The Design Of The Gateway Between Ethernet And CAN-Bus Based On Embedded System

With the development of information and network technology, the embedded system is used widely in all kinds of fields. In the field of industrial control, the phenomena will be replaced, which is the stronger independence of the individual equipment and the weaker dependence between the equipments. More and more attention is paid on the effective of equipment, coordinated work among equipments, long-distance transmission and remote supervisory.As an outstanding field bus, CAN bus has more advantages. It can not only be used in motorcar industry, but also process control, textile machinery, farm machinery, automaton, medical apparatus and instruments, transducer, and so on. More and more industry equipments adopt CAN bus to make up the distributed control system. Ethernet has been widely used in business field. It can be facilityly transmit and communication. Ethernet based on TCP/IP begins to enter the industry equipment field besides its popularization on PC. The equipment accessing to Ethernet will greatly improve the distributed characteristic of the control system. The interconnection between CAN bus and Ethernet is discussed.The article has studied the protocol transition gateway between CAN bus and Ethernet based on Linux operating system. Taking Linux as the software platform and ARM as the hardware platform, and by the design of the software and hardware, it realized the protocol transition between CAN protocol and Ethernet protocol. And it realized interconnection between the CAN bus and Ethernet, permitted every authorization upper user on Ethernet visiting and controlling production layer and monitoring equipments in production layer.The article has two points: the design of hardware and the design of software. Hardware design section: selecting the S3C2410X as the core, and finishing the design of the power circuit,the restoration circuit,the serial interface circuit,the CAN module circuit and the Ethernet module circuit and so on.Software design section: taking Linux as the software platform, finishing the Linux install,the download, transplant on the ARM core board. Under the Linux operating system, it compiles the CAN application and controller driver, the protocol transition application. Realized the communication between the CAN bus and the Ehernet.Its stability is satisfied, which is the design of the embedded CAN and Ethernet gateway. And it has realized monitoring the CAN bus via Ethernet, and realized networks interconnection between the CAN bus and the Ethernet.