| Embedded system is a kind of special application-oriented computer system. It is based on computer technology and can meet the strict requirement of function, reliability, cost, volume, and power consumption by adjusting its hardware and software. With rapid development of hardware technology and software technology of the computer, embedded-system technology is getting more reliable and perfect step by step. At present, embedded system has been widely used in many fields such as industrial control, traffic control, and etc, because of its high reliability, high performance and low power consumption and so on. As this development, the new MCU has great progress in every performance and embedded processor is more suitable to development of digital control. It has great stability, and it does not need excessive resource and is not disturbed by relate hardware. So the system meets needs of process control. The embedded MCU is highly integrated and there are many kinds of functions on the chip. The network function has been improved and also there are many kinds of interfaces integrated. The developing means and testing platform are more and more perfect. The widely use of RTOS provides MCU development with good platform of task management and bottom drive, and also guarantees the steady and convenient development and management of apply software.This paper brings forward an embedded, opening and latticing numerical control structure based on the research of the theory of Embedded System and Flexible Embedded Digital Control System and describes the structure design in hardware and software. The kernel of hardware is based on ARM+DSP system to form the main control platform. And it also equipped with the required peripheral modules to extend itself to one whole hardware system. The software is based onμC/OS-Ⅱreal-time embedded operating system, and the required application software needs to be developed so as to turn uC/OS-II real-time embedded operating system into one practical embedded NC system.On the basis of in-depth research on the contents how to transplantμC/OS-Ⅱreal time embedded operating system into hardware platform and how tasks run in the preemptive kernel ofμC/OS-Ⅱreal-time embedded operating system, the management tasks of NC system are assigned with reason. And then their priorities and scheduled time are also assigned according to the need of system so that efficiency of program and real time requirement of task can be optimized. The paper analyzed the regulations, structures and characteristics of NC code and developed a rapid and general NC code translator. Some key technologies are investigated as follows. The paper also studied the structure of FAT16 file system and designed the embedded file system to manage NC files effectively according to the management idea of FAT16 file system. Rather, the paper studied deeply the module and protocol of reliable communication in serial network, which are composed of ARM main control board, DSP motion control board, keyboard board and I/O control board, and then developed communication software of the serial network and realized the real-time monitoring system.The System could overcome defects of current digital control system and realize real-time reservoir operation by modularize design of hardware and software and support ofμC/OS-Ⅱ. Also it improves the reliability and stability and it could have many kinds of network support, which is accord with the development of modularization, flexibility and latticing. |
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