| With the rapid development of information technology, networked embedded system hasbecome one of the main trends. In register system, if engineers pursuit the effect of real-time,reliability and high precision, there will be a disadvantage in communication capability ofthe equipment, which impacts monitoring performance. This thesis proposes the F28M35xchip in the lower computer, its dual-core structure eliminates the compromise betweencontrol accuracy and real time communication. Developing network module in the chip cancontribute to remote debugging and real-time monitoring of register system.After discussing the mainstream embedded operating systems and network protocols,the thesis introduces the method of combining μC/OS-Ⅱ and LwIP(Light weight IP) toachieve the network function of register system. μC/OS-Ⅱ is a preemptive real-time kernelwhich supports multitasks, but it doesn’t contain network protocols. So porting the LwIP toit can be an appropriate resolution. Firstly, the thesis describes the register monitoringsystem’s overall architecture and μC/OS-Ⅱ’s porting procedure to the Cortex-M3processorof F28M35x. Then it analyzes the function modules, process model, dynamic memorymanagement and interface designing of LwIP, and programs its operating system emulationlayer functions and underlying network device drivers, making LwIP work well withμC/OS-Ⅱ and the hardware. At last, a miniature embedded Web server is designed tovalidate the LwIP port. After debugging, the Modbus/TCP protocol is developed on thelower computer’s application layer, and a human-machine interface is designed on the hostcomputer. The entire system is applied to register monitoring system.The test result shows that the LwIP is ported correctly and its combination withμC/OS-Ⅱ is a feasible method.In the register monitoring system, the human-machineinteraction is convenient, and data can be transferred steadily and fast, showing goodreal-time performance. |
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