Dear Friends, I found the machine driver to be working after modification in setting up the proper clock divisor. Please find the working driver at http://pastebin.com/i5PrFxC7. Now, when I try to run the aplay utility, I got into following error: aplay: set_params:1172: not enough memory After debugging I found that the function snd_pcm_hw_params_get_period_size(params, &chunk_size, 0); call under set_params() function returns the value of chunk_size to zero. Thus realloc fails and returns the above error. I came across following link http://mailman.alsa-project.org/pipermail/alsa-devel/2009-February/014976.html who faced the same problem. Can any one suggest some light on why it is happening? I am using alsa-lib & alsa-utils version 1.0.23 on AT91SAM9 processor using buildroot. Have a Good Day, Thank you, Ankur. On Tue, Aug 16, 2011 at 12:19 PM, Ankur Patel <connintel@xxxxxxxxx> wrote: > Dear Friends, > > I am using WM8727 codec with AT91SAM9G45 processor. I have implemented > machine code as http://pastebin.com/axadqGhd . I found over the web > that the SSC driver from Atmel and WM8727 Codec driver works fine as > couple of ppl have used it successfully. I guess the issue should be > in the machine driver. > > After insterting the module I got following output: > # insmod sam9g45_wm8727.ko > atmel-pcm:preallocate_dma_buffer: area=ffadf000, addr=77c40000, size=32768 > asoc: WM8727 <-> atmel-ssc0 mapping ok > > I am getting error while running "cat /dev/urandom > /dev/audio" and found > following output : > # cat /dev/urandom > /dev/audio > atmel_ssc_startup: SSC_SR=0x204 > atmel_ssc_hw_params: RCMR=00010721 RFMR=0000008f TCMR=00010702 TFMR=0000008f > atmel_ssc_dai: Starting clock > atmel_ssc_dai,hw_params: SSC initialized > atmel-pcm: hw_params: DMA for SSC0 PCM out initialized > (dma_bytes=32768, period_size=8192) > transmit enabled SSC_SR=0x000104cf > atmel-pcm:buffer_size = 8192,dma_area = ffac1000, dma_bytes = 32768 > atmel-pcm: trigger: period_ptr=77962000, xpr=2006319104, xcr=4096, > xnpr=2006327296, xncr=4096 > sr=65731 imr=0 > ALSA sound/core/pcm_lib.c:1708: playback write error (DMA or IRQ trouble?) > ALSA sound/core/pcm_lib.c:1708: playback write error (DMA or IRQ trouble?) > cat: write error: Input/output error > ALSA sound/core/pcm_native.c:1482: playback drain error (DMA or IRQ trouble?) > atmel-pcm:buffer_size = 8192,dma_area = ffac1000, dma_bytes = 32768 > atmel_ssc_shutdown: transmit disabled SSC_SR=0x000000c0 > atmel_ssc_dau: Stopping clock > > Any suggestions/thoughts will be helpful. > > Note: I have posted the question alsa-devel but later on I found that > it is for the enhancement for the drivers so I am posting it on the > alsa-user mailing list. > > Have a Good Day, > Thank you, > Ankur. > ------------------------------------------------------------------------------ Get a FREE DOWNLOAD! and learn more about uberSVN rich system, user administration capabilities and model configuration. Take the hassle out of deploying and managing Subversion and the tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
