Content originally posted in LPCWare by emimad on Wed Sep 09 15:09:21 MST 2015
Solved with last LPCXpresso IDE update.
Only need to add
#if defined (__USE_LPCOPEN)
SystemCoreClockUpdate(); <---
setSYSTICK(); <---
PI0_4 didn't worked because it's an open drain pin. Just pull up and start playing!