On Thursday 22 May 2008 06:11:31 pm Geoffrey Wossum wrote: > On Thursday 22 May 2008 05:48:41 pm Mark Brown wrote: > > On Thu, May 22, 2008 at 02:57:41PM -0500, Geoffrey Wossum wrote: > > > Looks like it should work to me. Note that I do hear a pop from the > > > speaker the first time I try to play a file. Here's a dump of the > > > registers while I'm trying to play a file with aplay. I'm combing > > > through them right now to see if I can find anything that looks off. > > > > I'll have a look at it at some point, but not right now :) . I should > > also have asked you if you could post your machine driver - if you'd > > rather post it off-list that'd be fine. Ok, I got it working. It can now play "I'm sorry, Dave. I'm afraid I can't do that." This should be the audio equivalent of "Hello world" :) First, I changed it so the AVR32 provided the BCLK and FRAME. I could never get the WM8510 to generate what looked like proper FRAMES. I did continue using the WM8510's PLL to generate the DAC clock. With the AVR32 providing the clocks, I at least got some noise out of it. After a lot of head scratching and analyzing register settings and what not, I realized that I had based my AVR32 platform drivers on the AT91. The AT91 is little endian, the AVR32 is big endian. Changing all the SNDRV_PCM_FMTBIT_ settings to be BE instead of LE changed the noise into the files I was trying to play. Finally, I really had to lie in the wm8510 code and say that it supported a minimum of 2 channels, and a maximum of 2 channels. This makes sense from the data sheet, since it still wants a left and a right channel of data, and just throws one away. A few questions: I had to change the WM8510's format to say that it wanted big endian. Should the CODEC (and platform and machine) be setup just to say that it uses SNDRV_PCM_FMTBIT_S16 instead of SNDRV_PCM_FMTBIT_S16_LE/BE? Looks from sound/pcm.h this should just do the Right Thing. Any idea why I couldn't get the WM8510 to generate the FRAME signal properly? Like I said before, it generated a 44.1 kHz frame no matter the BCLK divider or the word length were set to. Thanks for the help! As soon as I get the code cleaned up some, I'll contribute the AVR32 platform driver code. --- Geoffrey _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
