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. ------------------------------------------------------------------------------ uberSVN's rich system and user administration capabilities and model configuration take the hassle out of deploying and managing Subversion and the tools developers use with it. Learn more about uberSVN and get a free download at: http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
