Hello all, Still very new to the embedded systems world but really love the BBB so far! I have a project in which I have to sample 4 analog inputs very quickly (at least 44.1 kHz).
I initially thought of using an external ADC and hooking that up through the BBB's McASP interface, but on second thought, I'd like to try it with the BBB's built-in ADC, which although is less powerful and precise, might be able to do the trick (and would serve as a good stepping stone for more involved work if needed). So the idea is pretty straight-forward: use the PRU to read in the ADC signals, put in a circular buffer, and signal the other PRU as needed to transfer chunks to the main RAM for processing. However, I do worry about the sampling rate. Although the PRU is very deterministic, it seems like accesses through the L3/L4 interconnects are not, i.e. depending on bus load, copying from the ADC block to the PRU could take a varying amount of time. Is that correct? This would be an issue because sample points could drift and vary in timing. If that is indeed the case, what would be the best way to ensure consistent timing? Thanks in advance! -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
