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THE ETHERNET DEVELOPMENT BOARD

Part 2: The Software and Firmware Exposed
by Fred Eady

Start ý The Basics ý Registers ý Bus Interface Registers ý Status and Control Registers ý InitChip ý Initiate Transmit Registers ý Address Filter Registers ý Receive and Transmit Frame Locations ý CS8900A-CQ Transmit and Receive Operations ý The Next Read ý Broadcast ý ARP ý No Cheating ý Tiger Woodsý Putter ý Whatýs the Point? ý And It Programs, Too! ý Sources and PDF

WHATýS THE POINT?

OK, Iýve gone to all this trouble to show you how you can build the equipment and operate on the Ethernet with a PIC and a handful of various other components. What good is it if you canýt do something with the data that is encapsulated in the Ethernet packets?

Iým sure youýll find a need for Ethernet connectivity in some of your projects, and to help you get started, Iým including a simple Visual Basic (VB) program that sends and receives data using the UDP protocol. You can select the IP address and UDP port and transfer data between the PC and other uniquely addressed Ethernet development boards on a network.

This little program also has a built-in echo function dedicated to UDP Port 7 and a basic IP-address-selectable and UDP-Port-selectable on/off switch mechanism for Port A of the Ethernet development boardýs PIC16F877. For those who wish to play, Iýll include the VB project files. You can get an idea of the functionality of the VB-based test panel by looking at Photo 14.

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