数码管的亮灭

数码管的亮灭"/>

数码管的亮灭

利用定时器来让标志位进行翻转，然后根据标志位让数码管进行亮灭

#include <STC15F2K60S2.H>
unsigned char count;
unsigned smg_bit=1;
void select138(unsigned char n)
{switch(n){case 4:P2=(0x1f&P2)|0x80;break;case 5:P2=(0x1f&P2)|0xa0;break;case 6:P2=(0x1f&P2)|0xc0;break;case 7:P2=(0x1f&P2)|0xe0;break;case 0:P2=(0x1f&P2)|0x00;break;}
}
void smgshow_bite(unsigned char date,unsigned char pos)
{ 	select138(6);P0=0x01<<pos;select138(7);P0=date;}
void delay(unsigned char i)
{while(i--);
}
void smg()
{if(smg_bit==1){smgshow_bite(0xc0,0);delay(500);}else{select138(6);P0=0xff;select138(7);P0=0xff;}}void Timer0Init()		
{TMOD=0x01;TH0=(65535-50000)/256;TL0=(65535-50000)%256;EA=1;TR0=1;ET0=1;
}void service () interrupt 1
{TH0=(65535-50000)/256;TL0=(65535-50000)%256;count++;if(count>=20){smg_bit=~smg_bit;count=0;}}void main()
{Timer0Init();while(1){smg();}
}