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Max Inst (cycles) with Multirate project

Question asked by CyrilleD29 on Jan 15, 2018
Latest reply on Jan 16, 2018 by CyrilleD29


I have a question about a Multirate project running on ADAU1452 (see attached part).

Looking on Compiler Output, I have :

Compile succeeded : 0 errors, 0 warnings

Fs=192kHz - 67% (1029 cycles)

Fs=96kHz - 15% (904 cycles)

Fs=12kHz - 2% (405 cycles)

The sum gives 67+15+2=84%.

However, I discovered by measurements that dsp seems overloaded (incorrect frequency response).

Performing several tests, I discovered that dsp becomes overloaded at around 78% (addition of each percentage).

But some project seems OK at 78% and other not.

So I would like to know if there is a precise way to know the maximul available ressources in a Multirate project.



Best regards,