Hi there,
I am new to c programming and I am current studying the example codes. I am having difficulty to understand the line . I wish to know what does this line meas and what will it done.
Here is the full codes:
Code:
//Program to interface IR sensor using ADC 0804. Set Vref =1.5v for ADC 0804
#include<reg51.h>
#define port P3
#define adc_input P1
#define dataport P0
#define sec 100
sbit rs = port^0;
sbit rw = port^1;
sbit e = port^2;
sbit wr= port^3;
sbit rd= port^4;
sbit intr= port^5;
int test_final=0 ,shift=0;
void delay(unsigned int msec ) // Time delay function
{
int i ,j ;
for(i=0;i<msec;i++)
for(j=0; j<1275; j++);
}
void lcd_cmd(unsigned char item) // Function to send command to LCD
{
dataport = item;
rs= 0;
rw=0;
e=1;
delay(1);
e=0;
return;
}
void lcd_data(unsigned char item) // Function to send data to LCD
{
dataport = item;
rs= 1;
rw=0;
e=1;
delay(1);
e=0;
return;
}
void lcd_data_string(unsigned char *str) // Function to send string to LCD
{
int i=0;
while(str[i]!='\0')
{
lcd_data(str[i]);
i++;
delay(1);
}
return;
}
void convert()
{
int s;
lcd_cmd(0x81);
delay(2);
lcd_data_string("output:");
s=test_final/100;
test_final=test_final0;
lcd_cmd(0x8a);
if(s!=0)
lcd_data(s+48);
else
lcd_cmd(0x06);
s=test_final/10;
test_final=test_final;
lcd_data(s+48);
lcd_data(test_final+48);
lcd_data(' ');
if(shift>16)
{
lcd_cmd(0xc0+(shift-1));
lcd_data_string(" ");
shift=0;
}
lcd_cmd(0xc0+(shift-1));
lcd_data(' ');
lcd_cmd(0xc0+shift);
lcd_data_string("CALIBRATE IT");
delay(30);
}
void main()
{
adc_input=0xff;
lcd_cmd(0x38); //2 Line, 5X7 Matrix
lcd_cmd(0x0c); //Display On, Cursor Blink
delay(2);
lcd_cmd(0x01); // Clear Screen
delay(2);
lcd_cmd(0x81); // Setting cursor to first position of first line
delay(2);
while(1)
{
shift++;
delay(1);
rd=1;
wr=0;
delay(1);
wr=1;
while(intr==1);
rd=0;
test_final=adc_input;
delay(1);
intr=1;
convert();
}
}
Please guide me through and I will appreciate it very much.