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Design of a USB OTG Mass Storage Module Based on LM3S9B90

This paper introduces the method of design a USB On-The-Go (OTG) mass storage module according to USB 2.0 specification, which bases on embedded systems LM3S9B90. This module’s hardware system and software system is described, focusing on the implementation of USB host system. The module realizes USB OTG function, not only can realize functions of read and write USB mass storage devices, but also can exchange data with USB host as a USB mass storage device, can be used as an extension of USB system and has good application value.