/*hc-sr04超聲波模塊+11.0592mhz晶振+stc89c52rc單片機+四位數碼管*/
#include <reg51.h>
#include<intrins.h>
unsigned char a,b,c,d;
float num=0.0;
sbit du=P2^6;
sbit we= P2^7;
sbit send=P2^1;
sbit receive=P2^2;
unsigned char duan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char wei []={0xfe,0xfd,0xfb,0xf7,0x2f,0x1f};
void delay_10us()
{
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
}
void delay_200ms(void)
{
unsigned char i,j,k;
for(i=5;i>0;i--)
for(j=132;j>0;j--)
for(k=150;k>0;k--);
}
void main ()
{
unsigned int timeh,timel;
send=0;//先置零
while(1)
{
receive=0;//置零
EA=0;
send=1;
delay_10us();
delay_10us();//延時20us
send=0;
while(receive==0)//等待高電平
{};
TMOD=0X01;//設置定時器0的工作方式
TH0=0;//賦初值
TL0=0;
EA=1;///打開總中斷開關
ET0=1;//打開定時器開關
TR0=1;
while(receive)//等待低電平
{
}
timeh=TH1;//取出定時器的值
timel=TL1;
TR0=0;
num=(TH0*255+TL0)/100.0*340/2;
a=(unsigned int )num%10;//算清各位十位百位
b=(unsigned int)num%100/10;
c=(unsigned int )num/100%10;
d=(unsigned int)num/10;
P0=0xff;//數碼管顯示輸出
we=1;
P0=0xfe;
we=0;
P0=0x00;
du=1;
P0=duan[a];
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
P0=0x00;
du=0;
P0=0xff;
we=1;
P0=0xfd;
we=0;
P0=0x00;
du=1;
P0=duan;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms；
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
P0=0x00;
du=0;
P0=0xff;
we=1;
P0=0xfb;
we=0;
P0=0x00;
du=1;
P0=duan[c];
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
P0=0x00;
du=0;
P0=0xff;
we=1;
P0=0xf7;
we=0;
P0=0x00;
du=1;
P0=duan[d];
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
delay_200ms;
P0=0x00;
du=0;
}
}
void timer0 ()interrupt 1
{
TH0=0;
TL0=0;
}
/*四位數碼管要消影+注意定時器和外部中斷的使用*/
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