how fast is capture?

imanpakii · ‎2012-09-18

Posted on September 19, 2012 at 01:53

Hi every one

is anyone know about pulse capturing in stm32f4 ,how fast is it? and how accurate is it i wana measure 1mhz pulse with 0.2% error is stm32f4 able to do that?

thank you

Tesla DeLorean · ‎2012-09-18

Posted on September 19, 2012 at 04:38

No, I think you'd need a 500 MHz sample clock to do that, ie 2 ns granularity.

And you'd want a more accurate input clock.

You could, I guess, integrate but that would require a series of pulses at the frequency rather than a singular pulse the question infers.

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imanpakii · ‎2012-09-19

Posted on September 19, 2012 at 18:43

thank you clive1

what frequency can i measure with 0.2% accuracy ?

Is stm32f4 is suitable for measure frequency.I used of TIM_PWM_INPUT example but it's seems it doesn't accurate it's have big variation even in low frequency such as 20~60 khz.

imanpakii · ‎2012-09-19

Posted on September 19, 2012 at 18:44

thank you clive1

what frequency can i measure with 0.2% accuracy ?

Is stm32f4 is suitable for measure frequency.I used of TIM_PWM_INPUT example but it's seems it doesn't accurate it's have big variation even in low frequency such as 20~60 khz.