完整的CCP1捕捉模式程序（MCC18－PIC18F2480）

只看该作者 · 2007-12-26 13:23

#include <p18f2480.h>

unsigned char cap_high;
unsigned char cap_low;

void VectorHigh (void);
void HandlerHigh (void);

#pragma code VectorHigh = 0x08
void VectorHigh (void)
{
  _asm
    goto HandlerHigh //jump to interrupt routine
  _endasm
}
#pragma code

#pragma interrupt HandlerHigh
void HandlerHigh ()
{
//CCP1中断----------------------------------
TMR1H=0;//定时器1一定要在中断里面清0
TMR1L=0;//进入中断先清0，保证计时精度

if(PIR1bits.CCP1IF)
   {
   PIR1bits.CCP1IF = 0;            //一定要在中断里面赋值
   cap_low=CCPR1L;
   cap_high=CCPR1H;
   }

}
#pragma code

void main()
{
//初始化定时器1,Capture用----------------------------------------

TRISCbits.TRISC2= 1; //设定RC2为输入

CCP1CON = 0x04;//CCP1下降沿捕捉模式

T3CON = 0x00;//定时器1是CCP1的时钟源

CCPR1H=0;
CCPR1L=0;

PIE1bits.CCP1IE=1;//CCP1中断打开
PIR1bits.CCP1IF=0;//CCP1溢出标志
IPR1bits.CCP1IP = 1;//CCP1溢出中断优先级为高中断

T1CON = 0x01;//打开定时器1

PIE1bits.TMR1IE=1;//定时器1中断打开
PIR1bits.TMR1IF=0;//定时器1溢出标志
IPR1bits.TMR1IP = 1;//定时器1溢出中断优先级为高中断

INTCONbits.GIE = 1;//全局中断打开
INTCONbits.PEIE=1;//外围设备中断打开

for(;;);

}

只看该作者 · 2010-6-22 15:15

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