p18f_lcd.h

PIC18實作範例

//
// Defines for I/O ports that provide LCD data & control
// PORTD[0:3]-->DB[4:7]: Higher order 4 lines data bus with bidirectional
//					  : DB7 can be used as a BUSY flag
// PORTA,2 --> [E] : LCD operation start signal control 
// PORTD,5 --> [RW]: LCD Read/Write control
// PORTD,4 --> [RS]: LCD Register Select control
//		      	   : "0" for Instrunction register (Write), Busy Flag (Read)
//				   : "1" for data register (Read/Write)
//
#define CPU_SPEED		16			// CPU speed is 16 Mhz !!
#define LCD_RS			PORTDbits.RD4		// The definition of control pins
#define LCD_RW			PORTDbits.RD5
#define LCD_E			PORTAbits.RA2
#define LCD_DATA		LATD			// PORTD[0:3] as LCD DB[4:7]
#define DIR_LCD_DATA		TRISD	


//  LCD Module commands
#define DISP_2Line_8Bit	0b00111000
#define DISP_2Line_4Bit	0b00101000
#define DISP_ON			0x00C		// Display on
#define DISP_ON_C		0x00E		// Display on, Cursor on
#define DISP_ON_B		0x00F		// Display on, Cursor on, Blink cursor
#define DISP_OFF		0x008		// Display off
#define CLR_DISP		0x001		// Clear the Display
#define ENTRY_INC		0x006		//
#define ENTRY_INC_S		0x007		//
#define ENTRY_DEC		0x004		//
#define ENTRY_DEC_S		0x005		//
#define DD_RAM_ADDR		0x080		// Least Significant 7-bit are for address
#define DD_RAM_UL		0x080		// Upper Left coner of the Display	

// Declaration file for LCD related subroutines 

void	OpenLCD (void) ;
void	WriteCmdLCD ( unsigned char ) ;
void	WriteDataLCD( unsigned char ) ;
void 	putsLCD( char * ) ;
void	putrsLCD( const rom far char * ) ;
void	putcLCD( unsigned char ) ;
void	puthexLCD( unsigned char ) ;
void	LCD_Set_Cursor( unsigned char , unsigned char ) ;
void	LCD_CMD_W_Timing( void ) ;
void	LCD_L_Delay( void ) ;
void	LCD_S_Delay( void ) ;
void	LCD_DAT_W_Timing ( void ) ;
void	LCD_Clear(unsigned char CurY);