Fpga-based Embedded Internet. The ¦Ìclinux Development And Research

With the development and application of the Internet, more and more equipments are needed to connect with the network for achieving long-distance control and sharing resources. This dissertation use FPGA and μClinux to achieve embedded network systems. The FPGA and the SPOC teckniques represent the development of modern semiconductor. μClinux is a good embedded operation system. The strong network function, flexibly cutting off functions, configuring function and its robusbility make μClinux being used more and more in embedded systems.Though analysis of the needs of remote control and measuring system based on the Internet and the characteristics of μClinax, the ways to make a embedded Internet system based on FPGA is presented. Remote access use Browser/Server mode. The remote control and measuring objects include a BLDCM and a distributed measuring system. For the problems of time delay, data package loss and sequence confusion, a remote control method based on predictive control is presented.In software part, using FPGA and LAN91C111 to make a network interface is introduced in details, the method of PWM implementation on FPGA, porting μClinux to Nios II softcore processer, the debugging and making drivers and application programs are presented. The hardware of embedded network communication equipment is also discussed in this dissertation, including FPGA system board, the interface circuits of network chip LAN91C111, the hardware design of BLDCM and the distributed measuring system. So a remote control and measurement system is made.The advantages of using FPGA and ,μClinux to embedded network equipments are that it can shorten the development period, improve system integration and flexibly configuration. The disadvantages are that the system need to be more integrated and the real time operation performance is not so good. The improvement of changing the μClinux core to the real-time core is needed.