单片机源程序如下:
- #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;
- }
- }
所有资料51hei提供下载:
基于51单片机和Proteus仿真的简易频率计.zip
(55.02 KB, 下载次数: 122)
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