making embedded systems design patterns for great software

... Embedded Design Life Cycle Unlike the design of a software application on a standard platform, the design of an embedded system implies that both software and hardware are being designed in ...  The implications of software failure is much more severe in embedded systems than in desktop systems.  Embedded systems often have power constraints.  Embedded systems often must operate ... environmental conditions.  Embedded systems have far fewer system resources than desktop systems.  Embedded systems often store all their object code in ROM.  Embedded systems require specialized...

Ngày tải lên: 16/08/2012, 09:40

... faculty have only reinforced my belief that we need such a book. What is this book about? This book is not intended to be a text in software design, or even embedded software design (although ... make embedded software development different from host-based software design. In other words, what do you do when there is no printf() or malloc()? Because this is a book about designing embedded ... book about designing embedded systems? Because my experiences working in the industry and, more recently, working with students have convinced me that there is a need for such a book. For example,...

Ngày tải lên: 30/09/2013, 01:20

...  The implications of software failure is much more severe in embedded systems than in desktop systems.  Embedded systems often have power constraints.  Embedded systems often must operate ... environmental conditions.  Embedded systems have far fewer system resources than desktop systems.  Embedded systems often store all their object code in ROM.  Embedded systems require specialized ... for acceptance of their devices in an embedded application. That is, unless their chip had a good solution for embedded system design and debug, it was not going to be a serious contender for...

Ngày tải lên: 30/09/2013, 01:20

... Web service from scratch. WHAT ARE DESIGN PATTERNS? Design patterns are loosely described as time-tested, established solutions to recurring design problems. Formal design patterns are highly structured ... substitute for embedded type information. CHAPTER 3 ■ DESIGN PATTERNS FOR BUILDING MESSAGE-ORIENTED WEB SERVICES 51 701xCH03.qxd 7/17/06 12:54 PM Page 51 Step 2: Build the XSD Schema File for the ... design patterns because they factor in industry-accepted practices for approaching recurring design problems. CHAPTER 3 ■ DESIGN PATTERNS FOR BUILDING MESSAGE-ORIENTED WEB SERVICES 33 701xCH03.qxd 7/17/06...

Ngày tải lên: 05/10/2013, 08:48

... " + q.Previous_Close.ToString()); For more information on building loosely coupled clients, please refer to Chapter 3. CHAPTER 4 ■ DESIGN PATTERNS FOR BUILDING SERVICE-ORIENTED WEB SERVICES ... file (defined in a separate, though embedded, class file). This approach is incorrect from an SOA perspective for two reasons: CHAPTER 4 ■ DESIGN PATTERNS FOR BUILDING SERVICE-ORIENTED WEB SERVICES ... site at http://www.apress.com) for full code listings. Figure 4-5. Client console application for the StockTraderContracts Web service CHAPTER 4 ■ DESIGN PATTERNS FOR BUILDING SERVICE-ORIENTED...

Ngày tải lên: 05/10/2013, 08:48

... abstrac- tion of a port. HTTP is designed for Request/Response messaging patterns, meaning that a request generates a direct response. TCP is designed for decoupled messaging patterns whereby a sender ... path. EndPointReference Stores endpoint reference information, which is binding information for a service. Continued 3901c09_final.qxd 6/30/04 3:19 PM Page 222 Design Patterns for SOAP Messaging with WS-Addressing ... MSMQ for Reliable Messaging Consider the following application design for a StockTrader application for mutual fund trades, which cannot be executed until after the stock exchange closes for the...

Ngày tải lên: 05/10/2013, 08:51

... Embedded Design Life Cycle Unlike the design of a software application on a standard platform, the design of an embedded system implies that both software and hardware are being designed in ... a different design strategy for partitioning the design into hardware and software components. The partitioning decision is a complex optimization problem. Many embedded system designs are ... the other issues. Work Cited 1. Barr, Michael. “Architecting Embedded Systems for Add-on Software Modules.” Embedded Systems Programming, September 1999, 49. TEAMFLY ...

Ngày tải lên: 13/12/2013, 11:15

... will as well but this is a book about embedded systems, not about design patterns. Think about exploring one of these to learn more about standard software patterns. • Gamma, Erich; Richard Helm, ... Sierra (2004), Head First Design Patterns. Using Java as the example language, this book gives great exam- ples with an engaging style. • Search on Wikipedia for software design pattern. Interview ... Ralph Johnson, and John Vlissides (1995), Design Patterns: Elements of Reusable Object-Oriented Software. This is the original, semi- nal work on design patterns. It uses C++ as the reference language. •...

Ngày tải lên: 15/03/2014, 20:20

... then on how to go about designing and implementing software for an embedded system. This book contains some of what I've learned. It is a book about good software design in resource constrained ... will as well but this is a book about embedded systems, not about design patterns. Think about exploring one of these to learn more about standard software patterns. • Gamma, Erich; Richard Helm, ... Sierra (2004), Head First Design Patterns. Using Java as the example language, this book gives great exam- ples with an engaging style. • Search on Wikipedia for software design pattern. Interview...

Ngày tải lên: 16/03/2014, 00:20

... at www.dummies.com/go/designpatternsfd1e. 4 Design Patterns For Dummies 03_798541 intro.qxp 3/27/06 2:20 PM Page 4 Still unclear about when to use the GoF Factory Method design pattern? Consider ... to the design pattern for this chapter, which this chapter’s whole discussion has really been about — the Strategy design pattern. Making Your Move with the Strategy Pattern The Strategy design ... standard patterns, you also see some newer patterns that have been added to the standard set of patterns, bringing us up to the modern day. Chapter 12 is all about joining the worldwide patterns...

Ngày tải lên: 25/03/2014, 15:23

... Decorator and Factory Patterns 07_798541 ch03.qxp 3/27/06 2:21 PM Page 51 Design Patterns For Dummies xviii 02_798541 ftoc.qxp 3/27/06 2:20 PM Page xviii Closed for Modification, Open for Extension One ... and the Formula One racer this way: public static void main(String[] args) { StreetRacer streetRacer = new StreetRacer(); FormulaOne formulaOne = new FormulaOne(); streetRacer.go(); formulaOne.go(); . . . } 24 Part ... which is why design patterns were introduced in the first place. In particular, design patterns are intended to help you handle change as you have to adapt your code to new and unforeseen circumstances....

Ngày tải lên: 07/04/2014, 15:10

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 22/06/2014, 19:20

... ) and can  boot several operating systems (Linux, uClinux, and others) Softgun: http://softgun.sourceforge.net Virtual ARM system with many virtual on­board peripherals.  Boots Linux. SWARM ­ Software ARM ­ arm7 emulator http://www.cl.cam.ac.uk/~mwd24/phd/swarm.html Can run uClinux 13 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 klibc http://www.kernel.org/pub/linux/libs/klibc/ “Kernel C library” Tiny and minimalistic C library designed for use in an initramfs at  boot time (alternative to initrds). Fine for the creation of simple shell scripts. Ships with small executables for use in shells, built with klibc, and a klcc compiler to compile your own applications. Not elaborate enough to support BusyBox applications. Useful details in  http://en.wikipedia.org/wiki/Klibc 19 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Platform specific toolchains (1) ARM Code Sourcery (supports GNU/Linux, EABI and uClinux): http://www.codesourcery.com/gnu_toolchains/arm/ Also available for Windows workstations. MIPS http://www.linux­mips.org/wiki/Toolchains (useful links) 6 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Training contents (3) Annexes Automatic system generation with BitBake / OpenEmbedded 33 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Other emulators ColdFire emulator http://www.slicer.ca/coldfire/ Can boot uClinux 37 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Minicom (1) Definition: serial communication program Available in all GNU / Linux distributions Capabilities (all through a serial link): Serial console to a remote Unix system File transfer Modem control and dial­up Serial port configuration 50 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Denx Software Engineering http://denx.de Created by Wolfgang Denk, the author of the U­Boot bootloader. Create and support the Embedded Linux Development Kit (ELDK), a complete and well documented development environment. This kit is not only Free Software, it can be downloaded freely by anyone. A great community member and contributor! 15 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Free Software tools for embedded systems GNU / Linux workstation Cross­compiling toolchains 9 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 uClibc http://www.uclibc.org/ from CodePoet Consulting License: LGPL Lightweight C library for small embedded systems,  with most features  though. The whole Debian Woody was ported to it ... Support services Useful if you don't have your  own support resources Long term support commitment,  even for versions considered as  obsolete by the community, but  not by your users! 44 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Commercial toolsets Caution: commercial doesn't mean proprietary! Vendors play fair with the GPL and do make their source code  available to their users, and most of the time, to the community. As long as they distribute the sources to their users, the GPL  doesn't require vendors to share their sources with any third party. No issue with all the GPL sources developed by or with the  community. Graphical toolkits developed by the vendors look proprietary. Their  licenses are not advertised on their websites! You have to be a  customer to know or get a free preview kit to know. 35 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Free Software tools for embedded systems GNU / Linux workstation Various tools 34 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Emulators ­ Summary System emulators Useful to experiment with a full system, including the kernel qemu: x86, x86_64, arm, sparc, ppc, mips SkyEye: several arm architectures User emulators Useful to run or debug user space binaries for other CPUs qemu: x86, arm, sparc, ppc, mips 20 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Platform specific toolchains (2) Coldfire Code Sourcery (supports ELF, GNU/Linux and uClinux): http://www.codesourcery.com/gnu_toolchains/coldfire PowerPC Code Sourcery (supports GNU/Linux and EABI) http://www.codesourcery.com/gnu_toolchains/power.html 49 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Sysgo ­ Koan Software http://sysgo.com ELinOS development toolset, in particular based on Eclipse and the Linux Trace Toolkit. Includes FreeToolBox, a freely  downloadable compiling and rootfs  creating toolchain. Supports i386, arm and ppc. Hard real­time support with their own  microkernel (PikeOS), an approach similar to RTAI. http://koansoftware.com Makers of KaeilOS (http://koansoftware.com/kaeilos/), a GPL  embedded Linux distribution for industrial  applications. KaeilOS supports i386 and popular arm  platforms. Other platforms supported upon  request. Includes several graphical toolkits and  supports hard real­time (RTAI, Xenomai,  preemption patches). Unfortunately, KaeilOS is GPL but not  available for public download. 16 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Standalone toolchain build Building a cross­compiling toolchain by yourself is a difficult and painful task!  Can take days or weeks! Lots of details to learn. Several components to build (building gcc twice: once for gcc + once for compilers that need the C library). Lots of decisions to make (such as C library version and configuration for your platform) Need kernel headers and C library sources Need to be familiar with current gcc issues and patches on your platform Useful to be familiar with building and configuring tools http://www.aleph1.co.uk/armlinux/docs/toolchain/toolchHOWTO.pdf can show you how fun it can be! 21 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Toolchain building utilities Buildroot: http://buildroot.uclibc.org/ Dedicated Makefile to build uClibc based toolchains and even entire root filesystems. Downloads sources and applies patches. Crosstool:  http://www.kegel.com/crosstool/ Dedicated script to build glibc based toolchains Doesn’t support uClibc yet. Downloads sources and applies patches. 26 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Toolchains ­ useful resources eLinux.org toolchain page: http://elinux.org/Tool_Chains 29 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Free Software tools for embedded systems GNU / Linux workstation Emulators 8 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 glibc http://www.gnu.org /software/ libc/ License: LGPL C library from the GNU project Designed for performance, standards compliance and  portability Found on all GNU / Linux host systems Quite big for small embedded systems:  about 1.7 MB on  Familiar Linux iPAQs (libc: 1.2 MB, libm: 500 KB) 36 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 chroot Available in all GNU/Linux distributions Usage: chroot <dir> [command] Runs a command or an interactive shell with a special root directory. Standard usage: Internet servers Services executed in chroot jails: even when compromised, the service cannot gain access to the rest of the system. Usage for embedded system development: Develop and test a new root filesystem on the development host. Very easy to use when the host and target have the same CPU instruction set. Used by LFS (Linux From Scratch). Also used by Scratchbox: Qemu makes the usage of target binaries transparent. / bin lib etc http / lib etc bin chroot jail ... Support services Useful if you don't have your  own support resources Long term support commitment,  even for versions considered as  obsolete by the community, but  not by your users! 44 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Commercial toolsets Caution: commercial doesn't mean proprietary! Vendors play fair with the GPL and do make their source code  available to their users, and most of the time, to the community. As long as they distribute the sources to their users, the GPL  doesn't require vendors to share their sources with any third party. No issue with all the GPL sources developed by or with the  community. Graphical toolkits developed by the vendors look proprietary. Their  licenses are not advertised on their websites! You have to be a  customer to know or get a free preview kit to know. 35 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Free Software tools for embedded systems GNU / Linux workstation Various tools 34 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Emulators ­ Summary System emulators Useful to experiment with a full system, including the kernel qemu: x86, x86_64, arm, sparc, ppc, mips SkyEye: several arm architectures User emulators Useful to run or debug user space binaries for other CPUs qemu: x86, arm, sparc, ppc, mips 20 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Platform specific toolchains (2) Coldfire Code Sourcery (supports ELF, GNU/Linux and uClinux): http://www.codesourcery.com/gnu_toolchains/coldfire PowerPC Code Sourcery (supports GNU/Linux and EABI) http://www.codesourcery.com/gnu_toolchains/power.html 49 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Sysgo ­ Koan Software http://sysgo.com ELinOS development toolset, in particular based on Eclipse and the Linux Trace Toolkit. Includes FreeToolBox, a freely  downloadable compiling and rootfs  creating toolchain. Supports i386, arm and ppc. Hard real­time support with their own  microkernel (PikeOS), an approach similar to RTAI. http://koansoftware.com Makers of KaeilOS (http://koansoftware.com/kaeilos/), a GPL  embedded Linux distribution for industrial  applications. KaeilOS supports i386 and popular arm  platforms. Other platforms supported upon  request. Includes several graphical toolkits and  supports hard real­time (RTAI, Xenomai,  preemption patches). Unfortunately, KaeilOS is GPL but not  available for public download. 16 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Standalone toolchain build Building a cross­compiling toolchain by yourself is a difficult and painful task!  Can take days or weeks! Lots of details to learn. Several components to build (building gcc twice: once for gcc + once for compilers that need the C library). Lots of decisions to make (such as C library version and configuration for your platform) Need kernel headers and C library sources Need to be familiar with current gcc issues and patches on your platform Useful to be familiar with building and configuring tools http://www.aleph1.co.uk/armlinux/docs/toolchain/toolchHOWTO.pdf can show you how fun it can be! 21 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Toolchain building utilities Buildroot: http://buildroot.uclibc.org/ Dedicated Makefile to build uClibc based toolchains and even entire root filesystems. Downloads sources and applies patches. Crosstool:  http://www.kegel.com/crosstool/ Dedicated script to build glibc based toolchains Doesn’t support uClibc yet. Downloads sources and applies patches. 26 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Toolchains ­ useful resources eLinux.org toolchain page: http://elinux.org/Tool_Chains 29 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 Free Software tools for embedded systems GNU / Linux workstation Emulators 8 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 glibc http://www.gnu.org /software/ libc/ License: LGPL C library from the GNU project Designed for performance, standards compliance and  portability Found on all GNU / Linux host systems Quite big for small embedded systems:  about 1.7 MB on  Familiar Linux iPAQs (libc: 1.2 MB, libm: 500 KB) 36 Free Software tools for embedded systems © Copyright 2004­2008, Free Electrons Creative Commons Attribution­ShareAlike 2.5 license http://free­electrons.com Jan 24, 2008 chroot Available in all GNU/Linux distributions Usage: chroot <dir> [command] Runs a command or an interactive shell with a special root directory. Standard usage: Internet servers Services executed in chroot jails: even when compromised, the service cannot gain access to the rest of the system. Usage for embedded system development: Develop and test a new root filesystem on the development host. Very easy to use when the host and target have the same CPU instruction set. Used by LFS (Linux From Scratch). Also used by Scratchbox: Qemu makes the usage of target binaries transparent. / bin lib etc http / lib etc bin chroot jail ...

Ngày tải lên: 20/10/2013, 00:15

Ngày tải lên: 21/06/2014, 05:20

Ngày tải lên: 22/06/2014, 00:20