How to use DMA to change PWM frequency?

[Xli.1]

hi guys. I want to use DMA to change the PWM frequency in the pwm running. I used DMA to change the ARR of Tim, but it was failed. So how to change the pwm frequency by DMA?

[waclawek.jan]

By changing ARR of TIM. You'll need to have ARR preload enabled (TIMx_CR1.ARPE=1)..

> I used DMA to change the ARR of Tim, but it was failed.

Post details.

JW

[berendi]

AN4776 Application note General-purpose timer cookbook has some nice examples