LCD 4 BIT OPERATION.rar_lcd display 4bit_operation

/* * lcd_4bit_functions.c * * Created: 13-Jan-14 3:16:08 PM * Author: Khalid.Ateia */ #include "LCD.h" /*----------------------------------------------------------------*/ void lcd_4bit_init( INT8U *data_port , INT8U *control_pins_port ) { *( data_port - 1 ) = 0xff; *( control_pins_port - 1 ) = 0xff; LCD_DATA_PORT = 0xFF; _delay_ms(20); LCD_DATA_PORT = 0x30 ; ENABLE_LCD ; DISABLE_LCD ; _delay_ms(10); LCD_DATA_PORT = 0X30 ; ENABLE_LCD ; DISABLE_LCD ; _delay_ms(1); LCD_DATA_PORT = 0x30 ; ENABLE_LCD ; DISABLE_LCD ; _delay_ms(1); LCD_DATA_PORT = 0x20 ; ENABLE_LCD ; DISABLE_LCD ; _delay_ms(1); lcd_4bit_cmd(0x28); lcd_4bit_cmd(0x0c); lcd_4bit_cmd(01); lcd_4bit_cmd(06); lcd_4bit_cmd(80); } void lcd_4bit_cmd(INT8U data) { LCD_DATA_PORT = ( data & 0xf0 ) ; SET_LCD_CMD ; ENABLE_LCD ; DISABLE_LCD ; LCD_DATA_PORT = ( (data << 4 ) & 0xf0 ) ; SET_LCD_CMD ; ENABLE_LCD ; DISABLE_LCD ; _delay_ms(2); _delay_ms(2); } void lcd_4bit_out_char(INT8U data) { LCD_DATA_PORT = ( data & 0xf0 ) ; SET_LCD_DATA ; ENABLE_LCD ; DISABLE_LCD ; LCD_DATA_PORT = ( ( data <<4 ) & 0xf0 ) ; SET_LCD_DATA ; ENABLE_LCD ; DISABLE_LCD ; _delay_ms(2) ; _delay_ms(2) ; } void lcd_4bit_out_string(INT8U *string) { while( *string != '\0' ) { lcd_4bit_out_char( *string++ ) ; } } void cursor_position(INT8U row,INT8U column) { switch(row) { case 1: lcd_4bit_cmd( 0x80 + column-1 ) ; break ; case 2: lcd_4bit_cmd( 0xc0 + column-1 ) ; break ; case 3: //lcd_write_cmd( ); break ; case 4: //lcd_write_cmd( ); break ; default: break ; } } /*----------------------------------------------------------------*/