ADC Oversample with Scan - sanity check question

Question

I just want to double check something before I optimise an implementation. 
 If burst is enabled on multiple channels, let's say x256 for two channels, internally is the process doing: Read first channels x256 times then read second channels x256 times or Read first channel, Read second channel, repeat 256 times 
 The documentation suggests it is the prior method however the implementation under-the-hood would give the same outcome just with the reads being done in or out of order. docs.nordicsemi.com/.../saadc.html 
 (Obviously I can just use the scan feature and am doing so but it's a memory hog.)

AHaug · Accepted Answer

Anyways, Read first channels x256 times then read second channels x256 times should be correct. See RE: How does the SAADC "Scan" mode use the "BURST=1" for more details. Carstens answer matches my understanding of it atleast 
 Kind regards, Andreas

snoopy20 · Answer

It's my understanding as well, but under-the-hood it might be doing each in sequence when multiple channels are enabled. It would need an engineer familiar with the underlying hardware implementation to verify.

ADC Oversample with Scan - sanity check question

Top Replies