本书是为帮助国内技术人员在第一时间了解国外最新的计算机技术所编写的。该书共分14章，具体内容包括基本调试技巧；中断，芯片内部与外围设备的监控；确定是否存在实时需求以及你的操作系统和应用程序是否能满足这些需求；在实时操作系统和嵌入式Linux中实现任务同步等。该书可供广大嵌入式系统编程爱好者阅读使用。

如果你具有C语言编程经验并且对此较为熟悉，那么《嵌入式系统编程》第二版正是你开始学习编写嵌入式软件的入门指南。《嵌入式系统编程》第一版将这门技术教给了成千上万的开发人员，它已成为嵌入式编程的经典书籍。在第二版中，我们更新了相关内容以涵盖最新的硬件设计和开发方法论。

本书所涉及的技巧和范例代码可直接应用于真实世界里的各种嵌入式软件项目。相关例子用到了免费的GNU软件编程工具、eCos和Linux操作系统以及一种为本书特别定制的低成本硬件平台。若你获得了《嵌入式系统编程》第二版的这些工具，你将拥有一个完整的开发环境以探寻嵌入式系统中的深邃奥秘。即便你使用不同的硬件和软件，本书所提及的原理一样适用。

无论是嵌入式系统新手，还是已在嵌入式系统上做了大量工作的专业人员，你都会从本书讨论的话题中受益，它们包括：基本调试技巧——在小巧的嵌入式系统上工作所需的关键技能；中断，芯片内部与外围设备的监控；确定是否存在实时需求以及你的操作系统和应用程序是否能满足这些需求；在实时操作系统和嵌入式Linux中实现任务同步；优化嵌入式软件的大小、运行速度和能耗。

无论你正在编写第一个嵌入式程序、设计最新潮的手持设备，还是管理一群嵌入式开发工程师，《嵌入式系统编程》第二版都将帮助你提升相关知识和技能，直至你精熟嵌入式软件。

Foreword

Preface

 1. Introduction

What Is an Embedded System?

Variations on a Theme

Embedded Design Examples

Life As an Embedded Software Developer

The C Language: The Lowest Common Denominator

A Few Words About Hardware

 2. Getting to Know the Hardware

Understanding the Big Picture

Hardware Basics

Examine the Landscape

Learn How'to Communicate

Getting to Know the Processor

Study the External Peripherals

Initialize the Hardware

 3. Your First Embedded Program

Hello, World!

The Blinking LED Program

The Role of the Infinite Loop

 4. Compiling, Linking, and Locating

The Build Process

Building the Blinking LED Program

A Quick Look at Makefiles

 5. Downloading and Debugging

Downloading the Blinking LED Program

Remote Debuggers

Emulators

Other Useful Tools

Dig into the Hardware

 6. Memory

Types of Memory

Direct Memory Access

Endian Issues

Memory Testing

Validating Memory Contents

Using Flash Memory

 7. Peripherals

Control and Status Registers

The Device Driver Philosophy

Device Driver Design

 8. Interrupts

Overview

Interrupt Map

Interrupt Service Routine

The Improved Blinking LED Program

Summary of Interrupt Issues

 9. Putting It All Together

Application Overview

Working with Serial Ports

Command-Line Interface Processing

 10. Operating Systems

History and Purpose

The Scheduler

Tasks

Task Synchronization

Message Passing

Other Functionality

Interrupt Handling

Real-Time Characteristics

To Use or Not to Use an RTOS

Additional Resources

 11. eCos Examples

Introduction

Task Mechanics

Mutex Task Synchronization

Semaphore Task Synchronization

Message Passing

eCos Interrupt Handling

 12. Embedded Linux Examples

Introduction

Accessing Hardware in Linux

Task Mechanics

Mutex Task Synchronization

Semaphore Task Synchronization

Message Passing

 13. Extending Functionality

Common Peripherals

Networking for All Devices Great and Small

 14. Optimization Techniques

Increasing Code Efficiency

Decreasing Code Size

Problems with Optimizing Compilers

Reducing Memory Usage

Power-Saving Techniques

Limiting the Impact of C++

 A. The Arcom VIPER-Lite Development Kit

 B. Setting Up Your Software Development Environment

 C. Building the GNU Software Tools

 D. Setting Up the eCos Development Environment

 E. Setting Up the Embedded Linux Development Environment

Index