USB in DMA mode

Hi every body
I want to get data from PC and store in arm memory and after process sent by ssp.
I use usb_cdc mode and i can't initialize usb in DMA mode.
I use uvision 5 and the project is here:
Download:
www.transferbigfiles.com/.../9MUgnGGqw9o8a39vyHIdUA2

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