OMAP1710 - Accessing audio codec from arm cpu

OMAP1710 - Accessing audio codec from arm cpu

[lbozzi]

Hi all,

I'm a newbie in omap architectures, so I beg your pardon If my question has an obvious answer.

I'd like to know if it's possible read/write audio samples in omap1710 (it's a Nokia N80) directly from arm cpu, "bypassing" C55xx DSP. I'm developing a custom application for such a device but cannot modify DSP code.

Thanks in advance for your replies,

Best Regards,

--Luciano BOZZI
Naviga e telefona senza limiti con Tiscali     
Scopri le promozioni Tiscali Adsl: navighi e telefoni senza canone Telecom
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Re: OMAP1710 - Accessing audio codec from arm cpu

[mirmit]

Are you talking about N80 or N800? N80 is not running Linux - out of the box
- and more likely doesn't expose API to talk with the DSP or control the
hardware. However, there is plenty of API to take advantage of the
multimedia peripheral of the device.

Maybe you can elaborate a bit.

Mirmit

2007/6/11, lbozzi@tiscali.it <lbozzi@tiscali.it>:
>
>
> Hi all,
>
> I'm a newbie in omap architectures, so I beg your pardon If my question
> has an obvious answer.
>
> I'd like to know if it's possible read/write audio samples in omap1710
> (it's a Nokia N80) directly from arm cpu, "bypassing" C55xx DSP. I'm
> developing a custom application for such a device but cannot modify DSP
> code.
>
> Thanks in advance for your replies,
>
> Best Regards,
>
> --Luciano BOZZI
> Naviga e telefona senza limiti con Tiscali
> Scopri le promozioni Tiscali Adsl: navighi e telefoni senza canone Telecom
> http://abbonati.tiscali.it/adsl/
> _______________________________________________
> Linux-omap-open-source mailing list
> Linux-omap-open-source@linux.omap.com
> http://linux.omap.com/mailman/listinfo/linux-omap-open-source
>

RE: OMAP1710 - Accessing audio codec from arm cpu

[Guruswamy, Senthilvadivu]

If you are able to bypass DSP, then write your own code to access DSP
Mcbsp in the armside to send the audio samples.  HW supports it.

-----Original Message-----
From: linux-omap-open-source-bounces@linux.omap.com
[mailto:linux-omap-open-source-bounces@linux.omap.com] On Behalf Of
lbozzi@tiscali.it
Sent: Monday, June 11, 2007 3:15 PM
To: linux-omap-open-source@linux.omap.com
Subject: OMAP1710 - Accessing audio codec from arm cpu


Hi all,

I'm a newbie in omap architectures, so I beg your pardon If my question
has an obvious answer.

I'd like to know if it's possible read/write audio samples in omap1710
(it's a Nokia N80) directly from arm cpu, "bypassing" C55xx DSP. I'm
developing a custom application for such a device but cannot modify DSP
code.

Thanks in advance for your replies,

Best Regards,

--Luciano BOZZI
Naviga e telefona senza limiti con Tiscali     
Scopri le promozioni Tiscali Adsl: navighi e telefoni senza canone
Telecom
http://abbonati.tiscali.it/adsl/
_______________________________________________
Linux-omap-open-source mailing list
Linux-omap-open-source@linux.omap.com
http://linux.omap.com/mailman/listinfo/linux-omap-open-source

Re: OMAP1710 - Accessing audio codec from arm cpu

[Cyrille Chartrain]

I do not know the N80, but if the DSP is used, then your audio codec is 
probably connected to the DSP via the McBSP1, which is in the DSP domain.
Accessing the audio samples via the ARM would be possible if McBSP2 is 
used instead of McBSP1 since McBSP2 is in the ARM domain.
So without a HW modification, I do not see a possibility here.

Regards,

Cyrille

Re: OMAP1710 - Accessing audio codec from arm cpu

[Cyrille Chartrain]

Cyrille Chartrain wrote:
> I do not know the N80, but if the DSP is used, then your audio codec 
> is probably connected to the DSP via the McBSP1, which is in the DSP 
> domain.
> Accessing the audio samples via the ARM would be possible if McBSP2 is 
> used instead of McBSP1 since McBSP2 is in the ARM domain.
> So without a HW modification, I do not see a possibility here.
>
> Regards,
>
> Cyrille
>
Correction: McBSP1 is accessible by the DSP but also by ARM according to 
the datasheet (this is not clearly written, but the McBSP registers
section gives the MPU address for McBSP1).
So if you manage to stop the DSP execution, you might have a solution.
Sorry for the first wrong answer.

Cyrille