_setSyncOutPulseMode(EPWM2_BASE, EPWM_SYNC_OUT_PULSE_ON_COUNTER_ZERO);
EPWM_setCountModeAfterSync(EPWM3_BASE, (EPWM_SyncCountMode)EPWM_COUNT_MODE_DOWN_AFTER_SYNC);
EPWM_setPhaseShift(EPWM3_BASE, DAB_PhaseShift_ticks);
then in ADC interrupt update both PWM2 and PWM3 phase shift value each time ，then sometimes PWM3 will occured PWM missing for a cycle, waveform as below:
But if I only update PWM3 phase shift ，and set PWM2 phase shift as a fixed valued ，the PWM3 will be OK, I don‘t know why this? can you give some guidance about it? thanks
