On Wed, 22 Oct 2008 11:32:35 +0530"ext Arun KS" <getarunks@xxxxxxxxx> wrote: > Hi Jarkko,> > I can get the audio playback working by applying this patch on> tlvaic23 and osk5912. But capture is having a lot of noise.> Thanks for testing! Very interesting, the DSP modes in aic23 and aic33 are not compatibleand my patch was tuned according to aic33. In aic23 the falling edge ofFS starts the transfer in DSP mode where in aic33 it's opposite. AIC23:"A falling edge on LRCIN or LRCOUT startsthe data transfer. The left-channel data consists of the first dataword, which is immediately followed by the right channel data word (seeFigure 3-8). Input word length is defined by the IWL register. Figure 3–8 shows LRP = 1 (default LRP = 0)." AIC33:"In DSP mode, the rising edge of the word clock starts the data transferwith the left channel data first and immediately followed by the rightchannel data. Each data bit is valid on the falling edge of the bitclock." Wolfson's spec for WM9713 made it much more clear. The DSP_A there isthe same format what AIC23 is using and DSP_B is almost what AIC33 isusing but bit clock polarity is different. http://www.wolfsonmicro.com/uploads/documents/en/WM9713.pdf I'll fix omap-mcbsp.c so that DSP_A is the format what AIC23 and WM9713are using and think later what to do with AIC33 and DSP_B :-) Jarkko_______________________________________________Alsa-devel mailing listAlsa-devel@xxxxxxxxxxxxxxxxxxxx://mailman.alsa-project.org/mailman/listinfo/alsa-devel
