呼吸燈單片機(jī)源碼

ID:152303 · 發(fā)表于 2016-12-5 15:16

#include <AT89X52.h>

#define MAX 0x50 //定時上限定義
#define MIN 0x00 //定時下限定義
#define TIMELINE 11       //時間分頻常數(shù)
#define TRUE  1
#define FALSE 0          //標(biāo)志位常數(shù)

unsigned int TimeCounter;
bit ArrowFlg = 0;       //方向標(biāo)志位
unsigned char upCounter,downCounter; //增加計(jì)數(shù)器和減少計(jì)數(shù)器

sbit LED=P2^0;

//T0的中斷服務(wù)子函數(shù)
void T0Deal() interrupt 1 using 0
{
      TH0=0xf1;
      TL0=0xf1;
      TR0=1;
      TimeCounter++;  //定時計(jì)數(shù)器增加
      if(TimeCounter == TIMELINE)
      {
            if((upCounter == MAX)&&(downCounter == MIN))  //計(jì)數(shù)方向標(biāo)志位切換
{
   ArrowFlg = FALSE;
}
            if((upCounter == MIN)&&(downCounter == MAX))
{
   ArrowFlg= TRUE;
}
            if(ArrowFlg == 1) //如果是增加計(jì)數(shù)
{
   upCounter++;
   downCounter--;
}
            else             //如果是減少計(jì)數(shù)
{
   upCounter--;
   downCounter++;
}
            TimeCounter=0;
      }
}
//延時函數(shù)
void Delay(unsigned int i)
{
      unsigned int j;
      while(i--)
      {
            for(j=0;j<32;j++);    //延時
      }
}

void main()
{
      upCounter = MIN;
      downCounter = MAX;    //計(jì)數(shù)器初始化
      TMOD = 0x01;       //設(shè)置定時器工作方式
      TH0 = 0xF0;
      TL0 = 0xF0 ;       //T0初始化值
      EA = 1;
      ET0 = 1;             //開中斷
      TR0 = 1;             //啟動T0
      while(1)
      {
            LED=0;          //輸出變化的PWM波形
            Delay(downCounter);
            LED=1;
            Delay(upCounter);
      }
}

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