DRM049, Internet Connectivity with HCS12 16-bit Microcontroller using the ACP Reference Design

124 Pages·2012·1.92 MB·English

by  Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.
Internet Connectivity
with HCS12 16-bit
Microcontroller using
the ACP Reference
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MOTOROLA.COM/SEMICONDUCTORS

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For More Information On This Product,
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Freescale Semiconductor, Inc.
Internet Connectivity with
HCS12 16-bit
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, ACP Reference Design
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c Designer Reference Manual — Rev 0
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S by: Dr. Gerald Kupris, Motorola SPS, Munich, Germany.

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Harald Kreidl
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a Motorola SPS

c Munich, Germany

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e Dirk Lill

e Steinbeis-Transfer Centre Embedded Design and Networking

r University of Cooperative Education
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Loerrach, Germany
Prof. Dr.-Ing. Axel Sikora
Steinbeis-Transfer Centre Embedded Design and Networking
University of Cooperative Education
Loerrach, Germany
DRM049 — Rev 0 Designer Reference Manual
MOTOROLA 3

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Designer Reference Manual DRM049 — Rev 0
4 MOTOROLA

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Designer Reference Manual — DRM049
List of Sections
Section 1. emBetter — A Short Overview. . . . . . . . . . . .15
Section 2. Connecting Embedded Applications to the
Internet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
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Section 3. Basics of Implementation. . . . . . . . . . . . . . . .33
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Section 4. Design Techniques for emBetter. . . . . . . . . .43
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o Section 5. Overall Implementation of emBetter . . . . . . .49
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Section 6. Layer Implementation of emBetter . . . . . . . .63
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Section 7. Test environment . . . . . . . . . . . . . . . . . . . . .109
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DRM049 — Rev 0 Designer Reference Manual
MOTOROLA List of Sections 5

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List of Sections
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Designer Reference Manual DRM049 — Rev 0
6 List of Sections MOTOROLA

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Freescale Semiconductor, Inc.
Designer Reference Manual — DRM049
Table of Contents
Section 1. emBetter — A Short Overview
1.1 Protocol Suite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
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1.4 Modularity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
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1.5 Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
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Section 2. Connecting Embedded Applications to the
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2.1 Status and Trends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

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2.3 Internet Connectivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
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s Section 3. Basics of Implementation

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e 3.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

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3.2 Packet Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
3.3 Layered Protocol Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
3.4 Client/Server Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
3.5 Ports and Sockets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Section 4. Design Techniques for emBetter
4.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
DRM049 — Rev 0 Designer Reference Manual
MOTOROLA Table of Contents 7

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Table of Contents
4.2 Zero-copy Approach. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
4.3 Unified Protocol Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
4.4 Socket Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
4.5 Callback Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
4.6 Blocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Section 5. Overall Implementation of emBetter
. 5.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
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5.2 Structure and Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
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5.3 Exception Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
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5.4 Buffer Handling and Data Flow. . . . . . . . . . . . . . . . . . . . . . . . .56
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6.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

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6.2 Modem Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
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6.3 The Point to Point Protocol (PPP) . . . . . . . . . . . . . . . . . . . . . .72
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6.4 The Internet Protocol (IP). . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

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6.6 Socket Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

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6.7 Hypertext Transfer Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . .96
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6.9 Simple Mail Transfer Protocol. . . . . . . . . . . . . . . . . . . . . . . . .102
6.10 UDP Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
Section 7. Test environment
7.1 Alarm Control Panel Reference Design . . . . . . . . . . . . . . . . .109
7.2 Setup of the Demonstration and Development Environment .109
Designer Reference Manual DRM049 — Rev 0
8 Table of Contents MOTOROLA

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Table of Contents
7.3 Simulation environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112
Section 8. Sources
8.1 Web Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
8.2 Literature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120
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DRM049 — Rev 0 Designer Reference Manual
MOTOROLA Table of Contents 9

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Table of Contents
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Designer Reference Manual DRM049 — Rev 0
10 Table of Contents MOTOROLA

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