Ethernet Module Development

This wiki describes the development of Ethernet Module.

Architecture

• See here for block diagram

Development Roadmap

Phase 1

• Select chips and draw schematic and pcb
• Obtain samples for chip

Phase 2

• Device driver
• Create a Linux socket API wrapper in freertos_posix

Phase 3

• Reference to Linux socket/lwip, create libraries for
  • DHCP client
  • HTTP server
    • Decide how to get files (html, css, cgi, etc) from nvm (with/without file system)
    • Decide an efficient means to create and download web page to nvm
  • DNS resolver
  • SMTP mail client
  • SNMP agent
  • TELNET application

Phase 4

• Explore wireless-bridge solutions
  • WIZ610wi
  • XStream OEM RF Module

Software TCP/IP Stack Solution

Circuit and PCB

• In gEDA format and its gEDA sym and footprints

Special Item	Description	Quantity
DM9000AEP	Ethernet Controller from Davicom	1
HR911102A	RJ45 Connector with Integrated Magnetics for 10/100 Base-TX	1
93LC46B-I/SN	1K Serial EEPROM	1 (Optional)
25MHz Crystal	Crystal	1
22pF	For Crystal Use	2
220uF	For RXVDD25/TXVDD25	1
49.9ohm	For RX+/RX-/TX+/TX-	4
6.8kohm	For BGRES/BGGND	1
510ohm	For LEDs	2

• DM9000A Description
• DM9000A Datasheet
• Application Circuit
• Layout Guidelines
• Application Note
• DM9000A Official Drivers

Software Implementation

Driver

• Download dm9000a.c
• Download dm9000a.h
• Base on FreeRTOS and dsPIC33 platform
• Using POSIX-like API:
  • int dmfe_open(int flags): initialize the Ethernet controller for 10MHz Half-Duplex
  • int dmfe_close(): turn off the PHY layer
  • int dmfe_read(void): copy a packet to the default buffer
  • int dmfe_write(unsigned char device, unsigned char *buf, int count): copy count bytes of the data from buf and transmit
  • void dmfe_interrupt(void): process the transmit interrupt from DM9000A

uIP

• Light-weight TCP/IP stack designed for 8-bit/16-bit embedded systems

lwIP

• Light-weight TCP/IP stack designed for 8-bit/16-bit embedded systems
• Consume more resource than uIP

Hardware TCP/IP Stack Solution

Circuit and PCB

• WIZNET W5300