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请问C5535的SD卡和USB间可否直接DMA?

各位专家,如题,我想实现把SD卡内的数据通过USB方式快速上传到PC,基于CCS7.2和ezdsp5535,请问

1.CSL example中有SD卡与memory间,及memory与USB的DMA例程,请问能否直接SD卡与USB间的DMA?

2.若可以,请问USB的DMA 目的地址如何设置?

3.若不行,请问是否只能SD卡-memory-USB这样两级DMA?

4.请问还有没有更好的办法?

多谢!