Design and Implementation of OTG Communication System Terminal Based on USB

To mobile communication requirement of portable device, a USB On-The-Go (OTG) communication system terminal, based on Freescale's 32-bit MCU - MCF52223, is designed in the paper. The system terminal can implement USB host function and USB peripheral function. The system design includes software part and hardware part. The hardware design includes power management circuit and interface circuit design. The OTG software on the IDE of CodeWarrior is designed by component thinking. Firstly, we build the OTG software architecture and analyze its structural characteristics. Secondly, initialization mode judgement software, OTG drive software, host/peripheral software packet and role switch protocol software packet also are designed on the basis of software architecture. Finally, the debugging result is shown in the paper. The result shows that the system terminal can implement not only host function but also peripheral function and has stable performance. Meanwhile, the design also provides a guide to application terminal design based on USB OTG.