TMS320F28P650DK: Unexpected Behavior with Force Trip Zone Event on EPWM

Reza Rezaii

Part Number: TMS320F28P650DK
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hi,

I've written a simple test code to generate PWM signals using EPWM1 and EPWM2, and both channels work as expected initially. To test the PWM stop functionality, I added a ForceTripZoneEvent to halt both EPWM1 and EPWM2.

However, I'm observing inconsistent behavior during debugging. Sometimes both EPWM1 and EPWM2 stop as intended, but other times only one of them stops—either EPWM1 or EPWM2. This inconsistency is confusing.

I also checked the OST (One-Shot Trip) register during debug sessions. Occasionally, it changes to 1 as expected, but sometimes it doesn't.

Could you help me understand why this behavior occurs and what might be causing the inconsistent response to the ForceTripZoneEvent

7 days ago

0 Reza Rezaii 7 days ago

Prodigy 60 points

I have added EPWM_setTripZoneAction to my code. However, it does not work well again.

+1 Prarthan Bhatt 6 days ago in reply to Reza Rezaii

TI__Genius 13425 points

Hi,

Please have a look at the EPWM force trip errata.

Thanks

0 Reza Rezaii 6 days ago in reply to Prarthan Bhatt

Prodigy 60 points

Thanks Prarthan for your response. That is right. with changing EPWMCLK = PLLSYSCLK the issue has been solved. To do this job, I added this line to my code:
SysCtl_setEPWMClockDivider(SYSCTL_EPWMCLK_DIV_1);

My sysconfig does not work well for this setting. By the way, thanks for solving the issue.

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TMS320F28P650DK: Unexpected Behavior with Force Trip Zone Event on EPWM