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TMS320F28035: Workshop LAB 7 EPWM: Change EPWM from 10 Khz to 800 Khz

robin gangopadhya18
Mastermind 6276 points
Part Number: TMS320F28035
Other Parts Discussed in Thread: C2000WARE

Hello TI community

I am working on the different EPWM and range of the frequency from 10 Khz to 800 Khz, I follow the one-day workshop, moreover, in lab 7, I see there is the code for 2 Khz. I have tried to modify that for my desired range but it won't work. Can you please tell me how to change the period of the "PWM_Half_Period"? I have tried to change that number below 13000 (for higher frequency 10 Khz to 800 Khz) but it doesn't work. Is there a limitation for certain frequencies? If yes then how I can change that limits?



Thanks

RG

  • +1
    TI__Mastermind 42195 points

    RG,

    There is no limitation on the PWM frequency you should be able to meet this frequency range. I suspect that something else is overwriting the value you have input.

    How were you adjusting the PWM frequency? Did you read back the TBPRD value during execution?

    I assume you have been modifying lab 7, for simplicity I would recommend that you start from a basic PWM example from C2000Ware.

    C:\ti\c2000\C2000Ware_3_04_00_00\device_support\f2803x\examples\c28\epwm_updown_aq

    From there it's just a matter of modifying TBPRD.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Mastermind 6276 points

    Thank you so much, Cody, Yes that file helped me.

    RG