AVRFreaks.net

PIN 1 = GND = 5 V COMON
PIN 2 = Vcc = +5 VDC
PIN 3 = Vee = CONTRAST POT SLIDER

PIN 4 = PORTB:0 = RS
PIN 5 = PORTB:1 = R/W
PIN 6 = PORTB:2 = E

PIN 7 = PORTA:0 = DB0
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PIN 14 = PORTA:7 = DB7

#define F_CPU 80000000

// Data: PORTD
// Control: PORTC
// RS = PORTC, bit 0, 0x01
// RW = PORTC, bit 1, 0x02
// E = PORTC, bit 2, 0x04

#include <avr/io.h>
#include <util/delay.h>

// Define LCD Register Select as PORTC, 0x01;
#define LCD_RS 0
// Define LCD Read/Write as PORTC, 0x02;
#define LCD_RW 1
// Define LCD Enable as PORTC, 0x04;
#define LCD_E 2   

// TURN ON POWER TO THE DISPLAY, NO CURSOR
#define   PWR_CMD   0x3F
// SET 2 LINE, 8 DATA BIT MODE     
#define   DL_CMD   0x0F
// CLEAR DISPLAY COMMAND     
#define CLR_DSP 0x01

#define LINE1 0x80
#define LINE2 0x80


#define NULL 0x00

const char BANNER_1[] = {"Having Fun"};
const char BANNER_2[] = {"With LCD's"};

void LCD_Delay (unsigned long int d);
void LCD_IO_INIT (void);
void LCD_INIT (void);
void LCD_PutCmd (char);
void LCD_PutChar (char);
void LCD_PutString (const char *);

void main (void) {
   LCD_IO_INIT ();
   LCD_INIT ();
   
   while(1)
   {
       // Add other LCD related program operations here...
   }         
}

void LCD_Delay (unsigned long int d)
{
    unsigned long int n;
    for (n = 0; n < d; n++);
}

void LCD_IO_INIT (void)
{
    DDRD = 0xFF; // PORTD is the LCD DATA LINES
    PORTD = 0x00;
    DDRC |= 0x07; // PORTC is the LCD CONTROL LINES
    PORTC |= 0x05; // LCD_E = HIGH, LCD_RW = LOW, LCD_RS = HIGH
    LCD_Delay (500); // Wait for the up LCD to power up         
}

void LCD_INIT (void)
{
    LCD_PutCmd (PWR_CMD); // Power up the display
    LCD_PutCmd (DL_CMD);  // Set to 2 lines, 8 bit, no cursor
    LCD_PutCmd (CLR_DSP); // Clear the display
    LCD_Delay (500); // Wait for the LCD to boot up   
   
   LCD_PutCmd (LINE1+5);
   LCD_PutString (BANNER_1);
   LCD_PutCmd (LINE2+5);
   LCD_PutString (BANNER_2);
}
 
void LCD_PutCmd (char c)
{
  PORTC &= ~(1<<LCD_RS);
  LCD_Delay (5); // Wait for the proper setup time to respond to the RS control line
  LCD_PutChar(c);
  LCD_Delay (5); // Wait for the proper setup time to respond to the command being applied
  PORTC |= (1<<LCD_RS);
}

void LCD_PutChar (char c)
{
    PORTC |= (1<<LCD_E);
    LCD_Delay (5); // Wait for the proper setup time to respond to the E pulse   
    PORTD = c;
    LCD_Delay (5); // Wait for the proper setup time to respond to the character being applied
    PORTC &= ~(1<<LCD_E);
}
 
void LCD_PutString (const char *p)
{
    char n = NULL; // Pointer position counter.
    while (p[n] != NULL) // Keep sending data until the NULL character is found.
         LCD_PutChar(p[n++]);
}

// TURN ON POWER TO THE DISPLAY, NO CURSOR
#define   PWR_CMD   0x0C
// SET 8 DATA BIT MODE       
#define   DL_CMD   0x30
// CLEAR DISPLAY COMMAND       
#define CLR_DSP 0x01

#define F_CPU 8000000

#define LINE1 0x80
#define LINE2 0xC0

void LCD_PutCmd (char c)
{
  PORTC &= ~(1<<LCD_RS);
  LCD_Delay (5); // Wait for the proper setup time to respond to the RS control line
  LCD_PutChar(c);
  LCD_Delay (5); // Wait for the proper setup time to respond to the command being applied
  PORTC |= (1<<LCD_RS);
}

void LCD_PutCmd (char c)
{
  PORTC &= ~(1<<LCD_RS);
  LCD_Delay (200); // Wait for the proper setup time to respond to the RS control line
  LCD_PutChar(c);
  LCD_Delay (200); // Wait for the proper setup time to respond to the command being applied
  PORTC |= (1<<LCD_RS);
  LCD_Delay (200);
}

void LCD_PutChar (char c)
{
    PORTC |= (1<<LCD_E);
    LCD_Delay (5); // Wait for the proper setup time to respond to the E pulse   
    PORTD = c;
    LCD_Delay (5); // Wait for the proper setup time to respond to the character being applied
    PORTC &= ~(1<<LCD_E);
    LCD_Delay (5); // Wait for the proper setup time
}