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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.
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 hciconfig hci0 up bluetoothd
then use simple-agent from here: http://wiki.openmoko.org/wiki/Manually_using_Bluetooth#Pair to pair the device.
Test: "hcitool con" should say:
Connection ACL 00:13:17:78:7B:A3 handle 0 state 5 lm MASTER
Call to the phone and answer (or place a call, whichever is cheaper).
Wait till frameworkd sets its statefile and then overwrite it with your own:
alsamixer restore /path/to/the/statefile
(Find working statefile first)
Then due to kernel bug, do:
amixer sset "Capture Left Mixer" "Analogue Mix Right" amixer sset "Capture Left Mixer" "Analogue Mix Left"
Then issue dbus call (check what it is exactly) this starts exchanging audio between GSM and BT (hopefully):
org.bluez.Headset Play()
We would also need to set bluetooth IIS to 8000 rate:
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)
We should hear something in the BT headset and not in phone's speaker.