/*
* LCD16X2.h
*
* Created: 18-Nov-21 16:04:17
* Author: udani
*/
#ifndef LCD16X2_H_
#define LCD16X2_H_
#define LCD_Dir DDRB /* Define LCD data port direction */
#define LCD_Port PORTB /* Define LCD data port */
#define RS PB0 /* Define Register Select pin */
#define EN PB1 /* Define Enable signal pin */
void LCD_Command( unsigned char cmnd )
{
LCD_Port = (LCD_Port & 0x0F) | (cmnd & 0xF0); /* sending upper nibble */
LCD_Port &= ~ (1<<RS); /* RS=0, command reg. */
LCD_Port |= (1<<EN); /* Enable pulse */
_delay_us(1);
LCD_Port &= ~ (1<<EN);
_delay_us(200);
LCD_Port = (LCD_Port & 0x0F) | (cmnd << 4); /* sending lower nibble */
LCD_Port |= (1<<EN);
_delay_us(1);
LCD_Port &= ~ (1<<EN);
_delay_ms(2);
}
void LCD_Char( unsigned char data )
{
LCD_Port = (LCD_Port & 0x0F) | (data & 0xF0); /* sending upper nibble */
LCD_Port |= (1<<RS); /* RS=1, data reg. */
LCD_Port|= (1<<EN);
_delay_us(1);
LCD_Port &= ~ (1<<EN);
_delay_us(200);
LCD_Port = (LCD_Port & 0x0F) | (data << 4); /* sending lower nibble */
LCD_Port |= (1<<EN);
_delay_us(1);
LCD_Port &= ~ (1<<EN);
_delay_ms(2);
}
void LCD_Init (void) /* LCD Initialize function */
{
LCD_Dir = 0xFF; /* Make LCD port direction as o/p */
_delay_ms(20); /* LCD Power ON delay always >15ms */
LCD_Command(0x02); /* send for 4 bit initialization of LCD */
LCD_Command(0x28); /* 2 line, 5*7 matrix in 4-bit mode */
LCD_Command(0x0c); /* Display on cursor off*/
LCD_Command(0x06); /* Increment cursor (shift cursor to right)*/
LCD_Command(0x01); /* Clear display screen*/
_delay_ms(2);
}
void LCD_String (char *str) /* Send string to LCD function */
{
unsigned char i=0;
while (str[i] |= 0)
{
LCD_Char(str[i]);
i++;
}
}
void LCD_String_xy (char row, char pos) /* Send string to LCD with xy position */
{
if (row == 0 && pos<16)
LCD_Command((pos & 0x0F)|0x80); /* Command of first row and required position<16 */
else if (row == 1 && pos<16)
LCD_Command((pos & 0x0F)|0xC0); /* Command of first row and required position<16 */
}
void LCD_String_xy2 (char row, char pos, char *str) /* Send string to LCD with xy position */
{
if (row == 0 && pos<16)
LCD_Command((pos & 0x0F)|0x80); /* Command of first row and required position<16 */
else if (row == 1 && pos<16)
LCD_Command((pos & 0x0F)|0xC0); /* Command of first row and required position<16 */
LCD_String(str); /* Call LCD string function */
}
void LCD_Clear()
{
LCD_Command (0x01); /* Clear display */
_delay_ms(2);
LCD_Command (0x80); /* Cursor at home position */
}
#endif /* LCD16X2_H_ */