| This thesis introduces the design of USB OTG Photo-Storage-Drive with direct-file-accessible function. With the prompt of the handheld devices with video function, the flash memory space is not enough. The direct-file-accessible function enables the device to extend the external hard drive with lower cost and less energy.The thesis campares the exist Photo-Storage-Drives on the market. Bring forword the direct-file-accessible method, that is, by establishing exchange buffer within handhold device's memory, to enable the device access the files in the external USB OTG hard drive directly. It concentrated on the business requirement analysis, hardware design and software design. It implemented the direct-file-accessible function and tested its performance. |
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