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單片機霍爾自行車里程測速儀源程序：

//時間：4月7日15:22:04
//目的：學習編程
//說明1：P00---P07:a-----dp P27---P24:com1-----com4 P34切換顯示 P32---INT0 一個磁鋼
//說明2：此程序針對車輪周長為207cm,其他型號周長,可改變參數就行
//說明3：數碼管從左至右高------低
#include<reg51.h>
#include"juxun001.h"
//====================================主函數=========================================================
void main()
{
time0_int0_init();//定時器0和外部中斷0的初始化
while(!TR0) //上電一直未切割時就顯示 0.0.0.0
{
init_display();
}
while(1)
{
if(!change)//按下切換按鍵顯示里程
{
delay1m(5);
if(!change)
{
flag = ~flag;
}
while(!change);
}
}
}
//==================================定時器0中斷函數================================
void time0_interrupt()interrupt 1
{
TL0 = (65536 - 5000) % 256;// 12M晶振，5ms定時
TH0 = (65536 - 5000) / 256;
display_function();
time_counter++;
time_counter8++;
if(time_counter8 >= 1600)//大于8s沒切割，車子視為停下了,速度為：0，但里程還記著
{
time_counter8 = 0;
speed = 0;//速度為 0
point1 = 0;
buf1[3] = speed%10;buf1[2] = speed/10%10;
buf1[1] = speed/100%10;buf1[0] = speed/1000%10;
}
}
//==================================外部中斷0中斷函數=========================
void int0_interrupt()interrupt 0
{
external_counter++;
if(external_counter ==1 )TR0 = ~TR0;//第一次切割打開定時器0
if(external_counter == 65535)external_counter = 0;
time_counter8 = 0; //只要8秒內有切割，車子就任在運行
if(external_counter % 2 == 0)//切割2次更新下速度
{ //*5是因為中斷一次是5MS
if(flag1==0){speed =((ulong)(36000)*zhouchang)/(time_counter * 5);flag1=1;}
else if(flag1==1){speed =((ulong)(36000)*2*zhouchang)/(time_counter * 5);}//速度：單位為 m/h ,*1000的目的是不出現浮點數
if((speed >= 100)&&(speed < 1000)) //100 ---- 1000 3位整數
{
point1 = 1;buf1[3] = speed%10;buf1[2] = speed/10%10;
buf1[1] = speed/100%10;buf1[0] = 0;}
else if((speed >= 1000)&&(speed < 10000)) //1000 ---- 10000 4位整數
{
point1 = 1;speed = (uint)speed;
buf1[3] = speed%10;buf1[2] = speed/10%10;
buf1[1] = speed/100%10;buf1[0] = speed/1000%10;}
else if((speed >= 10000)&&(speed < 100000)) //10000 ----- 100000 5位整數
{
point1 = 2;
buf1[3] = speed/10%10;buf1[2] = speed/100%10;
buf1[1] = speed/1000%10;buf1[0] = speed/10000%10;}
else if((speed >= 100000)&&(speed < 1000000)) //100000 ------ 1000000 6位整數
{
point1 = 3;
buf1[3] = speed/100%10;buf1[2] = speed/1000%10;
buf1[1] = speed/10000%10;buf1[0] = speed/100000%10;}
time_counter = 0;
}
if(external_counter % 8 == 0)//每切割8次更新下里程
{
s = (ulong)external_counter * zhouchang; //里程：單位為 cm
if((s >= 1000)&&(s < 10000))
{
point2 = 1; // 0.012 001212
buf2[3] = s/100%10;buf2[2] = s/1000%10;
buf2[1] = 0;buf2[0] = 0;}// 4位整數
else if((s >= 10000)&&(s < 100000))
{
point2 = 1;
buf2[3] = s/100%10;buf2[2] = s/1000%10;
buf2[1] = s/10000%10;buf2[0] = 0;}// 5位整數 0.123 012345
else if((s >= 100000)&&(s < 1000000))
{
point2 = 1;
buf2[3] = s/100%10;buf2[2] = s/1000%10;
buf2[1] = s/10000%10;buf2[0] = s/100000%10;} // 6位整數 1.234 1234 56
else if((s >= 1000000)&&(s < 10000000))
{
point2 = 2;
buf2[3] = s/1000%10;buf2[2] = s/10000%10;
buf2[1] = s/100000%10;buf2[0] = s/1000000%10;}// 7位整數 1234 567
else if((s >= 10000000)&&(s < 100000000))
{
point2 = 3;
buf2[3] = s/10000%10;buf2[2] = s/100000%10;
buf2[1] = s/1000000%10;buf2[0] = s/10000000%10;} // 8位整數 1234 5678
}
}
//==================================開電源就顯示的數據,初始顯示速度========================
void init_display()
{
uchar i;
for(i = 0;i < 4;i++)
{
wei = bitcode[num - 1];
led = display1[buf1[num--]];
delay1m(4);
if(num == 0)num = 4;
}
}
//====================================顯示函數===================================
void display_function()
{
if(flag == 0)//顯示速度
{
switch(point1)
{
case 0:wei = bitcode[num-1];led = display1[buf1[num-1]];num--;break;//速度顯示 0
case 1:if(num == 1){ wei = bitcode[num-1];led = 0x7f&display1[buf1[num-1]];num--;}
else { wei = bitcode[num-1];led = display1[buf1[num-1]];num--;}break;//最高位小數點亮
case 2:if(num == 2){ wei = bitcode[num-1];led = 0x7f&display1[buf1[num-1]];num--;}
else { wei = bitcode[num-1];led = display1[buf1[num-1]];num--;}break;//第二高位小數點亮
case 3:if(num == 3){ wei = bitcode[num-1];led = 0x7f&display1[buf1[num-1]];num--;}
else { wei = bitcode[num-1];led = display1[buf1[num-1]];num--;}break;//第三高位小數點亮
default:break;
}
if(num == 0)num = 4;
}
else if(flag == 1)//顯示里程
{
switch(point2)
{
case 0:wei = bitcode[num-1];led = display1[buf2[num-1]];num--;break;//里程顯示 0
case 1:if(num == 1){ wei = bitcode[num-1];led = 0x7f&display1[buf2[num-1]];num--;}
else { wei = bitcode[num-1];led = display1[buf2[num-1]];num--;}break;//最高位小數點亮
case 2:if(num == 2){ wei = bitcode[num-1];led = 0x7f&display1[buf2[num-1]];num--;}
else { wei = bitcode[num-1];led = display1[buf2[num-1]];num--;}break;//第二高位小數點亮
case 3:if(num == 3){ wei = bitcode[num-1];led = 0x7f&display1[buf2[num-1]];num--;}
else { wei = bitcode[num-1];led = display1[buf2[num-1]];num--;}break;//第三高位小數點亮
default:break;
}
if(num == 0)num = 4;
}
}
//=================================定時器0和外部中斷0的初始化函數=================
void time0_int0_init()
{
TMOD |= 0x01;
TMOD &= 0xfd;//定時器0工作于方式1
TL0 = (65536 - 5000) % 256;//12M晶振，5ms定時
TH0 = (65536 - 5000) / 256;
IT0 = 1;//外部中斷0，負跳變觸發方式
TR0 = 0;
ET0 = 1;
EX0 = 1;
EA = 1;
}
//====================================ms 級延時函數===========================
void delay1m(uchar x)
{
uchar i,j;
for(i=0;i<x;i++) //連數x次，約 x ms
for(j=0;j<120;j++); //數120 次，約1 ms
}

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