Manually using Bluetooth
From Openmoko
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 |
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:
- Insert the module and power up bluetooth
root@fic-gta01:~$ modprobe gta01-pm-bt # module may be built-into recent kernels root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-bt.0/power_on
- 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. 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.
Hopefully FIC can provide more detail about what magic needs to happen so system audio uses the bluetooth SCO audio channel.
Further reading
http://www.holtmann.org/papers/bluetooth/ols2006_slides.pdf http://wiki.bluez.org/wiki/Audio#org.bluez.Audio