codelcd.txt

Code LCD display on ATmega1281

//ICC-AVR application builder : 5/4/2008 12:00:17 AM
// Target : M128
// Crystal: 8.0000Mhz

#include <iom128v.h>
#include <macros.h>

#define Setb_RS() PORTB |= 0x01 
#define Clrb_RS() PORTB &= 0xFE
#define Setb_RW() PORTB |= 0x02 
#define Clrb_RW() PORTB &= 0xFD
#define Setb_EN() PORTB |= 0x04 
#define Clrb_EN() PORTB &= 0xFB
#define LCD_DATA   PORTB

void port_init(void)
{
PORTA = 0x00;
DDRA  = 0x00;
PORTB = 0x00;
DDRB  = 0xFF;
PORTC = 0x00; //m103 output only
DDRC  = 0x00;
PORTD = 0x00;
DDRD  = 0x00;
PORTE = 0x00;
DDRE  = 0x00;
PORTF = 0x00;
DDRF  = 0x00;
PORTG = 0x00;
DDRG  = 0x00;
}

//TIMER0 initialize - prescale:32
// WGM: Normal
// desired value: 1KHz
// actual value:  1.000KHz (0.0%)
void timer0_init(void)
{
TCCR0 = 0x00; //stop
ASSR  = 0x00; //set async mode
TCNT0 = 0x06; //set count
OCR0  = 0x00;
TCCR0 = 0x03; //start timer
}

void delay(unsigned int time)
{
unsigned char i;
for(;time>0;time--) 
{
    for(i=0;i<65;i++)
        asm("NOP");
} 
}

void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
XDIV  = 0x00; //xtal divider
XMCRA = 0x00; //external memory
port_init();
timer0_init();

MCUCR = 0x00;
EICRA = 0x00; //extended ext ints
EICRB = 0x00; //extended ext ints
EIMSK = 0x00;
TIMSK = 0x01; //timer interrupt sources
ETIMSK = 0x00; //extended timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialized
}

void LCD_DAT(unsigned char data)
{
    LCD_DATA &= 0x0F;
    LCD_DATA |= (data<<4);
}

void LCD_Init(void)
{
    delay(10000);       //Wait for more than 30mS

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x02);
    Setb_EN();
    delay(10);
    Clrb_EN();

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x02);
    Setb_EN();
    delay(10);
    Clrb_EN();

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x0F);
    Setb_EN();
    delay(10);
    Clrb_EN();

    delay(1000);       //Wait for more than 39uS

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x00);
    Setb_EN();
    delay(10);
    Clrb_EN();

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x0C);       //0x0F
    Setb_EN();
    delay(10);
    Clrb_EN();

    delay(1000);       //Wait for more than 39uS

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x00);
    Setb_EN();
    delay(10);
    Clrb_EN();

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x01);
    Setb_EN();
    delay(10);
    Clrb_EN();

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x00);
    Setb_EN();
    delay(10);
    Clrb_EN();

    Clrb_RS();
    Clrb_RW();
    LCD_DAT(0x06);
    Setb_EN();
    delay(10);
    Clrb_EN();
    
    delay(100);
}

void LCD_Write(unsigned char address, unsigned char data)
{
    address |= 0x80;
    Clrb_RS();
    delay(1);
    Clrb_RS();
    delay(1);
    Clrb_RW();
    delay(1);
    Clrb_EN();
    
    LCD_DAT(address>>4);
    delay(1);
    Setb_EN();
    delay(1);
    Clrb_EN();
    
    LCD_DAT(address);        //LCD_DATA = address;
    delay(1);
    Setb_EN();
    delay(1);
    Clrb_EN();
    
    Clrb_RS();
    delay(1);
    Setb_RS();
    delay(1);
    Clrb_RW();
    delay(1);
    Clrb_EN();
    
    LCD_DAT(data>>4);
    delay(1);
    Setb_EN();
    delay(1);
    Clrb_EN();
    
    LCD_DAT(data);
    delay(1);
    Setb_EN();
    delay(1);
    Clrb_EN();
}

#pragma interrupt_handler timer0_ovf_isr:17
void timer0_ovf_isr(void)
{
    static unsigned U=0;
    static unsigned H=0;
    static unsigned M=0;
    static unsigned S=0;
    
    U++;
    if(U==1000)
    {
         U = 0;
        PORTB = ~PORTB;
        
        LCD_Write(64,(H%100)/10+48);
        LCD_Write(65,(H%10)+48);
        LCD_Write(66,':');
        LCD_Write(67,(M%100)/10+48);
        LCD_Write(68,(M%10)+48);
        LCD_Write(69,':');
        LCD_Write(70,(S%100)/10+48);
        LCD_Write(71,(S%10)+48);
        
        S++;
        if(S==60)
        {
             S = 0;
            M++;
            if(M==60)
            {
                 M = 0;
                H++;
                if(H==24)
                     H = 0;
            }
        }
    }
}

void main(void)
{
    init_devices();
    LCD_Init();
         
    LCD_Write(0,'R');
    LCD_Write(1,'E');
    LCD_Write(2,'A');
    LCD_Write(3,'L');
    LCD_Write(4,' ');
    LCD_Write(5,'T');
    LCD_Write(6,'I');
    LCD_Write(7,'M');
    LCD_Write(8,'E');
    LCD_Write(9,' ');
    LCD_Write(10,'8');
    LCD_Write(11,'.');
    LCD_Write(12,'0');
    LCD_Write(13,'0');
    LCD_Write(14,'M');
    LCD_Write(15,'H');
    /*
    LCD_Write(64,'A');
    LCD_Write(65,'T');
    LCD_Write(66,'M');
    LCD_Write(67,'E');
    LCD_Write(68,'G');
    LCD_Write(69,'A');
    LCD_Write(70,'1');
    LCD_Write(71,'2');
    LCD_Write(72,'8');
    LCD_Write(73,'-');
    LCD_Write(74,'S');
    LCD_Write(75,'D');
    LCD_Write(76,'K');
    LCD_Write(77,'V');
    LCD_Write(78,'1');
    LCD_Write(79,'0');
    */
    while(1)
    {
    }
}