Am 11.11.2010 13:27, schrieb Alan Horstmann: > On Wednesday 10 November 2010 22:49, Ryan Mallon wrote: > >> I'm working on a custom board using the AT91SAM9G45 processor and a >> TLV320AIC26 SPI attached audio codec using I2S format audio. When doing >> audio playback on the board the left and right channels are occasionally >> flipped. >> > <snip> > > >> Has anybody else had this problem, or does anybody have any AT91/Atmel >> hardware that they could test to see if it occurs on other hardware also? >> > I have worked with the AT91SAM9260 on a project which is currently suspended > (other priorities), where we had a simiar problem, with a codec on SPI. > Every time audio was started (capture or playback) the channels could be > swapped. Solving that issue remains TODO when we restart. > > There was a thread on alsa-devel last month 'Soc Atmel SSC stereo problem' > with some suggestions. > > In the thread mentioned, Alan proposed me amongst other things to test the LRCK level before starting the SSC. This works well for me. Maybe it should be implemented in a more generic way but the following modification does the trick for me. in function atmel_pcm_trigger inside file sound/soc/atmel/atmel-pcm.c : case SNDRV_PCM_TRIGGER_START: +while(!at91_get_gpio_value(AT91_PIN_PB12)); +while(at91_get_gpio_value(AT91_PIN_PB12)); case SNDRV_PCM_TRIGGER_RESUME: +while(!at91_get_gpio_value(AT91_PIN_PB12)); +while(at91_get_gpio_value(AT91_PIN_PB12)); Patrick -- Dipl.-Inf. (FH) Patrick Ziegler University Of Applied Sciences Kaiserslautern Amerikastrasse 1 D-66482 Zweibruecken Germany Phone: +49 631 3724 5526 Mail: patrick.ziegler@xxxxxxxx http://www.fh-kl.de http://www.fh-kl.de/fachbereiche/imst/iuk-knowhow.html _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
