// Connections
sbit LED at LATA4_bit;

// LCD module connections
sbit LCD_RS         at LATD0_bit;
sbit LCD_EN         at LATD1_bit;
sbit LCD_D4         at LATD2_bit;
sbit LCD_D5         at LATD3_bit;
sbit LCD_D6         at LATD4_bit;
sbit LCD_D7         at LATD5_bit;

sbit LCD_RS_Direction at TRISD0_bit;
sbit LCD_EN_Direction at TRISD1_bit;
sbit LCD_D7_Direction at TRISD2_bit;
sbit LCD_D6_Direction at TRISD3_bit;
sbit LCD_D5_Direction at TRISD4_bit;
sbit LCD_D4_Direction at TRISD5_bit;   

// DS1307 I2C Connections
sbit Soft_I2C_Scl           at RB6_bit;
sbit Soft_I2C_Sda           at RB7_bit;
sbit Soft_I2C_Scl_Direction at TRISB6_bit;
sbit Soft_I2C_Sda_Direction at TRISB7_bit;

// Global Variables
unsigned short second;
unsigned short minute;
unsigned short hour;
unsigned short dayOfWeek;
unsigned short day;
unsigned short month;
unsigned short year;

unsigned short lastSecond=0;

void SetDateTime(unsigned short second, unsigned short minute, unsigned short hour, unsigned short dayOfWeek, unsigned short day, unsigned short month, unsigned short year){
  Soft_I2C_Start();
  Soft_I2C_Write(0xD0);
  Soft_I2C_Write(0x00);
  Soft_I2C_Write(second);
  Soft_I2C_Write(minute);
  Soft_I2C_Write(hour);
  Soft_I2C_Write(dayOfWeek);
  Soft_I2C_Write(day);
  Soft_I2C_Write(month);
  Soft_I2C_Write(year);
  Soft_I2C_Stop();
}

void GetDateTime(unsigned short *second, unsigned short *minute, unsigned short *hour, unsigned short *dayOfWeek, unsigned short *day, unsigned short *month, unsigned short *year){
  Soft_I2C_Start();
  Soft_I2C_Write(0xD0);
  Soft_I2C_Write(0);
  Soft_I2C_Start();
  Soft_I2C_Write(0xD1);

  *second    = Soft_I2C_Read(1);
  *minute    = Soft_I2C_Read(1);
  *hour      = Soft_I2C_Read(1);
  *dayOfWeek = Soft_I2C_Read(1);
  *day       = Soft_I2C_Read(1);
  *month     = Soft_I2C_Read(1);
  *year      = Soft_I2C_Read(0);
  Soft_I2C_Stop();


  *second  = ((*second & 0xF0)>>4)*10 + (*second & 0x0F);
  *minute  = ((*minute & 0xF0)>>4)*10 + (*minute & 0x0F);
  *hour    = ((*hour   & 0xF0)>>4)*10 + (*hour   & 0x0F);
  *day     = ((*day    & 0x30)>>4)*10 + (*day    & 0x0F);
  *month   = ((*month  & 0x10)>>4)*10 + (*month  & 0x0F);
  *year    = ((*year   & 0xF0)>>4)*10 + (*year   & 0x0F);
}

void Display_Time() {
  unsigned short i;
  char date[16];
  char time[16];

  date[ 0]='T';
  date[ 1]='a';
  date[ 2]='r';
  date[ 3]='i';
  date[ 4]='h';
  date[ 5]=':';
  date[ 6]=day/10+48;
  date[ 7]=day%10+48;
  date[ 8]='/';
  date[ 9]=month/10+48;
  date[10]=month%10+48;
  date[11]='/';
  date[12]='2';
  date[13]='0';
  date[14]=year/10+48;
  date[15]=year%10+48;

  time[ 0]='S';
  time[ 1]='a';
  time[ 2]='a';
  time[ 3]='t';
  time[ 4]=' ';
  time[ 5]=':';
  time[ 6]=' ';
  time[ 7]=' ';
  time[ 8]=hour/10+48;
  time[ 9]=hour%10+48;
  time[10]='.';
  time[11]=minute/10+48;
  time[12]=minute%10+48;
  time[13]='.';
  time[14]=second/10+48;
  time[15]=second%10+48;

  if(lastSecond != second){
    Lcd_Out(1,1,date);
    Lcd_Out(2,1,time);
    lastSecond=second;
  }
}

void main() {
  TRISA=0b00000000;// [][][][LED][][][][]
  TRISB=0b00000000;// [][][][][][][][]
  TRISC=0b00000000;// [][][][][][][][]
  TRISD=0b00000000;// [][][LCD_D7][LCD_D6][LCD_D5][LCD_D4][LCD_EN][LCD_RS]
  TRISE=0b00000000;// [][][][][][][][]

  LATA=0x00;
  LATB=0x00;
  LATC=0x00;
  LATD=0x00;
  LATE=0x00;
  
  Lcd_Init();
  Lcd_Cmd(_LCD_CURSOR_OFF);
  Lcd_Cmd(_LCD_CLEAR);
  
  Soft_I2C_Init();
  SetDateTime(0x00,0x42,0x01,0x06,0x28,0x09,0x22);
  
  while(1){
    GetDateTime(&second, &minute, &hour, &dayOfWeek, &day, &month, &year);
    Display_Time();
    delay_ms(100);
    LED=!LED;
  }
}