Research And Implementation Of The General Message-Handling System Based On OS20

Digital TV overall shift in the current world has become an irresistible trend. To complete the simulation of the digital transition phase, digital TV set-top boxes are the consumers'first choice to gain digital audio-visual enjoyment. Hardware platforms become increasingly sound and mature, embedded software on the hardware platform do the main impact of products process. Designing a generic, portable embedded information processing systems becomes urgent.Current PC system information processing system through information management center distributes information to the application process. Process complete information management separately. This centralized management and decentralized processing system will become the trend in embedded Message Handling System. The establishment of two Message Processing Center Model based on ST real-time operating system achieves a modular, portable purpose. The first-class model pick up appropriate message to a screening information transmission queue through the system status and the message itself; second-class messaging queue distributes message to the correct responding module by current status of state machine. Focus message distribution mechanism is key technologies in this two-class state machine. Focus mechanism judge, filtrate and distribute information according to the state machine priority, the responding queue priority. Focus message distribution mechanism can filtrate redundancy and reduce system consumption. To speed up message handling system transplantation speed, Driver Interface Converter makes use of the middle layer to shield hardware-related details from the application layer. This simple, but comprehensive interface makes message handling layer information systems and real-time operating system relatively independent.Finally, system testing shows that the two-class information processing center model has modularized, independence, and generalized advantages to facilitate embedded digital TV set-top box software's development and rapid the transplantation of cross-platform.