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AWR1642: Determining the index of the current chirp inside the chirp interrupt

Iman
Prodigy 160 points
Part Number: AWR1642

Hi,

I'm using the masterss firmware with AWR1642 and need to know the exact chirp index inside the chirpAvlIntHandler. One option is to use a simple counter and starts counting on with the very first chirp and resetting after numChirpsPerFrame is reached. I'm wondering if this is a reliable method, or there is probability of missing chirps which would devalidate the value of the counter. Another option is to use the frame start interrupt to sync the counter at least on the first chirps, but the questions is that if frame start interrupt is always fired before the chirp interrupt for the first chirp. 

I'd very appretiate any help.

Best Regards

Iman