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ADAU1445 FIR filter MIPS calculation

Question asked by RPWG on Mar 17, 2016
Latest reply on Mar 17, 2016 by DaveThib

Hi,

 

We are using the ADAU1445 for FIR processing. Recently we have updated Sigma Studio (now using 3.11 Build 2, Rev. 1396) and noticed the following entry in the compiler output:

 

Obsolete algorithm code encountered in this project:

http://wiki.analog.com/resources/tools-software/sigmastudio/usingsigmastudio/buildingschematics/obsoletealgorithms

 

1. Cell: <NAME>, Algorithm: FIR

2. Cell: <NAME>, Algorithm: FIR

 

Now that I have replaced those two FIR filters with the new algorithms, their MIPS count drops to '19', changing the number of taps has no impact on the MIPS calculation. I would expect the number of MIPS/instructions executed to be the actual number of taps if there is no hardware acceleration. I suspect there is a bug in the compiler output for the ADAU1445 using the updated FIR algorithm?

 

Best regards,

Roman

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