Programming Embedded Systems in C and C++

13

Chapter 2

In this chapter:

• Hello, World!

• Das Blinkenlights

• The Role of the

Infinite Loop

2

2. Your First

Embedded Program

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 exam-

ple. 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 con-

tains 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 exam-

ple—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 pro-

gramming environment at hand. In that sense, “Hello, World!” serves as a useful

benchmark of programming languages and computer ...