AVR 1602 LCD character movement-EEWORLD

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#include

#define uchar unsigned char
#define uint unsigned int

uchar str1[16]="This is a ASCII";
uchar str2[16]=" Test ";

#include "1602.h"

void port_init()
{
PORTA=0xff;
DDRA=0xff;
PORTB=0xff;
DDRB=0xff;
PORTD=0xff;
DDRD=0xff;
}

void init()
{
MCUCR=0x0a;
GICR=0xc0;
SREG=0x80;
}

void disline(uchar w) //Character movement function
{
uchar i;
for(i=0;i<16;i++)
{
    displayonechar(i,1,w); //Characters are displayed on the second line, i.e. letters A--Z
    w++;
    if(w>90)w=65; //Character display is limited to A--Z

}
delay(500);
}

void main()
{
uchar w=65;
port_init();
init();
//1602 device initialization
delay(15);
writecmd(0x38);
delay(5);
writecmd(0x38);
delay(5);
writecmd(0x38);
writecmd(0x80);
writecmd(0x01);
writecmd(0x06);
writecmd(0x0c);
delay(500);
//End of initialization

    writecmd(0x01);
    writecmd(0x0c);
    displaychar(0,0,str1);
    delay(1000);
    writecmd(0x01);
    writecmd(0x0c);
    displaychar(0,1,str2);
    delay(1000);
    writecmd(0x01);
    writecmd(0x0c);
while(1)
{
disline(w++);               //字符移动模式
if(w>90)w=65;
}
}

//-----------------1602 library function-----------------------

#define RS PORTB_Bit0
#define RW PORTB_Bit1
#define EN PORTB_Bit2
#define DATA PORTA
#define busy 0x80

[page]
void delay(int k)
{
int i,j;
for(i=0;i {
for(j=0;j<1140;j++);
}
}

void wait()
{
uchar val;
DATA=0xff;
RS=0;
RW=1;
__no_operation();
__no_operation();
EN=1;
__no_operation();
__no_operation();
DDRA=0x00;
val=PINA;
while(val&busy)
{
val=PINA;
}
EN=0;
DDRA=0xff;
}

void writecmd(uchar cmd)
{
wait();
RS=0;
RW=0;
__no_operation();
DATA=cmd;
__no_operation();
EN=1;
__no_operation();
__no_operation();
EN=0;
}

void writedata(uchar data)
{
wait();
RS=1;
RW=0;
__no_operation();
DATA=data;
__no_operation();
EN=1;
__no_operation();
__no_operation();
EN=0;
}

void displayonechar(uchar x,uchar y,uchar dda)
{
y&=0x01;
x&=0x0f;
if(y)x|=0x40;
x|=0x80;
writecmd(x);
writedata(dda);
}

void displaychar(uchar x,uchar y,uchar *p)
{
y&=0x01;
x&=0x0f;
while(*p!='')
{
    if(x<=0x0f)
    {
      displayonechar(x,y,*p);
      p++;
      x++;
    }
}
}

Keywords：AVR Reference address：AVR 1602 LCD character movement

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