- #include <NXP\iolpc2148.h>
- #include <stdio.h>
- #include <intrinsics.h> //中断头文件
- #include "pll.h"
- void Timer0_int(void);
- const unsigned char TABLE[3]={1,4,8}; //占空比改变的值放到一个数组里
- /**************************延时**************************/
- void Delay(unsigned int dly)
- {
- unsigned int i;
- for(; dly>0; dly--)
- for(i=0; i<5000; i++);
- }
- //主函数
- void main(void)
- {
- char i;
-
- PLL_Init();
- PINSEL1 = (0x03<<12); //MAT0.0连接到管脚
-
- T0EMR = 0x01; //高电平
- T0EMR = 0x01<<4; //匹配低电平
-
-
- T0PR = 0; //9+1个Fpclk，TC增加一次
-
- T0MCR = 0x18; //当MR1和TC相等时,TC复位,产生中断
- T0MR1 = 15000000; //PWM的时钟频率为APB时钟频率的1/1000
- T0MR0 = T0MR1/10; //占空比为90%
-
- T0TCR = 0x02; //定时计数器复位
- T0TCR = 0x01; //定时器使能
-
- VICIntSelect = 0x00;
- VICVectCntl0 = 0x20|VIC_TIMER0;
- VICVectAddr0 = (unsigned int)Timer0_int;
- VICIntEnable = (1<<VIC_TIMER0);
-
- __enable_interrupt();
-
- while(1)
- {
- for(i=0;i<3;i++)
- {
- T0MR0 = T0MR1*TABLE[i]/10;//改变占空比
- Delay(1000);
- }
- }
- }
- //定时器1中断
- void Timer0_int(void)
- {
- // T0IR = 0x02;
-
- T0EMR= 0x01|0x01<<4; //高电平
-
- VICVectAddr = 0;
- }
- //irq 中断入口
- #pragma vector=IRQV
- __irq __arm void irq_handler (void)
- {
- void (*interrupt_function)();
- unsigned int vector;
- vector = VICVectAddr; //获得中断向量.
- interrupt_function = (void(*)())vector;
- if(interrupt_function != NULL)
- {
- interrupt_function(); //调用向量中断函数.
- }
- else
- {
- VICVectAddr = 0; //清除VIC中的中断.
- }
- }
- //fiq中断入口
- __fiq __arm void fiq_handler (void)
- {
- while(1);
- }
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