Design Of Embedded System Porting Based On The ARM

With the development of computer technology, communication technology and the in-depth application of the Internet, embedded systems are widely applied to many fields including science research, engineering design, military technology, industry and commerce. Embedded technology is also obtained the widespread application in the medical instrument field, by its own high performance, low cost, low power lost, embedded technology has played the huge role in ECG real-time data acquisition and processing.At the first of this paper, the significance of this subject study is discussed. And then, the key technologies, embedded technology and data acquisition technology are introduced. The basic conception and the characteristic of embedded system, the operating system of embedded system, the microprocessors of embedded system, ARM microprocessors and the application fields of modern embedded system, the characteristic and the constituents of modern data acquisition system, the measuring technology of weak signal are systematically expounded.ARM architecture and Linux porting research is deeply studied. The types of embedded microprocessor are summarized at first, with the types and productions of ARM microprocessor. Then the chip of AT91RM9200 is introduced, including the core of the microprocessor, the mode of the processor, registers, memory system, the mode of addressing and interrupt. Designing and transplanting the embedded software and the hardware platform are inalienable, they constitute the embedded system corporately. The software of embedded system with embedded operating system includes bootloader, embedded operating system, file system and application. In this paper I declare how to develop and transplant the software above, include building the cross complier—Cygwin, configuring the NFS server, TFTP server and the serial communication program on the host PC, writing the starting code, modifying and configuring of the kernel, realizing the root system, translation and executing application program. Then introduce these codes during the porting process in detail.