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6657与6455都有EDMA3，两者差别大吗？哪些地方有差别？我想讲6455的程序移植到6657上，EDMA3改动大不大？
从手册看，EDMA3本身的用法基本一样，只是6657的PaRAM数量加倍了编程的时候需要注意不同型号的芯片，EDMA3映射到system interrupt的事件号和触发EDMA3的事件号应该会有较大差别具体请参见芯片的datasheet
6455EDMA3 Controller (64 Independent Channels)256 PaRAM entries4 transfer controllers/event queues
6657512 PaRAM entries64 DMA channels 4 transfer controllers and four event queues
