hello.c

ARM例子

/******************************************************************************/
/*  This file is part of the uVision/ARM development tools                    */
/*  Copyright KEIL ELEKTRONIK GmbH 2002-2004                                  */
/******************************************************************************/
/*                                                                            */
/*  HELLO.C:  Hello World Example                                             */
/*                                                                            */
/******************************************************************************/

#include <stdio.h>                /* prototype declarations for I/O functions */
#include <LPC21xx.H>              /* LPC21xx definitions                      */


/****************/
/* main program */
/****************/
int main (void)  {                /* execution starts here                    */

  /* initialize the serial interface   */
  PINSEL0 = 0x00050000;           /* Enable RxD1 and TxD1                     */
  U1LCR = 0x83;                   /* 8 bits, no Parity, 1 Stop bit            */
  U1DLL = 97;                     /* 9600 Baud Rate @ 15MHz VPB Clock         */
  U1LCR = 0x03;                   /* DLAB = 0                                 */

  printf ("Hello World\n");       /* the 'printf' function call               */

  while (1) {                     /* An embedded program does not stop and    */
    ;  /* ... */                  /* never returns.  We've used an endless    */
  }                               /* loop.  You may wish to put in your own   */
}                                 /* code were we've printed the dots (...).  */