TMS320F28075: Outputting ADCSOCA0 pulse on a GPIO

Hi Leelakrishna,

Our expert will get back on this issue today.

Hello Leelakrishna,

Did you enable SOCAEN in the ETSEL register as well as in the ADCSOCOUTSELECT register?

If so, would you mind sharing the rest of your code?

Hi Luke,

Thank you for your reply. SOCAEN in the ETSEL register as well as in the ADCSOCOUTSELECT register are set. Otherwise, I wouldn't seen the pulse in first place with first event ( s_pEpwm7Regs->ETPS.bit.SOCAPRD = ET_1ST; // trigger on every 1st event ). I am only facing problem if it is configured for other than 1st event ( like 2nd or 3rd )

Could you try using the ETSOCPS[SOCAPRD2] field to select your prescaler instead of the ETPS[SOCAPRD] field? I am not sure how you could only be getting an improper output when using that particular prescaler setting, but driverlib uses the ETSOCPS register for all prescale values including 0-3. It's possible your ETPS[SOCPSSEL] bit was selecting the wrong prescaler period but this should be 0 by default.

Are you suggesting to set ETPS[SOCPSSEL] bit be set to '0'. Shouldn't ETPS[SOCPSSEL] bit be set to '1' in order ETSOCPS[SOCAPRD2] field to be used as a pre-scalar?

here is description from datasheet:

Apologies for the confusion, I was suggesting you test both of the prescale methods: either ETPS[SOCPSSEL] = 0 and setting your period in the ETPS[SOCAPRD] field, or setting ETPS[SOCPSSEL] = 1 and setting your period in ETSOCPS[SOCAPRD2]. The code you shared in your original question looks correct. I sent you a e2e friend request if you'd like to share more of your code in a private thread.