Content originally posted in LPCWare by NXP_Paul on Thu Nov 29 07:45:20 MST 2012 Hello The LPC1347 uses a new USB peripheral and is not compatible with the USB peripheral in the LPC1343. In order to migrate to the LPC1347 you will need to change the header file, as well as the USB code. You can download code examples for the LPC1347 from http://www.lpcware.com/gfiles/devper/lpc13xx Regards Paul