I am working on a program based on LPC2148. Included header file #include <LPC214X.H>. But identifiers such as PINSEL0, IODDIR0, IOSET0, IOCLR0 are showing as undefined identifier. May i know why it is showing so?
Review what LPC214X.H actually defines, and if it is the same era/version as the code you are lifting.