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  • Embedded Linux: Memory Fragmentation

    - by waffleman
    In many embedded systems, memory fragmentation is a concern. Particularly, for software that runs for long periods of time (months, years, etc...). For many projects, the solution is to simply not use dynamic memory allocation such as malloc/free and new/delete. Global memory is used whenever possible and memory pools for types that are frequently allocated and deallocated are good strategies to avoid dynamic memory management use. In Embedded Linux how is this addressed? I see many libraries use dynamic memory. Is there mechanism that the OS uses to prevent memory fragmentation? Does it clean up the heap periodically? Or should one avoid using these libraries in an embedded environment?

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  • MS WebBrowser + Embedded HTML Resource + res:// Protocol

    - by letthewookiewin
    Hi, I have an embedded HTML resource (helloworld.htm) inside my Visual Studio project. (Ie, I've added an HTML file to the project and set its properties to "Embedded Resource". Within the same application I have a WebBrowser control. I'd like to direct the WebBrowser control to display the HTML resource using the res:// protocol. But I can't figure out the exact format needed to address an embedded resource using this style of URL. Any ideas? Thanks!

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  • Are there any embedded languages that can be embedded into C# and actionscript?

    - by AnthonyF
    I'm looking for a embedded language that can be used to script common code between a server app written in C# and a client app written in Flash/Actionscript. It is important that the embedded language interpreter run natively in the environment it is embedded into. For example, it cannot load any external C libraries (i.e. python, neko). Does such a thing exist for these two languages? Perhaps there is some minimal interpreter that could be easily ported to both? Thanks!

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  • What is the easiest x86 Embedded Linux?

    - by QAH
    I want to play around with some embedded linux. I want it to be able to run on an x86 processor (for start, it will be running on my regular PC). I have looked online, but the ones I have found seem hard to setup or lack proper documentation. So what are some good embedded x86 compatible linux distros that are easy to setup or have good documentation on how to get things setup?

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  • embedded glassfish: java.lang.NoClassDefFoundError: java/util/ServiceLoader

    - by Xinus
    I am trying to embed glassfish inside my java program using embeded api, I am using maven2 and its pom.xml is as follows <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>orh.highmark</groupId> <artifactId>glassfish-test1</artifactId> <version>1.0-SNAPSHOT</version> <packaging>jar</packaging> <name>glassfish-test1</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>org.glassfish.extras</groupId> <artifactId>glassfish-embedded-all</artifactId> <version>3.1-SNAPSHOT</version> </dependency> </dependencies> <repositories> <repository> <id>maven2-repository.dev.java.net</id> <name>Java.net Repository for Maven</name> <url>http://download.java.net/maven/2/</url> <layout>default</layout> </repository> <repository> <id>glassfish-repository</id> <name>GlassFish Nexus Repository</name> <url>http://maven.glassfish.org/content/groups/glassfish</url> </repository> </repositories> <build> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>exec-maven-plugin</artifactId> <version>1.1</version> <executions> <execution> <goals> <goal>java</goal> </goals> </execution> </executions> <configuration> <mainClass>orh.highmark.App</mainClass> <arguments> <argument>argument1</argument> </arguments> </configuration> </plugin> </plugins> </build> </project> Program: public class App { public static void main( String[] args ) { System.out.println( "Hello World!" ); Server.Builder builder = new Server.Builder("test"); builder.logger(true); Server server = builder.build(); } } But for some reason it always gives me error as java.lang.NoClassDefFoundError: java/util/ServiceLoader here is the output C:\Users\sunils\glassfish-tests\glassfish-test1>mvn -e exec:java + Error stacktraces are turned on. [INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [INFO] Building glassfish-test1 [INFO] task-segment: [exec:java] [INFO] ------------------------------------------------------------------------ [INFO] Preparing exec:java [INFO] No goals needed for project - skipping [INFO] [exec:java {execution: default-cli}] Hello World! [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] An exception occured while executing the Java class. null java/util/ServiceLoader [INFO] ------------------------------------------------------------------------ [INFO] Trace org.apache.maven.lifecycle.LifecycleExecutionException: An exception occured whi le executing the Java class. null at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa ultLifecycleExecutor.java:719) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandalone Goal(DefaultLifecycleExecutor.java:569) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(Defau ltLifecycleExecutor.java:539) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHan dleFailures(DefaultLifecycleExecutor.java:387) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegmen ts(DefaultLifecycleExecutor.java:348) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLi fecycleExecutor.java:180) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138) at org.apache.maven.cli.MavenCli.main(MavenCli.java:362) at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:6 0) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) at org.codehaus.classworlds.Launcher.main(Launcher.java:375) Caused by: org.apache.maven.plugin.MojoExecutionException: An exception occured while executing the Java class. null at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:345) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPlugi nManager.java:490) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa ultLifecycleExecutor.java:694) ... 17 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:290) at java.lang.Thread.run(Thread.java:595) Caused by: java.lang.NoClassDefFoundError: java/util/ServiceLoader at org.glassfish.api.embedded.Server.getMain(Server.java:701) at org.glassfish.api.embedded.Server.<init>(Server.java:290) at org.glassfish.api.embedded.Server.<init>(Server.java:75) at org.glassfish.api.embedded.Server$Builder.build(Server.java:185) at org.glassfish.api.embedded.Server$Builder.build(Server.java:167) at orh.highmark.App.main(App.java:14) ... 6 more [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1 second [INFO] Finished at: Sat May 08 02:55:03 IST 2010 [INFO] Final Memory: 3M/6M [INFO] ------------------------------------------------------------------------ I couldn't guess its problem with my program or with the glassfish api. Can somebody please help me understand what is happening here and how to rectify it? thanks for any clue ..

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  • Embedded Linux for total beginner

    - by sasayins
    Hi, I want to learn how to develop in embedded linux. What materials should I need? I don't have the actual embedded device so I plan to use some device emulator for the PC. I want to know how to load the kernel and the filesystem in the device. Many thanks.

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  • recommendation for java VM running on embedded system

    - by pierr
    Hi, We are trying to support Java enviroment on our embedded platform (700MHZ MIPS74K, 128-256M memory).After reading this article and googling a bit, I come up with the shorted list: Sun Java SE for embedded Kaffe Jbed Perc HP Chai VM PhoneME I was quite new to Java and its Runtime enviroment. Your suggestion is greatly appreciated.

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  • Best Embedded SQL DB for write performance?

    - by max.minimus
    Has anybody done any benchmarking/evaluation of the popular open-source embedded SQL DBs for performance, particularly write performance? I've some 1:1 comparisons for sqlite, Firebird Embedded, Derby and HSQLDB (others I am missing?) but no across the board comparisons... Also, I'd be interested in the overall developer experience for any of these (for a Java app).

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  • Use the right tool for the job: embedded programming

    - by EmbeddedProg
    I'm interested in programming languages well suited for embedded programming. In particular: Is it possible to program embedded systems in C++? Or is it better to use pure C? Or is C++ OK only if some features of the language (e.g. RTTI, exceptions and templates) are excluded? What about Java in this domain? Thanks.

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  • Java Spotlight Episode 99: Daniel Blaukopf on JavaFX for Embedded Systems

    - by Roger Brinkley
    Interview with  Daniel Blaukopf on JavaFX for Embedded Systems Right-click or Control-click to download this MP3 file. You can also subscribe to the Java Spotlight Podcast Feed to get the latest podcast automatically. If you use iTunes you can open iTunes and subscribe with this link:  Java Spotlight Podcast in iTunes. Show Notes News Top 5 Reasons to go to JavaOne 5. Chance to see the future of Java Technical Keynotes and sessions The pavillion The new Embedded@JavaOne conference 4. The meetings outside the scope of the conference Top 10 Reasons to Attend the Oracle Appreciation Event GlassFish Community Event at JavaOne 2012 Sundays User Group Forum 3. It’s like drinking from firehose Less keynotes more sessions - 20% more 60% of the talks are external to HOLs Tutorials OracleJava University classes on Sunday - Top Five Reasons You Should Attend Java University at JavaOne 2. Students are free 1. It’s not what you see it’s who you will meet Events Sep 10-15, IMTS 2012 Conference,  Chicago Sep 12,  The Coming M2M Revolution: Critical Issues for End-to-End Software and Systems Development,  Webinar Sep 30-Oct 4, JavaONE, San Francisco Oct 3-4, Java Embedded @ JavaONE, San Francisco Oct 15-17, JAX London Oct 30-Nov 1, Arm TechCon, Santa Clara Oct 22-23, Freescale Technology Forum - Japan, Tokyo Oct 31, JFall, Netherlands Nov 2-3, JMagreb, Morocco Nov 13-17, Devoxx, Belgium Feature InterviewDaniel Blaukopf is the Embedded Java Client Architect at Oracle, working on JavaFX. Daniel's focus in his 14 years in the Java organization has been mobile and embedded devices, including working with device manufacturers to port and tune all levels of the Java stack to their hardware and software environments. Daniel's particular interests are: graphics, performance optimization and functional programming.

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  • TechDays 2011: un parcours dédié à Windows Embedded pour les développeurs et des démonstrations d'appareils « intelligents »

    TechDays 2011: un parcours dédié à Windows Embedded Avec des sessions développeurs et des démonstrations d'appareils « intelligents » Les TechDays 2011 vont être l'occasion de découvrir « in situ » de nombreuses technologies de Microsoft (mais pas seulement, lire par ailleurs notre dossier sur les TechDays 2011). Parmi elles, figure évidemment son nouveau système d'exploitation embarqué fondé sur Windows 7, Windows Embedded 7. Plusieurs sessions traiterons en effet des nouveautés de l'OS et de ses applications possibles. Citons par exemple « Silverlight for Windows Embedded à travers l'exemple de la H...

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  • Windows Embedded Compact 7

    - by Valter Minute
    I’m back from Seattle where I attended the MVP Summit and presented the Windows Embedded Compact 7 training materials during the Train The Trainer in Bellevue (many thanks to all the people attending and providing great suggestions to improve the materials!). The MVP summit was a great chance to discover new things about all the different technologies, to see old friends and meet new ones. The TTT location (Microsoft training facilities at Lincoln square in Bellevue) was great and here’s the landscape that the attendees could enjoy (partially ruined by my presence in the foreground!). In the meantime Windows Embedded Compact 7 has been released: http://www.microsoft.com/windowsembedded/en-us/evaluate/windows-embedded-compact-7.aspx You can download an evaluation version and start to discover its new features (SMP support, support for 3GBs of RAM, Silverlight for Windows Embedded tools, ARM v5,v6 and v7 compilers and many more…) and, maybe, decide to attend a training about it.

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  • can a guy with embedded system background go into game development

    - by NANDAGOPAL
    Well, I finished my Masters in Embedded Systems, and I am working in GUI development, and working with graphic tools and images and GUI's keep me glued to my seat more than working on code for MUP/MUC . And I want to give game development a Fair chance, try out developing a game from scratch using basic libraries then tryout the same in a free/open source game engine and there is a good chance I may fall in love with it, but it is poissible for a person with an Electrical and Electronics Bachelors and Embedded Systems Masters ( just a years experience in the field) go into game development and be successful in the profession. And I asked the same question @ stackoverflow.com (wrong place to ask ) http://stackoverflow.com/questions/13794822/can-a-guy-with-embedded-system-background-go-into-game-development/13794943#13794943 And I received good but a very generic answer. I would be happy to know the actual pro's and con's of a master's in embedded systems migrating to Game Dev And I am extremely sorry for asking the same question for the third time but I really did not know that stackoverflow had so many sister sites, So a really big sorry, and an even bigger thank you!

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  • Windows Embedded Compact 7 Online Training

    - by Valter Minute
    If you want to increase your knowledge about Windows Embedded Compact and want to hear my voice, you can go to the brand new Windows Embedded Compact 7 Online Training website and check all the videos (many of them recorded by me, so be prepared for a funny accent!) showing many of the features and tools of this real time embedded OS from Microsoft. So, buy the pop-corn, sit on your most confortable chair and enjoy the show!

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  • At the Java DEMOgrounds - Oracle’s Java Embedded Suite 7.0

    - by Janice J. Heiss
    The Java Embedded Suite 7.0, a new, packaged offering that facilitates the creation of  applications across a wide range of  embedded systems including network appliances, healthcare devices, home gateways, and routers was demonstrated by Oleg Kostukovsky of  Oracle’s Java Embedded Global Business Unit. He presented a device-to-cloud application that relied upon a scan station connected to Java Demos throughout JavaOne. This application allows an NFC tag distributed on a handout given to attendees to be scanned to gather various kinds of data. “A raffle allows attendees to check in at six unique demos and qualify for a prize,” explained Kostukovsky. “At the same time, we are collecting data both from NFC tags and sensors. We have a sensor attached to the back of the skin page that collects temperature, humidity, light intensity, and motion data at each pod. So, all of this data is collected using an application running on a small device behind the scan station."“Analytics are performed on the network using Java Embedded Suite and technology from Oracle partners, SeeControl, Hitachi, and Globalscale,” Kostukovsky said. Next, he showed me a data visualization web site showing sensory, environmental, and scan data that is collected on the device and pushed into the cloud. The Oracle product that enabled all of this, Java Embedded Suite 7.0, was announced in late September. “You can see all kinds of data coming from the stations in real-time -- temperature, power consumption, light intensity and humidity,” explained Kostukovsky. “We can identify trends and look at sensory data and see all the trends of all the components. It uses a Java application written by a partner, SeeControl. So we are using a Java app server and web server and a database.” The Market for Java Embedded Suite 7.0 “It's mainly geared to mission-to-mission applications because the overall architecture applies across multiple industries – telematics, transportation, industrial automation, smart metering, etc. This architecture is one in which the network connects to sensory devices and then pre-analyzes the data from these devices, after which it pushes the data to the cloud for processing and visualization. So we are targeting all those industries with those combined solutions. There is a strong interest from Telcos, from carriers, who are now moving more and more to the space of providing full services for their interim applications. They are looking to deploy solutions that will provide a full service to those who are building M-to-M applications.”

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  • Telnet or SSH to Embedded Linux based NAS?

    - by ef2011
    Do you happen to know whether it is possible to telnet or SSH to LG N1A1DD1 NAS? It seems to have lots of features that I don't need (including FTP) but I couldn't find any mention of the ability to telnet or SSH to it. If telneting or SSH-ing to it isn't possible, do you know whether it is possible to configure via its web interface a script that can periodically back it up via its USB port? (while still functioning as NAS, of course)

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  • Windows Embedded in Padua

    - by Valter Minute
    Martedì 8 Giugno, presso l’università di Padova terrò un intervento su Windows CE all’interno dell’evento: “Workshop sulle nuove architetture per sistemi embedded”. All’interno dello stesso evento altre sessioni tratteranno dell’architettura ARM e in particolare dei nuovi core Cortex A8, di applicazioni avanzate e di Linux Embedded. L’agenda (fitta e interessante) e il link per le iscrizioni potete trovarli qui: http://www.arrowitaly.it/training-events/training-events/dettaglio-training/article/workshop-sulle-nuove-architetture-per-sistemi-embedded/?tx_ttnews[backPid]=1336&cHash=ae34e269e1

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  • JavaOne - Java SE Embedded Booth - Servergy Micro Server

    - by David Clack
    Hi All,  So it's been awhile, I've been working with all the ARM and Power Architecture partners we have now on testing Java SE Embedded. We will have a Java SE Embedded for ARM and PPC at Java One next week, I'll be bringing in some of the great ARM and PPC systems to demonstrate.  The first system I'd like to tell you about is a really cool 8 core Power Architecture Micro Server from a company in Dallas called Servergy. Java One will be it's first public outing, Bill Mapp the CEO will be doing a talk at the Java Embedded @ JavaOne conference in the Hotel Nikko, right next door to the JavaOne show in the Hilton. To read more about Servergy https://www.linux.com/news/enterprise/cloud-computing/641488-linux-based-servergy-advances-data-center-efficiency http://www.servergy.com/ If you are registered at JavaOne you can come over to the Java Embedded @ JavaOne for $100 Come see us in booth 5605 See you there Dave

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  • APress Deal of the Day 26/Jul/2013 - Pro Windows Embedded Compact 7

    - by TATWORTH
    Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2013/07/26/apress-deal-of-the-day-26jul2013---pro-windows-embedded.aspxToday's $10 deal of the day from APress at http://www.apress.com/9781430241799 is Pro Windows Embedded Compact 7"This book is the natural choice for developers who want to create sophisticated small-footprint devices for both consumer and enterprise use. After significant upgrades from Microsoft, Windows Embedded Compact 7 is more powerful than ever, as you'll discover in this carefully focused deep-dive."

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  • Embedded Spark 2010 Summer Challenge

    - by Valter Minute
    If you have a good idea for a cool embedded device based on Windows Embedded 7 and some free time to work on it you can partecipate to the Embedded Spark 2010 Summer Challenge. Just submit a short paper describing your idea and, if your idea is one of the 75 selected by the judges, you’ll receive some hardware to put your idea in practice and a chance to attend ESC Boston for free and win 15.000 dollars. The latest challenge has been won by Marco Bodoira, a fellow Italian embedded developer, so I hope to see many Italian developers (and non developers) presenting their ideas and project for this new challenge! You can find rules, ideas, forums and all the information you need at the challenge web site: http://www.embeddedspark.com/

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  • RPi and Java Embedded GPIO: Big Data and Java Technology

    - by hinkmond
    Java Embedded and Big Data go hand-in-hand, especially as demonstrated by prototyping on a Raspberry Pi to show how well the Java Embedded platform can perform on a small embedded device which then becomes the proof-of-concept for industrial controllers, medical equipment, networking gear or any type of sensor-connected device generating large amounts of data. The key is a fast and reliable way to access that data using Java technology. In the previous blog posts you've seen the integration of a static electricity sensor and the Raspberry Pi through the GPIO port, then accessing that data through Java Embedded code. It's important to point out how this works and why it works well with Java code. First, the version of Linux (Debian Wheezy/Raspian) that is found on the RPi has a very convenient way to access the GPIO ports through the use of Linux OS managed file handles. This is key in avoiding terrible and complex coding using register manipulation in C code, or having to program in a less elegant and clumsy procedural scripting language such as python. Instead, using Java Embedded, allows a fast way to access those GPIO ports through those same Linux file handles. Java already has a very easy to program way to access file handles with a high degree of performance that matches direct access of those file handles with the Linux OS. Using the Java API java.io.FileWriter lets us open the same file handles that the Linux OS has for accessing the GPIO ports. Then, by first resetting the ports using the unexport and export file handles, we can initialize them for easy use in a Java app. // Open file handles to GPIO port unexport and export controls FileWriter unexportFile = new FileWriter("/sys/class/gpio/unexport"); FileWriter exportFile = new FileWriter("/sys/class/gpio/export"); ... // Reset the port unexportFile.write(gpioChannel); unexportFile.flush(); // Set the port for use exportFile.write(gpioChannel); exportFile.flush(); Then, another set of file handles can be used by the Java app to control the direction of the GPIO port by writing either "in" or "out" to the direction file handle. // Open file handle to input/output direction control of port FileWriter directionFile = new FileWriter("/sys/class/gpio/gpio" + gpioChannel + "/direction"); // Set port for input directionFile.write("in"); // Or, use "out" for output directionFile.flush(); And, finally, a RandomAccessFile handle can be used with a high degree of performance on par with native C code (only milliseconds to read in data and write out data) with low overhead (unlike python) to manipulate the data going in and out on the GPIO port, while the object-oriented nature of Java programming allows for an easy way to construct complex analytic software around that data access functionality to the external world. RandomAccessFile[] raf = new RandomAccessFile[GpioChannels.length]; ... // Reset file seek pointer to read latest value of GPIO port raf[channum].seek(0); raf[channum].read(inBytes); inLine = new String(inBytes); It's Big Data from sensors and industrial/medical/networking equipment meeting complex analytical software on a small constraint device (like a Linux/ARM RPi) where Java Embedded allows you to shine as an Embedded Device Software Designer. Hinkmond

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