USB Audio 2.0 MC and 24x192K file

[pdeoliveira]

Hello,
I've tried to play high definition (24x192KHz) files (both music and test files) on my USB Audio 2.0 MC Reference Design board and the sound was very distorted. The test was conducted on Linux and Windows and the results were the same. The distorsion disappeared when the volume was decreased by software (but not bit-perfect anymore).
The firmware was generated from the recommendations described in section 3.20.2.3 of the "USB Audio Design Guide" ("Configuration 3").
Did anyone try to play such files and how do they manage to get it work ?

Thanks in advance for your help,
Pascal

[Ross]

What tools versions and software versions are you using please?

Sounds like you have a shift on the I2S data lines..

Optimisations are set to -O3?

[pdeoliveira]

Thanks for your answer, Ross.
I'm using dev tools 11.11.0, both Windows and Linux and both IDE and command line, with the same results. All the compilations are done with standard settings. I'll try to "play" with the optimisation and other settings and see (or hear) the results ...

[pdeoliveira]

I've tried -O1/2/3 (in the makefile, the default is 3), without any changes. The -O0 created compilation errors that I need to investigate.