lcd.h

嵌入式ARM的一些源代码

// most of this is taken from the file
// hal/powerpc/cogent/current/src/hal_diag.c in the
// Cygnus eCos source. Here is the copyright notice:
//
//=============================================================================
//
//      hal_diag.c
//
//      HAL diagnostic output code
//
//=============================================================================
//####COPYRIGHTBEGIN####
//
// -------------------------------------------
// The contents of this file are subject to the Cygnus eCos Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License.  You may obtain a copy of the License at
// http://sourceware.cygnus.com/ecos
// 
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
// License for the specific language governing rights and limitations under
// the License.
// 
// The Original Code is eCos - Embedded Cygnus Operating System, released
// September 30, 1998.
// 
// The Initial Developer of the Original Code is Cygnus.  Portions created
// by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved.
// -------------------------------------------
//
//####COPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    nickg, jskov
// Contributors: nickg, jskov
// Date:         1999-03-23
// Purpose:      HAL diagnostic output
// Description:  Implementations of HAL diagnostic output support.
//
//####DESCRIPTIONEND####
//
//=============================================================================

// FEMA 162B 16 character x 2 line LCD

// status register bit definitions
#define LCD_STAT_BUSY	0x80	// 1 = display busy
#define LCD_STAT_ADD	0x7F	// bits 0-6 return current display address

// command register definitions
#define LCD_CMD_RST	0x01	// clear entire display and reset display addr
#define LCD_CMD_HOME	0x02	// reset display address and reset any shifting
#define LCD_CMD_ECL	0x04	// move cursor left one pos on next data write
#define LCD_CMD_ESL	0x05	// shift display left one pos on next data write
#define LCD_CMD_ECR	0x06	// move cursor right one pos on next data write
#define LCD_CMD_ESR	0x07	// shift disp right one pos on next data write
#define LCD_CMD_DOFF	0x08	// display off, cursor off, blinking off
#define LCD_CMD_BL	0x09	// blink character at current cursor position
#define LCD_CMD_CUR	0x0A	// enable cursor on
#define LCD_CMD_DON	0x0C	// turn display on
#define LCD_CMD_CL	0x10	// move cursor left one position
#define LCD_CMD_SL	0x14	// shift display left one position
#define LCD_CMD_CR	0x18	// move cursor right one position
#define LCD_CMD_SR	0x1C	// shift display right one position
#define LCD_CMD_MODE	0x38	// sets 8 bits, 2 lines, 5x7 characters
#define LCD_CMD_ACG	0x40	// bits 0-5 sets character generator address
#define LCD_CMD_ADD	0x80	// bits 0-6 sets display data addr to line 1 +

// LCD status values
#define LCD_OK		0x00
#define LCD_ERR 	0x01

#define LCD_LINE0	0x00
#define LCD_LINE1	0x40

#define LCD_LINE_LENGTH	16

extern void lcd_init(void);
extern void lcd_write_char(const char);
extern void lcd_flush(void);
extern void lcd_write_string(const char *);
extern void lcd_printf(const char *, ...);