lpc1788 USB device not recognized

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by Mohammads on Fri Jul 04 02:18:54 MST 2014

when I connect the usb device to computer(all flash erased), it says usb device not recognized(Unknown USB Device (Device Descriptor Request Failed))!
Is that normal and I have to drive the 'USB Device' in LPC1788 by software?
maybe I have a hardware problem?
here is the schematic: