ARM9嵌入式系统中进行DMA通道的数据传输，在DMA传输中，利用了中断，主要是DMA中断。在此函数的实现过程中，包含了很多信息有通道数、源地址、目的地址、传输数据大小、传输单元以及方式等。-ARM9 embedded system DMA channel for data transmission, the DMA transfer, the use of interrupted, mainly DMA interrupt. The realization of this function in the process, including a lot of information channel, the source address, destination address, data size, as well as the mode of transmission unit.