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Sample a timer on EXTI interrupt

Question asked by Gornstar on Aug 12, 2013
Latest reply on Aug 12, 2013 by Clive One
Hi,
I want to sample a fast timer (125ns) when an EXTI interrupt occurs, before the interrupt is handled. Later when the interrupt is handled i want to be able to compare the actual value of the same timer and measure the interrupt latency.

How do i setup the capture of the timer after the exti is fired?
Should I use DMA?
I don't need code, only the general concept...

Thanks to all helper on this forum :)

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