i am new to arm controller.... i am using keil micro vision 3........... while building my code it shows... ***************************************************** startup.o(.text+0x12c):/cygdrive/f/CHECK/check_uart/Startup.s:256: undefined reference to '_start' ____________________________________________________ startup.o(.text+0x140):/cygdrive/f/CHECK/check_uart/Startup.s:256: undefined reference to '_data' ***************************************************** WHAT IT MEANS.......... i am using lpc2148...... i want to learn it properly........ if it is possible give me the maximum details.....links.......
If this is the case, then I think that you should follow Andy's advice first.
See this:
http://www.keil.com/support/man/docs/gsac/gsac_createapps.htm
One more thing, do you have your own LPC21xx.H?
In your case, you should have only two files, one is your code, another is KEIL's startup code.