kw I²C - comp.os.plan9

I'm working on a audio driver for kw (openrd) as a warmup for other more useful drivers (do something easy before something hard), and I've come to the point where to do anything more requires talking to the audio codec. According to various linux patches, this is done over I²C. Has anyone done anything with I²C, is it used for anything else? The kirkwood functional specification does not mention it (at least so far as I can see in the copy I have). Elseways I'll scrounge around some more. Thoughts? tristan -- All original matter is hereby placed immediately under the public domain.

By I=B2C, you mean Immediate Command/Response Interface of HDAudio controll= er? Though Immediate Command/Response Interface should work, CORB/RIRB is the recommended way to send/receive commands/responses from the codec. If you do use Immediate mode, please refer to the updated HDAudio spec that clarifies use of ICB bit in ICIS register. http://www.intel.com/standards/hdaudio/pdf/hda002-a.pdf Thanks, Bankim. On Fri, Sep 3, 2010 at 4:08 PM, Tristan Plumb <9p-st@imu.li> wrote: > I'm working on a audio driver for kw (openrd) as a warmup for other more > useful drivers (do something easy before something hard), and I've come > to the point where to do anything more requires talking to the audio > codec. According to various linux patches, this is done over I=B2C. Has > anyone done anything with I=B2C, is it used for anything else? The kirkwo= od > functional specification does not mention it (at least so far as I can > see in the copy I have). Elseways I'll scrounge around some more. > > Thoughts? > > tristan > > -- > All original matter is hereby placed immediately under the public domain. > >

On Fri Sep 3 19:09:18 EDT 2010, 9p-st@imu.li wrote: > I'm working on a audio driver for kw (openrd) as a warmup for other more > useful drivers (do something easy before something hard), and I've come > to the point where to do anything more requires talking to the audio > codec. According to various linux patches, this is done over I²C. Has > anyone done anything with I²C, is it used for anything else? The kirkwood > functional specification does not mention it (at least so far as I can > see in the copy I have). Elseways I'll scrounge around some more. > if i read the marvell specification correctly, it uses i²s, not i²c. wikipedia has a pointer to the phillips specification. the main thing they have in common is that they both pass at least one of ron's "how to tell if a specification sucks" tests. :-) - erik

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