【摘要】 在节点数量较多的CAN通信网络中,如果使用基于位竞争的无损仲裁机制的标准协议使各报文按照优先权顺序发送,则总线负担较重,且优先权较低的报文会出现较大的发送延时。本文采用TTCAN总线时间触发和动态的调度机制,利用微控制器的硬件定时中断,结合软件编程算法,使CAN测控网络获得良好的工作特性,有效地减少了发送延时,提高了总线的利用率。更多还原

【Abstract】 It is hard to transmit lower priority frames in worst-case if only the protocol based on bit arbitration mechanism of standardized CAN bus is employed under stringent timing constraints. This paper presents a protocol of fieldbus communication based on the time-triggered controller area network (TTCAN), which fulfills both dynamic priority schedule and combination of time-and event-triggered traffic. The protocol is implemented in a monitoring system to achieve good operation characteristics, lower delay time and high utilization of the bus by use of hardware timing interrupt of microcontroller and software programming algorithm.更多还原