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

[Marcel Holtmann <marcel@holtmann.org>]

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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