基于51单片机控制四位共阳数码管做的秒表仿真 -

#include <reg51.h>
sbit AN_Jian1=P1^0;
sbit AN_Jian2=P1^1;
unsigned char code ledcode[]={0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,0x80,0x90};
unsigned char js10ms,js100ms,jsgw,jssw,t010ms,t05ms,t0sm;
bit displayflag;
bit switchflag;
void jsInit(void);
void timeInit(void);
void timeStart(void);
void timeStop(void);
void display(unsigned char n1,unsigned char n2,unsigned char n3, unsigned char n4);
void delay_20ms(void)
{
unsigned char i,j,k;
for(i=20;i>0;i--)
for(j=20;j>0;j--)
for(k=10;k>0;k--);
}
void main(void)
{
jsInit();
timeInit();
while(1)
{
if(AN_Jian1==0)
{
timeStart();
}
if(switchflag)
{
timeStop();
}
else
{
timeInit();
timeStart();
}
if(AN_Jian2==0)
{
timeStart();
displayflag=0;
}
if(AN_Jian1==0)
{
jsInit();
displayflag=0;
}
display(jssw,jsgw,js100ms,js10ms);
}
}
void time0(void) interrupt 1
{
TH0=0xee;
TL0=0x00;
if(AN_Jian2==0)
{
switchflag=~switchflag;
}
t010ms--;
if(t010ms==0)
{
t010ms=2;
js10ms++;
if(js10ms==10)
{
js10ms=0;
js100ms++;
if(js100ms==0x0a)
{
js100ms=0x00;
jsgw++; //????????1
if(jsgw==0x0a)
{
jsgw=0x00;
jssw++;
if(jssw==0x0a)
{
jssw=0x00;
}
}
}
}
}
}
void jsInit(void)
{
js10ms=0x00;
js100ms=0x00;
jsgw=0x00;
jssw=0x00;
}
void timeInit(void)
{
TH0=0xee;
TL0=0x00;
TMOD=0x01;
IE=0x82;
}
void timeStart(void)
{
TR0=1;
}
void timeStop(void)
{
TR0=0;
}
void display(unsigned char n1,unsigned char n2,unsigned char n3, unsigned char n4)
{
P2=0x04;
P0=ledcode[n1];
delay_20ms();
P2=0x08;
P0=ledcode[n2]&0x7f;
delay_20ms();
P2=0x10;
P0=ledcode[n3];
delay_20ms();
P2=0x20;
P0=ledcode[n4];
delay_20ms();
}

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