电子测量 频率计实验

实验目的：掌握频率与周期的测量数字方法 了解频率计的基本结构与设计方法

用51单片机设计的简易频率电路图

实验主程序： #include #include \"LCD1602.h\" sbit CLR = P3^0; sbit FGT = P3^1; sbit f = P3^2;

unsigned char TempBuffer[12];

void IntToStr(unsigned int t, unsigned char *str, unsigned char n) {

unsigned char a[5]; char i, j;

a[0]=(t/10000)%10; //取得整数值到数组 a[1]=(t/1000)%10; a[2]=(t/100)%10; a[3]=(t/10)%10; a[4]=(t/1)%10;

for(i=0; i<5; i++) //转成ASCII码 a[i]=a[i]+'0';

for(i=0; a[i]=='0' && i<=3; i++); for(j=5-n; jfor(; i<5; i++) { *str=a[i]; str++; } //加入有效的数字 *str='\\0'; }

void Delay1ms(unsigned int count) {

unsigned int i,j; for(i=0;iunsigned int Count = 0; long Freq = 0;

void cn() interrupt 3 //计数器中断，测量闸门时间内的计数值 {

Count++; }

void Timer() interrupt 1 //定时中断，产生闸门时间 {

static unsigned char temp = 0; TH0 = 0x3c; TL0 = 0xe3; Freq--;

if (++temp==10) {

FGT = 0; //关闭闸门 Freq = 65536L*256L*Count + 256L*(TH1*256+TL1)+P1; //频率计算 Freq *=2; TH1 = TL1= 0; Count =0; temp =0; CLR = 1; CLR = 0;

FGT = 1; //打开闸门 TH0 = 0x3c; TL0 = 0xb8; } }

void ini() //定时计数器初始化程序 {

TMOD = 0x51; TH0 = 0x3c; TL0 = 0; TH1 = 0; TL1 = 0; TR1 = 1; ET1 = 1; TR0 = 1; ET0 = 1; EA = 1; }

void main() {

LCD_Initial(); GotoXY(0,0);

Print(\"The 1602LCD Test\"); GotoXY(0,1);

Print(\"Freq: Hz\"); ini(); CLR=0; while(1) {

IntToStr(Freq,&TempBuffer[0],5); GotoXY(5,1);

Print(&TempBuffer[0]); Delay1ms(100); } }

//液晶显示初始化//显示数据转换 / /显示频率