[Bluez-users] SCO mapping, bccmd mapsco

[Bluez-users] SCO mapping, bccmd mapsco

[Marcus C. Gottwald]

Hello everyone!

I thought I'd give using my bluetooth headset as microphone and
speaker a try, using bluetooth-alsa. Everything is working
(pairing, connecting, getting key press info) apart from no
sound data being sent to or received from the headset, both with
a Nokia headset (HS-3W) and a Motorola one (H300).

One hint I found was to look at "hciconfig hci0 revision" to
check for the "SCO mapping". So I did:

  coach:~# hciconfig hci0 revision
  hci0:   Type: USB
          BD Address: 08:00:46:EB:0E:B6 ACL MTU: 192:8 SCO MTU: 64:8
          HCI 18.1
          Chip version: BlueCore02-External
          Max key size: 56 bit
          SCO mapping:  PCM

And supposedly the mapping to PCM is not what I want. Also, the
counters for "sco" in the hciconfig output never showed anything
but 0. So I got myself the bluez-utils sources, compiled them to
get "bccmd" and gave it a try:

  coach:~# bccmd psset mapsco 0
  coach:~# hciconfig hci0 revision
  hci0:   Type: USB
          BD Address: 08:00:46:EB:0E:B6 ACL MTU: 192:8 SCO MTU: 64:8
          HCI 18.1
          Chip version: BlueCore02-External
          Max key size: 56 bit
          SCO mapping:  HCI

Looking good, but nothing actually changed. Looking closer I
noticed:

  coach:~# bccmd psset mapsco 0
  coach:~# bccmd psget mapsco
  Map SCO over PCM: 0x0001 (1)
  coach:~# bccmd psset mapsco 1
  coach:~# bccmd psget mapsco
  Map SCO over PCM: 0x0001 (1)

However, the output of "hciconfig" changes from "PCM" to "HCI"
back and forth as expected. So question 1 would be: Is it normal
for the output of "hciconfig" to change although "psget" returns
an unchanged value?

Since the Bluetooth device is connected internally via USB, I
thought maybe I should try "bccmd" with "-t USB", but I only get
a "Device not available". Looking at "csr_open_usb()" I presume
the "device" argument isn't actually used. So I changed the code
to look for device 044e:3007 instead of 0a12:0001 since my
Bluetooth device identifies as such, but then only receive the
output of "Can't claim interface: Device or resource busy (16)"
even with all other Bluetooth stuff (rfcomm, sdpf, hcid) not
running.

So question 2 would be: What's the correct way to access the
device via USB (if trying to do so actually makes any sense at
all)?


Thanks in advance,

Marcus

-- =

   Marcus C. Gottwald  =B7  http://www.inf.fu-berlin.de/~gottwald/



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Re: [Bluez-users] SCO mapping, bccmd mapsco

[Marcel Holtmann]

Hi Marcus,

> I thought I'd give using my bluetooth headset as microphone and
> speaker a try, using bluetooth-alsa. Everything is working
> (pairing, connecting, getting key press info) apart from no
> sound data being sent to or received from the headset, both with
> a Nokia headset (HS-3W) and a Motorola one (H300).
> 
> One hint I found was to look at "hciconfig hci0 revision" to
> check for the "SCO mapping". So I did:
> 
>   coach:~# hciconfig hci0 revision
>   hci0:   Type: USB
>           BD Address: 08:00:46:EB:0E:B6 ACL MTU: 192:8 SCO MTU: 64:8
>           HCI 18.1
>           Chip version: BlueCore02-External
>           Max key size: 56 bit
>           SCO mapping:  PCM
> 
> And supposedly the mapping to PCM is not what I want. Also, the
> counters for "sco" in the hciconfig output never showed anything
> but 0. So I got myself the bluez-utils sources, compiled them to
> get "bccmd" and gave it a try:
> 
>   coach:~# bccmd psset mapsco 0
>   coach:~# hciconfig hci0 revision
>   hci0:   Type: USB
>           BD Address: 08:00:46:EB:0E:B6 ACL MTU: 192:8 SCO MTU: 64:8
>           HCI 18.1
>           Chip version: BlueCore02-External
>           Max key size: 56 bit
>           SCO mapping:  HCI
> 
> Looking good, but nothing actually changed. Looking closer I
> noticed:
> 
>   coach:~# bccmd psset mapsco 0
>   coach:~# bccmd psget mapsco
>   Map SCO over PCM: 0x0001 (1)
>   coach:~# bccmd psset mapsco 1
>   coach:~# bccmd psget mapsco
>   Map SCO over PCM: 0x0001 (1)

use "bccmd psset --stores psf mapsco 0".

Regards

Marcel




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Re: [Bluez-users] SCO mapping, bccmd mapsco

[Marcus C. Gottwald]

Hello,

Marcel wrote (Fri 2006-Jul-14 18:22:55 +0200):

> >   coach:~# bccmd psset mapsco 0
> >   coach:~# bccmd psget mapsco
> >   Map SCO over PCM: 0x0001 (1)
> >   coach:~# bccmd psset mapsco 1
> >   coach:~# bccmd psget mapsco
> >   Map SCO over PCM: 0x0001 (1)
> =

> use "bccmd psset --stores psf mapsco 0".

Wow, that was quick. But using "--stores psf" doesn't seem to
help; and even the hciconfig output remains unchanged:

  coach:~# hciconfig hci0 revision
  hci0:   Type: USB
          BD Address: 08:00:46:EB:0E:B6 ACL MTU: 192:8 SCO MTU: 64:8
          HCI 18.1
          Chip version: BlueCore02-External
          Max key size: 56 bit
          SCO mapping:  PCM
  coach:~# bccmd psset --stores psf mapsco 0
  coach:~# bccmd psget mapsco
  Map SCO over PCM: 0x0001 (1)
  coach:~# hciconfig hci0 revision
  hci0:   Type: USB
          BD Address: 08:00:46:EB:0E:B6 ACL MTU: 192:8 SCO MTU: 64:8
          HCI 18.1
          Chip version: BlueCore02-External
          Max key size: 56 bit
          SCO mapping:  PCM

I'll be happy to try anything else. :-)


Cheers, Marcus

-- =

   Marcus C. Gottwald  =B7  http://www.inf.fu-berlin.de/~gottwald/



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Re: [Bluez-users] SCO mapping, bccmd mapsco

[Marcel Holtmann]

Hi Marcus,

> > >   coach:~# bccmd psset mapsco 0
> > >   coach:~# bccmd psget mapsco
> > >   Map SCO over PCM: 0x0001 (1)
> > >   coach:~# bccmd psset mapsco 1
> > >   coach:~# bccmd psget mapsco
> > >   Map SCO over PCM: 0x0001 (1)
> > 
> > use "bccmd psset --stores psf mapsco 0".
> 
> Wow, that was quick. But using "--stores psf" doesn't seem to
> help; and even the hciconfig output remains unchanged:
> 
>   coach:~# hciconfig hci0 revision
>   hci0:   Type: USB
>           BD Address: 08:00:46:EB:0E:B6 ACL MTU: 192:8 SCO MTU: 64:8
>           HCI 18.1
>           Chip version: BlueCore02-External
>           Max key size: 56 bit
>           SCO mapping:  PCM
>   coach:~# bccmd psset --stores psf mapsco 0
>   coach:~# bccmd psget mapsco
>   Map SCO over PCM: 0x0001 (1)
>   coach:~# hciconfig hci0 revision
>   hci0:   Type: USB
>           BD Address: 08:00:46:EB:0E:B6 ACL MTU: 192:8 SCO MTU: 64:8
>           HCI 18.1
>           Chip version: BlueCore02-External
>           Max key size: 56 bit
>           SCO mapping:  PCM
> 
> I'll be happy to try anything else. :-)

try "bccmd psset --stores psi mapsco 0". If this still doesn't work then
replace "psi" with "0".

Regards

Marcel



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Re: [Bluez-users] SCO mapping, bccmd mapsco

[Marcus C. Gottwald]

Hello Marcel,

Marcel Holtmann wrote (Tue 2006-Jul-18 13:01:31 +0200):

> > > use "bccmd psset --stores psf mapsco 0".
> > =

> > Wow, that was quick. But using "--stores psf" doesn't seem to
> > help; and even the hciconfig output remains unchanged:
..
> try "bccmd psset --stores psi mapsco 0". If this still doesn't work then
> replace "psi" with "0".

Good news is: It works!

Bad news is: I don't really know why. A simple "psget mapsco"
currently doesn't work anymore, though after issuing a "psset
mapsco" the output of "hciconfig hci0 revision" keeps changing
as exepcted and as it always did.

While testing with "--stores" I realized that having "btsco"
running and/or having "snd-bt-sco" loaded might make a
difference, so I currently can't tell what exactly made it work
while I was playing around. If I ever find out for sure, I'll
post it. :-)

I now have my notebook computer with builtin Bluetooth adapter
(internally connected via USB, switched on and off by software)
online via a Bluetooth connection to my UMTS mobile and talking
to a Bluetooth headset at the same time.


Thanks again!

Marcus

-- =

   Marcus C. Gottwald  =B7  http://www.inf.fu-berlin.de/~gottwald/


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