SAADC sample doesn't appear to be working

Question

Hi, 
 I am ultimately trying to move from version 2.3.0 of the sdk to 2.6.1. I have an nrf52_dk board i want to try and test the "different" way that the sdk is now doing saadc. Our custom board works fine with sdk 2.3.0 using ppi and rtc to trigger sampling. The problem is that the sample doesnt appear to be working. I found the loopback pin guide and jumped p0.03 and p0.31 and all that I get when the bard is flashed is the [00:00:00.381,469] <inf> NRFX_EXAMPLE: Starting nrfx_saadc advanced non-blocking sampling with internal timer example. Line. 
 
 For a little more background our current code wont compile at all with version 2.6.1 so i am starting with an example and will work to move that example to my custom board. That being said, i really need to know what the LOOPBACK Pins being jumped is doing because our board wont be doing that specifically, we have a variable voltage being applied and we need to read it. 
 
 Brian

finkbr · Answer

After a bunch more playing around, I was able to get the example to work. If you could just answer the last bit about what the loopack pins are doing so I can understand what's going on I'd appreciate it. I need to make tis example work on my custom board next. Then you can close this ticket.