The Design And Realization Of Embedded Ethernet System Based On MSP430 And CS8900A

The Internet is playing a more and more important role in our daily life, and presenting a trend of an accelerated development. Today this is not only the patent of personal computers or workstations, more and more embedded systems controlled by MCU have became a member of network nodes, too. Usually, these kinds of nodes are called embedded network terminals. Try to imagine some applications that are able to control hardware via a standard Internet browser can transmit and visualize the states of sensors , and automatically generate and send E-mails on the occurrence of special events (for example, theft alarm, fire alarm, gas leakiness etc). That will realize remote supervision of home automation, and bring people's life more conveniences.It is necessary to implement a TCP/IP protocol stack to complete communications of embedded Internet. There is usually a real time operating system which contains TCP/IP protocols in the embedded system based on upscale microprocessors of 32 bit, and that makes it quite easy to connect to Internet. But it is hard for the MCU of 8 bit or 16 bit to do so, because their capability of processing and resources are very limited and there is no operating system within them, either. So it is necessary to complete a downsized TCP/IP protocol stack which is quite credible and perfect for conmunications according to the characteristics of these lower level microprocessors by taking or rejecting some of the standard TCP/IP protocols.This thesis describes the design and realization process of the embedded network terminal in detail, including two parts, the hardware and software. The network terminal is based on the MSP430 of Texas Instruments controlling the Ethernet LAN controller CS8900A of the Cirrus Logic Company. The hardware part describes the whole frame of the termainal, the choice of each part and the circuit connection. The software part contains the driver programme of CS8900A, the realization of simple TCP/IP protocols within the microcontroller and the design of the applied functions.This design implements MSP430 controlling CS8900A and the communication in LAN. On the foundation of the downsized TCP/IP protocol stack, some applications are realized which are able to transmit and visualize the state of sensors via a standard Internet browser, and Emails are generated and sent to the appointed mailbox with the information of special events. With the Internet technique being widely used in the electronic products, the successful realization of this design will provide a reference of the application of embedded Internet in the domain of the remote data collecting and remote supervision etc.