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The boot ROMs in some of the LPC devices contain flexible USB device stack to simplify the USB application development. The USB ROM stack has built-in support for Communication Device Class (CDC), the Human Interface Device (HID), the Mass Storage Class (MSC) and Device Firmware Upgrade (DFU) class. It also supports composite device model consisting of multiple interfaces of above supported classes. This document provides information on how to use this stack through the exposed ROM API.
The location of USBD_API_T structure in ROM is stored in ROM driver table. Below is the list of chip series and the location where the pointer to USBD_API_T* is stored. The 3rd column in the table below lists the expansion of USBD_API macro used in the usage.