Can a single EPWM cause 1+ interrupts

Salman Ahmed97

Hey

I am using EPWM to signal a switching amplifier and monitoring the current through an inductor via ADC.

I want to keep track of the positive pulse and zero of the EPWM, cause in each section of period I perform some calculations.

I was wondering if a single EPWM can cause two interrupts one at CNTR = CMPA and other at CNTR = PRD .

According to datasheet it seems that

EpwmXregs.ETSEL.bit.INTSEL can be set to allow just one Interrupt. Just want to confirm that whether there is some other setting to allow for two interrupts.

Regards

Salman

over 10 years ago

0 Subrahmanya over 10 years ago

TI__Mastermind 24095 points

Salman,Which device are you using?-Bharathi.

0 Salman Ahmed97 over 10 years ago in reply to Subrahmanya

Prodigy 110 points

oh, sorry about that. Forgot to mention it.

its an F28377s launchpad

0 Subrahmanya over 10 years ago in reply to Salman Ahmed97

TI__Mastermind 24095 points

Salman,
You can not directly use EpwmXregs.ETSEL.bit.INTSEL setting to generate 2 interrupts mentioned above.
But if you are keen on generating 2 INTs (i'm unclear about why you would need two though) - these are some options i can think of.
1. Use another PWM instance to be in time base SYNC with the current PWM instance and generate 2nd interrupt from there.
2. Use an ECAP instance time base SYNC with the current PWM instance and generate 2nd interrupt from there.
3. Generate one interrupt via EPWM (say Zero). Generate SOCA or B pulse (on CMPA) and route it to GPIO and loop it back as external interrupt.
and so on...-Bharathi.

0 Salman Ahmed97 over 10 years ago in reply to Subrahmanya

Prodigy 110 points

I think I will go with the first option you suggested.

Thanks .

0 Subrahmanya over 10 years ago in reply to Salman Ahmed97

TI__Mastermind 24095 points

Sure! Let me know if you run into any issues.

-Bharathi.

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Can a single EPWM cause 1+ interrupts