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This book provides a ‘hardware-free’ introduction to embedded software for

people who:

Already know how to write software for ‘desktop’ computer systems.

Are familiar with a C-based language (Java, C++ or C).

Want to learn how C is used in practical embedded systems.

The remainder of this preface attempts to answer some questions which prospec-

tive readers may have about the contents.

Michael J. Pont is an experienced software engineer who began his first embedded

project in 1986. Since then he has lectured and carried out research at the

University of Sheffield and the University of Leicester, and has provided consul-

tancy and training services to a range of international companies. Michael is the

author of two previous books Patterns for Time-Triggered Embedded Systems and

Software Engineering with C++ and CASE tools.

Preface xi
1 Programming embedded systems in C 1
1.1 Introduction 1
1.2 What is an embedded system? 1
1.3 Which processor should you use? 2
1.4 Which programming language should you use? 7
1.5 Which operating system should you use? 9
1.6 How do you develop embedded software? 12
1.7 Conclusions 15
2 Introducing the 8051 microcontroller family 17
2.1 Introduction 17
2.2 What’s in a name? 17
2.3 The external interface of the Standard 8051 18
2.4 Reset requirements 20
2.5 Clock frequency and performance 21
2.6 Memory issues 23
2.7 I/O pins 29
2.8 Timers 29
2.9 Interrupts 30
2.10 Serial interface 32
2.11 Power consumption 32
2.12 Conclusions 34
3 Hello, embedded world 35
3.1 Introduction 35
3.2 Installing the Keil software and loading the project 36viii Contents
3.3 Configuring the simulator 37
3.4 Building the target 39
3.5 Running the simulation 39
3.6 Dissecting the program 43
3.7 Aside: Building the hardware 55
3.8 Conclusions 56
4 Reading switches 57
4.1 Introduction 57
4.2 Basic techniques for reading from port pins 58
4.3 Example: Reading and writing bytes 60
4.4 Example: Reading and writing bits (simple version) 61
4.5 Example: Reading and writing bits (generic version) 62
4.6 The need for pull-up resistors 67
4.7 Dealing with switch bounce 69
4.8 Example: Reading switch inputs (basic code) 70
4.9 Example: Counting goats 75
4.10 Conclusions 80
5 Adding structure to your code 81
5.1 Introduction 81
5.2 Object-oriented programming with C 82
5.3 The Project Header (MAIN.H) 88
5.4 The Port Header (PORT.H) 94
5.5 Example: Restructuring the ‘Hello Embedded World’ example 96
5.6 Example: Restructuring the goat-counting example 103
5.7 Further examples 111
5.8 Conclusions 111
6 Meeting real-time constraints 113
6.1 Introduction 113
6.2 Creating ‘hardware delays’ using Timer 0 and Timer 1 116
6.3 Example: Generating a precise 50 ms delay 120
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6.4 Example: Creating a portable hardware delay 124
6.5 Why not use Timer 2? 129
6.6 The need for ‘timeout’ mechanisms 129
6.7 Creating loop timeouts 130
6.8 Example: Testing loop timeouts 133
6.9 Example: A more reliable switch interface 134
6.10 Creating hardware timeouts 136
6.11 Example: Testing a hardware timeout 140
6.12 Conclusions 142
7 Creating an embedded operating system 143
7.1 Introduction 143
7.2 The basis of a simple embedded OS 147
7.3 Introducing sEOS 152
7.4 Using Timer 0 or Timer 1 161
7.5 Is this approach portable? 166
7.6 Alternative system architectures 166
7.7 Important design considerations when using sEOS 172
7.8 Example: Milk pasteurization 174
7.9 Conclusions 187
8 Multi-state systems and function sequences 189
8.1 Introduction 189
8.2 Implementing a Multi-State (Timed) system 192
8.3 Example: Traffic light sequencing 192
8.4 Example: Animatronic dinosaur 198
8.5 Implementing a Multi-State (Input/Timed) system 204
8.6 Example: Controller for a washing machine 205
8.7 Conclusions 215
9 Using the serial interface 217
9.1 Introduction 217
9.2 What is RS-232? 217
9.3 Does RS-232 still matter? 218
8322 Prelims (i-xvi) 25/2/02 3:04 pm Page ix9.4 The basic RS-232 protocol 218
9.5 Asynchronous data transmission and baud rates 219
9.6 Flow control 220
9.7 The software architecture 220
9.8 Using the on-chip UART for RS-232 communications 222
9.9 Memory requirements 224
9.10 Example: Displaying elapsed time on a PC 225
9.11 The Serial-Menu architecture 237
9.12 Example: Data acquisition 237
9.13 Example: Remote-control robot 252
9.14 Conclusions 253
10 Case study: Intruder alarm system 255
10.1 Introduction 255
10.2 The software architecture 257
10.3 Key software components used in this example 257
10.4 Running the program 258
10.5 The software 258
10.6 Conclusions 283
11 Where do we go from here 285
11.1 Introduction 285
11.2 Have we achieved our aims? 285
11.3 Suggestions for further study 286
11.4 Patterns for Time-Triggered Embedded Systems 288
11.5 Embedded Operating Systems 288
11.6 Conclusions 289
Index 291
Licensing Agreement 295
x Contents
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