[Bluez-users] SCO route way!!

[Bluez-users] SCO route way!!

[Chen Bin]

Hi all, 

I am developing Bluetooth on Smart Phone, I have a question about
bluetooth voice, I don't know whether it is suitable to ask this
question here. 

My chip is TI BRF6100, I can change data between my board and the BT usb
dongle, and it can connect to the bluetooth headset, but it can't play
any music to it. 

The rfcomm connection has been connected and I can receive the AT
command from the headset.Using hcidump, I found that the SCO link is
added, but then there is no SCO traffic in the channel. 

The chip can support SCO data route from hci or direct to the baseband
from codec. I think the default choice of the chip is baseband. 

How can I choose the SCO route method? Is it a standard HCI command or
vendor-specific command? 

Any help appreciated! 

Chen



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Re: [Bluez-users] SCO route way!!

[Marcel Holtmann]

Hi Chen,

> I am developing Bluetooth on Smart Phone, I have a question about
> bluetooth voice, I don't know whether it is suitable to ask this
> question here. 

yes, this is the wrong mailing list until you start using Linux and
BlueZ on your smart phone ;)

> My chip is TI BRF6100, I can change data between my board and the BT usb
> dongle, and it can connect to the bluetooth headset, but it can't play
> any music to it. 
> 
> The rfcomm connection has been connected and I can receive the AT
> command from the headset.Using hcidump, I found that the SCO link is
> added, but then there is no SCO traffic in the channel. 
> 
> The chip can support SCO data route from hci or direct to the baseband
> from codec. I think the default choice of the chip is baseband. 
> 
> How can I choose the SCO route method? Is it a standard HCI command or
> vendor-specific command? 

There are two ways, SCO over HCI and SCO over PCM. There is no standard
HCI command to switch between them. They are all vendor specific or
preset by the chip manufacturer and not changeable.

Regards

Marcel




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Re: [Bluez-users] SCO route way!!

[Chen Bin]

Hi Holtmann,

Thanks for your kind answer. I have another question. 

If the SCO is over PCM, what should I do before I write data from the
codec to the chip, just establish the connection is enough?

I mean, I use HCI ACL to add a SCO link with the chip, then I write the
voice data from the codec to the chip. I wonder if there are several SCO
connections over the chip, how can the chip determine which connection
will be used to send the voice? Should I do more steps to specify which
connection to use?

Thanks in advance.

Chen
在2004年09月28日的16:14，Marcel Holtmann写道：
> Hi Chen,
> 
> > I am developing Bluetooth on Smart Phone, I have a question about
> > bluetooth voice, I don't know whether it is suitable to ask this
> > question here. 
> 
> yes, this is the wrong mailing list until you start using Linux and
> BlueZ on your smart phone ;)
> 
> > My chip is TI BRF6100, I can change data between my board and the BT usb
> > dongle, and it can connect to the bluetooth headset, but it can't play
> > any music to it. 
> > 
> > The rfcomm connection has been connected and I can receive the AT
> > command from the headset.Using hcidump, I found that the SCO link is
> > added, but then there is no SCO traffic in the channel. 
> > 
> > The chip can support SCO data route from hci or direct to the baseband
> > from codec. I think the default choice of the chip is baseband. 
> > 
> > How can I choose the SCO route method? Is it a standard HCI command or
> > vendor-specific command? 
> 
> There are two ways, SCO over HCI and SCO over PCM. There is no standard
> HCI command to switch between them. They are all vendor specific or
> preset by the chip manufacturer and not changeable.
> 
> Regards
> 
> Marcel
> 
> 

Re: [Bluez-users] SCO route way!!

[Marcel Holtmann]

Hi Chen,

> If the SCO is over PCM, what should I do before I write data from the
> codec to the chip, just establish the connection is enough?

in general, yes.

> I mean, I use HCI ACL to add a SCO link with the chip, then I write the
> voice data from the codec to the chip. I wonder if there are several SCO
> connections over the chip, how can the chip determine which connection
> will be used to send the voice? Should I do more steps to specify which
> connection to use?

This depends on your chip manufacturer. Ask them.

Regards

Marcel




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