#include <reg51.H>
#include"LCD1602.h"
//--------------------------
//5 lcd display Frequency Meter
//--------------------------
//--------------------------------------------------
//Fixed function declaration
void int_0(); //External Interrupt 0
void int_1(); //External Interrupt 1
void t0(); //Timer Interrupt 1
void t1(); //Timer 2 interrupt
void serial_1(); //Serial interrupt 1
void serial_2(); //Serial interrupt 2
//---------------------------------------------------
//User function declaration
void initial(); //Initialization
void IntToStr(unsigned long t, unsigned char *str);//Data conversion mode
void Delay1ms(unsigned int num); //Delay Module
//---------------------------------------------------
//-------------------------------------------------------------------------------------------------------
//Signal and data declarations
unsigned char timecount=0; //Gate count
unsigned char T0count; //Counter overflow count
sbit Gate=P3^1; //Gate output
sbit Clr=P3^7; //Clear signal
unsigned long x; //Frequency count container 1
bit flag=0; //Gate marks the end of
unsigned char TempBuffer[10];//Data buffer
//---------------------------------------------------------------------------------------------------------
void main(void)
{
initial();
Gate=1; //Gate opening
Clr=1; //First clear 74LS393
LCD_Initial(); //lcd initialization
GotoXY(0,0); //Point to 0 rows 0
Print(" Frequency Meter");
GotoXY(0,1);
Print(" Hz");
while(1)
{
Clr=0;
if(flag)
{
flag=0;
IntToStr(x,TempBuffer); //Numeric conversion
GotoXY(0,1); //Locate
Print(TempBuffer); //Print data
TR0=1;
}
}
}
void initial() //Initialization
{
TMOD=0x15;
TH0=0; //Counter to pay the initial value
TL0=0; //Counter to pay the initial value
TH1=0x3b; //Timer initial payment
TL1=0xb0; //Timer initial payment
TR1=1; //Timer start
TR0=1; //Counter Start
ET0=1; //Interrupt counter open
ET1=1; //Open timer interrupt
EX1=1; // INT1 disconnect
IT1=0; // INT1 trigger low (compared to a falling edge trigger)
EA=1; //Open break
return;
}
void IntToStr(unsigned long t, unsigned char *str)
{
unsigned char a[10]; char i,length;
while(t/10) //The count value is converted to digital code values of pipe sections
{
a[i]=t%10;
t=t/10;
i++;
}
a[i]=t;
length=i+1;
for(i=0; i<length; i++) //Converted to ASCII code
a[i]=a[i]+'0';
//for(i=0; a[i]=='0' && i<=6; i++);
//for(j=8-n; j<i; j++) //Fill spaces
// { *str=' '; str++; }
for(i=length-1; i>=0; i--)
{ *str=a[i]; str++; } //Adding the number of effective
*str='\0';
}
void int_1() interrupt 2 using 1 //INT1 interrupt generated from the P3.1 pin
{
T0count=0; //Clear high count
flag=1;
TH0=0; //Counter clear
TL0=0;
}
void t0(void) interrupt 1 using 0 //Counter interrupt service routine
{
T0count++;
}
void t1(void) interrupt 3 using 0 //Timer overflow interrupt program
{
TH1=0x3b; //Initial reset
TL1=0xb0;
timecount++;
if(timecount==20)
{
TR0=0; //Stop counter
x=(T0count*65536+TH0*256+TL0)*255+P1;//Take the count
Clr=1; //Produce clear signal
timecount=0; //Count clear timer
Gate=!Gate; //Invert gate
}
}
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