multifunction-key.c

8951系列单片机仿真。包括流水灯、数码管、定时器、点阵、液晶等

#include <AT89X51.H> 
unsigned char ID; 
void delay10ms(void) 
{ 
  unsigned char i,j; 
  for(i=20;i>0;i--) 
  for(j=248;j>0;j--); 
} 
  
void delay02s(void) 
{ 
  unsigned char i; 
  for(i=20;i>0;i--) 
    {delay10ms(); 
    } 
} 
  
void main(void) 
{ while(1) 
    { if(P3_7==0) 
        {delay10ms(); 
          if(P3_7==0) 
            { 
              ID++; 
              if(ID==4) 
                { 
                  ID=0; 
                } 
              while(P3_7==0); 
            } 
        } 
      switch(ID) 
        { case 0: 
            P1_0=~P1_0; 
            delay02s(); 
            break; 
          case 1: 
            P1_1=~P1_1; 
            delay02s(); 
            break; 
          case 2: 
            P1_2=~P1_2; 
            delay02s(); 
            break; 
          case 3: 
            P1_3=~P1_3; 
            delay02s(); 
            break; 
        } 
    } 
}