Connection

Snapper 9260 QSK Bluetooth module wiring

Configuration

echo set > /proc/gpio/GPIOB21
echo clear > /proc/gpio/GPIOB26
echo in > /proc/gpio/GPIOB27
hciattach /dev/ttyS1 csr 115200 noflow

If, as in our example, the Bluetooth module does not come up with a valid MAC address, just take it down and up again:

hciconfig hci0 down
hciconfig hci0 up

This appears to be a bug in the Linux HCI system: http://linuxgazette.net/109/oregan3.html

Example

root@snapper:~$ echo set > /proc/gpio/GPIOB21
root@snapper:~$ echo clear > /proc/gpio/GPIOB26
root@snapper:~$ echo in > /proc/gpio/GPIOB27
root@snapper:~$ hciattach /dev/ttyS1 csr 115200 noflow
CSR build ID 0x07-0x7B
root@snapper:~$ hciconfig
hci0:    Type: UART
    BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0
    DOWN 
    RX bytes:0 acl:0 sco:0 events:0 errors:0
    TX bytes:0 acl:0 sco:0 commands:0 errors:0

root@snapper:~$ hciconfig hci0 down
root@snapper:~$ hciconfig hci0 up  
root@snapper:~$ hciconfig
hci0:    Type: UART
    BD Address: 00:A0:96:13:BB:C1 ACL MTU: 384:8 SCO MTU: 64:8
    UP RUNNING 
    RX bytes:87 acl:0 sco:0 events:8 errors:0
    TX bytes:38 acl:0 sco:0 commands:8 errors:0

root@snapper:~$ hcitool scan
Scanning ...
    00:10:C6:8A:1A:5D    Nicko's Laptop
    00:12:37:79:96:DE    i-mate SP5
    00:16:41:62:10:BA    NC8430

File transfers

Bluetooth supports a protocol called OBEX for transferring files over Bluetooth. To use this, you need to have the following packages installed on the Snapper:

• bluez-utils
• bluez-utils-compat
• obexftp

Once these packages are installed, start up the hci session:

root@snapper:~$ hciattach /dev/ttyS2 csr 115200 noflow
CSR build ID 0x07-0x7B
root@snapper:~$ hciconfig hci0 down
root@snapper:~$ hciconfig hci0 up

Make a note of the HCI MAC address

root@snapper:~$ hciconfig hci0
hci0:   Type: UART
        BD Address: 00:A0:96:13:BB:DA ACL MTU: 384:8 SCO MTU: 64:8
        UP RUNNING 
        RX bytes:87 acl:0 sco:0 events:8 errors:0
        TX bytes:38 acl:0 sco:0 commands:8 errors:0

Start up the D-Bus IPC service:

root@snapper:~$ /etc/init.d/dbus-1 start

Start up the HCI daemon:

root@snapper:~$ /etc/init.d/bluetooth start

Run the obexftp daemon in bluetooth mode

root@snapper:~$ obexftpd -b

This is quite verbose, it is useful to redirect it, and background it. ie:

root@snapper:~$ obexftpd -b >/dev/null 2>&1 &

On the host PC, download a file, use the MAC address from above

andre@tutira:~$ obexftp -b 00:A0:96:13:BB:DA -g /test.ppm

OBEX is a supported protocol by many different filemanagers - for instance it is possible to browse to the Snapper device from the Ubuntu file manager by putting the following URL into the location bar:

obex://[00:A0:96:13:BB:DA]/