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Delay in input-/output ADSP-21489

Question asked by Thijs on Mar 4, 2016
Latest reply on Oct 14, 2016 by Jithul_Janardhanan

I'm using an ADSP-21489 EZ-KIT LITE for a project. I am running the DACs and ADC at 8kHz using PCGs and SRCs. I am using the I2S protocol.

 

As a test I sent a signal to the output port, ran a cable from the output port back to the input port and tried receiving the output signal again. When doing this I noticed there was a significant delay between sending the signal and receiving it again.

 

I added a plot of the output and input signals when I sent 1 period of a sine to the output port. There is a delay of around 12 ms (about 100 samples at 8kHz) between the output and input signal. This seems like a huge amount of time to me. What is the cause of this delay and is there any way I can reduce it?

 

I added my project to this post as well, so you can see if I'm making any stupid mistakes. I apologize if my code is sloppy and/or inefficient. I'm quite new to programming.

 

 

Thijs

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