Jerry > what are the specific roles of the DSP and your GPP (general purpose processor,
The DSP handles the encoding of an analog input to a digital stream, and also the decoding of a digital stream to analog output. The GPP handles control tasks -- set up of streams, working with files, etc. > I'm assuming you have a buffered interface between the GPP and the DSP - > that is absolutely required when crossing two clock domains as you have. Yes, we do have buffers. As Mr. Finlayson pointed out, the buffer sizes on the receiving end may not be large enough. > There should be some feedback from the DSP to the GPP regarding how fast/slow its decoding samples We're working on that. At the moment we don't have a accurate feedback from the decoding side. > Compensating using hacky techniques like modifying gettimeofday()... We completely agree. For the moment, however, this gives us a quick ability to get closer to matching rates. We are looking into where frame rates and bit rates on the sending side (the GPP) can be controlled. Once we do get better info from the DSP about how much data it's able to process we want to dynamically adjust the data rates to match. Thanks! -=- Mike Miller Rockwell Collins, Inc. Cedar Rapids, IA
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