xAppSoftware Blog

Building a custom kernel is one of the most important rites of passage for advanced Unices users. This process, while time consuming, will provide many benefits to your system. Unlike the GENERIC kernel, which must support a wide range of hardware, a custom kernel only contains support for your PC's hardware. This has a number of benefits, such as:

• Faster boot time. Since the kernel will only probe the hardware you have on your system, the time it takes your system to boot can decrease dramatically.

All electronic devices, computers and  micro controllers need to exchange data with other devices. One of the most used  way, since 1969, is the serial transmission using the RS232 standard when the EIA defined it. Serial transmission is commonly used with modems and for non-networked communication between computers, terminals, printers and other devices It is  useful for debugging purpose in embedded system. In the following paragraphs we describe the serial transmission in the two forms: Synchronous and Asynchronous. 

Yesterday I had to select some raws (1, 5, 9, ….) from a text file.

This has been a hard job because I was trying to solve the wrong problem……

Really, before coding you should analyze deeply your problem and then you should think which tool you need to use.

However, come on and see my experiments:

First of all we need a test file, I'll use the following:

During my experiments with LTIB I've encoutered the following error

Processing: gettext

=====================

Build path taken because: no prebuilt rpm, 

Testing network connectivity for gpp

OK GPP: is available

Try gettext-0.15.tar.gz.md5 from the GPP

Minicom is a text-based modem control and terminal emulation program for Unix-like operating systems, originally written by Miquel van Smoorenburg, and modeled after the popular MS-DOS program Telix. Minicom includes a dialing directory, ANSI and VT100 emulation, an (external) scripting language, and other features. Minicom is a menu-driven communications program. It also has an auto zmodem download.

One of the more diffcult job, while using the shell, is working with text files to filter their content.

In the following few lines you will find 3 different ways to remove all the duplicate lines from a text file.

First of all, I'll introduce three commands that are available on almost all of the linux distributions, and maybe in all Unix dialects:

uniq

Discard all but one of successive identical lines from INPUT (or standard input), writing to OUTPUT (or standard output).

… an evolving index of practical subjects for the Arduino and Freeduino microcontrollers, as found in the Arduino site, Playground wiki, forum and that big WWW thing. Everything you read here will work on Arduino, the many versions of Freeduino, the Barebones and RBBB, the Boarduino, the iDuino and MAXserial, the eauDuino, the Jeenode, the many Arduino-compatible boards listed below, and of course the new-kids-on-the-block, the Sanguino, the Freeduino EPIC and the Arduino MEGA. Because of the different hardware layouts of these boards, slight modifications will occasionally be required between physical platforms.

Last week I needed to install twidge on a centos 5.7 server.

Truly, twidge is very simple to install into debian (or derived) linux distribution, but I found some problems while installing it into my centos server. 

First of all you shall download the twidge binaries from here:

https://github.com/jgoerzen/twidge/downloads

the twidge binary requires libcurl-gnutls

…

…

simply type the following command:

This simple board has been developed to work together with an arduino board, but it can be used in conjunction with every other boards with an I2C bus and a power suplly into the range [2.7..5]V.

The schemathic for this board is shown in the following picture:

If it is possible you should use constant increments instead of multiplies.

#include <stdio.h>

#include <stdlib.h>

int main1(void)
{
    int i, j;
    for(i=0; i<100; i+=10)
    {
        j=i;
    }
}