51單片機簡易頻率計源代碼

#include

#define uchar unsigned char
#define uint unsigned int

uint ff; //接受頻率值
uchar start=1; //定時器，計數(shù)模式啟動變量

code uchar seg[]={0x28,0x7e,0xa2,0x62,0x74,0x61,0x21,0x7a,0x20,0x60};
code uchar tab[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};

void delay(uint k) //延時函數(shù)
{
while(k--);
}

void show(uint k) //數(shù)值顯示函數(shù)
{
static uchar i,j;
uint ss[5];
i=0;
do
{
ss[i]=k%10;
i++;
}while(k/=10);
for(j=0;j {
P0=seg[ss[j]];
P2=tab[j];
delay(100);
P0=0xff;
P2=0xff;
}
}

void time0_init()
{
TMOD|=0x01; //定時器0 定時模式 計數(shù)范圍65536
TH0=0x3c; //定時初值50ms
TL0=0xb0;
TR0=0; //暫停定時器0
}

void time1_init()
{
TMOD|=0x50; //定時器1 計數(shù)模式，計數(shù)范圍65536
TH1=0; //計數(shù)初值0
TL1=0;
TR1=0;//暫停計數(shù)器
}

void str_init() //定時器中斷
{
EA=1;
ET0=1;
}

void time0_event() interrupt 1
{
static uchar i;
i++;
TH0=0x3c; //定時初值50ms
TL0=0xb0;
if(i==20)
{
i=0;
TR1=0; //停止計數(shù)
TR0=0; //停止定時
ff=(TH1*256+TL1); //求出頻率值 就是1秒內(nèi)脈沖次數(shù)
TH1=0; //計數(shù)值清零
TL1=0;
TH0=0x3c; //定時初值50ms
TL0=0xb0;
start=1; //啟動定時器開啟變量
}
}

void main()
{
time0_init();
time1_init();
str_init();

while(1)
{
if(start==1)
{
TR0=1; //啟動定時器
TR1=1; //啟動計數(shù)器
start=0; //關(guān)閉啟動變量位 保證1秒時間

}
show(ff);
}
}