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TextLCD.cpp@0:48870d877970, 2011-09-19 (annotated)

Committer:: Markus_Paar
Date:: Mon Sep 19 10:25:22 2011 +0000
Revision:: 0:48870d877970

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User	Revision	Line number	New contents of line
Markus_Paar	0:48870d877970	1	/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
Markus_Paar	0:48870d877970	2	* Copyright (c) 2007-2010, sford, http://mbed.org
Markus_Paar	0:48870d877970	3	*
Markus_Paar	0:48870d877970	4	* Permission is hereby granted, free of charge, to any person obtaining a copy
Markus_Paar	0:48870d877970	5	* of this software and associated documentation files (the "Software"), to deal
Markus_Paar	0:48870d877970	6	* in the Software without restriction, including without limitation the rights
Markus_Paar	0:48870d877970	7	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Markus_Paar	0:48870d877970	8	* copies of the Software, and to permit persons to whom the Software is
Markus_Paar	0:48870d877970	9	* furnished to do so, subject to the following conditions:
Markus_Paar	0:48870d877970	10	*
Markus_Paar	0:48870d877970	11	* The above copyright notice and this permission notice shall be included in
Markus_Paar	0:48870d877970	12	* all copies or substantial portions of the Software.
Markus_Paar	0:48870d877970	13	*
Markus_Paar	0:48870d877970	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Markus_Paar	0:48870d877970	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Markus_Paar	0:48870d877970	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Markus_Paar	0:48870d877970	17	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Markus_Paar	0:48870d877970	18	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Markus_Paar	0:48870d877970	19	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
Markus_Paar	0:48870d877970	20	* THE SOFTWARE.
Markus_Paar	0:48870d877970	21	*/
Markus_Paar	0:48870d877970	22
Markus_Paar	0:48870d877970	23	#include "TextLCD.h"
Markus_Paar	0:48870d877970	24	#include "mbed.h"
Markus_Paar	0:48870d877970	25
Markus_Paar	0:48870d877970	26	TextLCD::TextLCD(PinName rs, PinName e, PinName d4, PinName d5,
Markus_Paar	0:48870d877970	27	PinName d6, PinName d7, LCDType type) : _rs(rs),
Markus_Paar	0:48870d877970	28	_e(e), _d(d4, d5, d6, d7),
Markus_Paar	0:48870d877970	29	_type(type) {
Markus_Paar	0:48870d877970	30
Markus_Paar	0:48870d877970	31	_e = 1;
Markus_Paar	0:48870d877970	32	_rs = 0; // command mode
Markus_Paar	0:48870d877970	33
Markus_Paar	0:48870d877970	34	wait(0.015); // Wait 15ms to ensure powered up
Markus_Paar	0:48870d877970	35
Markus_Paar	0:48870d877970	36	// send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
Markus_Paar	0:48870d877970	37	for (int i=0; i<3; i++) {
Markus_Paar	0:48870d877970	38	writeByte(0x3);
Markus_Paar	0:48870d877970	39	wait(0.00164); // this command takes 1.64ms, so wait for it
Markus_Paar	0:48870d877970	40	}
Markus_Paar	0:48870d877970	41	writeByte(0x2); // 4-bit mode
Markus_Paar	0:48870d877970	42	wait(0.000040f); // most instructions take 40us
Markus_Paar	0:48870d877970	43
Markus_Paar	0:48870d877970	44	writeCommand(0x28); // Function set 001 BW N F - -
Markus_Paar	0:48870d877970	45	writeCommand(0x0C);
Markus_Paar	0:48870d877970	46	writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
Markus_Paar	0:48870d877970	47	cls();
Markus_Paar	0:48870d877970	48	}
Markus_Paar	0:48870d877970	49
Markus_Paar	0:48870d877970	50	void TextLCD::character(int column, int row, int c) {
Markus_Paar	0:48870d877970	51	int a = address(column, row);
Markus_Paar	0:48870d877970	52	writeCommand(a);
Markus_Paar	0:48870d877970	53	writeData(c);
Markus_Paar	0:48870d877970	54	}
Markus_Paar	0:48870d877970	55
Markus_Paar	0:48870d877970	56	void TextLCD::cls() {
Markus_Paar	0:48870d877970	57	writeCommand(0x01); // cls, and set cursor to 0
Markus_Paar	0:48870d877970	58	wait(0.00164f); // This command takes 1.64 ms
Markus_Paar	0:48870d877970	59	locate(0, 0);
Markus_Paar	0:48870d877970	60	}
Markus_Paar	0:48870d877970	61
Markus_Paar	0:48870d877970	62	void TextLCD::locate(int column, int row) {
Markus_Paar	0:48870d877970	63	_column = column;
Markus_Paar	0:48870d877970	64	_row = row;
Markus_Paar	0:48870d877970	65	}
Markus_Paar	0:48870d877970	66
Markus_Paar	0:48870d877970	67	int TextLCD::_putc(int value) {
Markus_Paar	0:48870d877970	68	if (value == '\n') {
Markus_Paar	0:48870d877970	69	_column = 0;
Markus_Paar	0:48870d877970	70	_row++;
Markus_Paar	0:48870d877970	71	if (_row >= rows()) {
Markus_Paar	0:48870d877970	72	_row = 0;
Markus_Paar	0:48870d877970	73	}
Markus_Paar	0:48870d877970	74	} else {
Markus_Paar	0:48870d877970	75	character(_column, _row, value);
Markus_Paar	0:48870d877970	76	_column++;
Markus_Paar	0:48870d877970	77	if (_column >= columns()) {
Markus_Paar	0:48870d877970	78	_column = 0;
Markus_Paar	0:48870d877970	79	_row++;
Markus_Paar	0:48870d877970	80	if (_row >= rows()) {
Markus_Paar	0:48870d877970	81	_row = 0;
Markus_Paar	0:48870d877970	82	}
Markus_Paar	0:48870d877970	83	}
Markus_Paar	0:48870d877970	84	}
Markus_Paar	0:48870d877970	85	return value;
Markus_Paar	0:48870d877970	86	}
Markus_Paar	0:48870d877970	87
Markus_Paar	0:48870d877970	88	int TextLCD::_getc() {
Markus_Paar	0:48870d877970	89	return -1;
Markus_Paar	0:48870d877970	90	}
Markus_Paar	0:48870d877970	91
Markus_Paar	0:48870d877970	92	void TextLCD::writeByte(int value) {
Markus_Paar	0:48870d877970	93	_d = value >> 4;
Markus_Paar	0:48870d877970	94	wait(0.000040f); // most instructions take 40us
Markus_Paar	0:48870d877970	95	_e = 0;
Markus_Paar	0:48870d877970	96	wait(0.000040f);
Markus_Paar	0:48870d877970	97	_e = 1;
Markus_Paar	0:48870d877970	98	_d = value >> 0;
Markus_Paar	0:48870d877970	99	wait(0.000040f);
Markus_Paar	0:48870d877970	100	_e = 0;
Markus_Paar	0:48870d877970	101	wait(0.000040f); // most instructions take 40us
Markus_Paar	0:48870d877970	102	_e = 1;
Markus_Paar	0:48870d877970	103	}
Markus_Paar	0:48870d877970	104
Markus_Paar	0:48870d877970	105	void TextLCD::writeCommand(int command) {
Markus_Paar	0:48870d877970	106	_rs = 0;
Markus_Paar	0:48870d877970	107	writeByte(command);
Markus_Paar	0:48870d877970	108	}
Markus_Paar	0:48870d877970	109
Markus_Paar	0:48870d877970	110	void TextLCD::writeData(int data) {
Markus_Paar	0:48870d877970	111	_rs = 1;
Markus_Paar	0:48870d877970	112	writeByte(data);
Markus_Paar	0:48870d877970	113	}
Markus_Paar	0:48870d877970	114
Markus_Paar	0:48870d877970	115	int TextLCD::address(int column, int row) {
Markus_Paar	0:48870d877970	116	switch (_type) {
Markus_Paar	0:48870d877970	117	case LCD20x4:
Markus_Paar	0:48870d877970	118	switch (row) {
Markus_Paar	0:48870d877970	119	case 0:
Markus_Paar	0:48870d877970	120	return 0x80 + column;
Markus_Paar	0:48870d877970	121	case 1:
Markus_Paar	0:48870d877970	122	return 0xc0 + column;
Markus_Paar	0:48870d877970	123	case 2:
Markus_Paar	0:48870d877970	124	return 0x94 + column;
Markus_Paar	0:48870d877970	125	case 3:
Markus_Paar	0:48870d877970	126	return 0xd4 + column;
Markus_Paar	0:48870d877970	127	}
Markus_Paar	0:48870d877970	128	case LCD16x2B:
Markus_Paar	0:48870d877970	129	return 0x80 + (row * 40) + column;
Markus_Paar	0:48870d877970	130	case LCD16x2:
Markus_Paar	0:48870d877970	131	case LCD20x2:
Markus_Paar	0:48870d877970	132	default:
Markus_Paar	0:48870d877970	133	return 0x80 + (row * 0x40) + column;
Markus_Paar	0:48870d877970	134	}
Markus_Paar	0:48870d877970	135	}
Markus_Paar	0:48870d877970	136
Markus_Paar	0:48870d877970	137	int TextLCD::columns() {
Markus_Paar	0:48870d877970	138	switch (_type) {
Markus_Paar	0:48870d877970	139	case LCD20x4:
Markus_Paar	0:48870d877970	140	case LCD20x2:
Markus_Paar	0:48870d877970	141	return 20;
Markus_Paar	0:48870d877970	142	case LCD16x2:
Markus_Paar	0:48870d877970	143	case LCD16x2B:
Markus_Paar	0:48870d877970	144	default:
Markus_Paar	0:48870d877970	145	return 16;
Markus_Paar	0:48870d877970	146	}
Markus_Paar	0:48870d877970	147	}
Markus_Paar	0:48870d877970	148
Markus_Paar	0:48870d877970	149	int TextLCD::rows() {
Markus_Paar	0:48870d877970	150	switch (_type) {
Markus_Paar	0:48870d877970	151	case LCD20x4:
Markus_Paar	0:48870d877970	152	return 4;
Markus_Paar	0:48870d877970	153	case LCD16x2:
Markus_Paar	0:48870d877970	154	case LCD16x2B:
Markus_Paar	0:48870d877970	155	case LCD20x2:
Markus_Paar	0:48870d877970	156	default:
Markus_Paar	0:48870d877970	157	return 2;
Markus_Paar	0:48870d877970	158	}
Markus_Paar	0:48870d877970	159	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	19 Sep 2011
Imports:	9
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

TextLCD.cpp@0:48870d877970, 2011-09-19 (annotated)

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