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ADAU1777 problem with more than 16 instructions

Question asked by msmithers on May 15, 2018

Hi,

 

I have a simple setup where Input 2 feeds 7 "General (2nd order)" filters and sends out OUT0. Similarly Input 3 feeds 7 "General (2nd order)" filters and sends out OUT1. The compiler says the instruction count is 16 out of 32.

 

When I add any additional blocks - which result in an instruction count of 17 or more - audio stops playing out of one of OUT0 or OUT1. Usually OUT1 goes silent.

 

Is this supposed to happen? Basically I can't use the DSP up to it's maximum 32 instructions.

 

I've tested all sample rates from 48 kHz up to 768 kHz and the problem is always there.

 

Thanks,

Michael

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