I'm using a STM32F429I discovery with HAL drivers. Is there a sample code showing how to change the duty cycle of a timer working in PWM output mode at run-time? Thanks, Piero

[TDK · Accepted solution]

You can just change the CCRx register directly. I don't think HAL has a function for doing only this. Pretty sure the LL library does.

For 50% duty:

TIMx->CCRx = (TIMx->ARR + 1) / 2;

For 25%/75% duty:

TIMx->CCRx = (TIMx->ARR + 1) / 4;

[waclawek.jan]

https://github.com/STMicroelectronics/STM32CubeF4/blob/master/Drivers/STM32F4xx_HAL_Driver/Inc/stm32f4xx_hal_tim.h#L1342 if you must have a HAL incantation for this.

JW

[Hicss.2033]

thanks for your answer, it works!!

[Hicss.2033]

I've find the solution in the following reply. Thanks for your support.