Hello

I am having a problem in Calibrating the Frequency Counter.

I’ve used Counter 0 16-bit mode.

And I am actually recording values in TL0 and TH0 as the counter is run as then they are refreshed.
The problem is that TL0 and TH0 gives the values in HEX, and I am not able to implement a formula to calibrate the value, since I cannot multiply or divide the HEX values that I get from the TL0 and TH0.

Please advise me some technique in C-programming on how can I “combine” TH0 and TL0 values to get values in a single variable then how can I multiply an integer to it and then how they can be converted into ASCII to be displayed on the LCD.

I am presently able to convert TL0 and TH0 into ASCII “separately” where I am feeding the LCD, the values in single digits like MSDH (Most Significant Digit for TH) MIDH (Middle Digit for TH) LSDH (Least Significant Digit for TH) MSDL (Most Significant Digit for TL) and so on…..

Please have a look at the C-Code and suggest me to improve it and to solve my problem if possible.

Thank you.

CODE:
#includeltreg51.hgt
sfr ldata = 0×90;
sbit rs=P2^0;
sbit rw=P2^1;
sbit en=P2^2;
sbit busy=P1^7;

void lcdcmd(unsigned char value); //LCD Command Instruction Function Declaration
void lcddata(unsigned char value); //LCD Data Instruction Function Declaration
void MSDelay(unsigned int time); //Delay Function Declaration
void lcdready(); //Busy Flag Function Declaration
void main(void)
{
unsigned char HexL, HexH, name[5]=”Osama”;
unsigned int i, xL, xH, d1L, d1H, d2L, d2H, d3L, d3H, MSDL, MSDH, MIDL, MIDH, LSDL, LSDH;
T0=1;
TMOD=0×05; //counter 0, mode 1 (16 bits)
TL0=0; //set count to zero
TH0=0; //set count to zero
MSDelay(5);
lcdcmd(0×38); //2 lines and 5X7 matrix
lcdcmd(0x0C); //Display ON, Cursor Blinking = 0x0E But this command is Display ON, Cursor OFF
lcdcmd(0×01); //Clear Display Screen
lcdcmd(0×06); //Increament Cursor (Shift Cursor to Right)
lcdcmd(0×86);
for(i=0;ilt5;i++)
lcddata(name[i]);
MSDelay(200);
lcdcmd(0×01);
while(1)
{
do
{
TR0=1;
HexL = TL0; //Loading Value of TL0 in HexL
HexH = TH0; //Loading Value of TH0 in HexH
TL0=0; //Reset TL0
TH0=0; //Reset TH0
xL = HexL / 10; //Code for converting HEX into Decimal for TL0
d1L= HexL % 10; //LSD TL
d2L = xL % 10; //Middle TL
d3L = xL / 10; //MSD TL
xH = HexH / 10; //Code for converting HEX into Decimal for TLH
d1H= HexH % 10; //LSD TH
d2H = xH % 10; //Middle TH
d3H = xH / 10; //MSD TH
LSDL = d1L + 48; //Cconverting Decimal to ASCII
MIDL = d2L + 48;
MSDL = d3L + 48;
LSDH = d1H + 48;
MIDH = d2H + 48;
MSDH = d3H + 48;
lcddata(MSDH);
lcddata(MIDH);
lcddata(LSDH);
lcddata(MSDL);
lcddata(MIDL);
lcddata(LSDL);
lcdcmd(0×10);
lcdcmd(0×10);
lcdcmd(0×10);
lcdcmd(0×10);
lcdcmd(0×10);
lcdcmd(0×10);
MSDelay(200);
}
while(TF0==0);
TR0=0;
TF0=0;
}
}

void lcdcmd(unsigned char value)
{
lcdready();
ldata=value;
rs=0;
rw=0;
en=1;
MSDelay(1);
en=0;
return;
}
void lcddata(unsigned char value)
{
lcdready();
ldata=value;
rs=1;
rw=0;
en=1;
MSDelay(1);
en=0;
return;
}
void lcdready()
{
busy=1;
rs=0;
rw=1;
while(busy==1)
{
en=0;
MSDelay(1);
en=1;
}
return;
}
void MSDelay(unsigned int time)
{
unsigned int i,j;
for(i=0;ilttime;i++)
for(j=0;jlt1275;j++);
}