The Designation And Implementation Of Task Scheduling And Equipment Management In Car Multimedia System

MCU (Micro Control Unit) has been widely used in car electronic and other fields because of its low power consumption and low cost; but the traditional 8-bit MCU can not be equipped with commercial embedded systems, so it does not have the ability of multi-task scheduling, and will result in poor Real-Time performance of the system; in addition, car multimedia devices now commonly faced the problems of equipment management in three aspects:external devices detecting management, audio management and communications processing. To this end, this thesis designed tack scheduling management function, on the bases of this function, this thesis devoted to achieve the three functions of equipment management in car multimedia devices.First of all, this thesis analyzed the car multimedia equipment management system, figured out the needs of its various functional modules, described the overall framework of the system and gave the overall architecture of the system software.Secondly, on the bases of car multimedia system, this thesis made reference to the existing embedded systems, studied the task scheduling algorithm and designed the priority-based scheduling model, then implemented a priority-based scheduling features in the new system; in addition, this thesis designed the message queue mechanism for inter-task communication, completed the underlying functional design.Then on the basis of the multi-task scheduling function, this thesis completed the design of I2C (Inter-integrated Circuit) and UART (Universal Asynchronous Receiver/Transmitter) driver and finished the equipment management features designation and implementation in car multimedia system.Finally, this thesis deployed the system and tested its functions and performance. Results of the tests showed that the system can perform basic functions and the performance can meet-production requirements, in addition, the new system performs better than the old one in real-time performance and hierarchical structures, all of these will bring to the enterprise competitive advantage in similar products.