Thanks Peter, Your comment helped. > -----Original Message----- > From: Peter Ujfalusi [mailto:peter.ujfalusi@xxxxxxxxx] > Sent: Friday, January 21, 2011 1:27 PM > To: Koyamangalath, Abhilash > Cc: linux-omap@xxxxxxxxxxxxxxx; alsa-devel@xxxxxxxxxxxxxxx > Subject: Re: [QUERY] [AUDIO][OMAP3 EVM] arecord not working on OMAP3 EVM > > On 01/20/11 17:26, ext Koyamangalath, Abhilash wrote: > > Hi all > > While testing audio capture (using arecord e,g.),I'm getting only noise > in the (zeroed out) output buffers on the OMAP3 EVM. > > I have enabled AUXL and AUXR mic inputs through alsamixer, which > according to the schematics are connected to the "Audio In" > > connector on the board, even though the TWL4030 reg list does not allow > me any ways ( or so I think) to specify mic-bias for > > these aux inputs. > > Well, it is auxiliary input (line in). You do not need bias for it. > I do not have access to OMAP3 EVM documentation, but Beagle also have > AUXL/R as input. > I guess you need to use correct cable, and correct source for the input > (stereo jack I suppose). No need of bias precludes using a MIC, so I tried by connecting a Line-in/out audio cable (a cable with a 3.5 mm audio jack on each end) fed from the PC and it worked, thanks. Originally, I had connected a head-phone mic directly to the audio-in port, which it seems, rather expects a dc-biased and/or a pre-amplified signal. > > > With AUXL and AUXR muted - I get only silence, which seems to make > sense. > > Is there any basic startup setting I'm missing, maybe specific to OMAP3 > EVM? > > Beagle? > > > Has anyone seen anything like this before, and could provide pointers? > > My bet goes for the wrong cable/accessory pair. Bang On. > > -- > Péter -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
