Mouse Interfacing with USB and PS/2 - Elektor - ISBN 978-0-905705-74-3

Table of Contents Introduction

7

Part 1

9

PS/2

1.1

The Mouse Hardware Interface Experiment

11 12

1.2

The PS/2 Software Interface Terminology Protocol Sequence Error control mechanisms Protocol timing PS/2 Mouse Command Set

13 13 13 14 15 16

1.3

First words in PS/2: Reset-Acknowledge Program Design Overview Program 1 Critical timing constraints The next step

18 18 20 22 22

1.4

Sequences and state machines Host transmission Host reception Program 2 Ballistic profiles MPLAB Gotchas

25 25 27 28 33 38

1.5

PS/2 as a background task Motivation Mechanisms Program 3

42 42 42 46

1.6

Multi-channel voltage source Instruction manual Hardware Design Software design

51 51 52 54 5

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TABLE OF CONTENTS

Mouse Interfacing with USB and PS/2 - Elektor - ISBN 978-0-905705-74-3

Part 2

USB

2.1

Some background on USB Low Speed Device Identification

61 63

2.2

Hands on the chips What do I need ? Implementing a USB mouse controller using FTDI’s VNC1L ‘Vinculum’ chip Vinculum ‘Gotcha’ You will need Software System Setup

65 65

2.3

Testing the Host Controller Descriptors HID and Report Descriptors

74 78 83

2.4

Using the Host Controller in embedded designs A simple USB mouse driver Accessing Disk Drives Program Description

91 94 102 107

PART 3 Listings

117

PS/2 Programs Program 1 – Reset sequence Program 2 – PS/2 Core Program 3 – Interrupt-driven PS/2 comms. Display mouse Program 3 – position & button state on an LCD Program 4 – Voltage Source Program

119 119 122

USB Programs Program 1 – Usb 1 Program 2 – Usb2

178 178 197

Webliography

253

3.1

3.2

Index

6

L

59

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66 67 68 69 71

129 167