On Fri, 2010-02-19 at 14:39 +0100, ext Jarkko Nikula wrote: > On Fri, 19 Feb 2010 10:34:32 +0200 > Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx> wrote: > > > I'm not sure, but you might need to configure the taps as well to have the > > correct sidetone. > > Also I have a recollection, that the McBSP sidetone requires DSP mode (TDM) in > > order to operate correctly, so on Beagle you might need to set up 4 channel > > mode. And how the channel mapping in 4 channel mode works in McBSP sidetone is > > another matter... > > > It seems to work with I2S too. > For both channels? I don't recall so.. and for the one channel only, the FIR doesn't behave expectedly? (maybe this works [1,0,..0], but more sophisticated ones may not..) > I think I forgot to enable control 'McBSP2 Sidetone' when I last time > tried this set (v1 or v2). But now my null test below works and I can > hear that the level is changing when I adjust the volumes with amixer. > > echo 32767 >/sys/devices/platform/omap-mcbsp.2/st_taps > > arecord -f dat >/dev/null |aplay -f dat /dev/zero > > amixer set -D hw:0 'McBSP2 Sidetone Channel 0' 32700 > amixer set -D hw:0 'McBSP2 Sidetone Channel 0' 327 > amixer set -D hw:0 'McBSP2 Sidetone Channel 0' -- -32700 > > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
