AdaCore Blog

57 entries tagged with #Ada

by Anthony Leonardo Gracio

GPS for bare-metal developers

In my previous blog article, I exposed some techniques that helped me rewrite the Crazyflie’s firmware from C into Ada and SPARK 2014, in order to improve its safety.

#GPS    #Embedded Development    #Makers   

by Emmanuel Briot

User-friendly strings API

User friendly strings API In a previous post, we described the design of a new strings package, with improved performance compared to the standard Ada unbounded strings implementation. That post focused on various programming techniques used to make that package as fast as possible.

#Ada    #gnatcoll   

by Emmanuel Briot

New strings package in GNATCOLL

This post describes the new GNATCOLL.Strings package, and the various optimizations it performs to provide improved performance.

#gnatcoll    #strings    #Ada   

by Jerome Guitton, Jérôme Lambourg, Joel Brobecker

Simics helps run 60 000 GNAT Pro tests in 24 hours

This post has been updated in March 2017 and was originally posted in March 2016.

#Simics    #WindRiver    #GNAT Pro   

by Pierre-Marie de Rodat

GNATcoverage moves to GitHub

Following the current trend, the GNATcoverage project moves to GitHub! Our new address is: https://github.com/AdaCore/gnatcoverage

#GitHub    #GNATcoverage   

by Jorge Real

Writing on Air

While searching for motivating projects for students of the Real-Time Systems course here at Universitat Politècnica de València, we found a curious device that produces a fascinating effect. It holds a 12 cm bar from its bottom and makes it swing, like an upside-down pendulum, at a frequency of nearly 9 Hz. The free end of the bar holds a row of eight LEDs. With careful and timely switching of those LEDs, and due to visual persistence, it creates the illusion of text... floating in the air!

#STM32    #Ravenscar    #Ada    #Makers    #Embedded Development   

by Fabien Chouteau, Arnaud Charlet, Yannick Moy

SPARK Tetris on the Arduboy

One of us got hooked on the promise of a credit-card-size programmable pocket game under the name of Arduboy and participated in its kickstarter in 2015. The kickstarter was successful (but late) and delivered  the expected working board in mid 2016. Of course, the idea from the start was to program it in Ada , but this is an 8-bits AVR microcontroller (the ATmega32u4 by Atmel) not supported anymore by GNAT Pro. One solution would have been to rebuild our own GNAT compiler for 8-bit AVR from the GNAT FSF repository and use the AVR-Ada project. Another solution, which we explore in this blog post, is to use the SPARK-to-C compiler that we developed at AdaCore to turn our Ada code into C and then use the Arduino toolchain to compile for the Arduboy board.

by Pat Rogers

Getting started with the Ada Drivers Library device drivers

The Ada Drivers Library (ADL) is a collection of Ada device drivers and examples for ARM-based embedded targets. The library is maintained by AdaCore, with development originally (and predominantly) by AdaCore personnel but also by the Ada community at large.  It is available on GitHub and is licensed for both proprietary and non-proprietary use.

#Ada    #Devices    #drivers    #STM32    #embedded   

by Raphaël Amiard, Yannick Moy, Pierre-Marie de Rodat

Going After the Low Hanging Bug

At AdaCore, we have a strong expertise in deep static analysis tools (CodePeer and SPARK), and we have been relying on the compiler GNAT and our coding standard checker GNATcheck to deal with more syntactic or weakly-semantic checks. The recent Libadalang technology, developed at AdaCore, provided us with an ideal basis to develop specialized light-weight static analyzers. As an experiment, we implemented two simple checkers using the Python binding of Libadalang. The results on our own codebase were eye-opening: we found a dozen bugs in the codebases of the tools we develop at AdaCore (including the compiler and static analyzers).

#Static Analysis   

by Raphaël Amiard, Pierre-Marie de Rodat

Introducing Libadalang

AdaCore is working on a host of tools that works on Ada code. The compiler, GNAT, is the most famous and prominent one, but it is far from being the only one. At AdaCore, we already have several other tools to process Ada code: the ASIS library, GNAT2XML, the GPS IDE. A realization of the past years, however, has been that we were lacking a unified solution to process code that is potentially evolving, potentially incorrect Ada code. Hence Libadalang.

#Ada    #tooling   

by Yannick Moy

New Year's Resolution for 2017: Use SPARK, Say Goodbye to Bugs

​NIST has recently published a report called "Dramatically Reducing Software Vulnerabilities"​ in which they single out five approaches which have the potential for creating software with 100 times fewer vulnerabilities than we do today. One of these approaches is formal methods. Among formal methods, the report highlights strong suits of SPARK, and cites SPARK projects as example of mature uses of formal methods. NIST is not the only ones to support the use of SPARK. Editor Bill Wong from Electronic Design has included SPARK in his "2016 Gifts for the Techie". So if your new year's resolutions include software without bugs, have a look at SPARK in 2017.

#VerificationTools    #Formal Methods    #SPARK   

by Fabien Chouteau

Make with Ada: DIY instant camera

There are moments in life where you find yourself with an AdaFruit thermal printer in one hand, and an OpenMV camera in the other.

#Makers    #Ada    #STM32    #ARM    #Embedded Development   

by AdaCore Admin

Make With Ada Winners Announced!

Judging for the first annual Make with Ada competition has come to an end and we can now reveal the results.

by Emmanuel Briot

Integrate new tools in GPS

This blog, the first in a series, explains the basic mechanisms that GPS (the GNAT Programming Studio) provides to integrate external tools. A small plugin might make your daily workflow more convenient by providing toolbar buttons and menus to spawn your tool and parse its output.

#GPS   

by Pat Rogers

Driving a 3D Lunar Lander Model with ARM and Ada

One of the interesting aspects of developing software for a bare-board target is that displaying complex application-created information typically requires more than the target board can handle. Although some boards do have amazing graphics capabilities, in some cases you need to have the application on the target interact with applications on the host. This can be due to the existence of special applications that run only (or already) on the host, in particular.

#Bareboard    #Embedded Development    #STM32    #Ada   

by Yannick Moy

Verified, Trustworthy Code with SPARK and Frama-C

Last week, a few of us at AdaCore have attended a one-day workshop organized at Thales Research and Technologies, around the topic of "Verified, trustworthy code - formal verification of software". Attendees from many different branches of Thales (avionics, railway, security, networks) were given an overview of the state-of-practice in formal verification of software, focused on two technologies: the SPARK technology that we develop at AdaCore for programs in Ada, and the Frama-C technology developed at CEA research labs for programs in C. The most interesting part of the day was the feedback given by three operational teams who have experimented during a few months with either SPARK (two teams) or Frama-C (one team). The lessons learned by first-time adopters of such technologies are quite valuable.

#SPARK    #Formal Methods   

by Quentin Ochem

Unity & Ada

Using Ada technologies to develop video games doesn’t sound like an an obvious choice - although it seems like there could be an argument to be made. The reverse, however, opens some more straightforward perspectives.

#GitHub    #Ada    #GNAT    

by AdaCore Admin

Introducing the Make With Ada competition!

If you’ve been looking for a way to start your next embedded project in Ada or SPARK. Then, look no further than the Make with Ada competition!

#MakewithAda    #embedded    #SPARK     #Ada   

by Pierre-Marie de Rodat

C library bindings: GCC plugins to the rescue

I recently started working on an Ada binding for the excellent libuv C library. This library provides a convenient API to perform asynchronous I/O under an event loop, which is a popular way to develop server stacks. A central part of this API is its enumeration type for error codes: most functions use it. Hence, one of the first things I had to do was to bind the enumeration type for error codes. Believe it or not: this is harder than it first seems!

#Code generation    #Ada   

by Fabien Chouteau

Make with Ada: ARM Cortex-M CNC controller

I started this project more than a year ago. It was supposed to be the first Make with Ada project but it became the most challenging from both, the hardware and software side.

#Makers    #Ada    #STM32    #ARM    #Embedded Development   

by Jérôme Lambourg

Efficient use of Simics for testing

As seen in the previous blog article, AdaCore relies heavily on virtualisation to perform the testing of its GNAT Pro products for VxWorks.

#Simics    #WindRiver    #GNAT Pro   

by AdaCore Admin

VectorCAST/Ada: Ada 2012 Language Support

We are pleased to announce that on April 27th our partner, Vector, will host a webinar to showcase their latest VectorCAST/Ada release!

by AdaCore Admin

Provably safe programming at Embedded World

AdaCore continues to build reliable and secure software for embedded software development tools. Last month, we attended Embedded World 2016, one of the largest conferences of its kind in Europe, to present our embedded solutions and our expertise for safety, and mission critical applications in a variety of domains.

#ARM    #emb2016    #embedded    #Embedded World   

by AdaCore Admin

CubeSat continues to orbit the Earth thanks to Ada & SPARK!

Dr Carl Brandon of Vermont Technical College and his team of students used SPARK and Ada to successfully launch a satellite into space in 2013 and it has continued to orbit the Earth ever since! At our AdaCore Tech Days in Boston last year Dr Brandon explained further.

#Ada    #SPARK     #Space    #TechDay   

by Yannick Moy

Formal Verification of Legacy Code

Just a few weeks ago, one of our partners reported a strange behavior of the well-known function Ada.Text_IO.Get_Line, which reads a line of text from an input file. When the last line of the file was of a specific length like 499 or 500 or 1000, and not terminated with a newline character, then Get_Line raised an exception End_Error instead of returning the expected string. That was puzzling for a central piece of code known to have worked for the past 10 years! But fair enough, there was indeed a bug in the interaction between subprograms in this code, in boundary cases having to do with the size of an intermediate buffer. My colleague Ed Schonberg who fixed the code of Get_Line had nonetheless the intuition that this particular event, finding such a bug in an otherwise trusted legacy piece of code, deserved a more in depth investigation to ensure no other bugs were hiding. So he challenged the SPARK team at AdaCore in checking the correctness of the patched version. He did well, as in the process we uncovered 3 more bugs.

#SPARK    #Legacy    #Formal Methods   

by Fabien Chouteau

Make with Ada: Candy dispenser, with a twist...

A few months ago, my colleague Rebecca installed a candy dispenser in our kitchen here at AdaCore. I don’t remember how exactly, but I was challenged to make it more… fun.

by AdaCore Admin

Embedded Product Line Updates

Embedded products are not stand alone, this allows them to have safety, mission critical and real-time requirements that they wouldn’t necessarily have otherwise. The embedded product line provides analyzable, verifiable, and certifiable software for both static and dynamic analysis tools.

#AdaCoreTechDay    #GNAT     #Embedded Development    #embedded   

by AdaCore Admin

Formal Verification Made Easy!

We are pleased to announce our latest release of SPARK Pro! A product that has been jointly developed alongside our partner Altran and following the global AdaCore Tech Days, you can now see the SPARK 2014 talk, Formal Verification Made Easy by AdaCore’s Hristian Kirtchev, on YouTube.

#SPARK Pro    #SPARK2014     #SPARKPro16   

by AdaCore Admin

ERTS and Embedded World conferences 2016

We are pleased to announce that we will be a major sponsor and exhibitor at ERTS, Toulouse and will be exhibiting at Embedded World, Nuremberg in the coming months!

#ERTS2016    #Embedded World    #emb2016    #Embedded Development    #Safety Critical Development   

by Jérôme Lambourg

Porting the Ada Runtime to a new ARM board

A step by step tutorial to adapt the ARM runtime to new MCUs/boards.

#Bareboard    #ARM    #GNAT     #STM32    #Ravenscar   

by Yannick Moy, Jamie Ayre, Emma Adby

Ada Lovelace Bicentennial

The three of us attended the Ada Lovelace Symposium in Oxford (UK). The two days were one fantastic discovery after another about the life, achievements and legacy of Ada Lovelace, the programming pioneer who lent her name to the Ada language.

#Lovelace   

by Emmanuel Briot

Calling inherited subprograms in Ada

This short post describes an idiom that can be used to help maintain complex hierarchies of tagged types, when methods need to call the parent types methods.

#Ada   

by Fabien Chouteau

Make with Ada: Formal proof on my wrist

When the Pebble Time kickstarter went through the roof, I looked at the specification and noticed the watch was running on an STM32F4, an ARM cortex-M4 CPU which is supported by GNAT. So I backed the campaign, first to be part of the cool kids and also to try some Ada hacking on the device.

#SPARK2014     #Smartwatch    #Makers   

by Emma Adby

Modernizing Adacore's Open-Source Involvement

Through the adoption of GitHub we have taken our first step on the way to having a more collaborative and dynamic interaction with, both our users and open source technologies.

#GitHub    #OSS    #Ada   

by AdaCore Admin

ARM TechCon and NBAA Conference 2015

We are continuing to develop tools for use within projects that require reliable and secure embedded software for ARM. Our engineering team have been busy creating demos running on ARM technology, such as Tetris in SPARK on ARM Cortex M4.

#ARM    #SPARK    #Drones    #NBAA2015    #ARMTechCon   

by Maxim Reznik, Nicolas Setton

Using reference types to handle persistent objects

The Ada 2012 standard introduced user-defined references. The main idea behind this is simplifying the access to elements in a container. But you can use them to control the life-circle of your persistent objects. Let's see how it could work.

#Ada 2012    #Persistent Objects    #Programming    

by AdaCore Admin

AdaCore Tech Days 2015

#AdaCoreTechDay    #GNAT Pro    #CodePeer    #SPARK Pro    #SPARK    #QGen   

by Emmanuel Briot

Traits-Based Containers

This post describes the design of a new containers library. It highlights some of the limitations of the standard Ada containers, and proposes a new approach using generic packages as formal parameters to make these new containers highly configurable at compile time.

#Ada    #Containers    #Generics   

by Yannick Moy

New Book About SPARK 2014

If you're somewhat interested in formal methods applied to software, but you never had the chance to really look at it, now is the time! Prof. John McCormick from University of Northern Iowa and Prof. Peter Chapin from Vermont Technical College have written a truly essential book for getting up to speed with formal verification using SPARK. I really love this book, and here are the aspects I love most:

#SPARK    #Formal Methods    #Teaching   

by Raphaël Amiard

Make with Ada : From bits to music

I started out as an electronic musician, so one of my original motivations when I learnt programming was so that I could eventually *program* the sounds I wanted rather than just use already existing software to do it.

#Makers    #Ada    #Embedded Development   

by Jack Mellor

2015: A Space Ada‑ssey

AdaCore has a long history of providing tools and support to develop mission critical applications for Space. Check out this video we made and showed at the conference to see which ones!

#Space    #UK   

by Fabien Chouteau

Make with Ada: "The Eagle has landed"

July 20, 1969, 8:18 p.m. UTC, while a bunch of guys were about to turn blue on Earth, commander Neil A. Armstrong confirms the landing of his Lunar Module (LM), code name Eagle, on the moon. Will you be able to manually land Eagle on the Sea of Tranquillity?

#Makers    #NASA    #GtkAda    #Ada 2012   

by Cyrille Comar

Farewell Robert...

It is with great sadness that I have to announce the death of Robert Dewar...

#Robert Dewar   

by Fabien Chouteau

Make with Ada: All that is useless is essential

A few weeks ago I discovered the wonderful world of solenoid engines. The idea is simple: take a piston engine and replace explosion with electromagnetic field. In this article I will experiment a solenoid engine using a hacked hard drive and a software controller on a STM32F4 .

#Makers    #Ada    #Embedded Development    #Devices    #STM32   

by Anthony Leonardo Gracio

How to prevent drone crashes using SPARK

The Crazyflie is a very small quadcopter sold as an open source development platform: both electronic schematics and source code are directly available on their GitHub and its architecture is very flexible. Even if the Crazyflie flies out of the box, it has not been developed with safety in mind: in case of crash, its size, its weight and its plastic propellers won’t hurt anyone! But what if the propellers were made of carbon fiber, and shaped like razor blades to increase the drone’s performance? In theses circumstances, a bug in the flight control system could lead to dramatic events. In this post, I present the work I did to rewrite the stabilization system of the Crazyflie in SPARK 2014, and to prove that it is free of runtime errors. SPARK also helped me to discover little bugs in the original firmware, one of which directly related with overflows. Besides the Crazyflie, this work could be an inspiration for others to do the same work on larger and more safety-critical drones.

#UAVs    #crazyflie    #SPARK    #Drones   

by Emmanuel Briot

Count them all (reference counting)

Reference countingReference counting is a way to automatically reclaim unused memory. An element is automatically deallocated as soon as there are no more references to it in the program.

#Ada    #memory management    #Storage Pools   

by Emmanuel Briot

Larger than it looks (storage pools)

This post shows how to implement a special storage pool that allocates an extra header every time it allocates some memory. This can be used to store type specific information, outside of the type itself.

#Storage Pools    #Ada    #memory management   

by Jamie Ayre

Verification on Ada code with Static and Dynamic Code Analysis - Webinar

One of the main challenges to get certification in Ada projects is the achievement of 100% code coverage but in most projects an amount of more than 95% structural coverage is hard to achieve. What can you do with the last 5% of code that can't be covered? DO-178C for example, provides a framework for the integration of various techniques in the development process to solve the problem. In this webinar you learn how static analysis and dynamic testing can help complete analysis for pieces of code that are not covered.

#CodePeer    #Code Coverage    #Dynamic Analysis    #Static Analysis    #DO-178    #DO-178C   

by Karen Mason

The Year for #AdaLove

Despite her famously sharp analytical mind, it’s unlikely Ada Lovelace could have predicted the durability of her legacy as the world’s first computer programmer and pioneer for women in computing.

#Ada    #AdaLove   

by Martyn Pike

The latest Mixed Programming with Ada lectures at the AdaCore University

I recently joined AdaCore as a Technical Account Manager with an initial focus on the UK and Scandinavian regions, but for the last 12 months I've been busy working on the AdaCore University. The most recent addition to which is a course on Mixed Language Programming with Ada, and it includes lectures on the integration of Ada with C, C++ and Java. The course covers some advanced topics like mixed language object orientation, techniques for using Ada strong typing to combat known issue with C pointers and the pitfalls that are encountered when mixing native Ada code with Java at runtime. This course clearly demonstrates that Ada has strong support for integration with C, C++ and Java and it proves there are no technical barriers to its adoption in modern mixed language software systems.

#Mixed Language    #AdaCore University    #Java    #C++    #C    

by Yannick Moy

A Building Code for Building Code

In a recent article in Communications of the ACM, Carl Landwehr, a renowned scientific expert on security, defends the view that the software engineering community is doing overall a poor job at securing our global information system and that this is mostly avoidable by putting what we know works to work, to the point that most vulnerabilities could be completely avoided by design if we cared enough. Shocking! Or so it should appear.

#Ada    #SPARK    #Static Analysis    #Security   

by Jamie Ayre

20 years on...

20 Years of AdaCore: Company as Committed as Ever on Safety-Critical Software Solutions

#20th Anniversary    #AdaLove   

by Olivier Ramonat

AdaCore Releases GNAT Pro 7.3, QGen 1.0 and GNATdashboard 1.0

February saw the annual customer release of a number of important products. This is no mean task when you consider the fact that GNAT Pro is available on over 50 platforms and supports over 150 runtime profiles (ranging from Full Ada Support to the very restricted Zero Footprint Profile suitable for safety-critical development). All in all, from the branching of the preview version to the customer release it takes us nearly 4 months to package everything up! Quality is assured through the internally developed AdaCore Factory.

#GNAT Pro    #SPARK Pro    #GPS    #GNATbench    #GNATdashboard    #Ada    #AdaCore Factory    #CodePeer    #QGen   

by Johannes Kanig

Testing, Static Analysis, and Formal Verification

I've recently written an article (in two parts) over at Electronic Design about applying different methods of verification to the same small piece of code. The code in question is an implementation of binary search, and I applied Testing, Static Analysis (using the AdaCore tool CodePeer) and Formal Verification (using the AdaCore tool SPARK 2014).

#Formal Methods    #Static Analysis    #Testing   

by AdaCore Admin

A Busy Schedule Ahead!

If you have a passion for Ada, need more information on our technology or would just like to have a chat, there are a couple of upcoming events where we'd love to meet up. What's more, we'll be launching our brand new product QGen at Embedded World!

#Ada    #Embedded World    #Certification Together    #QGen   

by Tristan Gingold, Yannick Moy

Tetris in SPARK on ARM Cortex M4

Tetris is a well-known game from the 80's, which has been ported in many versions to all game platforms since then. There are even versions of Tetris written in Ada. But there was no version of Tetris written in SPARK, so we've repaired that injustice. Also, there was no version of Tetris for the Atmel SAM4S ARM processor, another injustice we've repaired.

#SPARK    #ARM   

by Cyrille Comar

Welcome To AdaCore's Blog

I'm proud, if not a bit nervous, to be the one firing the very first post on this brand new blog. Why are we starting a corporate blog at this time? There are many reasons for this. The main one is that there are many things happening at AdaCore and around the GNAT technology and we are seeking better ways to make them widely known while offering interested recipients the possibility to react and interact with us.