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Original question:

PWM on TMS570 with variable Duty Cycle and Frequency

TMS570LS1227: TMS570LS1227

Yaparla Venkata Akhil Kumar Reddy
Prodigy 250 points
Part Number: TMS570LS1227
Other Parts Discussed in Thread: HALCOGEN, AWR1642

Hi.team,

Iam using TMS570ls1227 pwm driver code for the first time, in these driver code i have  to change the duty cycle during the run time

can u please give me the solution for this??

Thanks

Akhil

  • 0
    TI__Guru**** 193196 points

    Hi Akhil,

    TMS570LS12x platforms do have dedicated ePWM module, and the N2HET can also be used to generate PWM signals at N2HET pins. Which module do you use for PWM?

    For using N2HET, you can use the API generated by HALCoGen to update the duty-cycle and period:

    pwmSetDuty(hetRAMBASE_t * hetRAM, uint32 pwm, uint32 pwmDuty)

    For ePWM, there is no API, but you can write to etpwmREGx->CMPA  and etpwmREGx->CMPA to change the duty cycle of PWMA and PWMB.

  • 0 in reply to QJ Wang
    Prodigy 250 points

    Hi..QJ wang

    iam using the AWR1642 module, in this we  have a epwm module

    we have downloaded the etpwm driver from hercules. In these driver how to change the dutycycle during run time??

    Thanks

    Akhil

  • 0 in reply to Yaparla Venkata Akhil Kumar Reddy
    TI__Guru**** 193196 points

    Hi Akhil,

    There is no API to modify the dutycycle of PWM signals. You need to program etpwmREGx->CMPA  and etpwmREGx->CMPA to change the duty cycle of PWMA and PWMB manually.