Search found 6 matches

by pdeoliveira
Sat Jun 08, 2013 12:15 pm
Forum: Other XMOS Development Kits
Topic: USB Audio 2.0 MC and 24x192K file
Replies: 3
Views: 3015

Re: USB Audio 2.0 MC and 24x192K file

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.
by pdeoliveira
Sat Jun 08, 2013 9:41 am
Forum: Other XMOS Development Kits
Topic: USB Audio 2.0 MC and 24x192K file
Replies: 3
Views: 3015

Re: USB Audio 2.0 MC and 24x192K file

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 ...
by pdeoliveira
Fri Jun 07, 2013 10:04 am
Forum: Other XMOS Development Kits
Topic: USB Audio 2.0 MC and 24x192K file
Replies: 3
Views: 3015

USB Audio 2.0 MC and 24x192K file

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 pdeoliveira
Sun Apr 29, 2012 10:38 am
Forum: Other XMOS Development Kits
Topic: USB Audio 2.0 MC Reference Design and Linux (Ubuntu)
Replies: 13
Views: 19437

Re: USB Audio 2.0 MC Reference Design and Linux (Ubuntu)

Some news ... I confirm that the current version of the ALSA driver doesn't support the UAC2_EXTENSION_UNIT_V2 value for interface descriptor. What I've done : 1/ I use the standard XMOS firmware 2/. I updated the alsa source (simple modification of mixer.c) and recompiled it. Now, I get some warnin...
by pdeoliveira
Fri Apr 20, 2012 5:08 pm
Forum: Other XMOS Development Kits
Topic: USB Audio 2.0 MC Reference Design and Linux (Ubuntu)
Replies: 13
Views: 19437

Re: USB Audio 2.0 MC Reference Design and Linux (Ubuntu)

Thank you for your help, Ross. I've tried your fix but I still get the error. So I put back the old value ("8"). Looking into the code, I've found the subtype 9 (extension unit) is used for the mixer. So I "undef" MIXER in customdefines.h and now, it works (still get some warning...
by pdeoliveira
Thu Apr 19, 2012 4:59 pm
Forum: Other XMOS Development Kits
Topic: USB Audio 2.0 MC Reference Design and Linux (Ubuntu)
Replies: 13
Views: 19437

USB Audio 2.0 MC Reference Design and Linux (Ubuntu)

Hello, I've a problem trying to run an USB Audio 2.0 MC Reference Design with Linux (Ubuntu 11.10). When I connected it to the computer I've got the following error in dmesg : [ 112.313730] usbaudio: unit 51: unexpected type 0x09 [ 112.313775] snd-usb-audio: probe of 1-5:1.0 failed with error -5 [ 1...