ADAU1701 and SigmaTcp - Header mismatch

Question

Hey All, 
 I was trying to configure an ADAU1701 connected to a raspberry pi (over an i2c bus, running Raspbian) using SigmaTcp. Unfortunately, I was unable to do that in the first attempt. I analyzed the TCPIP packages sent by SigmaStudio using wireshark and I noticed that the header was different from the one that SigmaTcp was waiting. Sigma tcp waits for a 8 bytes header, with length in the bytes 4 and 5, and addr in the bytes 6 and 7. SigmaStudio sends a 10 bytes header with length in the bytes 6 and 7, and addr in the bytes 8 and 9. After some changes in function handle_connection on sigma-tcp.c, I was able to control the chip over a TCP/IP connection. 
 Is there a different version of sigma tcp to be used with ADAU1701? I searched in this forum and couldn't find anyone with the same problem, so I decided to post this. 
 Thanks! 
 Lucas@

lucasolim · Answer

You have to adequate the size of the header and the position of the information in the right places. SigmaStudio works with a 10 bytes header, instead of 8. You will have to place a few changes in the function handle_connection in sigma_tcp.c 
 lines 163, 166 and 167: 
 while (count >= 9 ) 
 len = (p[ 6 ] << 8 ) | p[ 7 ]; 
 addr = (p[ 8 ] << 8 ) | p[ 9 ]; 
 lines 184 and 185: 
 p += 10 
 count -= 10 
 lines between 180 and 192: replace all "8" with "10".

axeljaeger · Answer

Hello Lucas, 
 yes we already figured out how to read. Our own application running on the pi works for both reading and writing. Only SigmaTCP using the provided patches is only able to write to the DSP but is unable to read. Unfortunately, we cannot patch SigmaTCP the same way for reading as we did for writing because SigmaStudio is the black box and we can only guess how the packets need to be modified for SigmaStudio to accept them. 
 Best regards 
 Axel

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ADAU1701 and SigmaTcp - Header mismatch