blinky.c

ARM开发例程,KEIL_ARM编译环境.

/******************************************************************************/
/*  This file is part of the uVision/ARM development tools                    */
/*  Copyright KEIL ELEKTRONIK GmbH 2002-2004                                  */
/******************************************************************************/
/*                                                                            */
/*  BLINKY.C:  LED Flasher                                                    */
/*                                                                            */
/******************************************************************************/
                  
#include <stdio.h>                        	/* standard I/O .h-file */
#include <LPC21xx.H>                       	/* LPC21xx definitions  */

extern void init_serial (void);            	/* Initialize Serial Interface     */


void sendhex(int hex)                      	/* Write Hex Digit to Serial Port  */
{  
	if(hex > 9) putchar('A' + (hex - 10));
  	else        putchar('0' +  hex);
}

void sendstr(char *p)                      	/* Write string */
{  
	while(*p) 
	{
    	putchar(*p++);
  	}
}

void delay (void)                         	/* Delay function */
{  
	unsigned int cnt;
  	unsigned int val;

  	ADCR |= 0x01000000;                		/* Start A/D Conversion */
  	do 
	{
    	val = ADDR;                      	/* Read A/D Data Register */
  	}while((val & 0x80000000) == 0);       	/* Wait for end of A/D Conversion */
  	ADCR &= ~0x01000000;                 	/* Stop A/D Conversion */
  	val = (val >> 6) & 0x03FF;            	/* Extract AIN0 Value */

  	sendstr("\nAIN0 Result = 0x");     		/* Output A/D Conversion Result */
  	sendhex((val >> 8) & 0x0F);          	/* Write 1. Hex Digit */
  	sendhex((val >> 4) & 0x0F);         	/* Write 2. Hex Digit */
  	sendhex(val & 0x0F);                    /* Write 3. Hex Digit */

  	val = (val >> 2) << 12;             	/* Adjust Delay Value */
  	for (cnt = 0; cnt < val; cnt++);     	/* Delay */
}
  
int main (void) 
{
  	unsigned int n;

  	IODIR1 = 0x00FF0000;                 	/* P1.16..23 defined as Outputs  */
  	ADCR   = 0x002E0401;                	/* Setup A/D: 10-bit AIN0 @ 3MHz */
  	init_serial();                      	/* Initialize Serial Interface   */

  	while(1) 
	{                              			/* Loop forever */
    	for(n = 0x00010000; n <= 0x00800000; n <<= 1) 
		{
      		/* Blink LED 0, 1, 2, 3, 4, 5, 6, 7 */
      		IOSET1 = n;                          /* Turn on LED */
      		delay();                             /* Delay */
      		IOCLR1 = 0x00FF0000;                 /* Turn off LEDs */
		}
  	}
}