基于时间触发的1553B总线实时调度设计

Real time scheduling based on time triggered 1553B bus

为了优化1553B总线传输性能,降低总线消息传输的等待时间,提高总线带宽利用率和紧急消息响应的实时性,对1553B总线调度方法进行了研究,将周期性调度和抢占式调度策略相结合,设计了一种基于时间触发的1553B总线实时调度方法。在时间触发的基准下按优先级对总线消息进行集中调度,总线帧在总线上传输的时间内,处理器无需等待,可以继续处理其他任务。利用总线数据区分区的特性,设计了紧急消息打断普通总线消息传输的抢占式调度策略,避免了非重要数据较长时间占用总线通信信道,使得紧急消息能够快速响应。试验结果表明,该调度方法实现了总线消息尽最大能力传输,不仅能够较大幅度地提高1553B总线传输效率和带宽利用率,而且紧急消息的响应时间稳定在2ms以内,为紧急消息的实时响应提供了保证。

In order to optimize the performance of 1553B bus transmission, reduce the waiting time after the messages transmission, and improve the bus bandwidth utilization and the real time performance of emergency messages response, the 1553B bus scheduling methods were studied, and a real time scheduling method based on the time triggered 1553B bus was designed by using the method of periodic scheduling and preemptive scheduling. On the basis of time trigger, bus messages were centrally scheduled by priority. During the time the bus frame was transmitted on the bus, the processor could continue processing other tasks without waiting for some time. Based on the characteristic of bus data area partition, the preemptive scheduling strategy for emergency messages to interrupt common messages transmission was designed. Non important data didn＇t take up the bus channel for a long time, so that emergency messages were quickly responded. The experimental results show that the proposed method can achieve the maximum capacity of bus transmission. It can improve the transmission efficiency and bandwidth utilization of 1553B bus, while the response time of emergency messages is stable within 2ms.