I want to interface GPIO driven matrix keypad(4X4) to my linux box.
I saw a driver source file
linux-2.6.32.2/drivers/input/keyboard/matrix_keypad.c
How can I use this to achieve what I want?
I need to control matrix 5x4 keypad, on a processor
i am doing by making one row low at a time, and keeping all other rows high,
by scaning coloums, the corresponding key value becomes low.
my problems is that it is taking much time to respond, like to make gpio
low to high and high to low...
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.
[Code]...
Is giving my a seg-fault right at the ending point where I do the final gather from the MASTER processor.
On my board there is no i2c lines out. So I am trying to get i2c over GPIO by GPIO bit-banging. How to use i2c-gpio driver? Where to set the gpio pin numbers for SCL and SDA?
View 1 Replies View RelatedIf a site reaches a point where 1 machine simply isn't enough to handle it, what exactly is done? I've heard of "round robin DNS load balancing", but that's obviously not going to work if the site has CGI scripts/a substantial backend of any kind as that data will have to be copied over to every server, and I'd guess that that's not feasible. If the site uses a MYSQL server, and a second web server to take over the extra traffic from the first is put up (how would traffic be redirected to it?), when it makes a database query, it still has to connect to the 1st server, so, we're not really solving the problem at all, it remains just the same.
So - how is it done, for large, high traffic sites? (possibly like LQ itself?)
How does one switch between command line and keypad modes when using the jed editor with EDT emulation?
OpenVMS User's Manual states that when using the EDT editor if the user wants to control EDT using the keypad, the mode needs to be set for keypad rather than command line input:
I am using:
with this .jedrc file:
Using the -batch shows that the .jedrc file is correctly located.
i did compiled and installed kernel 3.0.0 on ubuntu 10.04 lucid lynx. well everything is fine except, a error message shown during the booting. Code: error: driver mdio-gpio already registered aborting how can i solve this error?
View 6 Replies View RelatedI have a matrix of dimensions 100 x 100. It is a sparse matrix. It has 460 non-zero values (9540 are zero values).
I want to find inverse of this matrix.
I am trying to install a program and it spews out an error about the .obj/matrix.o file. The output is quoted here:
[code]...
The program I was trying to install is a robot simulator which performs lots of matrix manipulation and linear system solving. I followed every step in the installation guide, except for this one:
[code]...
I am using an imx27 and have a timer set up for 100 ms and a loop to count the pulses while the timer has not expired. I get about 90 % reliable results but every once in a while i get one that is out to lunch. I am reading in a signal that is about 500khz and counting on an transition. I usually get around 85k count. But i will randomly get a 50k count.
View 3 Replies View RelatedI have installed CUDA-BLASTP on C2050.It is giving me an Error:"Bad address Error opening matrix file (null) for reading" while i am running with following query file and dataset:
./CUDA-BLASTP -i ./data/raimondii_contigs.fasta -d ./data/DB_sorted.fasta
and i am using BLOSUM62 as a matrix file which is already present in package.
And getting the error:"Error happened when the number of GPUs is 0" while i am running CUDABLASTP with a part of dataset taking as a query file and dataset is same. above mentioned error is comming from file "CUDA_Blast.cu" included in package.
else
{
printf("Error happened when the number of GPUs is %d
", localGPU_N);
exit(0);
}
i am using windows 7 in my laptop and linux is installed on virtualBox but my problem is the screen is showing small in virtualbox is there any way to enalarge the screen to show like windows screen? i did before by using VGA setting but it made problem me i was not able to use GUI interface i meant graphics interface
it was just showing me Command Prompt.
After changing the keyboard the numeric keys do not work using mandriva 2010.2. It works ok on windows xp and puppy linux.
Under puppy linux the setting is pc 101.
Mandriva the setting is Generic 105 key (intl) PC
Have tried a few different options.
A couple of weeks ago, my keypad stopped working. Not only the numbers, but all keys there. I heard it is a setting in Gnome, but I can't seem to find it.
View 2 Replies View RelatedMy ubuntu was working well for the past few months, and suddenly my numeric keypad wont work now. the num lock's light toggles, but there is no input on the screen while typing.
View 4 Replies View RelatedI have a problem with GDM, I'll explain: When system boot up and GDM show up, always need to press the NUM LOCK key for numeric keypad, for any reason this is disable always
View 9 Replies View RelatedI did a clean install of Fedora 13 on my Toshiba A500 laptop. Suddenly the keypad stops working. no numbers?
View 2 Replies View Relatedhow to permanently disable the 'Pointer can be controlled using the keypad' accessibility function?There was a post about it on launchpad, that I used before and since updating to 9.10 I can't find it.It may be a Gnome bug, and its getting very irritating - maybe 10 - 12 times a day...
View 1 Replies View RelatedI am having issue with my keypad( place where we move the mouse pointer), after installing rhel-6
View 2 Replies View Relatedi have to interface a keypad to at91sam9261 board in linux platform.
View 1 Replies View RelatedI've noticed a bit of a problem here in the last few days...after some point, my numeric keypad stops being a numeric keypad; instead, it controls the mouse (5 right clicks, and the outer keys move the cursor in the appropriate direction). It doesn't appear to happen on boot, as I generally type the numeric bits of my password with the keypad, but some point after. The only common events I can think of where this has occurred is either after connecting to the system via SSH, or after swapping to tty1 (which usually requires re-enabling of numberlock for the terminal to recognize digits, again for the password). No matter what state the NumLock is in (off or on) at this point, the keypad fails to function as a keypad.
View 2 Replies View RelatedI have a keypad with a numeric part to it (as well as the traditional numbers above the alpha keys)It stopped working after I installed Moonlight - and although I have uninstalled Moonlight it is still not working (I may be wrong that Moonlight was the problem, but I can't think of anything else)The number lock indicator still lights up, but there is no response to any numeric input. With the number lock key off, the alternative actions (cursor up, down, etc) work normally.
View 7 Replies View RelatedThe issue i found is that when i connect from ubuntu to windows 2003 server, through rdesktop, using the numeric keypad disables automatically the caps lock setting.To reproduce the problem :
- connect to a windows remote pc through rdesktop
- open notepad
- press caps lock to set the capital letters
[code]....
The result is :
ADKLEFL2390309ajkejkjf
The caps lock has been silently deactivated. Only ubuntu clients are affected by this. I think it's a bug of rdesktop.
i did this code:
reads 1 matrix 2x2 and print!
Code:
# include <stdio.h>
int main()
{
int t, i, M[2][2];
int big[2];
[Code]....
Now i want to create 2 vectors:
1 vector: has the biggest number of every line on the matrix
2 vector: has the lowest number of every column on the matrix
Dear Linux/c++/g++ programmers: the run result on my system, ubuntuLinux10.04(kernel2.6.35-25), gcc4.5.2 is not what book predict
source code
http://examples.oreilly.com/9780596007614/
11-28
11-29
11-24
#include "matrix.hpp"
[Code]...
I'm writing a command-line flash card program in Python. I've tried many existing applications, but none fit my specialized needs.
All of the words I'd like to study are manually added to a text file (study.txt). Each time the software is loaded, it checks for new words in that file and also compares them to a dictionary (a tab-separated file, dictionary.txt), and adds that to a matrix. The flash cards are thus automatically generated from study.txt and dictionary.txt.
Now, the software must manage lots of information about each word I'd like to study and add new information made while interacting with the program (such as when that word should be studied next).
That seems easy to put into a matrix. But what is the best way to put that information in a place where I can pull it back when I run the software tomorrow? Do I need to save the matrix to a CSV file, then convert the CSV file back to a matrix the next time the application is run?
I use Codeblocks as IDE environment for my C programs. I recently added the matrix library Meschach, but unfortunately the headers are not found during compiling/linking process.For instance, my generic program is the one below:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <matrix.h>
[code]...
This program generates the following error during compilation:
Quote:
main.c|3|error: matrix.h: No such file or directory|
And the declaration <matrix.h> is supposed to include the Meschach library, according to the instruction on the below link:
[URL]
Furthermore, I see on folder /usr/include the following:File stdio.h;
Filestdlib.h;
Folder "Meschach", which contains the file "matrix.h".
I have installed fresh fedora 12 & installed many softwares in rpm & tar forms , also i used yum to do installation, all these attempts were successful. But i could not install & configure Epson Dot matrix FX-2175 printer. Epson Dot matrix FX-2175 printer worked fine in my earlier distro fc11.
View 4 Replies View RelatedI have a parallel port Epsom LX 400 dot matrix printer. In the printer proprieties menu it says for make and model Epson 9-Pin Series which it what it is.It's ok when I print directly to the port.
cat file >/dev/lp0
Using Mandriva 2010
This is one of the strangest problems I've run into while programming. Maybe there's just something wrong with my version of gcc or something.
The main problem comes at this point in the code:
Code:
po = makePoFromScorbotXYZPR(X, Y, Z, P, R);
h = makeHB2GFromPo(po);
printf("%le", *h[1][0]); //##################################### Here it has the right value
printf("%s", "
[Code].....