Capture a timer value upon another timer update

justin239955_st · ‎2013-12-05

Posted on December 05, 2013 at 16:43

Hi,

I have two timer running TIM2 and TIM4. I would like to capture TIM4 counter value when TIM2 overflows (update). I do not wish to sample the value inside the ISR because i need precision. I would like to use something like an input capture but with the trigger being the TIM2 update instead of an outside event.

I feel like there is a simple solution there but just can't see it. Anyone has done that before?

Thanks,

Justin

#stm32-timer-capture-update

Tesla DeLorean · ‎2013-12-05

Posted on December 05, 2013 at 18:01

DMA Trigger?

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justin239955_st · ‎2013-12-05

Posted on December 05, 2013 at 19:37

Yes it looks like i'll try that.

Setup DMA1 CH2 to get triggered by TIM2_UP then the DMA transfers the value from TIM4->CNT to a RAM location later read is the TIM2_UP ISR...

Thanks