DBASEII and Mr. SPOCK: Today we lost our first officer Mr Spock leaving definitely the Enterprise star-ship but not our hearts. Few people really knows the importance of Mr Spock on influencing our modern databases. In 1979, a programmer called Wayne Ratlif created a database that could accept common English words like “find”, “insert”, “append”, “browse”, etc.. Wayne worked for Jet Propulsion Laboratories in Pasadena.

It was possible also to display messages in the screen creating menus, print data and have real applications trying to bring the natural manner that Mr Spock accessed data in the sophisticated Enterprise. The database received the name of Mr. Spock home planet, in other words, Vulcan. Later the software turns commercial and it was renamed as DBASEII even not having a first version… Vulcan or DBASEII was able to run in 24KRAM computers based on Z80 processor until huge main frames and introduced a modern database management even not being a full relational database. I worked with “Vulcan” database when I was 13 years old creating an application for storage control. I am thankful for all inspiration that Mr Spock brought during decades to our lives and our technology.

R.I.P. Mr Spock or Leonard Simon Nimoy and thanks for all!!!

(March 26, 1931 – February 27, 2015)

My book is available now !!!!

After 11 months working all weekends and mostly all nights (late nights) and besides my duty on Intel, the book “Intel Galileo and Intel Galileo Gen 2: API Features and Arduino Projects for Linux Programmers” is ready in the printers and it will be available for shipping.

One of the conditions that make me to accept the proposal to write this book is “the digital book must be FREE”. The focus is to attend our maker/open-source community, colleges or any individual interested in our boards… You will be able to download the digital content on Apress website or you can order the hardcopy here http://www.amazon.com/Intel-Galileo-Gen-Features-Programmers/dp/1430268395/ref=sr_1_2?ie=UTF8&qid=1419625128&sr=8-2&keywords=intel+galileo+intel+galileo+gen+2.

The book has a little more than 700 pages (in fact was more than 800 but we reduced) and covers several topics like details of our Yocto build process, the integration of 7160 LTE modem, OpenCV with emotion recognition, 6 analog board control channels to control robotic arms, and much more info.

The front matter is below:

 What is in the book ?

Chapter 1 discusses the hardware design of Intel Galileo and Intel Galileo Gen 2, and the construction of serial and FTDI cables for debugging using Linux terminal consoles.

Chapter 2 explains how the Yocto build system works, and how to generate your custom SPI and SD card images. It also presents how to compile, install and use the toolchains for native applications development, and discusses procedures to recover bricked Intel Galileo boards.

Chapter 3 shows how to install and use Arduino IDE;  how to install the drivers needed in the computer or virtual machine used, running real examples of interacting sketches with simple circuits. It also brings a practical project that integrates Python, POSIX calls and sketches to send an alert when an email is received.

Chapter 4 discusses the new APIs and hacking techniques created especially for Intel Galileo and Intel Galileo Gen 2 boards. It contains a broad discussion about clusters architecture, how GPIOs are distributed and their respective speed limits.

A practical project of how to overcome Intel Galileo’s limitation and make the temperature sensor DHT11 work is presented.

Chapter 5 presents networking APIs and hackings using Ethernet adapter and Wi-Fi mPCIe cards. Also explains how to install new Wi-Fi cards and how to share Internet access between Intel Galileo and computers. This chapter also explains how to hack the Arduino IDE to download sketches using network interfaces instead of USB.

Chapter 6 is a practical project about tweeting using Intel Galileo boards with new OAuth authentication without intermediary computers or servers. The project uses RTC (Real Time Clock) with external coin batteries and Wi-Fi mPCIe cards.

Chapter 7 shows techniques to use V42L and OpenCV libraries and how to capture images, videos and detect face and emotions using a webcam. This chapter also explains how to change the Linux BSD to support eglibc instead uClibc and generate the toolchain to compile C/C++ programs. There are also examples of OpenCV in Python.

Chapter 8 presents a low cost project to create moisture sensors based in scrap materials and galvanized nails.

Chapter 9 shows a practical home automation project implementing a webserver using node.js , interacting with multiples sensors as motion and temperature, keypads and switch relays.

Chapter 10 explains how to install and use PoE (Power of Ethernet) modules with Intel Galileo Gen 2.

Chapter 11 discusses basic principles in robotics, how to design and control a robotic arm using analog controllers and shows a practical project using a 6 DOF robotic arm with a mechanical gripper and another one built with ground coffee.

Chapter 12 discusses how to connect a XMM 7160 LTE modem and use data channels in real networks using Intel Galileo boards.

Chapter 13 is only available online. It shows a practical project of how to design and build a low cost robot head with animatronic eyes and mouth that  expresses emotions. This chapter is available online at

http://www.apress.com/9781430268390, under the Source Code/Downloads tab.

What about Intel Edison ?

In few months we will have a “mini version” of this book including Intel Edison and the digital version will be also FREE.


Many thanks for ALL!!! I hope you appreciate the book.

Installing OpenGrok and Tomcat 7 on Ubuntu 13.04 quickly

If you are a developer you need a good source code navigator. I have used cscope to navigate and edit code directly from my terminal dismissing any graphical user interface but some people like to use the sourcenav or net beans ecosystem. However both are graphically nice but are “heavy” apps and also, if you want to share a way with your co-workers how to browser your code you will need to install the apps in different desktops.

But what about to have a fast way to navigate in your code, have fast crossed references  and share your source code with your co-workers dismissing the installation of source navigators on different desktops using your web browser ?

If you need something like this or if you wants a fast and easy installation of a good source navigation, I recommend OpenGrok. To be honest, even if I do not need to share my code with anyone, I use in my machine only for my personal code browsing.

OpenGrok runs as a webapp that means you and your co-workers can use your favorite browser navigator. Chrome, Firefox, Internet Explorer, whatever! you only need your preferable one to enjoy the code.

Considering OpenGrok is web based you will need to install a web server to be used as servlet server. OpenGroks supports Tomcat or Glassfish.

I am personally using tomcat 7 in my ubuntu 13.04. Let’s see the 3 basic steps:

Continue reading

How to download quickly the kernel source code used on your Ubuntu

I am really sorry if this post is so shot and newbie but I will use these instructions on my next posts.

Try typing:

#> sudo -i

#> cd /usr/src

#> apt-get source linux-image-$(uname -r)

If fails complaining about dpkg-source, you need the debian package development tools.

Install it doing:

#> apt-get install dpkg-dev

and try to download the source again.

You can get using git. If you prefer this method check this page.

I am using root (sudo -i) on this example because next post I will compile some code that requires the right permission to run the example codes.

Debugging tombstones with ndk-stack and addr2line

I really like to work with several components in a system including linux kernel or keep my emotions on userspace.

If you work with android and your are a real engineer, it is very difficult to resist the native support using Android NDK. If your software requires performance using graphic API like in OpenGL or if you need to access some specific information provided by some native library, the NDK fits for you.

However, bugs in native side sometimes takes time and usually it is not an easy and fast task. If you have the device and an easy way to reproduce the issue, it is ok but suppose you need to collect logs from remote users and the scenario is very difficult to reproduce. Some cases the users even see the crash visually but the system contains the logs blocking the approval of your software that must be completed to some costumer.. at this point the program/project managers team are “talking” in your ears… “fix it!”.

Working with Android, every time a process that runs on native side crashes, we have some small pieces of your stack in files called tombstones.

The tombstones are located at /data/tombstones as isolated files (one files represents one crash) or you can see them in your logcat Take a look in the adb shell:

root@android:/ # find . |grep tombs

root@android:/ #

The tombstone inform you about:

  1. Build fingerprint
  2. Crashed process and PIDs
  3. Terminated signal and fault address
  4. CPU registers
  5. Call stack
  6. Stack content of each call

I will not post a full tombstone here. Check the /data on your device and you will observe the 7 sessions mentioned above . Let’s go straight to the point.. how to debug the stack in tombstones files!

Continue reading

Android Services: Recommendations when using AIDL for continuous service and low current drain impact

Last month a lot things happened.. I lost my dad, moved to another location .. thus, this blog was not the priority but was not forgotten.

This post is related to some issues I have observed in some Dalvik implementation and some recommendations is you want to create a service that must remains running all the time even after a device power on/off or reset.

Suppose you need to create a “light” service that must be:

1) starts when every time your devices boots.

2) contains very nice parcelable objects using aidl syntax sharing them thru IPC

3) is used to monitor something every X minutes but cannot impact the current drain.

4) the service must use the “uptime”, I mean, must reports “how long” is running

5) must be able to receive interruptions and reports them

A good application of this service could be an alarm central unit for your car. You could create this project using your old Android phone and transforming your old phone and hidden it in your car. You can also connect this old phone disassembling a 12V charging and connecting in some spot using the terminals of your battery.

So, let’s go to some mistakes.. see the list below:

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POSIX Threads and Joins – Parallel Programming – PART 1

During a long time we were “blessed” with computers that had only single CPU. The single CPU usually had a mediocre single core and thread. All software developed on that time executed sequential processing.

However, multi-cores and multi-threads processors were introduced in the market but if you do not develop your software trying to explore the hardware advantages your software might have the same performance if running in a single cpu machine.

You need to think also if you software will run in a computer isolated or if your software will be able to run in multiple computers sharing a common network and organize different tasks to resolve a common problem.

Today, I will write this post for my own reference using the POSIX threads and how to have the best usage of joins and mutex implementation. I am running in a ubuntu 10.04 but if you are running Windows you can use these examples installing the POSIX win32 compatibility module or installing Cygwin to simulate a linux shell.

Code compilation

All codes on this post were compiled using gcc and invoking the POSIX libraries thru command like under ubuntu 10.04. For example you can use:

gcc -pthread <my source code.c>


The first code is related to a model where we do not share the same memory space and there is no policy regarding the thread priorities or resources access management (although the threads runs in the same process sharing the same memory space this first example to resource are conflicted).

It is a simple code that creates 3 threads, passes arguments to them using strings and integers and then they are terminated.

Take a look in the code below:

Continue reading

I love a Duck! Why DuckDuckGo search engine is better than Google ?

I am kind of person – or alien as they call me in USA even being from Brazil not Mars :), that usually try different ways to improve how I study or work. I am using a new search engine and I am really loving it! Click in DuckDuckGo.com and try yourself.

Why DuckDuckGo ?

The quality of results and how you can filter are much more better than google search engine. Google already recognized them as a real competitor and looks like Mr Larry Page not dared to say “really bad job” as he did with new facebook graphic search.

Done based in github, perl5 and other open softwares, I will tell you why this search really rocks!

What they do ?

  1. do not track you !! it means privacy! Your personal information is safe!
  2. do not use bubble-filter !! Oh yeah this really makes different because I can have different type of results not based what the system “think” compatible with my profile
  3. They have a feature called !bang. Bangs are very cool.. if you wanna have all searches in a specific site you only add “!” following the site.. for example if you type in the search box “stamps!ebay” the search goes directly to ebay showing the search you did!!! The same can be done with facebook, amazon, and multiples sites.. some sites you have option to use bang with few words, for example, you can use “asus!a” to search in amazon.
  4. When you make a search if have a list with results and in front of each link there is a icon related to the site you searched. If you click in the icon instead the link, the engine re-searches and give you more results related to that site!
  5. There is not “NEXT PAGE”.. Only scroll and the new searches will be automatically loaded

Newton Raphson C++ class for float division and other functions

Some months ago when I was searching for a job, a company asked to write a class to evaluate float divisions and find srq() of a number using Microsoft Visual C++. But the challenge was in create a class to perform this operations avoiding the division operator “/”.

I decided to use a old methodology I learnt when I was in college, more specifically in the computer methods. The name of method is Newton Raphson.

About the Newton-Raphson’s Method

The idea is very simple… given a function you guess a initial x0. Then you evaluate the tangent function on that point using derivative function. You will have x1… then you do the same with x1, and even so… Continue reading