Abstract: This paper adopts USB technology and SD card as storage medium, and proposes a solution for developing USB mass storage devices on AT91SAM7S64 processor. This system is based on the USB device port embedded in the processor and complies with the mass storage device class specification. From the functional point of view, the system implementation is divided into four levels: physical layer, device enumeration layer, device response layer and disk function layer, realizing data exchange between embedded system and PC.
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