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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.......
its my own code for lpc2148 uart i am sending my code........
#include <LPC21xx.H> typedef unsigned char U8; typedef unsigned int U16; typedef unsigned long int U32; void uartInit(); void serialTrans(U8); void main() { //VPBDIV = 0X02; uartInit(); serialTrans( 's' ); while(1); } void serialTrans( U8 put ) { U1THR = put; while(!(U1LSR & 0X20)); U1LSR &= 0XDF; } void uartInit() { PINSEL0 |= 0X00050000; U1LCR = 0X80; U1DLL = 0X5D; U1DLM = 0X00; U1LCR = 0X03; }
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.