lpcusb is a USB core stack for the built-in USB device of LPC214x microcontrollers. It handles the hardware interface and USB enumeration/configuration. Included are usage examples like USB joystick HID, USB virtual COM port and USB mass storage on SD-ca
I was able to set this up in Keil MDK ARM and uV4 IDE in a matter of minutes (for LPC2148 header board). A very clean and flexible library. Highly recommended for everyone who wants to get USB applications started on the fast track.