::About::

This is Vijay Kumar's personal blog. Here you will find his explorations into GNU/Linux, Art, Embedded Systems, ...

vijaykumar
AT
bravegnu DOT org

::Archives::

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::Promos::

~vijaykumar

Autotools and Cross Compilation

Tue, 14 Apr 2020

Read at: http://www.zilogic.com/blog/tutorial-autotools.html

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Building Git From Scratch

Thu, 24 Nov 2016

Read at: https://www.linkedin.com/pulse/building-git-from-scratch-vijay-kumar-bagavath-singh/

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Demystifying the MMU - Part II

Thu, 01 Sep 2016

Read at: http://www.zilogic.com/blog/tutorial-mmu-linux-2.html

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Demystifying the MMU - Part I

Wed, 31 Aug 2016

Read at: http://www.zilogic.com/blog/tutorial-mmu-linux-1.html

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Linux Kernel Porting, Jargon Buster

Sat, 06 Aug 2016

Read at: http://www.zilogic.com/blog/jargons-linux-kernel-porting.html

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Finding the Lastest SVN Tag

Tue, 14 Oct 2014

The following script finds the latest tag on an SVN project. The basic idea is to use svn info to find the last revision of the tags folder, and identify the tag with that revision. If the tags folder is not present, or if the tags folder is present but empty, the script prints N/O/N/E.

#!/bin/bash

#
# Usage: svn-latest-tag <SVN-PROJ-URL>
#
# Prints the latest tag or N/O/N/E if none available.
#

if [ "x$1" == "x" ]; then
    echo "Usage: svn-latest-tag <SVN-PROJ-URL>"
    exit 1
fi

#
# Tag name to be printed if none found, less likely to be a real tag
# name. (directories cannot contain the forward slash, right?)
#

latest_tag="N/O/N/E"
tags=$(svn ls $1/tags)
if [ $? -ne 0 ]; then
    echo $latest_tag
    exit 1
fi
last_rev=$(svn info $1 | grep "Last Changed Rev")
if [ $? -ne 0 ]; then
    echo $latest_tag
    exit 1
fi
# echo $last_rev
for tag in $tags; do
    # echo "Checking tag" $tag
    if svn info $1/tags/$tag | grep "$last_rev"; then
        latest_tag=tag
        break
    fi
done
echo $latest_tag

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GSM SMS Daemon on Debian

Mon, 30 Dec 2013

The gsm-utils package provides a GSM SMS Daemon that can be used to send and receive SMS, on a PC equipped with a GSM modem. The package has a couple of issues and pit-falls that makes installing it non-trivial.

Read Full Story ...

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From Make to SCons

Wed, 01 May 2013

Make is the standard Unix tool to build software, and has been around for the past 30 years. The make build system has certain drawbacks that more recent tools are trying to fix. One such tool in SCons. This article aims to help a make user come up to speed with SCons.

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Writing NuttX Applications

Thu, 31 Jan 2013

Read at: http://www.zilogic.com/blog/tutorial-nuttx-hello.html

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Building NuttX

Wed, 23 Jan 2013

Read at: http://www.zilogic.com/blog/building-nuttx.html

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NuttX, Getting Started

Tue, 22 Jan 2013

Read at: http://www.zilogic.com/blog/tutorial-nuttx.html

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MVC Design Pattern

Mon, 30 Apr 2012

Read at: http://www.zilogic.com/blog/tutorial-mvc.html

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Random Number Generation

Thu, 05 Jan 2012

Read at: http://www.zilogic.com/blog/tutorial-random-numbers.html

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Getting Started with ZigBee

Wed, 16 Nov 2011

Read at: http://www.zilogic.com/blog/tutorial-zigbee.html

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Virtualization Lab

Mon, 21 Mar 2011

The development of the FOSS Lab Manual for the Anna University Syllabus is underway at Google Code. The contents for the first Virtualization lab is available in this post. Post your suggestions and feedback.

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Embedded Prog. Using the GNU Toolchain - Slides

Sun, 04 Oct 2009

Slides and handout used at the talk in IITM’s Shaastra 2009. The talk is based on the Cortex-M3 architecture

Slides: PDF ODP
Handout: PDF

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Embedded Programming with the GNU Toolchain

Wed, 13 May 2009

The GNU toolchain is widely used for developing embedded software. But there is lack of proper documentation on how to use the toolchain for embedded firmware development. This tutorial attempts to fill the gap. Read the tutorial online.

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Linux 2.6 Device Model

Sat, 16 Sep 2006

In the 2.4 and earlier Linux kernels, there was no unified database of what devices were present in the system, and how they were connected with each other. The implications of this are:

The user had to grep through log messages to find out if a particular device has been detected by the kernel or not. There was no straight forward method for an application to list out what devices have been detected by the kernel, and whether a driver has been associated with the device.
It was not possible to do proper power management, because this requires information on how the devices are connected in a system. As an example, before a USB controller is powered down, all the USB peripherals connected to that controller had to be powered down.

To overcome these problems, in 2.5 and later kernels a framework has been provided to maintain a device model. This article describes this device model framework. The intention of this article is to provide a bird’s eye view of the working of the device model framework. The specific details of each sub-component can be obtained from various other books/articles and of course the kernel source code.

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