#include"LCD.h"
void setup() {
  volatile char FL = 0xc0,str[]="welcome",size=7; // word and size
  volatile int mode=0;
  init_port();
  lcd_Display_Mode(mode); // 8 bit mode =0 or 4 bit mode =1
  Display_ON_Cursor_off(); //  display on cursor off
  display_clear(); //clear lcd data
  AutoDecrement(); //auto increment
  while (1)
  {
  DLP_right_To_left(str,size);// displaying " Welcome from left to right"
  }
}
void loop() {
}

sketch.ino

diagram.json

void init_port(void);
void outdata(char);
void outcontrol(char);
void delay1(int);
void Lcd_control_write(void);
void init_Lcd(void);
void write_data(char);
void init_port()
{
  volatile char* portf_dir = (volatile char*)0x30;
  volatile char* portk_dir = (volatile char*)0x107;
  *portf_dir = 0xff;
  *portk_dir = 0x03;
}
void outdata(char out_data)
{
  volatile char* portf_data = (volatile char*)0x31;
  *portf_data = out_data;
}
void write_string(char *ptr)
{
  for(volatile int i=0;ptr[i]!=0;i++)
  {
    write_data(ptr[i]);
  }
}
void outcontrol(char out_data)
{
  volatile char *portk_data = (volatile char*)0x108;
  *portk_data = out_data;
}
void Lcd_control_write(void)
{
  outcontrol(0x01);
  delay(1);
  outcontrol(0x00);
  delay(1);
}
void init_Lcd(void)
{
  outdata(0x38); //8bit 2 line
  Lcd_control_write();
  outdata(0x0f);   //  display on cursor blinking
  Lcd_control_write();
  outdata(0x01); // clear data
  Lcd_control_write();
  outdata(0x06);//auto increment
  Lcd_control_write();
  outdata(0x84); //8bit 2 line
  Lcd_control_write();
}
void write_data(char wr_data)
{
  outdata(wr_data);
  outcontrol(0x02);
  delay(1);
  outcontrol(0x03);
  delay(1);
  outcontrol(0x02);
  delay(1);
}
void display_clear()
{
  outdata(0x01);
      Lcd_control_write();
}
void lcd_Display_Mode(char i)
{
  if(i==0)
  {
   outdata(0x38); //8bit 2 line
  Lcd_control_write();
  }
  else
  {
    outdata(0x28); //4bit 2 line
  Lcd_control_write();
  }
}
void DLP_left_To_Right(char *chr,char size)
{
  char dec,FL=0x80,flag=1,c;
  for(volatile char j=0;j<(size*2+8);j++)
  {
  display_clear();
      outdata(FL); //8bit 2 line
      Lcd_control_write();
      if(j!=(size) && flag==1)
    {
      FL=0x80;
     outdata(FL); //8bit 2 line
      Lcd_control_write();  
           c=j;
         for(volatile char i=(size-1-c);c>=0;i++,c--)
                {
                   write_data(chr[i]);
               } 
         if(j>=(size-1))
               {
                flag=0;
               }
    }
    else
    {
  for(volatile char i=0;i<size;i++)
  {
    write_data(chr[i]);
  } 
    }
  delay(250);
 display_clear();
 FL++;
  }
}
void DLP_right_To_left(char *chr,char size)
{
  char FL=0x8f,count=0;
  for(volatile char j=0;j<(size*2+2);j++)
  {
  display_clear();
      outdata(FL); //8bit 2 line
      Lcd_control_write();
  for(volatile char i=0;i<size;i++)
  {
    write_data(chr[i]);
  }
  delay(250);
 display_clear();
 FL--;
  }
  //display_clear();
  FL=0x80;
  outdata(FL); //8bit 2 line
  Lcd_control_write();
  for(volatile char j=0;j<size;j++)
  {
    display_clear();
    outdata(FL); //8bit 2 line
  Lcd_control_write();
  for(volatile char i=j+1;i<size;i++)
  {
      write_data(chr[i]);
  }
  delay(250);
 display_clear();
  }

  
}
void Display_ON_Cursor_blink()
{
  outdata(0x0f);   //  display on cursor blinking
  Lcd_control_write();
}
void Display_ON_Cursor_off()
{
  outdata(0x0c);   //  display on cursor blinking
  Lcd_control_write();
}
void AutoIncrement()
{
   outdata(0x06);//auto increment
  Lcd_control_write();
}
void AutoDecrement()
{
   outdata(4);//auto increment
  Lcd_control_write();
}
