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TMS320F28379D: Configuration of HRPWM

Jay
Prodigy 190 points

Part Number: TMS320F28379D
Other Parts Discussed in Thread: C2000WARE

Hello,

I need some help configuring/understanding HRPWM feature.

In one of the example given (hrpwm_ex2_slider), they have not used SFO library. My understanding for flow is as follows,

1) we need to enable HRPWM module and mode of operation other configuration related to it in initialization function. Also initialize EPWM module.

2) Now, to check the working, I will load the CMPA_HR (8 bit ). (are any other configuration required to check high resolution on duty cycle or this would work?)

But the problem is that, they have disabled the period control/phase control  by following lines of code, 

HRPWM_disablePeriodControl(myEPWM1_BASE);
HRPWM_disablePhaseShiftLoad(myEPWM1_BASE);

With this can I able to get high resolution in duty cycle control. 

Thanks & Regards,

Jainam

  • 0
    TI__Mastermind 27110 points

    Hi Jainam,

    Jay said:
    With this can I able to get high resolution in duty cycle control. 

    I encourage you to look at the duty examples if you'd like to use duty cycle control:

    C:\ti\c2000\C2000Ware_version\driverlib\f2837xd\examples\cpu1\hrpwm\hrpwm_ex1_duty_sfo

    C:\ti\c2000\C2000Ware_version\driverlib\f2837xd\examples\cpu1\hrpwm\hrpwm_ex4_duty_updown_sfo

    Jay said:

    1) we need to enable HRPWM module and mode of operation other configuration related to it in initialization function. Also initialize EPWM module.

    2) Now, to check the working, I will load the CMPA_HR (8 bit ). (are any other configuration required to check high resolution on duty cycle or this would work?)

    I would recommend following the same format as presented in the examples I outlined above.

    Best Regards,

    Marlyn

  • 0 in reply to Marlyn Rosales Castaneda20
    Prodigy 190 points

    Hi Marlyn,
    Thanks for the quick reply.

    Marlyn Rosales Castaneda20 said:
    I encourage you to look at the duty examples if you'd like to use duty cycle control:

    Yeah I have checked the duty cycle examples as well, but can't we control HRPWM on duty cycle without SFO (By providing default MEP steps and calculating CMPA_HR value and directly assigning the calculated value to CMP register? 

    Regards,
    Jainam

  • 0 in reply to Jay
    TI__Mastermind 27110 points

    Hi Jainam,

    Jay said:
    Yeah I have checked the duty cycle examples as well, but can't we control HRPWM on duty cycle without SFO (By providing default MEP steps and calculating CMPA_HR value and directly assigning the calculated value to CMP register? 

    Yes this is true. The Technical Reference Manual provides examples within the HRPWM section on how to perform these calculations and the needed steps to configure hrpwm.

    Best Regards,

    Marlyn