FAQ: SPORTs Synchronization in SHARC EE-377 Talkthrough Example

Document created by Kader.M Employee on Nov 21, 2017
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Question:

 

I'm looking into the source of the EE 377 Audio Talkthrough example and I read in the paper:

 

The SPORT allocated to SHARC #2 is synchronized with the SPORT allocated to SHARC #1 during
initialization. After the MDMA completion interrupt occurs, SHARC #2 has almost one whole frame worth
of time before its SPORT callback function expects another frame.

 

I cannot find the part of the code that synchronizing SPORT of SHARC #2 to SPORT of SHARC #1. Can anyone point me to the part of code that ensures this synchronization is done? I've looked in Adau1962Interface.c file but couldn't find this.

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Answer:

 

The synchronization occurs in the code below. The DAC is enabled after the second SHARC receives the first audio packet from the first SHARC. 

 

if( DacStarted == 0 && RXBuffersReceived > 0 )
{
// Enable audio output
Adau1962Enable();
DacStarted = 1;
// fprintf(stdout, "Core2: DAC Started\n" ); // EMG - 071116 - Removed to avoid sync issues
}

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