#include <AT89X52.H>
unsigned char code dispbit[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; //P2的扫描位
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07,0x7f,0x6f,0x00,0x40}; //数码管的字形编码
unsigned char dispbuf[8]={0,0,0,0,0,0,10,10}; //初始化显示值
unsigned char temp[8]; //存放显示的数据
unsigned char dispcount; //显示计数器值
unsigned char T0count; //T0的计数器值
unsigned char timecount; //计时计数器值
bit flag; //标志位
unsigned long x; //频率值
//频率计算函数
void HzCal(void)
{
unsigned char i;
x=T0count*65536+TH0*256+TL0; //得到T0的16位计数器值
for(i=0;i<8;i++)
{
temp[i]=0;
}
i=0;
while(x/10) //拆分
{
temp[i]=x%10;
x=x/10;
i++;
}
temp[i]=x;
for(i=0;i<6;i++) //换算为显示数据
{
dispbuf[i]=temp[i];
}
timecount=0;
T0count=0;
}
void main(void)
{
TMOD=0x15; //设置定时器工作方式
TH0=0;
TL0=0;
TH1=(65536-5000)/256;
TL1=(65536-5000)%256; //初始化T1
TR1=1;
TR0=1;
ET0=1;
ET1=1;
EA=1; //开中断
while(1)
{
if(flag==1)
{
flag=0;
HzCal(); //频率计算函数
TH0=0;
TL0=0;
TR0=1;
}
}
}
//定时器T0中断服务子函数
void t0(void) interrupt 1 using 0
{
T0count++;
}
//定时器T1中断服务子函数
void t1(void) interrupt 3 using 0
{
TH1=(65536-5000)/256;
TL1=(65536-5000)%256; //初始化T1预装值，1ms定时
timecount++; //扫描
if(timecount==200) //秒定时
{
TR0=0; //启动T0
timecount=0;
flag=1;
}
P2=0xff; //初始化选择引脚
P0=dispcode[dispbuf[dispcount]]; //输出待显示数据
P2=dispbit[dispcount];
dispcount++; //切换到下一个选择引脚
if(dispcount==8) //如果已经扫描完成切换
{
dispcount=0;
}
}
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