按键小灯左右移的单片机程序

ID:410287 · 发表于 2018-10-15 23:31

#include<reg52.h>
#define uchar unsigned char
sbit key1=P3^5;
sbit key2=P3^4;
void delay(uchar k)
{
   uchar i,j;
   for(i=k;i>0;i--)
      for(j=110;j>0;j--);
}
void moveleft()
{
if(P1 == 0x7f) //0111 1111
      P1 = 0xfe; //1111 1110
else
      P1 = (P1 << 1) + 1 ; // 1111 1100 ->  1111 1101
}
void moveright()
{
if(P1 == 0xfe)
      P1 = 0x7f;
else
      P1 = (P1 >> 1) + (1 << 7);
}
void main()
{
P1 = 0xfe; //1111 1110
P3 = 0xff; //1111 1111
while(1)
{
      if(key1 == 0)
      {
            delay(20);
            if(key1 == 0)
            {
                  while(!key1); //等待按键抬起
                  moveleft();
               }
         }

         if(key2 == 0)
         {
            delay(20);
            if(key2 == 0)
            {
                  while(!key2);
                  moveright();
            }
         }
   }
}

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按键小灯左右移的单片机程序

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