C6747 - Changing mark/space ratio on the PWM

Rex Taylor75

What is the fastest way to program/update the mark/space ratio of the PWM. Should it be done via ISR/IST or can the eDMA3 controller be used.

Thanks for your help R

over 8 years ago

0 Sivaraj Kuppuraj over 8 years ago

TI__Mastermind 35645 points

Hi,

To my knowledge, PWM duty cycle outputs would be limited by the controller or the driver.

So, PWM duty ratio would vary according to the limitations held by the controller.

Thanks & regards,

Sivaraj K

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0 Rex Taylor75 over 8 years ago

Prodigy 140 points

Just to clarify, are you saying the most efficient way is to change the duty cycle comparator register as needed, while servicing the ISR/IST?

Do you know what the limitations are in terms of the maximium frequency of the PWM is and still be able to service the interrupts on a 1:1 bases? So, for example if I wished to change the duty cycle every period of the PWM.

Thanks you

0 Sivaraj Kuppuraj over 8 years ago in reply to Rex Taylor75

TI__Mastermind 35645 points

Hi,

Yes, you could appropriately control the duty cycle variations througher control registers.

Thanks & regards,

Sivaraj K

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C6747 - Changing mark/space ratio on the PWM