IEEE1394是一种应用领域不断推广的高性能串行总线技术.但在某些工业应用场合,基于DDK开发的1394通用驱动程序可能难以满足实时性需要.该文在1394总线规范和RTX嵌入式实时环境的基础上,阐述了一种新的采用DMA方式开发1394实时驱动程序的原理和方案,并以1394异步数据包的发送为例介绍了新方案的具体实现方法.“,”As a high performance serial bus technology, IEEE 1394 is continuously expanding its application areas. However, the universal 1394 device driver developed by DDK may not be able to meet the demands of industrial real-time application. On the basis of IEEE 1394 criterion and RTX embedded real-time environment, this paper expounds the new principle and method of developing real-time driver for 1394 devices by DMA. Then the detailed way to implement 1394 asynchronous data transmission as an example is introduced.