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Testing GSM <-> BT

Basics: We need to tell audio codec to route sound from GSM chip to BT chip. Codec is controlled by ALSA and mixer settings.

Prerequisites: BT device must be paired before the operation.

Step one: powering on bluetooth, setting up bluetoothd, pairing

Set /etc/bluetooth/audio.conf like this:

# SCO routing. Either PCM or HCI (in which case audio is routed to/from ALSA)   
# Defaults to HCI                                                               
SCORouting=PCM                                                                  

Then

echo 1 > /sys/bus/platform/devices/neo1973-pm-bt.0/power_on
sleep 1
hciconfig hci0 up
bluetoothd

then use simple-agent from here: http://wiki.openmoko.org/wiki/Manually_using_Bluetooth#Pair to pair the device.

Connect to the headset:

BTADAPTER=`dbus-send --system --dest=org.bluez --print-reply / org.bluez.Manager.DefaultAdapter | tail -1 | sed 's/^.*"\(.*\)".*$/\1/'`
dbus-send --system --dest=org.bluez --print-reply $BTADAPTER/dev_00_13_17_78_7B_A3 org.bluez.Headset.Connect

Test: "hcitool con" should say:

Connection
     ACL 00:13:17:78:7B:A3 handle 0 state 5 lm MASTER

Test2:

BTADAPTER=`dbus-send --system --dest=org.bluez --print-reply / org.bluez.Manager.DefaultAdapter | tail -1 | sed 's/^.*"\(.*\)".*$/\1/'`
dbus-send --system --dest=org.bluez --print-reply $BTADAPTER/dev_00_13_17_78_7B_A3 org.bluez.Headset.Connect

should say: Error org.bluez.Error.AlreadyConnected: Already Connected

More debug

root@om-gta02 /usr/lib/python2.6/site-packages $ dbus-send --system --dest=org.bluez --print-reply $BTADAPTER/dev_00_13_17_78_7B_A3 org.bluez.Headset.Disconnect
method return sender=:1.18 -> dest=:1.287 reply_serial=2

root@om-gta02 /usr/lib/python2.6/site-packages $ dbus-send --system --dest=org.bluez --print-reply $BTADAPTER/dev_00_13_17_78_7B_A3 org.bluez.Headset.Connect
Error org.bluez.Error.ConnectionAttemptFailed: Input/output error

root@om-gta02 /usr/lib/python2.6/site-packages $ dbus-send --system --dest=org.bluez --print-reply $BTADAPTER/dev_00_13_17_78_7B_A3 org.bluez.Headset.Connect
method return sender=:1.18 -> dest=:1.290 reply_serial=2

root@om-gta02 /usr/lib/python2.6/site-packages $ dbus-send --system --dest=org.bluez --print-reply $BTADAPTER/dev_00_13_17_78_7B_A3 org.bluez.Headset.Play   
method return sender=:1.18 -> dest=:1.292 reply_serial=2

Step two: make a call

Call to the phone and answer (or place a call, whichever is cheaper).

Step three: load ALSA settings to switch codec "mode" to GSM <=> BT

Wait till frameworkd sets its statefile and then overwrite it with your own:

alsactl restore < /usr/share/shr/scenarii/gsmbluetooth.state
amixer sset "Capture Left Mixer" "Analogue Mix Right"
amixer sset "Capture Left Mixer" "Analogue Mix Left"

(last two lines due to kernel bug).

Set bluetooth IIS to 8000 rate:

python set_pcm.py

Where the set_pcm.py is:

import alsaaudio

pcm_play = alsaaudio.PCM( alsaaudio.PCM_PLAYBACK, alsaaudio.PCM_NONBLOCK, "hw:0,1" )
pcm_play.setchannels(1)
pcm_play.setrate(8000)
pcm_play.setformat(alsaaudio.PCM_FORMAT_S16_LE)
pcm_play.setperiodsize(500000)

pcm_cap = alsaaudio.PCM( alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NONBLOCK, "hw:0,1" )
pcm_cap.setchannels(1)
pcm_cap.setrate(8000)
pcm_cap.setformat(alsaaudio.PCM_FORMAT_S16_LE)
pcm_cap.setperiodsize(500000)

Then issue dbus call to start exchanging audio between GSM and BT:

BTADAPTER=`dbus-send --system --dest=org.bluez --print-reply / org.bluez.Manager.DefaultAdapter | tail -1 | sed 's/^.*"\(.*\)".*$/\1/'`
dbus-send --system --dest=org.bluez --print-reply $BTADAPTER/dev_00_13_17_78_7B_A3 org.bluez.Headset.Play

We should hear something in the BT headset and not in phone's speaker.

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