Microcontroller Projects

interfacing-24x2-lcd-with-microcontroller.c

#include <htc.h>
#define _XTAL_FREQ 20000000
void delay(unsigned int time)  //Time delay function
{
unsigned int i,j;
for(i=0;i< time;i++)
for(j=0;j<5;j++);
}

             //Function for sending values to the command register of LCD
void lcdcmd(unsigned char value)  
{
PORTB=value;
RD6= 0;           //register select-rs 
RD5 = 0;          //read-write-rw
RD7 = 1;          //enable-e
delay(50);
RD7=0;            //enable-e
delay(50);

}
             //Function for sending values to the data register of LCD
void display(unsigned char value)  
{
PORTB=value;
RD6= 1;       //register select-rs 
RD5= 0;       //read-write-rd
RD7= 1;       //enable-e
delay(500);
RD7=0;        //enable-e
delay(50);

}
             //function to initialize the registers and pins of LCD
             //always use with every lcd of hitachi
void lcdint(void)         
{
TRISB=0x00;    //PortB is used as output port             
TRISD5=0;
TRISD6=0;
TRISD7=0; 
delay(15000);display(0x30);delay(4500);display(0x30);delay(300);display(0x30);delay(650);
lcdcmd(0x38);     //Character font made is 5x7 matrix
delay(50);
lcdcmd(0x0C);
delay(50);
lcdcmd(0x01);
delay(50);
lcdcmd(0x06);
delay(50);
lcdcmd(0x80);  //Selects 16x2 lcd coulomb 1 row 1
delay(50);
}

void main()
{

char a,b,c,d;
unsigned int i;
lcdint();
while(1){
c=0x80;d=0xC0;  //Lcd Commands
a='A';b='a';
i=0;
lcdcmd(0x01);  //Clear lcd Command
while(i!=24){
lcdcmd(c);
display(a);    //Displaying upper case letters
a++;
c++;
lcdcmd(d);
display(b);   //Displaying lower case letters 
b++;
d++;
i++;
}
}
}