Manually using Bluetooth
From Openmoko
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[[Neo1973_Audio_Subsystem]] has more detail about what magic needs to happen with the Wolfson codec so system audio can be switched to use the bluetooth audio channel and later back to the speaker/earpiece/wired headset. | [[Neo1973_Audio_Subsystem]] has more detail about what magic needs to happen with the Wolfson codec so system audio can be switched to use the bluetooth audio channel and later back to the speaker/earpiece/wired headset. | ||
+ | |||
+ | There seems to be a proposal for audio scenario management there but no detail about whether that is how things are done currently. How does audio management currently work when eg placing a call? | ||
== Further reading == | == Further reading == |
Revision as of 01:18, 24 May 2007
At the moment, we've just started to introduce Bluetooth into our Neo1973 Hardware.
We have quite a lot of plans about what exactly Bluetooth should be used for.
Contents |
Power it up
Bluetooth may not be powered up. The steps below work for most people but there are reports of P0 phones being stubborn about consistently powering up bluetooth.
Load the usb bluetooth driver:
root@fic-gta01:~$ modprobe hci_usb
Reset and power up the adapter
root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-bt.0/power_on root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-bt.0/power_on root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-bt.0/reset
Check to see if the adapter is up and running:
hciconfig
(If you have an older rootfs, you may need to modprobe gta01-pm-bt but it's built in currently.)
Bluetooth Functions
HID (Human Input Device)
Being able to use HID devices
We want to be able to use a bluetooth keyboard to type into the various applications of our Neo1973.
Acting as HID device
We want to be able to use the Neo1973 as a HID device, being able to use it as controller for presentations.
OBEX
Networking
Bluetooth should behave just like our usbnet and provide full TCP/IP access to the phone. BNEP has to be used.
On the laptop:
- Start bluetooth
elara /home/alphaone # /etc/init.d/bluetooth start
- Start pand as server
elara /home/alphaone # pand -s
- As soon as pand is started on the phone configure your IP address
elara /home/alphaone # ip a add 10.0.0.1/24 dev bnep0 elara /home/alphaone # ip l set bnep0 up
- Configure IP forwarding and masquerading to your liking
On the phone:
- Power on bluetooth (see above)
- Scan for the laptop
root@fic-gta01:~$ hcitool scan Scanning ... 00:0E:6D:C0:0l:6A Sho 00:20:E0:5A:FE:C8 BlueZ (0)
- Connect to the laptop pand
root@fic-gta01:~$ pand -c 00:20:E0:5A:FE:C8
- Configure your IP address
ip a add 10.0.0.2/24 dev bnep0 ip r add default via 10.0.0.1
- Enjoy
root@fic-gta01:~$ wget http://www-public.tu-bs.de:8080/~y0019680/tmp/thereisnophone.mp3 Connecting to www-public.tu-bs.de[134.169.9.108]:8080 thereisnophone.mp3 100****************************************************| 266 KB 00:00:00 ETA root@fic-gta01:~$ madplay thereisnophone.mp3 MPEG Audio Decoder 0.15.2 (beta) - Copyright (C) 2000-2004 Robert Leslie et al. 630 frames decoded (0:00:22.6), -0.9 dB peak amplitude, 0 clipped samples
A2DP
The A2DP codec, SBC, runs pretty well now in 32-bit fixed-point math. It's been successfully tested on a faster ARM but not yet on neo. There is test code in the bluetooth-alsa.sf.net plugz module for using alsa plugins to send A2DP audio out and it's starting to be reimplemented "properly" in the bluez core.
Headset Audio
Bluez has an audio daemon for headset audio that should work to set up the control connection to the headset. It will need hooks in the openmoko gui.
Neo1973_Audio_Subsystem has more detail about what magic needs to happen with the Wolfson codec so system audio can be switched to use the bluetooth audio channel and later back to the speaker/earpiece/wired headset.
There seems to be a proposal for audio scenario management there but no detail about whether that is how things are done currently. How does audio management currently work when eg placing a call?
Further reading
http://www.holtmann.org/papers/bluetooth/ols2006_slides.pdf http://wiki.bluez.org/wiki/Audio#org.bluez.Audio