http://wiki.archlinux.org/index.php/Subversion_backup_and_restore
svnadmin dump /path/to/reponame > /tmp/reponame.dump ;
scp -rp /tmp/reponame.dump user@server.domain.com:/tmp/
http://trac.edgewall.org/wiki/TracBackup
$ trac-admin /path/to/projenv hotcopy /path/to/backupdir
When life gets tough, you either get busy living or get busy dying. And I know which I would choose.
2010年6月27日星期日
Bash for loop
#!/bin/bash
for i in $( ls ); do
echo item: $i
done
http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-7.html
2010年6月26日星期六
small linux system
http://www.damnsmalllinux.org/download.html
http://puppylinux.org/main/index.php?file=Download%20Latest%20Release.htm
http://puppylinux.org/main/index.php?file=Download%20Latest%20Release.htm
2010年6月25日星期五
Jensen's inequality
if p1, ... pn are positive number which sum to 1 and f is real continuous function that is convex.
then,
sum_i Pi f(x_i) > f(sum_i Pi x_i)
then,
sum_i Pi f(x_i) > f(sum_i Pi x_i)
Tmote programming
--------------------------
To compile:
gcc PER.c -o PER libmote.a -lm
--------------------------
Install the Transmitter:
cd SendingMote/
make tmote
motelist
make tmote install
cd RssiBase/
make tmote
motelist
make tmote install
--------------------------
Rx:
./combine /dev/ttyUSB0 115200
./combine /dev/ttyUSB4 115200
noise floor:
gcc noise_offset_average.c -o noise_offset_average libmote.a
./noise_offset_average /dev/ttyUSB0 115200
http://moteserver.uv.es/documentation.php
http://www.springerlink.com/content/t24g5763r7j765tw/
http://circuit.ucsd.edu/~curts/courses/ECE284_F05/projects/Project2_Telos.pdf
How to do RSSI reading without packet transmission:
http://docs.tinyos.net/index.php/Boomerang_RSSI_Readings
To disable CCA (CSMA) in Tmote:
In CC2420CsmaP.nc
ccaOn = TRUE;
to
ccaOn = FALSE;
and this will turn off the cca.
To remove CRC check for CC2420:
1. Modify CC2420ActiveMessageP.nc in /opt/tinyos-2.1.0/tos/chips/CC2420
remove line 173-175:
//if(!(call CC2420PacketBody.getMetadata(msg))->crc) {
// return msg;
//}
2. Modify CC2420ReceiveP.nc in /opt/tinyos-2.1.0/tos/chips/CC2420/receive
modify line 294-303:
// We may have received an ack that should be processed by Transmit
// buf[rxFrameLength] >> 7 checks the CRC
if (rx_buf ) {
uint8_t type = ( header->fcf >> IEEE154_FCF_FRAME_TYPE ) & 7;
signal CC2420Receive.receive( type, m_p_rx_buf );
post receiveDone_task();
return;
}
3. install code to Base Notes:
cd RssiBase
make micaz clear
make micaz
make micaz install,0 mib510,/dev/ttyUSB0
4. Compile C codes:
gcc SER_1.c libmote.a -o SER_1 -lm
5. Execute
./SER_1 /dev/ttyUSB1 57600(or 115200)
To compile:
gcc PER.c -o PER libmote.a -lm
--------------------------
Install the Transmitter:
cd SendingMote/
make tmote
motelist
make tmote install
cd RssiBase/
make tmote
motelist
make tmote install
--------------------------
Rx:
./combine /dev/ttyUSB0 115200
./combine /dev/ttyUSB4 115200
noise floor:
gcc noise_offset_average.c -o noise_offset_average libmote.a
./noise_offset_average /dev/ttyUSB0 115200
http://moteserver.uv.es/
http://www.springerlink.com/
http://circuit.ucsd.edu/~
How to do RSSI reading without packet transmission:
http://docs.tinyos.net/index.php/Boomerang_RSSI_Readings
To disable CCA (CSMA) in Tmote:
In CC2420CsmaP.nc
ccaOn = TRUE;
to
ccaOn = FALSE;
and this will turn off the cca.
To remove CRC check for CC2420:
1. Modify CC2420ActiveMessageP.nc in /opt/tinyos-2.1.0/tos/chips/CC2420
remove line 173-175:
//if(!(call CC2420PacketBody.getMetadata(msg))->crc) {
// return msg;
//}
2. Modify CC2420ReceiveP.nc in /opt/tinyos-2.1.0/tos/chips/CC2420/receive
modify line 294-303:
// We may have received an ack that should be processed by Transmit
// buf[rxFrameLength] >> 7 checks the CRC
if (rx_buf ) {
uint8_t type = ( header->fcf >> IEEE154_FCF_FRAME_TYPE ) & 7;
signal CC2420Receive.receive( type, m_p_rx_buf );
post receiveDone_task();
return;
}
3. install code to Base Notes:
cd RssiBase
make micaz clear
make micaz
make micaz install,0 mib510,/dev/ttyUSB0
4. Compile C codes:
gcc SER_1.c libmote.a -o SER_1 -lm
5. Execute
./SER_1 /dev/ttyUSB1 57600(or 115200)