cs7-2.c

《手把手教你学单片机的C程序设计》及实验程序

#include <REG51.H>	
unsigned char code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
/*===================================*/
void delay(unsigned int k);	
//-----------------------------------------------------------
void main(void)			
{					
unsigned char val1=1,val2=1,i;
	while(1)				
	{					
	  for(i=0;i<250;i++)	
	  {				
	  P0= SEG7[val1%10];
	  P2=0xfe;		
	  delay(1);			
	  P0= SEG7[val1/10];	
	  P2=0xfd;			
	  delay(1);			
	  P0= SEG7[val2%10];
	  P2=0xfb;			
	  delay(1);			
	  P0= SEG7[val2/10];	
	  P2=0xf7;			
	  delay(1);			
	  }				
	val1=val1+1;			
	if(val1>99){val1=1;}	
	val2=val2+2;		
	if(val2>99){val2=1;}	
	}					
}						
//----------------------------------------------------
void delay(unsigned int k)
{					
unsigned int i,j;		
for(i=0;i<k;i++){		
for(j=0;j<121;j++)			
{;}}					
}