frequency.c

基于51单片机的数字频率计

#include<regx52.h>
#include<intrins.h>
#define uint unsigned int 
#define uchar unsigned char
unsigned char code dispbit[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};//共阴数码管
unsigned char code dispcode[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//显示0-9
unsigned char count[8]={0,0,0,0,0,0,0,0};
unsigned int T0count=0;
unsigned char  time1tick=0;
unsigned char i=0;
unsigned long  x;//该开始定义unsigned int，结果超出了范围，因为int的最大是65536
void pulse_init(void)
{
	TMOD=0x16;//T0工作在方式2，计数器模式
	TH0=0x00;
	TL0=0x00;
	TH1=0xb1;//20ms中断一次
	TL1=0xe0;
	ET0=1;
	ET1=1;
	EA=1;

}
void delay(uint ms)
{
	unsigned char i,j;
	for(i=0;i<ms;i++)
		for(j=0;j<250;j++)
		{
			_nop_();
			_nop_();
			_nop_();
			_nop_();
		}
}
static void time0_int(void) interrupt 1 using 0
{

	T0count++;	//T0为计数器模式
}

void t1(void) interrupt 3 using 0
{	

		time1tick++;
		TH1=0xb1;//20ms中断一次
		TL1=0xe0;
		if(time1tick==50)//定时1s
		{
		    time1tick=0;
			TR0=0;
			TR1=0;//T1为定时器模式
			EA=0;
		}   
	
	
}

void display(void)
{
	  	x=256*T0count+TL0;	//转换成10进制
		i=7;//数码管的显示高位表示数据的低位
		while(x)//赋值
		{
			count[i]=x%10;
			x=x/10;
			i--;
		}
			count[i]=x;
		for(i=0;i<8;i++)
		{
		  	P0=dispbit[i];
			P1=dispcode[count[i]];
			delay(1);
		}
}
void main()
{
		pulse_init();
		TR1=1;//开启timer
		TR0=1;
		while(1)display();
}