ccp.c.bak

PIC18F4580计算频率的程序

#include "PIC18.h"
#include "def.h"
#include "lib.h"

void tmr3_isr(void)
{

	}
void ccp1_isr(void)
{	

}

void ccp1_init(void)
{
 GIE=0;//关全局中断
 PEIE=1;//开中断优先级
 IPEN=1;

 T3CON=0xc8;  //1100 1000B T3以16位读写，作为CCP1的时钟源，1/4内部信号，分频1：1，T3暂停
 CCP1CON=0x05;//CCP1模块设置为捕获模式，每1个上升沿捕获一次
 
 TMR3IE=0;//暂停T3中断
 CCP1IE=0;//暂停CCP1中断
 TMR3IP=0;//T3溢出中断为低优先级
 CCP1IP=0;//CCP1捕获中断为低优先级
 TMR3IF=0;//清空T3中断标志
 CCP1IF=0;//清空CCP1中断标志

 CCPR1H=0X00;
 CCPR1L=0X00;//清空捕捉定时器
 
 TMR3H=0X00;//T3计时器清零，先写入高8位，再写入低8位
 TMR3L=0X00;//
 }

void ccp(void)
{
 now_channel=0x00;//现在转换的通道
 channel_int_num=0xff;//通道中断的次数 BIT 
 channel_error=0x00;
 channel_open_close=0x01;//
 ccp_over=0;
 high_int=0;
 while(now_channel<8)
 {
 	if((channel_open_close&(1<<now_channel))==0)//当前通道是关闭的
 		{
 		 now_channel++;
         continue;
 		}
  
      CHANNEL_PORT=now_channel;//输出通道选择码
      delay(1000);
 
      TMR3ON=0;//暂停T3
      TMR3H=0X00;
      TMR3L=0X00;//重载T3数值
      TMR3IE=1;//使能T3中断
      TMR3ON=1;//打开T3
      CCP1IE=1;//使能CCP中断 
      while(!ccp_over&&high_int==0)//等待CCP过程结束,并且没有高优先级的中断
        CLRWDT() ;
      if(high_int==1)//有更高优先级中断发生过，重新开始本通道检测
       {
        high_int=0;
        ccp_over=0;
        continue; 
       }         
      else
       {
         if((channel_error&(1<<now_channel))==0)//当前通道没有错误
          {
       	    channel_int_num|=(1<<now_channel);//将通道中断次数置1
            channel_period[now_channel][2]=channel_period[now_channel][1]-channel_period[now_channel][0];
          }
         now_channel++;//端口号+1，下一端口转换
         ccp_over=0;
       }
     }
}

void frequency_caculate(void)
{
	uchar i;
	for(i=0;i<8;i++)
	 {
	 	if((channel_open_close&(1<<i))==0)
	 	  {
	 	   display_point[0]=(uchar*)&ASCII[('C'-0x20)*5];
	 	   display_point[1]=(uchar*)&ASCII[('L'-0x20)*5];
	 	   display_point[2]=(uchar*)&ASCII[('O'-0x20)*5];
	 	   display_point[3]=(uchar*)&ASCII[('S'-0x20)*5];
	 	   display_point[4]=(uchar*)&ASCII[('E'-0x20)*5];
	 	   display_point[5]=(uchar*)&ASCII[('D'-0x20)*5];
	 	   display_ascii(6,display_point,i,0);
	 	}
	 	else 
	 		if((channel_error&(1<<i))==1)//不正常
	 			{
	 			 display_point[0]=(uchar*)&ASCII[('E'-0x20)*5];
	 	         display_point[1]=(uchar*)&ASCII[('R'-0x20)*5];
	 	         display_point[2]=(uchar*)&ASCII[('R'-0x20)*5];
 	 	         display_point[3]=(uchar*)&ASCII[('O'-0x20)*5];
	 	         display_point[4]=(uchar*)&ASCII[('R'-0x20)*5];
                 display_point[5]=(uchar*)&ASCII[0];
	 			 display_ascii(6,display_point,i,0);
	 			}
	 		else
	 			{
	 				frequency[i]=(uint)((FOSC/channel_period[i][2])>>2);
	 				data_change(channel_period[i][2]);
	 				display_point[0]=(uchar*)&ASCII[(display_data[3]+0x10)*5];
	 				display_point[1]=(uchar*)&ASCII[(display_data[2]+0x10)*5];
	 				display_point[2]=(uchar*)&ASCII[(display_data[1]+0x10)*5];
	 				display_point[3]=(uchar*)&ASCII[(display_data[0]+0x10)*5];
                    display_point[4]=(uchar*)&ASCII[('H'-0x20)*5];
                    display_point[5]=(uchar*)&ASCII[('z'-0x20)*5];
	 				display_ascii(6,display_point,i,0);
	 				}	
	 	}
}