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LP-AM261: EPWM generating a different frequency

Adwaith R Nath
Prodigy 60 points

Part Number: LP-AM261

Tool/software:

Hello,

I was trying to run an SDK example :epwm_hr_duty_cycle_am261x-lp_r5fss0-0_nortos_ti-arm-clang , which is expected to create a 1 khz, 25% duty  EPWM, but while I measure the frequency with 2 different DSO iam getting 1.25khz with 25% dutycycle.

Is this frequency deviation normal? 

  • 0
    TI__Expert 4230 points

    Hi Adwaith,

    It's due to the R5F clock being 500MHz and SYSCLK at 250MHz, EPWMCLK is directly derived from SYSCLK.

    The expected 1KHz frequency is for 200MHz EPWMCLK.

    Therefore, you are not facing any frequency deviation. You can change the epwm timebase divider values and confirm this.

    I'll file a ticket to mention this in the example!

    Thanks and regards,
    Akshit