TMS320F28P550SJ: What happens if the user sets TBCLKSYNC while EPWM counters are running and TBCLKSYNC has been already set?

Wayne Huang

Hi champs,

I am asking this for our customer.

The user wants us to clarify what happens if the user sets TBCLKSYNC while EPWM counters are running and TBCLKSYNC has been already set?

SysCtl_disablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);

Will running EPWM counters get correupted? Become zero?

Or there is no impact at all on all running EPWM counters?

8 months ago

0 Sumit Patil1 8 months ago

TI__Expert 6350 points

Wayne,

Yes disabling or enabling TBCLKSYNC while counter running or during runtime will cause either stop or run counter which may corrupt the ePWM. It should be only done during initialization. For example disable TBCLKSYNC --> configure ePWM --> enable TBCLKSYNC

Regards,

Sumit

0 Wayne Huang 8 months ago in reply to Sumit Patil1

TI__Genius 17205 points

Hi Sumit,

In this case, the user meant there is no disabling after enabling once. Only enable and then enable again. What happens to the second enable? Will this code affect anything?

+1 Sumit Patil1 8 months ago in reply to Wayne Huang

TI__Expert 6350 points

Wayne,

In that case it won't affect anything since clock is already enabled. So, even if there is instruction in ISR for re-enabling, it won't be affect the operation.

Regards,

Sumit

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TMS320F28P550SJ: What happens if the user sets TBCLKSYNC while EPWM counters are running and TBCLKSYNC has been already set?