利用，红外-霍尔传感测速，4位数码管显示测速-89C51-含C语言及汇编程序-制作 DIY - 圣源电子制作

#include <REG52.H>
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
#define LED_DAT P0
sbit LED_SEG0 = P2^7;
sbit LED_SEG1 = P2^6;
sbit LED_SEG2 = P2^5;
sbit LED_SEG3 = P2^4;
#define TIME_CYLC 100 //12M晶振，定时器10ms 中断一次我们1秒计算一次转速 // 1000ms/10ms = 100
#define PLUS_PER 10 //码盘的齿数，这里假定码盘上有10个齿，即传感器检测到10个脉冲，认为1圈
#define K 1.65 //校准系数
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar data Disbuf[4];// 显示缓冲区
uint Tcounter = 0; //时间计数器
bit Flag_Fresh = 0; // 刷新标志
bit Flag_clac = 0; //计算转速标志
bit Flag_Err = 0; //超量程标志
void DisplayFresh();//在数码管上显示一个四位数
void ClacSpeed();//计算转速，并把结果放入数码管缓冲区
void init_timer();//初始化定时器T0\T1
void Delay(uint ms);//延时函数
void it_timer0() interrupt 1 /* interrupt address is 0x000b */
{
TF0 = 0; //定时器 T0用于数码管的动态刷新
TH0 = 0xC0;
TL0 = 0x00;
Flag_Fresh = 1;
Tcounter++;
if(Tcounter>TIME_CYLC)
{ Flag_clac = 1;//周期到，该重新计算转速了
}
}
void it_timer1() interrupt 3 /* interrupt address is 0x001b */
{
TF1 = 0; //定时器T1用于单位时间内收到的脉冲数
//要速度不是很快，T1永远不会益处
Flag_Err = 1; //如果速度很高，我们应考虑另外一种测速方法：T测速法
}
void main(void)
{
Disbuf[0] = 0; //开机时，初始化为0000
Disbuf[1] = 0;
Disbuf[2] = 0;
Disbuf[3] = 0;
init_timer();
while(1)
{
if(Flag_Fresh)
{ Flag_Fresh = 0;
DisplayFresh(); // 定时刷新数码管显示
}
if(Flag_clac)
{ Flag_clac = 0;
ClacSpeed(); //计算转速，并把结果放入数码管缓冲区
Tcounter = 0;//周期定时清零
TH1=TL1 = 0x00;//脉冲计数清零
}
if(Flag_Err) //超量程处理
{
Disbuf[0] = 0x9e; //开机时，初始化为0000
Disbuf[1] = 0x9e;
Disbuf[2] = 0x9e;
Disbuf[3] = 0x9e;
while(1)
{ DisplayFresh();//不再测速等待复位i
}
}
}
}
//在数码管上显示一个四位数
void DisplayFresh()
{
P2 |= 0xF0;
LED_SEG0 = 0;
LED_DAT = table[Disbuf[0]];
Delay(1);
P2 |= 0xF0;
LED_SEG1 = 0;
LED_DAT = table[Disbuf[1]];
Delay(1);
P2 |= 0xF0;
LED_SEG2 = 0;
LED_DAT = table[Disbuf[2]];
Delay(1);
P2 |= 0xF0;
LED_SEG3 = 0;
LED_DAT = table[Disbuf[3]];
Delay(1);
P2 |= 0xF0;
}
//计算转速，并把结果放入数码管缓冲区
void ClacSpeed()
{
uint speed ;
uint PlusCounter;
PlusCounter = TH1*256 + TL1;
speed =6*PlusCounter/K; //K是校准系数，如速度不准，调节K的大小
Disbuf[3] = (speed/1000)%10;
Disbuf[2] = (speed/100)%10;
Disbuf[1] = (speed/10)%10;
Disbuf[0] = speed%10;
}
void init_timer()//初始化定时器T0\T1
{
TMOD=0x51; //定时器0工作于定时方式1,定时器1工作于计数方式
TH0=(65536-10000)/256;
TL0=(65536-10000)%256; //TO定时时间为10000个周期即10毫秒
TH1=0x00;
TL1=0x00;
ET0=1; /* enable timer0 interrupt */
EA=1; /* enable interrupts */
TR0=1; /* timer0 run */
ET1=1; /* enable timer1 interrupt */
EA=1; /* enable interrupts */
TR1=1;
}
//延时函数
void Delay(uint ms)
{
uchar i;
while(ms--)
for(i=0;i<100;i++);
}

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