AN2120: Connecting an M68HC08 Family Microcontroller to an ...

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Application Note The benefits are endless. Imagine the ability to add new product features remotely, perform device management and remote diagnostics, integrate an interactive and intuitive browser interface to the electronic device, and using that interface all over the world. As these consumer requirements evolve, the integration of the Internet-enabling technology into new and existing electronic devices will become more of a reality. Unfortunately, for most electronic devices, implementing the technology to achieve this networking connectivity based on open Internet standards isn’t easy. For instance, most household appliances are based on very low-cost 8-bit microcontroller technology, and chances are that the host MCU includes neither a network port nor the hardware resources to support TCP/IP (transmission control protocol/Internet protocol) and other Internet protocols without disrupting their primary function. Implementing an entire Internet communications stack requires significant memory and processing resources from the microcontrollerbased system. In most cases, adding those resources to the system surpasses the cost and viability of the main reason why the system was conceived. However, different techniques to Web-enable devices have come to life recently: from implementations of limited TCP/IP functionality in resource constrained systems, to single-chip stacks, to device object servers. Each method has its own advantages and disadvantages. The intention of this application note is to show that a small, resourceconstrained microcontroller can be connected to the Internet when the appropriate resources and well-suited CPU (central processor unit) architecture, such as the one of the M68HC08 Family of MCUs, are put in place. AN2120 2 MOTOROLA
Internet Primer AN2120 M68HC08 FAMILY MCU-BASED SYSTEM (1) ESTABLISH A PPP LINK (2) PPP/UDP/IPMESSAGES IP/ICMP PING REQUESTS AND RESPONSES INTERNET Figure 1. Application Note Framework Application Note Internet Primer OTHER HOSTS ON THE INTERNET The Internet can be seen as a network of several internetworks (or networks of networks) operating over a mechanism used to connect them together. This mechanism relies on the Internet protocol, often referred as the IP protocol. To understand how this Internet platform operates, first consider how a local area network or LAN works. A LAN is basically a group of electronic devices (or hosts) in relative physical proximity connected to each other over a shared medium. A host is essentially anything on the network that is capable of receiving and transmitting information packets on the network. Regardless of the technology used for networking, all hosts share a common physical medium. On top of this medium, a commonly accepted protocol allows all hosts in the LAN to send and receive information to each other. MOTOROLA 3 UDP/IP INTERNET SERVICE PROVIDER (ISP) UDP/IP DATAGRAMS UDP/IP
Page 1: © Motorola, Inc., 2001 Semiconduct
Page 5 and 6: AN2120 A1 A2 A3 NETWORK A B1 B2 B3
Page 7 and 8: AN2120 OSI REFERENCE MODEL INTERNET
Page 9 and 10: AN2120 Application Note Internet Pr
Page 11 and 12: UDP Protocol AN2120 Application Not
Page 13 and 14: AN2120 Application Note Internet Co
Page 15 and 16: Dialing an Internet Service Provide
Page 17 and 18: Start Flag 0x7F PPP Framing AN2120
Page 19 and 20: AN2120 Application Note PPP Framing
Page 21 and 22: AN2120 Field Type A description of
Page 23 and 24: Internet Protocol Control Protocol
Page 25 and 26: AN2120 (1) First LCP packet sent by
Page 27 and 28: AN2120 Application Note Serial Line
Page 29 and 30: Software Operation AN2120 Applicati
Page 31 and 32: AN2120 Table 4. MC68HC908GP32 Inter
Page 33 and 34: Overview of the Modem Interface AN2
Page 35 and 36: AN2120 Application Note Operation o
Page 37 and 38: AN2120 FIFO INITIALIZED FIFO AT RUN
Page 39 and 40: PPP Module AN2120 InBuffer [0] InBu
Page 41 and 42: Listing 4. Body of PPPEntry Functio
Page 43 and 44: AN2120 Application Note Internet Pr
Page 45 and 46: AN2120 Application Note Summary Int
Page 47 and 48: Code Implementation AN2120 Applicat
Page 49 and 50: CommEventProc (ProcPPPReceive); //
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Parameters : Date : July 2000 Desc
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} AN2120 } else { } Application Not
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} AN2120 } case ICMP: IcmpHandler (
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***********************************
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} AN2120 } else { } PPPStatus &= ~I
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AN2120 switch (InBuffer [4] ) { App
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} AN2120 //////////////////////////
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} AN2120 } break; case REJ: break;
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This will force the server to reply
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#include "CommDrv.h" #include "Mode
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} AN2120 } return False; /*********
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} AN2120 } Data+=2; Sum = (Sum >> 1
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} AN2120 Checksum = IPCheckSum (&ud
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*/ #include "IP.h" #include "ICMP.h
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PLL.C Code of InitPLL Function /*//
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BUSFREQ: EQU 2 _1msDelay: PSHA ;2 c
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Current Revision : 0.0 Notes : Defi
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#define ESC_ESC 0xDD //335 octal ex
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void IPBindAdapter (INTERFACE Inter
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Delay.h Header Definitions for Dela
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WORD CommPort (void) { return Port;
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CommDrv.H Serial Communications Int
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AN2120 Application Note Code Implem
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