#ifndef LCD_H_
#define LCD_H_


#include <avr/io.h>
#include <util/delay.h>
#include "RTC.h"
/* Wiring dependent definitions */
#define LCDcontrolPort PORTA // Output Port Register
#define DDRcontrolPort DDRA  // Data Direction Register
#define E  7 // Enable Signal
#define RW 6 // Read Write Select Signal
#define RS 5 // Register Select Signal
#define LCDdataPort PORTB 	// Output Port Register
#define DDRdataPort DDRB  	// Data Direction Register

/* Values defined for the LCD BC2004A-series */
#define FUNCTIONSET 0x38  	// Functionset 00111000 => (8-bit 2-line)
#define DISPLAY_ONOFF 0x0F	// Display ONOFF 00001111 => cursor blinking
#define CLEAR_DISPLAY 0x01 	// Clear LCD display
#define ExecutionTimeCmd 80	// Delay needed for writing command to LCD 
#define ExecutionTimeWrite 50	// Delay needed for writing character to display

#define SECONDS_REGISTER 0x00
#define MINUTES_REGISTER 0x01
#define HOURS_REGISTER 0x02
#define DAYOFWK_REGISTER 0x03
#define DAYS_REGISTER 0x04
#define MONTHS_REGISTER 0x05
#define YEARS_REGISTER 0x06

char sendNumber(uint8_t nbr);

void write_lcd_cmd(unsigned char command); // sends instruction to LCD
void write_on_lcd(unsigned char character); // prints character on LCD screen
void sendString(char *string_of_characters); // prints string on LCD screen

void lcd_init() {
	DDRcontrolPort |= 1<<E | 1<<RW | 1<<RS; // E RW RS set as output 
	DDRdataPort = 0xFF; // data port set as output 
	LCDcontrolPort |= 1<<E; // E=1
	LCDcontrolPort &= ~(1<<RW|1<<RS); // RW=0 RS=0 
	write_lcd_cmd(FUNCTIONSET); // Functionset, 00111000 (8-bit 2-line)
	write_lcd_cmd(DISPLAY_ONOFF); // Display ON/OFF 00001111 blinking cursor
}

void write_lcd_cmd(unsigned char command){
	LCDcontrolPort |= 1<<E;	// Enable 1
	LCDcontrolPort &= ~(1<<RW|1<<RS); // RW=0 RS=0
	LCDdataPort = command;	// command to port 
	LCDcontrolPort &= ~(1<<E); // Enable 0
	LCDcontrolPort |= 1<<E;	// Enable 1
	_delay_ms(ExecutionTimeCmd); // Dependent on execution times
}

void write_on_lcd(unsigned char character){
	LCDcontrolPort |= 1<<E | 1<<RS; // E=1 RS=1
	LCDcontrolPort &= ~(1<<RW); // RW=0
	LCDdataPort = character; // character to port
	LCDcontrolPort &= ~(1<<E); // Enable 0
	LCDcontrolPort |= 1<<E; // Enable 1
	_delay_ms(ExecutionTimeWrite); // Dependent on execution times
}

void sendString(char *string_of_characters){
	while(*string_of_characters>0){
		write_on_lcd(*string_of_characters++);
		//_delay_ms(100); // Just to make it look nice
	}
}

void WriteTime()
{
 uint8_t hours, minutes, seconds;
 DS1307_GetTime(&hours,&minutes,&seconds);
 TwoDigits(hours);
 write_on_lcd(':');
 TwoDigits(minutes);
 write_on_lcd(':');
 TwoDigits(seconds);
}

void DS1307_GetDate(uint8_t *months, uint8_t *days, uint8_t *years)
// returns months, days, and years in BCD format
{
 *months = rtc_read_register(MONTHS_REGISTER);
 *days = rtc_read_register(DAYS_REGISTER);
 *years = rtc_read_register(YEARS_REGISTER);
}

void WriteDate()
{
 uint8_t months, days, years;
 DS1307_GetDate(&months,&days,&years);
 TwoDigits(months);
 write_on_lcd('/');
 TwoDigits(days);
 write_on_lcd('/');
 TwoDigits(years);
}

void DS1307_GetTime(uint8_t *hours, uint8_t *minutes, uint8_t *seconds)
// returns hours, minutes, and seconds in BCD format
{
 *hours = rtc_read_register(HOURS_REGISTER);
 *minutes = rtc_read_register(MINUTES_REGISTER);
 *seconds = rtc_read_register(SECONDS_REGISTER);
 if (*hours & 0x40) // 12hr mode:
 *hours &= 0x1F; // use bottom 5 bits (pm bit = temp & 0x20)
 else *hours &= 0x3F; // 24hr mode: use bottom 6 bits
}

void TwoDigits(uint8_t data)
// helper function for WriteDate() and WriteTime()
// input is two digits in BCD format
// output is to LCD display at current cursor position
{
 uint8_t temp = data>>4; // get upper 4 bits
 write_on_lcd(sendNumber(temp)); // display upper digit
 data &= 0x0F; // get lower 4 bits
 write_on_lcd(sendNumber(data)); // display lower digit
}

//convert int to string
char sendNumber(uint8_t nbr){
	switch(nbr){
		case 0:
		return('0');
		break;
		case 1:
		return('1');
		break;
		case 2:
		return('2');
		break;
		case 3:
		return('3');
		break;
		case 4:
		return('4');
		break;
		case 5:
		return('5');
		break;
		case 6:
		return('6');
		break;
		case 7:
		return('7');
		break;
		case 8:
		return('8');
		break;
		case 9:
		return('9');
		break;
	}
}

#endif //LCD_H