main.c

用计时器实现的精准的延时程序的代码

/****************************************Copyright (c)**************************************************
**                               Guangzou ZLG-MCU Development Co.,LTD.
**                                      graduate school
**                                 http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name:			main.c
** Last modified Date:  2004-09-16
** Last Version:		1.0
** Descriptions:		The main() function example template
**
**------------------------------------------------------------------------------------------------------
** Created by:			Chenmingji
** Created date:		2004-09-16
** Version:				1.0
** Descriptions:		The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Descriptions:
**
********************************************************************************************************/
#include "config.h"

# define    LED1    1 << 17                                             /*  P0.17控制LED1  */
# define    LED2    1 << 18 
# define    LED3    1 << 19 
# define    LED4    1 << 20 

uint32 TIME_TICK=0;

void DelayMS(uint32 uiDly)
{  
	T3TCR  = 0x01;
    while(uiDly != 0){
    	if(TIME_TICK == 1){
    		uiDly-=1;
    		TIME_TICK=0;
    	}
    }
    T3TCR=0x02;
    TIME_TICK=0;                	
}

void  Timer3Init(void)
{	
    T3TCR  = 0x02;                                                      /*  定时器0复位                 */
    T3PR   = 0;							                                /*  不设时钟分频                */
    T3MCR  = 0x03;						                                /*  匹配后复位TC，并产生中断    */
    T3MR0  = Fpclk/1000 ;                                                 /*  设置0.5秒匹配值             */
    T3IR   = 0x01;                                                      /*  清除中断标志                */
   // T0TCR  = 0x01;						                                /*  启动定时器0                 */
}

void __irq Timer3ISR (void)
{
	TIME_TICK=1;
	
    T3IR = 0x01;                                                        /*  清除中断标志                */
    VICVectAddr = 0x00;                                                 /*  中断向量结束                */
}

 int main (void)
{// add user source code 
	PINSEL1 = PINSEL1 & (~(0xff << 2));                                 /*  将P0.17~20设置为GPIO           */
    IO0DIR  =( IO0DIR & (~(0x0f<<17))) | LED1 | LED2 | LED3 | LED4;                                                     /*  设置LED控制口为输出         */
    IO0SET   =( IO0SET & (~(0x0f<<17))) | LED1 | LED2 | LED3 | LED4;                                                     /*  LED1熄灭                    */
	
	Timer3Init();                                                       /*  定时器2初始化               */
    IRQEnable ();
	
	VICIntSelect = VICIntSelect & (~(1 << 27));	                        /*  定时器2分配为IRQ中断        */
    VICVectCntl1 = 0x20 | 27;				                            /*  定时器2分配为向量IRQ通道0   */
    VICVectAddr1 = (uint32) Timer3ISR;		                            /*  分配中断服务程序地址        */    
    VICIntEnable =VICIntEnable| (1 << 27);// | (1 << 4)| (1 << 0x06) ;	
    
    while(1){
    	DelayMS(2000);
    	IO0SET = ( IO0SET & (~(0x0f<<17))) | LED1 | LED2 | LED3 | LED4;                                                     /*  LED1熄灭                    */
		DelayMS(1000);
		IO0CLR = ( IO0CLR & (~(0x0f<<17))) | LED1 | LED2 | LED3 | LED4;
    }
    return 0;
}
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/