lcd.c

#include "lcd.h"

void LCD_init(void)
{
    _delay_ms(30);
	LCD_DATA_PORT_DIR = 0xFF; /* Configure the data port as output port */
	LCD_CTRL_PORT_DIR |= (1<<E) | (1<<RS) | (1<<RW); /* Configure the control pins(E,RS,RW) as output pins */

	LCD_sendCommand(SINGLE_LINE_LCD_Four_BIT_MODE); /* use 2-line lcd + 8-bit Data Mode + 5*7 dot display Mode */
	LCD_sendCommand(CURSOR_OFF); /* cursor off */
	LCD_sendCommand(CLEAR_COMMAND); /* clear LCD at the beginning */
	_delay_ms(30);
}

void LCD_sendCommand(uint8 command)
{
    unsigned char a,b;
    a = command & 0xf0;  b = command << 4;

	CLEAR_BIT(LCD_CTRL_PORT,RS); /* Instruction Mode RS=0 */
	CLEAR_BIT(LCD_CTRL_PORT,RW); /* write data to LCD so RW=0 */
	_delay_ms(1); /* delay for processing Tas = 50ns */
	SET_BIT(LCD_CTRL_PORT,E); /* Enable LCD E=1 */
	_delay_ms(1); /* delay for processing Tpw - Tdws = 190ns */
	LCD_DATA_PORT = a; /* out the required command to the data bus D0 --> D7 */
	_delay_ms(1); /* delay for processing Tdsw = 100ns */
	CLEAR_BIT(LCD_CTRL_PORT,E); /* disable LCD E=0 */
	_delay_ms(1); /* delay for processing Th = 13ns */


    SET_BIT(LCD_CTRL_PORT,E); /* Enable LCD E=1 */
	_delay_ms(1); /* delay for processing Tpw - Tdws = 190ns */
	LCD_DATA_PORT = b; /* out the required command to the data bus D0 --> D7 */
	_delay_ms(1); /* delay for processing Tdsw = 100ns */
	CLEAR_BIT(LCD_CTRL_PORT,E); /* disable LCD E=0 */
	_delay_ms(1); /* delay for processing Th = 13ns */
}

void LCD_displayCharacter(uint8 data)
{
    unsigned char a,b;
    a = data & 0xf0;  b = data << 4;

	SET_BIT(LCD_CTRL_PORT,RS); /* Data Mode RS=1 */
	CLEAR_BIT(LCD_CTRL_PORT,RW); /* write data to LCD so RW=0 */
	_delay_ms(1); /* delay for processing Tas = 50ns */
	SET_BIT(LCD_CTRL_PORT,E); /* Enable LCD E=1 */
	_delay_ms(1); /* delay for processing Tpw - Tdws = 190ns */
	LCD_DATA_PORT = a; /* out the required data char to the data bus D0 --> D7 */
	_delay_ms(1); /* delay for processing Tdsw = 100ns */
	CLEAR_BIT(LCD_CTRL_PORT,E); /* disable LCD E=0 */
	_delay_ms(1); /* delay for processing Th = 13ns */

    _delay_ms(1); /* delay for processing Tas = 50ns */
	SET_BIT(LCD_CTRL_PORT,E); /* Enable LCD E=1 */
	_delay_ms(1); /* delay for processing Tpw - Tdws = 190ns */
	LCD_DATA_PORT = b; /* out the required data char to the data bus D0 --> D7 */
	_delay_ms(1); /* delay for processing Tdsw = 100ns */
	CLEAR_BIT(LCD_CTRL_PORT,E); /* disable LCD E=0 */
	_delay_ms(1); /* delay for processing Th = 13ns */
}

void LCD_displayString(const char *Str)
{
	uint8 i = 0;
	while(Str[i] != '\0')
	{
		LCD_displayCharacter(Str[i]);
		i++;
	}
}

void LCD_goToRowColumn(uint8 row,uint8 col)
{
	uint8 Address;
  
	switch(row)
	{
		case 0:
				Address=col;
				break;
		case 1:
				Address=col+0x40;
				break;
		case 2:
				Address=col+0x10;
				break;
		case 3:
				Address=col+0x50;
				break;
	}
	/* to write to a specific address in the LCD
	 * we need to apply the corresponding command 0b10000000+Address */
	LCD_sendCommand(Address | SET_CURSOR_LOCATION);
}

void LCD_displayStringRowColumn(uint8 row,uint8 col,const char *Str)
{
	LCD_goToRowColumn(row,col); /* go to to the required LCD position */
	LCD_displayString(Str); /* display the string */
}

void LCD_intgerToString(int data)
{
   char buff[16]; /* String to hold the ascii result */
   itoa(data,buff,10); /* 10 for decimal */
   LCD_displayString(buff);
}

void LCD_clearScreen(void)
{
	LCD_sendCommand(CLEAR_COMMAND); //clear display
}