Transplantation Of Real-time Operating System FreeRTOS Lwip Protocol

The paper as background to the development of embedded network, Analyze a variety of operating systems which popular recently.and compare their Characteristics and applications. And then select FreeRTOS and Lwip as the most suitable software resources for this object.The choice of software resources is critical for embedded systems. Including selected to manage multi-task embedded real-time operating system FreeRTOS and the embedded network protocol Lwip protocol which used to connect between embedded devices in the Internet.Real-time operating system FreeRTOS is a micro-kernel, the small amount of code, real-time, multi-processor supporting, document management norms advantage in the Embedded, widely range of applications foreign. Lwip protocol is designed for resource-constrained embedded systems and development for lightweight network protocol. It not only supports the basic functions of the TCP/IP protocol but also includes other mechanisms, such as the operating system emulation layer, network interface and API interface, and also reduces the system RAM.A detailed analysis of the major hardware functional modules of the platform that the ARM7hardware platforms based on S3C44B0X chip are introduced. Focused on analyzes of the network interface module that using RTL8019as as Ethernet controller chip. Based on hardware/software platform described above, design the method of porting of FreeRTOS and Lwip between different complilers and different microcontrollers, and test them.And then analyze of the basic principles of real-time operating system (FreeRTOS) and embedded network protocol. At the beginning of transplant of FreeRTOS, progressively completed these work that transplant of Lwip. After that the test results of the FreeRTOS and Lwip in a LAN environment will be showed. At last test results prove the feasibility and correctness of this design. It provides a technical solution for real-time operating system FreeRTOS and Lwip Agreement on ARM platform, and completes combination of embedded technology and network technology.