No data output on sub node (AD2428)

Question

My system is as follows: Main node - 1 sub-node (it will become 2 sub-nodes later)

The main node generates TDM4 data with speaker-test (-c4 -r48000 -FS16_LE) (Only one of the 4 channels is activated.)

The subnode generates 50% duty cycles and intends to play them through TAS6422.

However, no data comes out of the sub node, and only some noise is generated.

Which setting might be wrong? 
 Thank you. Eunsang Ko

Brewster · Accepted Answer

TLDR: 
 
 Start with a simple 2 node setup transporting stereo audio in one direction 
 Use the ADAU1452 to generate known data to eliminate trying to get some ADC/external I2S thing involved 
 Only change one thing at a time - like generate 4 channels instead of 2 put leave everything else the same, then transport the 4, etc 
 If really stuck look at the A2B bus itself to make sure the data is making it on to the bus 
 
 Not sure if you're still stuck, but since you have the WDZ boards I would drop back and run one of the examples that's available so you can see how it's set up. Sometimes when I'm chasing the "where did the signal go" problems - particularly for lots of channels - I'll put some sinewave generators at different frequencies on the ADAU1452. Then I can confirm routing is doing what I think as well as it will expose clock edge problems. The AD2428 settings don't mean much on their own - you have to get both ends to agree. Also remember the word size on the i2S port is not the same as what A2B will transport so that's another place to make a mistake. When I get really stuck I put a scope probe on the A2B signals as you an see what it's transporting and is the data changing or not (see TRM for details).)

SLA Status	Assignee	Support Status
SLA Closed. Missed after 74 hours		Awaiting Company Response

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No data output on sub node (AD2428)

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