Programming :: Build Hardware Operated Through Parallel Ports?

Oct 15, 2010

Never done it before, don't know how but its due next week. I am a computer systems student and have been required to built a hardware that will be operated by a program in G++ through the parallel ports. The hardware, thats a piece of cake, the software, now that's were the real problem is. I don't even know were to start.

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General :: Lighting LEDS Using Parallel Ports?

Oct 1, 2010

I would like to add a driver to /dev which can light the LEDS using the parallel port. Where I should start from. I am trying to learn device driver programming, which is quite difficult for me now.

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Ubuntu :: Accessing Parallel Ports From Perl Program

Dec 11, 2010

I am trying to write to the parallel port pins from a Perl program running Ubuntu Linux, to light up led's on a bread board. I've already accomplished this on this same box using a C program, but I cannot get my code below to work. I believe the problem is with the line:
$parport = Device::ParallelPort->new('auto:0');
I've tried different variables between the ('') ticks, but nothing has worked. I use Perl on my web pages for forms, but this has stumped me.

Code is below:
#!/usr/bin/perl require "subparseform.lib"; &Parse_Form; print "Set-cookie:
cart_id=1234; user_id=123;
"; print "Content-type: text/html
"; use strict; use CGI; use Device::ParallelPort;
# use Device::ParallelPort::drv; # use Device::ParallelPort::drv::linux # use Device::ParallelPort::drv::parport
# Set up your parallel port object and tell it what driver to use.
#my $parport = Device::ParallelPort->new('auto:0'); print "It works!!!";

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OpenSUSE Install :: 11.4 - Cannot Configure Local Printer (No Parallel Ports)

Mar 13, 2011

After a fresh install of suse 11.4, Yast cannot configure my local printer (Epson Epl-5700) because there is no parallel port available. How can I make parallel ports work?

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Ubuntu Networking :: Ethernet Ports Not Working On Fresh Build

Feb 27, 2011

I had 2 Ethernet ports and neither of them were working on a fresh build a friend was struggling with. After reading the suggestions to fix the issue and thinking that there had to be an easier way I had an epiphany. I would go to my spare parts box and bring out my old Netgear GA311 and pop it into the slot. So after searching for 10 minutes I found it and installed it. Booted up the rig and it found that right away (SWEET) now that's not the fix anybody can do that, once I updated Ubuntu the on-board ports started working (that's what I'm using now). I can't explain what the update did but for a few bucks a used card in the tool box might not be a bad idea!
Mother board is a Gigabyte GAX58A-UD5 Rev.1 Personally I'm an ASUS guy.

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Ubuntu Security :: IPBLock Operated Before Or After?

Nov 9, 2010

Does anyone know if IIPBlock does it's operation before IPTables completes or after? I'm using a KVM as a Router and GuideDog is Forwarding all HTTP/HTTPS to my KVM Web Server. When looking at my web access.log I see CHINA doing it's stuff, but IPBlock is not blocking that IP ( on the KVM Router.Before doing the KVM Router and just receiving HTTP to mu KVM Web Server, I always had logs of CHINA, but now I don't. So I'm assuming GuideDog is rendering IPBlock useless.Can anyone let me know if your able to connect to my web server at I would like to check even if this setup is working. Because I have a seperate access-thegardenofedenblessing.log for my domain then I do for my localhost (access.log) and CHINA is showing up on my localhost log.

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Programming :: Running Mysqldumps In Parallel?

Oct 1, 2010

I have a bash script with a line like this in it:

Code: mysqldump -uusername -ppassword --master-data=2 --single-transaction --quick --add-drop-table --add-drop-database somedatabase | gzip > ./somedatabase.sql.gz The problem is, I have about 16 databases I'm dumping like this, but it's dumping


So, does putting in a & after a command work in a bash script at all? The thought was, if I want to run them in parallel, should I do this?

Code: #!/bin/bash
./scripts/dumpthis &
./scripts/dumpthat &
./scripts/dumpsomemore & Where "dumpthis" is just the first snippet of code above.

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Programming :: Run Parallel Jobs With Make -j4?

Nov 27, 2010

I use an application called redbutton-browser to access some of the things available on the redbutton digital tv channels. It compiles fine if I use a simple make but fails if I try to run parallel jobs with make -j4. I'd like some help altering the Makefile so that it does a few commands sequentially before it does the rest of the Makefile in parallel.

The relevant bit of the Makefile looks like this:

ISO13522-MHEG-5.c:xsd2c.c ISO13522-MHEG-5.xsd add_instance_vars.conf add_rtti.conf
make xsd2c
./xsd2c ISO13522-MHEG-5.xsd
./add_instance_vars ISO13522-MHEG-5.c ISO13522-MHEG-5.h
./add_rtti ISO13522-MHEG-5.c > rtti.h


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Programming :: Parallel Data Transfer Using Sockets

Feb 25, 2011

I am doing a project where 2 clients connect to server and communicate (chat) and transfer data one after other using sockets. I have working code for this in C language. Now our main aim is to create a communication link where two clients transfer multiple streams data parallely. To be more precise i want to transfer images files and audio files parallel at same time, so is it possible to send data parallel using one socket connection?

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Programming :: Parallel Shell Scripts To Execute Using LAM?

May 29, 2011

i want to know whether we can write a shell script which can utilize 2 CPU's of a cluster...I heard its possible through C Shell [URL] But im familiar with bourne shell only....So is there a possibility to write Parallel Scripts.

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Programming :: Correct Way Of Spawning Parallel Jobs?

Mar 18, 2010

I need to spawn 2 processes in parallel and each takes an hour or so to finish. Is the following one of the correct ways of using `at` in a script run by crontab?

# define the env var, cd, etc... assume everything ok up to this point
date +"The start time is %H:%M:%S"
rm -f a.fin
at now <<END_OF_AT
do_a &> a.log


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Programming :: Conduct Parallel Computing On CUDA?

Jul 29, 2011

I came across some problems. I need to conduct parallel computing on CUDA. I input "uname -a"and read these: "Linux BXSJC #1 SMP Wed Jul 6 14:46:26 UTC 2011 i686 i686 i386 GNU/Linux". I use CUDAtoolkit 4.0. when I input: cd /home/bxsjc NVIDIA_GPU_Computing_SDK/C and "make -i ",the computer returns


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Programming :: Using Parallel Port Mode And I/O Pins?

Aug 8, 2010

I have a little hardware project and I would like to use the parallel port. I basically want to display status code on top of other custom peripheral on an headless server. I only use output as the display (7 segment) is not part of the device itself. The problem is, the parallel port only have 8 standard I/O pins. I have read somewhere that there is a way to change the mode of the port to enable more data pins using a specification not backward compatible with the "classic" mode (so not enabled by default). I didn't find any other information about this. As I would like to have all 17 non-ground pin to avoid using more circuitry than necessary, how to turn this mode on?

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Debian Programming :: Running Programs In Parallel In Bash

Jul 22, 2014

I am trying to replicate what is happening on this page under the tcsh shell, but using the bash shell found in Wheezy. Here is the page I am referring to:[URL] The command I am trying to replicate is on page 6 under figure 2.4. The command is "prompt> ./mem &; ./mem &".

I would like to run the same program twice, concurrently, but do not know how. Note that I am not trying to use a bash script, but rather by simply using syntax on the command line.

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Programming :: Perl - Multiple Child Processes In Parallel?

Sep 3, 2010

I'm looking for a way in Perl to be able to take a list of servers, ssh multiple commands to it and store the results. If I do this process serially, sometimes one server will hang the whole script and if it doesn't, it still takes hours to complete.

I'm thinking what I need to do is make a parent loop that calls out a separate process that passes the server name to the child sub process and then executes all the commands I have defined in its own process. If one server 'hangs', at least that won't stop the script from doing all the other servers in the list.

I'm guessing using the fork() command would serve me best, however, all the online descriptions I have found have been vague at best.

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Programming :: Running Many Tasks In Parallel / But More Clever Than 'make -j'?

Apr 29, 2011

I have a script which basically does many tasks and most of them can run in parallel. The server it runs on has 4 cores, so I changed parts of it to a makefile, and then run them with "make -j 4" which helps a lot. But looking at "top" while it runs, I see it could be improved. Sometimes tasks wait for other servers, so a higher -j value would help. And sometimes multiple tasks are waiting on the same disk, then I think a lower -j value would be better.

The kernel is fairly good at sharing CPU time among the cores, but resources like memory and disks are not shared very well. As an experiment, I tried compiling the kernel with "make -j" with no number. It didn't go very well.

So I wondered if anybody know of a better tool for things like this. I think it should be possible to write something that could change the -j value while it runs.For example:

- Start as many tasks in the background as there are cores. When tasks finish, start another one until done.
- After a little while, check CPU and memory usage to decide if more tasks could run in parallel. Or maybe less?
- If different tasks iowait a lot, check if they wait on the same disk. If so, renice/ionice/suspend some of them. In these situations I think it's better to have them run one after another.
- Other ideas?

I thought of making a script like that, but I doubt I'm the first one with that problem. Also, there are probably lots of things I haven't thought of.

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Programming :: C Program - To Make Scripts That Can Talk To Server's Parallel Port

Jun 27, 2010

I need to make some C program under linux to make some scripts that can talk to my Server's Parallel port by sending some quare signal as high or low, so what i can do ?

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Programming :: Pthread_cond_wait - When Thread1 Invokes The Mutex Lock - No Other Threads Can Access It In Parallel

Mar 2, 2011

If multiple threads operate on a single shared resource, we can lock it using pthread_mutex_lock. Uptill that it is fine, but why again pthread_cond_wait?

int shared=0; // global
// Thread 1

When thread1 invokes the mutex lock, no other threads can access it in parallel. So why again and what for we use, pthread_cond_wait( ).

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Programming :: Build A Simple Program For C Programming Class?

Feb 12, 2011

im trying to build a simple program for my C programming class, this is the source code

#include <stdio.h>
int main()
int length, width, length, height, area, perimeter;
perimeter = width + length + height;
area = width * length + heigth;


i dont see any error (you might)but every time i run it it runs but after it asks me to input for the width i do it but it doesn't take me to the length, it just stays blank until i input another value in the same place for the width, it asks me for 4 inputs in total i don;t know why, and after i run it different times it gives me different values for the perimeter and are. how can I fix this?

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Programming :: Build Ip Packet With C,socket Programming?

Jan 30, 2011

How can we build a packet using C?we have a structure called sockaddr_in which is use to for IPv4,so that we can define address,port and etc in this way:

struct sockaddr_in sock;


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Programming :: Maximum Ports Per Process?

Dec 8, 2010

I'm trying to build a multi-threaded server "C" program connecting to multiple clients. For various design reasons, I thought of having one port number per client. What is the maximum number of ports my process can handle

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Programming :: Opening Ports With Perl?

May 12, 2011

im working on a perl script to automate the setup on a few machines. Does any one know how to open ports using perl?

ps: The systems are redhat so id be editing the iptables file..

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Programming :: Application To Listen At Multiple Ports?

Dec 23, 2010

I am using a C application which connects to various other C applications at different ports through TCP,sends requests to all of them and then waits for the responses. The problem is that when the requests are fewer it gives a good response but with the increase in load the port at which the master application is listening get hogs and is unable to receive the responses.Can you please suggest the best way to tackle this issue? Is it possible for the master application to listen at multiple ports so that the load gets distributed and how?

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Programming :: Parallel Matrix - Matrix Multiplication Seg-faults?

Apr 13, 2011

I just can't find... why is my code seg-faulting?

PHP Code:
Code name: Assignment #7.
File name: slice.c
Program name: Matrix multiplication (parallel version).
Version: 1.


Is giving my a seg-fault right at the ending point where I do the final gather from the MASTER processor.

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Programming :: Build A Spi Program Using C++?

Jan 19, 2011

I'm trying to build a spi program using c++. I'm able to perform half-duplex transfers using the read/write functions, it works perfectly. Now I need to perform a full-duplex transfer, but I'm facing some problems. When I try to receive more than one byte, the slave returns to me only one byte.Ex: I send: FF FF FF FF FF The slave must return: 03 02 00 13 04 But what is happening is:

1st Transfer:

rx: 03 00 00 00 00

2nd Transfer:

rx: 02 00 00 00 00


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Hardware :: Multiserial Ports Identification / How Many Ports Are There

Dec 17, 2010

I'm writting an app for desktop and embedded linux and I need to get information about the multiserial port, and I need to know which port is been used (by a printer, por example).The multiserial I'm using is an Altera Corporation Device 0004, and I just need to tell how many ports are there and how many is been used.

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Debian Programming :: Can't Build Android App

May 29, 2014

I'm trying to setup tools for developing android apps on my Debian Wheezy (backport) system. Eclipse with android plugins is installed. Android SDK installed using android-sdk_r22.6.2-linux.tgz available from URL...My problem is I can't build the android app. The console in Eclipse tells me something (translated) like this;

Code: Select all[2014-05-30 16:36:45 - adb] Unexpected exception 'Cannot run program "/usr/lib/android-sdk-linux/platform-tools/adb": error=2, No such file or directory' while attempting to get adb version from '/usr/lib/android-sdk-linux/platform-tools/adb'

I have searched the web quite extensively but found no solution. It seems the issue may be due to I'm having a 64bit system but building the app requires some 32bit stuff.Some older posts suggest adding package by "apt-get install ia32-libs". In later posts (i.e. URL....

Code: Select alldpkg --add-architecture i386
apt-get update
apt-get install libc6:i386 libncurses5:i386 libstdc++6:i386

However doing apt-get install libc6:i386 asks me to remove 1536 installed packages and installing just 5 new...

Some info about my system ....
Code: Select all>uname -mrv
3.14-0.bpo.1-amd64 #1 SMP Debian 3.14.4-1~bpo70+1 (2014-05-14) x86_64

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Programming :: Ant Build.xml And Regular Expressions?

May 31, 2011

i am trying to create an exclude regular expression for my build.xml. The problem is, that i am trying to find some info on which REs are acceptable/valid for ant... Is ant using standard regular expressions? POSIX ones? Since it is a java-based tool, the "Java REs" are probably valid. I am a little bit confused. If somebody can help me out with the different RE standards, i would be most obliged.

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Programming :: Ant Build.xml File For Eclipse?

Mar 26, 2011

I've spent all day trying to figure how to write an ant build.xml file for eclipse. I must have read 20 sites on the web but some how I just am missing it I continue to get the error

/home/knox/workspace/HW/src/projectBuilder.xml:5: the file attribute is required
here is my file at this point after many variations
<?xml version="1.0" encoding="UTF-8"?>


It works fine if I leave out the Main-Class line in manifest but then the jar is not executable Dick

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Programming :: How To Build VS2005 Projects

Feb 3, 2011

I need to create a SW project both for Windows (written with MS Visual Studio 2005) and Linux. Currently I have a build script for windows and another for Linux. I would like to build the project for both platforms on a single PC. Is there a way of building VS2005 projects with Linux (not using Cmake)?

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