Re: Hi ALSA Team - serious technical question from Ron

Re: Hi ALSA Team - serious technical question from Ron

[Patrick Shirkey]

Hi Ronald,

I have forwarded this email the the alsa-devel mailing list.

Cheers.


Ronald Stewart wrote:
> Hello,
> I originally wrote this to the websmaster before I saw your email 
> addresses.
> I just want to let you guys know that I really believe that what I am
> inquiring about and trying to accomplish will really help Linux Audio
> across the board.
> If there is anyway I could get a conversation going with any of you
> about the state of ALSA in regards to my hardware (ie previous codec
> development)
> and share with you where we are at today along with preparing you with all
> the information you would need to succeed as well as where we are
> going with our vison.  Also I read what is required for HW / firmware
> but I think I can really excel in that category for the ALSA team and
> ready some dev boards for you or any other requirements that are
> needed.
> Any way, would love some feedback and hopefully you guys aren't too hard 
> on me.
> Thanks and here is the original email to webmaster:
> 
> Hey guys,
> 
> Can someone point me to the correct email address to ask this question?
> 
> I built a portable linux based multitrack studio/field recorder but we 
> have yet
> to get 24 bit audio sampling achieved on our prototypes.  Now we use a Soc
> utilizing the Intel PXA270 and we have disabled the ac97 codec on board and
> we are connecting the PXA to an AKM 4620A codec.  However, I was wondering
> how much development has occured for this if at all.
> Anyway I have many questions.  I decided over a year ago when I began that
> we would always be a Linux based product, for all the right reasons and now
> I could really use some help finishing this for producing the retail 
> versions.
> 
> Here is what it looks like!
> 
> Thanks and if anyone could assist me getting just a conversation going 
> about the
> current landscape I would really appreciate it.
> 
> Thank you
> 
> Ronald Stewart
> 
> ------------------------------------------------------------------------
> 


-- 
Patrick Shirkey - Boost Hardware Ltd.
Http://www.boosthardware.com
Http://lau.linuxaudio.org - The Linux Audio Users guide
========================================

"Anything your mind can see you can manifest physically, then it will 
become reality" - Macka B

Re: Hi ALSA Team - serious technical question from Ron

[Lee Revell]

On Sat, 2006-06-10 at 02:23 +0700, Patrick Shirkey wrote:
> > Can someone point me to the correct email address to ask this question?
> > 
> > I built a portable linux based multitrack studio/field recorder but we 
> > have yet
> > to get 24 bit audio sampling achieved on our prototypes.  Now we use a Soc
> > utilizing the Intel PXA270 and we have disabled the ac97 codec on board and
> > we are connecting the PXA to an AKM 4620A codec.  However, I was wondering
> > how much development has occured for this if at all.
> > Anyway I have many questions.  I decided over a year ago when I began that
> > we would always be a Linux based product, for all the right reasons and now
> > I could really use some help finishing this for producing the retail 
> > versions.
> > 

I guess you're using the existing alsa-kernel/arm/pxa2xx* code as a
starting point?

Can you post a link to your source code?

Lee

Re: Hi ALSA Team - serious technical question from Ron

[Liam Girdwood]

On Sat, 2006-06-10 at 02:23 +0700, Patrick Shirkey wrote:
> 
> Ronald Stewart wrote:

> > Hey guys,
> > 
> > Can someone point me to the correct email address to ask this question?
> > 
> > I built a portable linux based multitrack studio/field recorder but we 
> > have yet
> > to get 24 bit audio sampling achieved on our prototypes.  Now we use a Soc
> > utilizing the Intel PXA270 and we have disabled the ac97 codec on board and
> > we are connecting the PXA to an AKM 4620A codec.  However, I was wondering
> > how much development has occured for this if at all.
> > Anyway I have many questions.  I decided over a year ago when I began that
> > we would always be a Linux based product, for all the right reasons and now
> > I could really use some help finishing this for producing the retail 
> > versions.
> > 

You may be interested in an embedded ALSA project I'm working on:-

http://www.rpsys.net/openzaurus/patches/alsa/info.html

We currently have support for the SSP, I2S and AC97 interfaces on the
PXA2xx SoC. You will need to use the SSP interface for 24bit audio, as
the AC97 and I2S interfaces only support 16bit samples on the PXA27x.

We don't have your codec (AKM4620A) supported atm, but it's quite
trivial to add new codecs (there are lots of examples). With a few other
minor changes to the ssp driver (adding 24 bit support) you should be
able to start playing/capturing some audio.

Liam

Re: Hi ALSA Team - serious technical question from Ron

[Ronald Stewart]

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On 6/12/06, Liam Girdwood <liam.girdwood@wolfsonmicro.com> wrote:Oh yeah
this is AWESOME!!!
this is beautiful but lee mentioned it was available in the sources section,
how do I find alsa-kernel/arm/pxa2xx* and other sources?
I am so happy right nwo I cant standmyself!!!
thank you
ron
any links you can send me would be great!




On Sat, 2006-06-10 at 02:23 +0700, Patrick Shirkey wrote:
> >
> > Ronald Stewart wrote:
>
> > > Hey guys,
> > >
> > > Can someone point me to the correct email address to ask this
> question?
> > >
> > > I built a portable linux based multitrack studio/field recorder but we
> > > have yet
> > > to get 24 bit audio sampling achieved on our prototypes.  Now we use a
> Soc
> > > utilizing the Intel PXA270 and we have disabled the ac97 codec on
> board and
> > > we are connecting the PXA to an AKM 4620A codec.  However, I was
> wondering
> > > how much development has occured for this if at all.
> > > Anyway I have many questions.  I decided over a year ago when I began
> that
> > > we would always be a Linux based product, for all the right reasons
> and now
> > > I could really use some help finishing this for producing the retail
> > > versions.
> > >
>
> You may be interested in an embedded ALSA project I'm working on:-
>
> http://www.rpsys.net/openzaurus/patches/alsa/info.html
>
> We currently have support for the SSP, I2S and AC97 interfaces on the
> PXA2xx SoC. You will need to use the SSP interface for 24bit audio, as
> the AC97 and I2S interfaces only support 16bit samples on the PXA27x.
>
> We don't have your codec (AKM4620A) supported atm, but it's quite
> trivial to add new codecs (there are lots of examples). With a few other
> minor changes to the ssp driver (adding 24 bit support) you should be
> able to start playing/capturing some audio.
>
> Liam
>
>

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Re: Hi ALSA Team - serious technical question from Ron

[Liam Girdwood]

On Mon, 2006-06-12 at 09:23 -0700, Ronald Stewart wrote:
> 
> Oh yeah this is AWESOME!!! 
> this is beautiful but lee mentioned it was available in the sources
> section,
> how do I find alsa-kernel/arm/pxa2xx* and other sources?

You can find the original ALSA pxa2xx audio driver in your (recent) 2.6
kernel sources. Just look in linux/sound/arm/.

The ASoC patches can all be found here:-

http://www.rpsys.net/openzaurus/patches/alsa/

I have some clean up work todo before releasing ASoC 0.10 later this
week. I'll try and add 24 bit support to the ssp driver if I can get
some time, otherwise I'll put it into the 0.11 release.

Liam