TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 183

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 183', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | failure versions of the 80186 from Intel and AMD have enjoyed tremendous success in embedded systems in recent years. Chapter 2. Your First Embedded Program Hello World Das Blinkenlights The Role of the Infinite Loop ACHTUNG Das machine is nicht fur gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk blowenfusen und corkenpoppen mit spitzensparken. Ist nicht fur gewerken by das dummkopfen. Das rubbernecken sightseeren keepen hands in das pockets. Relaxen und vatch das blinkenlights In this chapter we ll dive right into embedded programming by way of an example. The program we ll look at is similar in spirit to the Hello World example found in the beginning of most other programming books. As we discuss the code I ll provide justification for the selection of the particular program and point out the parts of it that are dependent on the target hardware. This chapter contains only the source code for this first program. We ll discuss how to create the executable and actually run it in the two chapters that follow. Hello World It seems like every programming book ever written begins with the same example a program that prints Hello World on the user s screen. An overused example like this might seem a bit boring. But it does help readers to quickly assess the ease or difficulty with which simple programs can be written in the programming environment at hand. In that sense Hello World serves as a useful benchmark of programming languages and computer platforms. Unfortunately by this measure embedded systems are among the most difficult computer platforms for programmers to work with. In some embedded systems it might even be impossible to implement the Hello World program. And in those systems that are capable of supporting it the printing of text strings is usually more of an endpoint than a beginning. You see the underlying assumption of the Hello World example is that there is some sort of output device on which strings of characters

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