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This project aims to develop an Ethernet Module, to be used in conjunction with a 8/16 bits embedded system such as the dsPic33F development board.  
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==Introduction==
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*This project aims to develop an Ethernet Module, to be used in conjunction with a 8/16 bits embedded system such as [http://opencircuits.com/DsPIC30F_5011_Development_Board the dsPic33F development board].
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*The entire Ethernet Module consists of:
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#Hardware: a LAN card based on [http://www.davicom.com.tw/eng/index.htm Davicom] DM9000A chip
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#Software: a TCP/IP stack based on [http://www.sics.se/~adam/uip/ uIP] 1.0
  
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==Objectives==
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===Useful Links===
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The Internet provides an indispensable means to exchange information over long distances. Connection to the Internet is enabled by following the implementation of the Open Systems Interconnection Reference Model (OSI model). In simple words, internet applications require a TCP/IP stack to pack and unpack information into data packets for proper transmission and reception over the Internet. The TCP/IP stack is usually implemented by software and included in the Operating System. Applications can use the stack transparently through socket programming.
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====DM9000A====
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*[http://www.davicom.com.tw/eng/products/dm9000a.htm DM9000A Description]
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*[http://www.davicom.com.tw/big5/download/Data%20Sheet/DM9000A-DS-F01-101906.pdf DM9000A Datasheet]
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*[http://www.davicom.com.tw/big5/download/AC/dm9000a/DM9000A%20circuit_EMI_052306.pdf Application Circuit]
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*[http://www.davicom.com.tw/big5/download/LayoutGuide/DM9000A_9010-LG-V11_031706.pdf Layout Guidelines]
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*[http://www.davicom.com.tw/big5/download/ApplicationNote/DM9000A%20Application%20Notes%20Ver%201_20_101906.pdf Application Note]
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*[http://www.davicom.com.tw/eng/download/Driver/driver_9000.htm DM9000A Official Drivers]
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====uIP====
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*[http://www.sics.se/~adam/uip/index.php/Main_Page uIP Description]
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*[http://www.sics.se/~adam/uip/index.php/Documentation uIP Documentation]
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*[http://www.sics.se/~adam/uip/index.php/Download Download]
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*[http://sourceforge.net/cvs/?group_id=186227 CVS Repository]
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====lwIP====
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*[http://savannah.nongnu.org/projects/lwip/ lwIP Description]
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*[http://www.nongnu.org/lwip/ Documentation]
  
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Since a full-scale TCP/IP stack consumes a large amount of memory and processing power, a number of small footprint TCP/IP stacks have been devised for embedded systems, such as uIP and lwIP. Nevertheless, these TCP/IP stacks are usually not compatible to socket programming, and being implemented by software, still consumes a considerable amount of system resources. Therefore, hardware chips that implemented the TCP/IP stack (e.g. [http://www.wiznet.co.kr/en/pro02.php?&page=1&num=26 WIZNET W5300]) emerged in recent years so as to offload the computation power from the host microcontroller unit (MCU).
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====HTML====
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*[http://www.w3schools.com/default.asp W3 Schools]: Learning how to write HTML and JavaScript
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*[http://www.nvu.com/index.php Nvu]: Open source HTML Editor
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====SNMP====
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*[http://www.snmplink.org SNMP Link]: Information on SNMP Agents
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*[http://pen.iana.org/pen/PenApplication.page IANA]: Applying a Private Enterprise Number
  
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This project aims to devise a driver and Linux socket wrapper inside freertos_posix for a hardware implemented TCP/IP stack. It is to be used in conjunction with a 8/16 bits embedded system such as (but not restricted to) the [[DsPIC30F_5011_Development_Board | dsPic33F development board]]. Based on the Linux socket API, common application protocols (DHCP/HTTP/DNS/SMTP/SNMP/TELNET) are devised to enable remote control and monitoring.
 
  
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===Benefits===
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==Hardware==
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*Provide a means to perform remote control and monitoring via Internet
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===Component List===
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*Offload TCP/IP stack to chip, freeing memory and processing power of MCU to perform other tasks (e.g. HTTPS)
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{|border="1" cellspacing="0" cellpadding="5"
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*Socket API implementation allows more extensible framework for future development and upgrades
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! Special Item !! Description !! Quantity
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*Enable remote control and monitoring via
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|-valign="top"
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**Web browser on desktop computer (better web page design and implementation)
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| [http://www.davicom.com.tw/big5/download/Data%20Sheet/DM9000A-DS-F01-101906.pdf DM9000AEP] || Ethernet Controller || 1
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**SNMP agents, controlling and monitoring several instruments simultaneously
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|-
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**TELNET applications for command prompt control and monitoring
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| [http://www.hanrun.com/hr/upfile/2_1_113.pdf HR911102A] || RJ45 Connector with Integrated Magnetics for 10/100 Base-TX  || 1
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**SMTP by sending out email when critical events occur
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|-
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| [http://ww1.microchip.com/downloads/en/DeviceDoc/21749F.pdf 93LC46B-I/SN] || 1K Serial EEPROM  || 1 (Optional)
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|-
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| 25MHz Crystal || Crystal || 1
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|-
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| 22pF || For Crystal Use || 2
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|-
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| 220uF || For RXVDD25/TXVDD25  || 1
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|-
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| 49.9ohm || For RX+/RX-/TX+/TX- || 4
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|-
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| 6.8kohm || For BGRES/BGGND || 1
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|-
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| 510ohm || For LEDs|| 2
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|-
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|}
  
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===Limitations===
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===Circuit and PCB===
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*Higher cost chips compare to software stack
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in [http://chungyan5.no-ip.org/vc/?root=ethernet gEDA format]
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*Need to change hardware if features in stack are updated
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and its gEDA [http://www.opencircuits.com/PCB_Footprints#gEDA_Symbols_and_footprints sym and footprints]
  
  
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==Development==
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==Software Driver==
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*[[Ethernet Module Development]]
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*Download [http://chungyan5.no-ip.org/vc/tags/1.09.03/demo_posix/dspic/drivers/dm9000a.c?root=freertos_posix&view=markup here]
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*Base on [http://www.freertos.org/ FreeRTOS] and [http://opencircuits.com/DsPIC30F_5011_Development_Board dsPIC33 platform]
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*Using POSIX-like API:
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**'''int dmfe_open(int flags)''': initialize the Ethernet controller for 10MHz Half-Duplex
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**'''int dmfe_close()''': turn off the PHY layer
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**'''int dmfe_read(void)''': copy a packet to the default buffer
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**'''int dmfe_write(unsigned char device, unsigned char *buf, int count)''': copy count bytes of the data from buf and transmit
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**'''void dmfe_interrupt(void)''': process the transmit interrupt from DM9000A
  
  
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==User Guide==
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==TCP/IP Stack==
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*[[Ethernet Module User's Guide]]
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*uIP and lwIP are light weight TCP/IP Stack designed for 8-bit/16-bit embedded systems.
  
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[[category:projects]]
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===uIP===
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*Develped by Adam Dunkels of the Networked Embedded Systems group at the Swedish Institute of Computer Science.
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*uIP is under the [http://www.sics.se/~adam/uip/index.php/License BSD-style license]
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===lwIP===
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*lwIP is a small independent implementation of uIP.
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*It is more powerful than uIP but requires more memory.
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*lwIP is under the [http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5 Modified BSD License]
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==Ethernet Application==
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===DHCP Client===
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*To be added.
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===Web Server===
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*To be added.
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==SNMP Agent==
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*Simple Network Management Protocol (SNMP) is a standard protocol to access variables to remote device via the Internet.
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*It belongs to the Application Layer, as in HTTP.
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*If a device is SNMP compatible, any SNMP compatible host system can monitor and control that device.
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===Components in a SNMP System===
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*Network Management Station (NMS)
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**This is a client, initiating SNMP communication.
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**This can be a PC with an NMS software, polling data from the SNMP agents periodically.
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*SNMP Agents
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**These are servers, responding to one or multiple NMS requests.
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*Management Information Base (MIB)
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**A special collection of variables managed by the SNMP agents.

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