Micro Operation System for Microprocessor Applications

摘要

Real-time applications for embedded systems often use microprocessor systems. Especially when using single-chip microprocessors, there are limitations with size of the operation and program memory and those are disadvantages to use conventional RTOS, which occupy unnecessarily amount of memory, and most of their services will remain unused. It is shown, that the appropriate strategy is to separate processing of input signals, custom application and output signals into CPU peripherals. To synchronize the processes in embedded applications is sufficient to implement the wait states, the sleeps state, and some synchronization means. Presented system includes subsystems: (a) the cooperative management as many as eight to sixteen tasks for time-independent role and (b) preemptive multitasking for time role management. In this mode are solved objective tasks of numerical control and implementation of PID controllers. The proposed solution will bring simplified design of digital control applications, when the commercially delivered applications are unnecessary robust and solve task like file management etc. Proposed solutions will reduce tasks management the minimum, so that minimizes memory demands of the microprocessor units with providing basic management tasks. A number of vendors offer real-time operating systems (RTOS) for Microchip PIC MCUs and dsPIC DSCs. Many of these products provide a full range of features and are designed to be run on PIC32, dsPIC, PIC24 and even PIC 18 processors When choosing an RTOS, consider the following questions: Applicability: Is an RTOS an appropriate for my project? Features: What features does a typical RTOS support? Performance: What factors influence RTOS performance? Commercial Considerations: What kind of company stands behind an RTOS? Licensing Model: Under what terms can I distribute an RTOS-based application? Cost: How much does an RTOS cost? Applicability: Is an RTOS an appropriate for my project? A set of limitations is there, too. An RTOS used system resources, both FLASH and RAM. They can be used on larger processor families such as the PIC24, dsPIC and PIC32. On the other hand applications which are modular and integrate elements mostly written by different authors are suitable for running under an RTOS.