I do not found much suport files (librararies,readymade functions etc.) for LPC1768 as almost all libraries available for STM32.
So the problem is what exactly? That you have to write some code, nxp doesn't support their parts, or that you picked the wrong chip architeture for your project?
That you have to write some code, nxp doesn't support their parts, or that you picked the wrong chip architeture for your project?
Or that you just haven't looked very hard?
Or looked in the wrong place?
www.nxp.com/.../LPC1700.html
http://www.lpcware.com/
Remember that mbed started on LPC1768
www.nxp.com/.../OM11043.html
mbed.org/.../
There are lots of sample code available for the 17xx chips.
And most of the LPC23xx samples can be used too with very minor updates because of the switch of interrupt controller.