code with c to measure the value of frequency problem

[ecestar]

code with c

can any one helpe me i write cde with c language to measure the value of frequency wich input to the microcontroller and display character to each value by using lcd.

the prpblem is when i put constant frequency that input the 8051 then i have

on the lcd many caracter for each time .

can any one help me please and this is my code


/*---------------------------------------------------------*/
#include <reg66x.h>
#include <reg52.h>
#include <stdio.h>
#define NewLine 0xc0
#define ClrDisp 0x01
#define TwoLine10dots 0x38
#define ScrOnCurOffBlinkOff 0x0F
#define IncCurDntMovDis 0x06
#define OUT P1

int check ;
sbit BusyFlag=P1^7;
sbit RS =P3^5;
sbit RW =P3^6;
sbit E =P3^7;

/*---------------------------------------------------------
Timer 0 Overflow Interrupt
---------------------------------------------------------*/
unsigned long tt ;
unsigned long t;

void T0_ISR (void) interrupt 1
{

TF0 = 0; // Reset the interrupt request

}


/*---------------------------------------------------------
MAIN C function
---------------------------------------------------------*/

/*---------------------------------------------------------
---------------------------------------------------------*/
int temp(){
int x,y;
y=tt/335;
x=y+31;
return x;
}





void checkBusy(void){


OUT=0XFF ;
do{ ;
E =0;
RS =0;
RW =1;
E =1;
}while(BusyFlag);
E=0;
RW = 0;
}

void sendCmd (unsigned char Cmd){
checkBusy();
RS = 0;
RW = 0;

OUT = Cmd;
E =1;
E =0;
}
void sendData (unsigned char ch){
checkBusy();
RS = 1;
RW = 0;
OUT=ch;
E = 1;
E = 0;
}
void init_LCD (void){
sendCmd(TwoLine10dots);
sendCmd(ScrOnCurOffBlinkOff);
sendCmd(IncCurDntMovDis);

}



void main (void)
{
int a;
/*--------------------------------------
Set serial port for 9600 baud at
11.0592 MHz. Note that we use Timer 1
for the baud rate generator.
--------------------------------------*/
SCON = 0x53;
PCON =0x00;
TH1 = 0xFA;
TL1 = 0xFA;
TR1 = 1;
TI = 1 ;

/*--------------------------------------
Enable interrupts for timer 0.
--------------------------------------*/
ET0 = 1;
EA = 1;

/*--------------------------------------
Set Timer0 for 16-bit interval timer
mode.
--------------------------------------*/
TMOD = 0x21;

while (1)
{
/*--------------------------------------
Clear the timer overflow counter and
the timer low and high registers. Then,
start the timer.
--------------------------------------*/
TH0 = 0;
TL0 = 0;
TR0 = 1;


/*--------------------------------------
Wait for the pulse to start.
Then, wait for the pulse to end.
--------------------------------------*/
while (!INT0);
while (INT0);

/*--------------------------------------
Compute the width of the pulse -- one
clock cycle is 1us for a standard 8051
and display it.
--------------------------------------*/
tt=((unsigned long)(TH0*256)+TL0) ;
printf ("%1d\n",tt=(unsigned long)(TH0*256)+TL0) ;

a=temp();
if (a==32){
init_LCD();
sendCmd(ClrDisp);
sendData('A');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==33){
init_LCD();
sendCmd(ClrDisp);
sendData('b');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==34){
init_LCD();
sendCmd(ClrDisp);
sendData('c');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==35){
init_LCD();
sendCmd(ClrDisp);
sendData('d');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==36){
init_LCD();
sendCmd(ClrDisp);
sendData('e');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==37){
init_LCD();
sendCmd(ClrDisp);
sendData('f');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==38){
init_LCD();
sendCmd(ClrDisp);
sendData('g');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==39){
init_LCD();
sendCmd(ClrDisp);
sendData('h');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==40){
init_LCD();
sendCmd(ClrDisp);
sendData('i');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else if (a==41){
init_LCD();
sendCmd(ClrDisp);
sendData('j');
sendCmd(NewLine);
for(t=0;t<1000;t++){}
}
else {


// for(t=0;t<10000000;t++){}

}







// for(t=0;t<10000;t++);




}
}

 

[madicalphy]

frequency counter and led display of counts , for further information
**broken link removed**