Inverting the PWM output in driver f281xpwm

Kim Jensen73

Hello,

is it possible to invert the 6 PWM output signals used by the f281xpwm driver ?

My thinking is that there might be an register in the F2812 that could be configured to giver inverted output ? (Just can't find them)

Thanks in advance for any answer to this question.

Best Regards,

Kim Jensen.

over 9 years ago

0 Richard Poley over 9 years ago

TI__Mastermind 27200 points

Kim,

The ACTRA register has 12 bitfields which configure the polarity of the 6 complementary pair PWM pins form event manager A. ACTRB does the same for EVB. These are documented in chapter 5.4 of the EV User's Guide (literature reference SPRU065E). Could you take a look at them to see if you can accomplish what you need?

Regards,

Richard

0 Kim Jensen73 over 9 years ago in reply to Richard Poley

Prodigy 240 points

Hello,
thanks for the feedback. The SPRU065E describes what is needed, great.

In the driver code following is defined (f281xpwm.h):
#define ACTR_INIT_STATE ( COMPARE1_AH + \
COMPARE2_AL + \
COMPARE3_AH + \
COMPARE4_AL + \
COMPARE5_AH + \
COMPARE6_AL )

I guess it should be changed too:
#define ACTR_INIT_STATE ( COMPARE1_AL + \
COMPARE2_AH + \
COMPARE3_AL + \
COMPARE4_AH + \
COMPARE5_AL + \
COMPARE6_AH )

Does that sound right ?

Best regards,
Kim Jensen.

0 Richard Poley over 9 years ago in reply to Kim Jensen73

TI__Mastermind 27200 points

Kim,

Sorry for the delayed reply. Yes, that looks correct to me.

Regards,

Richard

0 Kim Jensen73 over 9 years ago in reply to Richard Poley

Prodigy 240 points

Thank you very much.

Best Regards,

Kim.

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Inverting the PWM output in driver f281xpwm