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Oh wow, I was only looking at the data sheet. Thank you for the link to the reference manual.



Great point, I'll investigate more.

First off, thank you both for the quick and useful replies.



Looking at the doc again, pin 3 also corresponds to PWM4_B2 which might be IRQ_FLEXPWM4_2? Either way, I think I identified some...

The buffer is cyclical so new samples should be added to the beginning after filling up. Ideally the read index will be faster than the write index.



Those are good tips, thank you for that.
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I have an optical transmitter that encodes information into the position of pulses within a time duration (pulse position modulation). I'm trying to see if its possible to accurately and consistently...