main.c

ARM7(LPC2124)学习的一些例程

#include <LPC21xx.H>                        

#define LED 0x000001					//LED,P0.0

unsigned int timeCount = 0;

void Timer0_ISR(void)__irq;				/*Timer0定时器中断函数*/

void timer0_init(void)					/*定时器0初始化*/
{
	T0MR0 = 119999;						/*12MHz晶振每次中断0.1s*/
	T0MCR = 3;							/*匹配MR0时中断，同时复位TC*/
	T0TCR = 1;							/*使能定时器0*/
	VICVectAddr0 = (unsigned long)Timer0_ISR;
	VICVectCntl0 = 0x24;				/*Slot 0,4号中断*/
	VICIntEnable = 0x000010;			/*开启定时器0中断*/
} 

int main(void) {
  PINSEL0 = 0;                          /*设置引脚为GPIO */
  IO0DIR |= LED;                   		/*将P0.0设置为输出 */				
  IO0SET = LED;                        	/*将P0.0置1，也就是让led灭 */
  timer0_init();
  while (1);
}

void __irq Timer0_ISR(void)
{
	T0IR = 1;							/*清除中断标志*/
	timeCount++;
	if(timeCount==10)					/*1秒时间到，改变LED状态，使之闪烁*/
	{
		if(IO0SET & LED)
		{
			IO0CLR = LED;
		}
		else
		{
			IO0SET = LED;
		}
		timeCount = 0;
	}
}