Synchronising SDFM in F28075

Prakash Kumar Thulasi Kumar

Expert 2015 points

Hi Guys,

In F28075's TRM it is mentioned as:

Here how can I make sure that only one CMPC or CMPD event per PWM cycle is generated in Up_Down count mode?

over 9 years ago

0 Manoj Santha Mohan over 9 years ago

TI__Guru 55700 points

Prakash,

Below configuration generates one CMPC event (when TBCTR is incrementing and not when TBCTR is decrementing) per PWM cycle.

EPwm11Regs.TBCTL.CTRMODE = 2; //Up Down mode
EPWM11.Regs.ETSEL.INTSEL = 4;
EPwm11Regs.ETSEL.INTSELCMP = 1;

Regards,
Manoj

0 Prakash Kumar Thulasi Kumar over 9 years ago in reply to Manoj Santha Mohan

Expert 2015 points

Hi Manoj,
I am using all 8 SD FIlters. So I need to generate one CMPC and one CMPD event in ePWM11 and respectively in ePWM12.

It seems with INTSEL, I can choose only one event(either CMPC or CMPD). Or is it possible to generate both event once in a time period in UP-Down count mode?

Also, is it possible to force these events via software, so that I can read the value and then reset the DOSR?

0 Manoj Santha Mohan over 9 years ago in reply to Prakash Kumar Thulasi Kumar

TI__Guru 55700 points

Prakash,

I don't think it is possible.

If you don't configure INTSEL and INTSELCMP, you will get 2 CMPC and CMPD events per time period in up-down count mode. If you use either Up count / down count mode, you will get one CMPC / CMPD event per time period.

Regards,
Manoj

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Synchronising SDFM in F28075