为满足一主控设备分系统间通信的高可靠性需要，提出一种DSP下基于CAN总线的双冗余通信机制。结合主控计算机的实际应用，设计并实现主控计算机CAN总线双冗余通信系统。阐述软硬件的设计和实现过程，剖析双冗余协议设计、帧结构、定时器和中断机制等几个实现上的重点和难点，对主控计算机双冗余通信系统进行可靠性分析和测试。分析和实验结果表明，采用该机制能提高系统间通信的可靠性。%To meet the high reliable demand of the communication among subsystems of the main-controlling equipment ,a dual-redundant communication mechanism based on CAN bus under DSP was proposed .Then ,the dual-redundant communication system of the main-controlling computer combined with the practical application of the system of the main-controlling equipment was designed and implemented .After that ,the designing and implementing process of the software and hardware of the mecha-nism was expounded in details ,the key and difficult points in realizing the design of the dual-redundant protocol ,the frame struc-ture ,the use of timer ,and the interrupt communication were analyzed particularly .Finally ,the reliability of the dual-redundant system of the main-controlling computer was analyzed ,and the testing experiment was done .The analyzed results and experi-mental results show that the mechanism can improve the reliability of the communication between systems obviously .
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