#include"header.h"

void setup() {
  init_port(); // portf & K are initialized in header file
  init_lcd();// lcd configured
  write_string("welcome!");
}
void loop(){
  
}

sketch.ino

diagram.json

void init_port(void);
void init_lcd(void);
void outconf(char);
void lcd_control(void);
void outpul(char);
void Delay(int);
void write_string(char);
void write_data(char);

void init_port(){ //portf & k direction registers are initialized
  volatile char *dirf=(volatile char *)0x30;
  volatile char *dirk=(volatile char *)0x107;
  *dirf = 0xFF;*dirk = 0x03;
}
void init_lcd(void){ //lcd configuration
  outconf(0x38); //function set
  lcd_control();
  outconf(0x0F); //display controls
  lcd_control();
  outconf(0x01); //clear display
  lcd_control();
  outconf(0x06); // Entry mode set
  lcd_control();
}
void outconf(char out_data){ //portf data register control
  volatile char *outf=(volatile char *)0x31;
  *outf=out_data;
}
void lcd_control(void){
  outpul(0x01);
  Delay(1);
  outpul(0x00);
  Delay(1);
}
void outpul(char out_pul){
  volatile char *outk=(volatile char *)0x108;
  *outk = out_pul;
}
void Delay(int time){   //delay function
  volatile long i;
  for(i=0;i<time;i++);
}
void write_string(char *ptr){   //write string function
  while(*ptr != 0)
  {
    write_data(*ptr);
    ptr++;
  }
}
void write_data(char wr_data){
  outconf(wr_data);
  outpul(0x02);
  Delay(1);
  outpul(0x03);
  Delay(1);
  outpul(0x02);
  Delay(1);
}

