Mạch đo tần số hiển thị LCD 16x2

Code:
#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

}

}