Design and implementation of embedded Ethernet based on the RX62N microcontroller

In recent years, along with the development of industrial control equipments and electric vehicles, the control and communication communities have witnessed the growing demand of system interconnection, intercommunication, and interoperation. Therein a key issue is to connect these objects to a network through embedded control chips. In this paper, we design and implement an embedded Ethernet system based on the Renesas RX62N. The Renesas RX62N 32-bit chip has an embedded Ethernet Controller. To achieve stable and reliable embedded network connection, we transplant μC/OS-II, a realtime operating system written by Micriμm Company, to the platform; In the TCP/IP layer, we write device drivers of the DP83640 physical chip and the RX62N Ethernet controller such that they are compatible to the μC/TCP-IP protocol stack; In the application layer, the main challenge is dynamic IP address assignment, which is solved by μC/DHCPc protocol stack. After obtaining the address, a simple TCP client-server socket application is implemented. The embedded Ethernet system is verified in a real-world network environment. Experiments demonstrate that the system is able to fulfill basic network communication.