Associate

Question

How to change NUCLEO-G431KB PWM duty cycle

I use the PWM output example code of STM32CubeIDE,

how do I modify the duty cycle of the PWM, I can't find a way to modify it

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ST Employee

Hello Jason,

You can simply change the PULSE_VALUE in the main.h

Regards,
Stassen

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Associate

Hi Stassen,

Thanks for your reply.

But I have a question,

I find this code but I can't understand how to change the PULSE_VALUE,

example code is output PWM has a 90% duty cycle, if change 50% duty cycle how to set the PULSE_VALUE?

Associate II

hello @Jason_fx

you can simply set "duty * counter-base-period" to "Compare Register" just like followings..

where V_TIM_Cbase is defined in configration as below.

hope this could help

regards

Super User

Hello @Jason_fx

TIMx channels duty cycle = (TIMx_CCR1/ (TIMx_ARR + 1))*100.

You can change the values off TIMx_CCR1 and TIMx_ARR to modify the duty cycle value.

Best regards.

II

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