From: lokowich <lokowich@acdstar.com>
To: ALSA-devel <alsa-devel@alsa-project.org>
Subject: MPC5200 I2S driver for ASoC
Date: Wed, 01 Aug 2007 12:33:34 -0500 [thread overview]
Message-ID: <46B0C3EE.5020401@acdstar.com> (raw)
I'm integrating a ALSA driver for an MPC5200 into the ASoC layer,
similar to my successful effort for a PXA255 board. I'm modeling the
DMA and ALSA interfaces per ac97mgt driver found in the Lite5200B BSP,
rather than the BestComm API example in the 2.4 kernel. The
speaker-test with 400Hz sine wave is working, but has a slight audible
jitter. A wav file output using aplay produces white noise. Debugging
shows I get two requests for buffer pointer per service of my transmit
ISR (after the single call to snd_pcm_period_elapsed). I expect only
one pointer request per interrupt. Could this be the noise problem?
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next reply other threads:[~2007-08-01 17:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-01 17:33 lokowich [this message]
2007-08-01 17:53 ` MPC5200 I2S driver for ASoC Timur Tabi
2007-08-01 19:16 ` lokowich
2007-08-01 19:45 ` Timur Tabi
2007-08-01 19:41 ` Jon Smirl
2007-08-01 21:03 ` lokowich
2007-08-01 21:20 ` Timur Tabi
2007-08-05 0:11 ` Jon Smirl
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