Space Studies David

Android development tips

2011-11-18T03:53:00.001+09:00

Using LogCat to debug program
http://www.droidnova.com/debugging-in-android-using-eclipse,541.html

Heel strike and toe-off

2011-08-27T00:13:00.002+09:00

Heel strike
http://medical-dictionary.thefreedictionary.com/heel+strike

Toe-off
http://www.shoebacca.com/resources/definitions/toe-off.html

Using Kinetisense in Windows 7 (+Vista?)

2011-06-23T11:20:00.000+09:00

(Applies when using provided Linksys Bluetooth adapter)

The manual is based on Windows XP.
Following the instruction of the manual, it requires to install Linksys Bluetooth driver.

However, after installing the driver in Windows 7,
Kinetisense program couldn't receive the data from Kinetisense via Bluetooth,
even with correct COM port setting.

The solution is very simple, just use the driver provided by Windows itself.
To do, don't install the driver manually and uninstall if already has installed.

(After the uninstallation if needed)
Just plug the adapter, then it will automatically install driver from Windows itself.
Then pair Kinetisense at 'Devices and Printers' in Control Panel,
then try 'Real-time data' Kineticsense program with correct COM port settings.
(In my case, COM port 5 and 6 are added as 'Bluetooth COM port', and I received the data through COM5)

install script for usrp1 + gnuradio 3.1.1 + ubuntu 8.04 + bbn or span

2011-05-11T22:30:00.003+09:00

# By Sangwook Bak (POSTECH ITCE, Ph.D candidate, bswprl@postech.ac.kr)

# Tested with USRP1, Ubuntu 8.04, Gnuradio 3.1.1, Virtualbox 4.0.6
# on iMac 27 with Mac OSX 10.6.7

# References
# http://gnuradio.org/redmine/wiki/gnuradio/LegacyUbuntuInstall
# http://www.ubuntu.or.kr/viewtopic.php?p=12079
# https://www.cgran.org/wiki/BBN80211
# https://www.cgran.org/wiki/SPAN80211b
# http://www.mail-archive.com/freebsd-questions@freebsd.org/msg197769.html

# Instead of KAIST repository, replace it to DAUM repository
# as KAIST repository is unstable
sudo wget http://prl85.com/attachment/cfile22.uf@141FAB3F4DCA75FE0ABDB9.list -O /etc/apt/sources.list
sudo apt-get update

# Install necessary libraries
sudo apt-get -y install swig g++ automake1.9 autoconf libtool python-dev fftw3-dev libcppunit-dev libboost-dev sdcc libusb-dev libsdl1.2-dev python-wxgtk2.6 git-core guile-1.8-dev libqt4-dev python-numpy ccache python-opengl libgsl0-dev python-cheetah python-lxml doxygen qt4-dev-tools libqwt5-qt4-dev libqwtplot3d-qt4-dev pyqt4-dev-tools subversion

# Install gnuradio 3.1.1
wget http://ftp.gnu.org/gnu/gnuradio/gnuradio-3.1.1.tar.gz
tar xvfz gnuradio-3.1.1.tar.gz
cd gnuradio-3.1.1
./configure
make
sudo make install

# Settings for using USRP in linux
# Change <username> to actual user id
sudo addgroup usrp
sudo usermod -G usrp -a <username>
echo 'ACTION=="add", BUS=="usb", SYSFS{idVendor}=="fffe", SYSFS{idProduct}=="0002", GROUP:="usrp",
MODE:="0660"' > tmpfile
sudo chown root.root tmpfile
sudo mv tmpfile /etc/udev/rules.d/10-usrp.rules

sudo /etc/init.d/udev stop
sudo /etc/init.d/udev start

# Connect USRP
ls -lR /dev/bus/usb | grep usrp

# There should be some output like following:
# crw-rw---- 1 root usrp 189, 129 2011-05-11 21:01 002

sudo ldconfig

# In case of x11 boot failure,
# add following statement before ‘exit 0’ in /etc/rc.local
# chmod 666 /dev/null

# In case of SSL error when using svn to download bbn or span, do following
sudo chmod 0666 /dev/random

# Download BBN (Both for SPAN and BBN)
cd ../
svn co https://www.cgran.org/cgran/projects/bbn_80211/trunk bbn_80211

# Download and Install SPAN802.11 (Skip if installing BBN802.11)
svn co https://www.cgran.org/cgran/projects/span_80211b/trunk span_80211b
sudo cp span_80211b/images/usrp_std_d2.rbf /usr/local/share/usrp/rev4
sudo cp span_80211b/images/usrp_std_d2.rbf /usr/local/share/usrp/rev2
cp span_80211b/src/host/* bbn_80211/src/examples/

# Install BBN (Both for SPAN and BBN)
cd bbn_80211/
./bootstrap; ./configure; make; sudo make install

RSSI Measurement Questions

2011-05-11T17:02:00.000+09:00

Reference: from Document "The USRP under 1.5X Magnifiying Lens!"

Q) Is RSSI measuring possible with the USRP motherboard and the RFX transceiver board? I know we have the RSSI circuit onboard, but I don't know on which frequencies it scans?

A) The RSSI on the motherboard will tell you the power within approx. +/- 15 MHz from your carrier. You can also get a digital RSSI which will tell you the power within your signal of interest. The way we have envisioned RSSI is as a 3-part measurement:

1) Analog RSSI (we can read it using AUX ADC)

2) Digital RSSI in FPGA (from output of ADCs)

3) Digital RSSI in host (computed however you like, from the channel zed signal sent over the bus by the USRP)

If you want to use the measured analog RSSI, it will measure whatever passes through the analog channel filter. You can only change that bandwidth by changing inductors and capacitors. Note also that analog RSSI is only on the RFX900, RFX1200, RFX1800, and RFX2400. The RFX400, TVRX, and DBSRX do not have that capability.

Q) Is there an RSSI circuit on these boards? I'm using the Flex 2400.

A) The RFX900, 1200, 1800, and 2400 have an RSSI circuit on board. The RFX400 does not. To read the RSSI value, use read_aux_adc(side,0). The RSSI measures the analog signal level after the lowpass filters on the board. These filters are about 15-20 MHz wide. Thus, anything falling in that band will cause a rise in the RSSI value. It is connected to the low-speed adc AUX_ADC_A1, so you need to read that with read_aux_adc(which_dboard,0) See usrp1.i (and in usrp_basic.{cc, h}):

int read_aux_adc (int which_dboard, int which_adc);

The RSSI reads the power in the analog baseband signals (power (I) + power (Q)). The analog baseband will contain signals from approximately +/- 15 MHz from the LO frequency.

Q) I can read the analog RSSI indicator with the auxiliary ADCs, but it is not connected to the gain control. Instead, an auxiliary DAC controls the gain control, right?

A) Yes, that is correct. You can reconfigure the board by moving some resistors around to make it automatic if you wanted.

Q) How do I set the mux register to look at the AUX_ADC inputs?

A) You don't use the mux register to read the AUX_ADCs. See usrp/host/lib/usrp_{basic,standard}.h for docs on all of this stuff. See especially usrp_basic_rx::read_aux_adc and usrp_basic_tx::read_aux_adc

/*!
* \brief Read auxiliary analog to digital converter.
*
* \param which_dboard [0,1] which daughterboard
* \param which_adc [0,1]
* \param value return 12-bit value [0,4095]
* \returns true iff successful
*/
bool read_aux_adc (int which_dboard, int which_adc, int *value);

/*!
* \brief Read auxiliary analog to digital converter.
*
* \param which_dboard [0,1] which daughterboard
* \param which_adc [0,1]
* \returns value in the range [0,4095] if successful, else READ_FAILED.
*/
int read_aux_adc (int which_dboard, int which_adc);

The second version has a python binding:
v = u.read_aux_adc(0, 0)
where u is an instance of a usrp.source_c or usrp.sink_c
The bad news is that these are read asynchronously using a slow path over the USB. You probably can't read them fast enough to sample to your input signal, and the sampling is asynchronous.

Document "The USRP under 1.5X Magnifiying Lens!"

2011-05-11T15:28:00.000+09:00

Original from http://gnuradio.org/redmine/attachments/129/USRP_Documentation.pdf
Good document for USRP beginner..

In case of future unavailability (sometimes, it really happens), I also uploaded the document in my blog...
Download it

Installing RRDTool on Mac

2011-05-11T15:11:00.001+09:00

Install macport 1.9.2
(http://www.macports.org/install.php)

sudo port -d selfupdate
sudo port install autoconf glib2 cairo pango

On RRDTool source folder,

./autogen.sh
./configure
make
sudo make install

On rrdtool/examples folder,

./minmax.pl
./4charts.pl

Microsoft .NET Chart Control Resources

2010-06-22T14:47:00.000+09:00

Microsoft Chart Controls for Microsoft .NET Framework 3.5
(From .Net Framework 4.0, chart control is embedded in the framework)
http://download.microsoft.com/download/c/c/4/cc4dcac6-ea60-4868-a8e0-62a8510aa747/MSChart.exe

Microsoft Chart Controls Add-on for Microsoft Visual Studio 2008
http://download.microsoft.com/download/e/6/f/e6fedd87-9119-4037-8da8-e5de429d940a/MSChart_VisualStudioAddOn.exe

Microsoft Chart Controls for .NET Framework Documentation
http://download.microsoft.com/download/5/4/a/54ad5fde-dd31-4a16-82db-72885da83a1f/DataVisChartControl.exe

Samples for Microsoft Chart Controls (Winforms, Net 3.5)
http://code.msdn.microsoft.com/Project/Download/FileDownload.aspx?ProjectName=mschart&DownloadId=3500

SOAP Resources

2010-06-10T21:35:00.000+09:00

Microsoft Soap Toolkit 2.0 (For C, C++, and C#)

SoapToolkit20.exe

SOAP Tutorial from W3Schools

SOAP Tutorial.pdf

COMMELL LS-572 Resources

2010-03-11T20:10:00.000+09:00

There are some official websites about LS-572 product, but I couldn't get resources except datasheet.

So I searched resources from web and cd provided with LS-572, and collected here.

Datasheet

ftp://ftp.commell.com.tw/Public/Datasheet/SBC/LS-572.pdf

Manual

LS-572 Manual.pdf

Drivers

Intel Q35/ICH9DO Chipset INF Driver
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/Chipset/infinst_autol.exe

(For XP)

VGA (Intel GMA3100)
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/VGA/win2k_xp14323.exe

(For XP)
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/VGA/winvista_1573.exe

(For Vista)
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/VGA/winvista64_1573.exe

(For Vista x64)

LAN (Intel 82573L)
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/LAN/PRO2KXP.exe

(For XP)
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/LAN/PROVISTA32.exe

(For Vista)
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/LAN/PROVISTAX64.exe

(For Vista x64)

Audio (Intel ICH9DO)
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/Audio/WDM_R173.exe

(For XP)
ftp://ftp.commell.com.tw/COMMELL/support/FS97D/Driver/Audio/Vista_R175.exe

(For Vista)

RAID (Intel® ICH6M)
http://downloadmirror.intel.com/17296/a08/iata78_cd.exe

(For XP/VIsta)

Cf)

Official product website

http://www.tcommate.com.tw/Product/SBC/LS-572.HTM

Official technical document website

http://www.tcommate.com.tw/Support/SBC/LS-572(S).htm

March 10th, 2010

2010-03-10T21:22:00.000+09:00

Picture from http://www.jewelrywishes.com/flowers-and-hearts/14k-yellow-gold-large-mesh-heart-pendant-p39123.html

Installing gnuradio in ubuntu

2010-03-10T20:10:00.000+09:00

(Tested on Ubuntu 9.04)

Installing gnuradio in ubuntu is so simple.

sudo aptitude update

sudo aptitude install gnuradio

sudo addgroup usrp

sudo addgroup <USERNAME> usrp

That's it!

To test whether gnuradio is successfully installed, use following python source file to test.

(http://www.funwithelectronics.com/sdr/simplegui.py)

Download this file, and type 'python simplegui.py' in shell.

If you get a display like this, gnuradio is successfully installed.

(Ignore the error message with "RuntimeError: 'maximum recursion depth exceeded while calling a Python object' in <type 'exceptions.RuntimeError'> ignored")

References:

http://gnuradio.org/redmine/wiki/gnuradio/DebianPackages
(GNU Radio - DebianPackages - gnuradio.org)
http://funwithelectronics.com/?id=10
(Fun With Electronics - Make a simple GNU Radio GUI)

Values of Object Type Symbolic Constants

2010-02-23T17:13:00.000+09:00

I just typed all the constants, and just printed out the value.

I hope it helps!

(Getting values of OPC_OBJTYPE_ESBASE, OPC_OBJTYPE_PB_STAN was unavailabile. When used, compilation was unsuccessful.)

OPC_OBJTYPE_ANT	23
OPC_OBJTYPE_BURX	20
OPC_OBJTYPE_BURXCH	29
OPC_OBJTYPE_BUTX	19
OPC_OBJTYPE_BUTXCH	30
OPC_OBJTYPE_COMP	44
OPC_OBJTYPE_DEMAND_CONN	11
OPC_OBJTYPE_DEMAND_FLOW	12
OPC_OBJTYPE_ESBASE	-
OPC_OBJTYPE_ESINTERFACE	47
OPC_OBJTYPE_ESYS	46
OPC_OBJTYPE_GENERIC	45
OPC_OBJTYPE_INVALID	2147483647
OPC_OBJTYPE_LKBUS	8
OPC_OBJTYPE_LKDUP	7
OPC_OBJTYPE_LKSIMP	6
OPC_OBJTYPE_LKTAP	9
OPC_OBJTYPE_NODE_FIX	3
OPC_OBJTYPE_NODE_MOB	4
OPC_OBJTYPE_NODE_SAT	5
OPC_OBJTYPE_PATH	10
OPC_OBJTYPE_PB_STAN	-
OPC_OBJTYPE_PBAA	38
OPC_OBJTYPE_PBCA	39
OPC_OBJTYPE_PBCPL_NODE	37
OPC_OBJTYPE_PBGS	41
OPC_OBJTYPE_PBSA	40
OPC_OBJTYPE_PBSTD_DEMAND	36
OPC_OBJTYPE_PBSTD_LINK	34
OPC_OBJTYPE_PBSTD_NODE	33
OPC_OBJTYPE_PBSTD_PATH	35
OPC_OBJTYPE_PROC	13
OPC_OBJTYPE_PTRX	18
OPC_OBJTYPE_PTRXCH	27
OPC_OBJTYPE_PTTX	17
OPC_OBJTYPE_PTTXCH	28
OPC_OBJTYPE_QUEUE	14
OPC_OBJTYPE_RARX	22
OPC_OBJTYPE_RARXCH	31
OPC_OBJTYPE_RATX	21
OPC_OBJTYPE_RATXCH	32
OPC_OBJTYPE_STATWIRE	25
OPC_OBJTYPE_STRM	24
OPC_OBJTYPE_SUBNET_FIX	0
OPC_OBJTYPE_SUBNET_MOB	1
OPC_OBJTYPE_SUBNET_SAT	2
OPC_OBJTYPE_SUBQ	26
OPC_OBJTYPE_WDOMAIN	48

윈도우에서 Incoming ICMP 패킷 허용하기

2009-02-26T13:29:00.000+09:00

그렇게 어려운 방법은 아님.
방화벽 해제 or Incoming ICMP 패킷 허용하도록 규칙 설정.

아래 첨부된 문서 참조할것.

WindowsXP나Vista에서들어오는ICMP패킷허용하기.pdf

OSLab Links for FDD Driver

2009-02-26T13:27:00.000+09:00

예전 운영체제실습에서 FDD 제어 드라이버를 만들 때 참조했던 자료들.

Extract Floppy Disk Geometry from the Boot Sector (코드)
http://www.codeguru.com/cpp/cpp/cpp_mfc/files/article.php/c13809/

FAT Root Directory Structure on Floppy Disk and File Information (코드)
http://www.codeguru.com/cpp/cpp/cpp_mfc/files/article.php/c13831/

Understanding FAT (개념)
http://users.iafrica.com/c/cq/cquirke/fat.htm

FAT File System Troubleshooting (개념)
http://users.iafrica.com/c/cq/cquirke/fixfat.htm

Understanding File System (FAT) (개념)
http://www.file-recovery.net/recovery-understanding-file-system-fat.htm

Partition Boot Sector (개념)
http://www.file-recovery.net/recovery-FAT-BOOT-sector.htm

BIOS Parameter Block and Extended BIOS Parameter Block Fields (개념)
http://www.file-recovery.net/recovery-FAT-BOOT-sector-bios.htm

FAT File Allocation Table (개념)
http://www.file-recovery.net/recovery-file-allocation-table-FAT.htm

FAT Folder Structure (개념)
http://www.file-recovery.net/recovery-FAT-folder-structure.htm

Resin 3.2에는 jsdk-XX.jar이 없다?

2009-02-26T13:24:00.000+09:00

학교 웹개발 수업에서는 Resin 3.1을 사용했었다.
3.1에서는 servlet에 관련된 sdk를 사용하기 위해 classpath에 jsdk-XX.jar을 추가했다.

하지만....
Resin 3.2를 설치해 보면, 웹 서버의 lib 폴더에 jsdk-XX.jar가 없다.
처음에 그래서 "Resin 신버전에선 servlet을 지원하지 않는 것인가?" 하는 의문을 가졌으나....
구글과 오랜 시간 동안 대화를 나눈 결과,

jsdk-XX.jar 대신 javaee-XX.jar을 classpath에 추가하면 된다는 결론을 얻었다.
(3.2.1에서는 javaee-16.jar이었다.)

이 파일에 servlet 관련 api들이 들어있다.