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TextLCD/TextLCD.cpp@0:5bf7e3564c3b, 2012-06-17 (annotated)

Committer:: esmiwa
Date:: Sun Jun 17 01:15:35 2012 +0000
Revision:: 0:5bf7e3564c3b

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esmiwa	0:5bf7e3564c3b	1	/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
esmiwa	0:5bf7e3564c3b	2	* Copyright (c) 2007-2010, sford, http://mbed.org
esmiwa	0:5bf7e3564c3b	3	*
esmiwa	0:5bf7e3564c3b	4	* Permission is hereby granted, free of charge, to any person obtaining a copy
esmiwa	0:5bf7e3564c3b	5	* of this software and associated documentation files (the "Software"), to deal
esmiwa	0:5bf7e3564c3b	6	* in the Software without restriction, including without limitation the rights
esmiwa	0:5bf7e3564c3b	7	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
esmiwa	0:5bf7e3564c3b	8	* copies of the Software, and to permit persons to whom the Software is
esmiwa	0:5bf7e3564c3b	9	* furnished to do so, subject to the following conditions:
esmiwa	0:5bf7e3564c3b	10	*
esmiwa	0:5bf7e3564c3b	11	* The above copyright notice and this permission notice shall be included in
esmiwa	0:5bf7e3564c3b	12	* all copies or substantial portions of the Software.
esmiwa	0:5bf7e3564c3b	13	*
esmiwa	0:5bf7e3564c3b	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
esmiwa	0:5bf7e3564c3b	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
esmiwa	0:5bf7e3564c3b	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
esmiwa	0:5bf7e3564c3b	17	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
esmiwa	0:5bf7e3564c3b	18	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
esmiwa	0:5bf7e3564c3b	19	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
esmiwa	0:5bf7e3564c3b	20	* THE SOFTWARE.
esmiwa	0:5bf7e3564c3b	21	*/
esmiwa	0:5bf7e3564c3b	22
esmiwa	0:5bf7e3564c3b	23	#include "TextLCD.h"
esmiwa	0:5bf7e3564c3b	24	#include "mbed.h"
esmiwa	0:5bf7e3564c3b	25
esmiwa	0:5bf7e3564c3b	26	TextLCD::TextLCD(PinName rs, PinName e, PinName d0, PinName d1,
esmiwa	0:5bf7e3564c3b	27	PinName d2, PinName d3, LCDType type) : _rs(rs),
esmiwa	0:5bf7e3564c3b	28	_e(e), _d(d0, d1, d2, d3),
esmiwa	0:5bf7e3564c3b	29	_type(type) {
esmiwa	0:5bf7e3564c3b	30
esmiwa	0:5bf7e3564c3b	31	_e = 1;
esmiwa	0:5bf7e3564c3b	32	_rs = 0; // command mode
esmiwa	0:5bf7e3564c3b	33
esmiwa	0:5bf7e3564c3b	34	wait(0.015); // Wait 15ms to ensure powered up
esmiwa	0:5bf7e3564c3b	35
esmiwa	0:5bf7e3564c3b	36	// send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
esmiwa	0:5bf7e3564c3b	37	for (int i=0; i<3; i++) {
esmiwa	0:5bf7e3564c3b	38	writeByte(0x3);
esmiwa	0:5bf7e3564c3b	39	wait(0.00164); // this command takes 1.64ms, so wait for it
esmiwa	0:5bf7e3564c3b	40	}
esmiwa	0:5bf7e3564c3b	41	writeByte(0x2); // 4-bit mode
esmiwa	0:5bf7e3564c3b	42	wait(0.000040f); // most instructions take 40us
esmiwa	0:5bf7e3564c3b	43
esmiwa	0:5bf7e3564c3b	44	writeCommand(0x28); // Function set 001 BW N F - -
esmiwa	0:5bf7e3564c3b	45	writeCommand(0x0C);
esmiwa	0:5bf7e3564c3b	46	writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
esmiwa	0:5bf7e3564c3b	47	cls();
esmiwa	0:5bf7e3564c3b	48	}
esmiwa	0:5bf7e3564c3b	49
esmiwa	0:5bf7e3564c3b	50	void TextLCD::character(int column, int row, int c) {
esmiwa	0:5bf7e3564c3b	51	int a = address(column, row);
esmiwa	0:5bf7e3564c3b	52	writeCommand(a);
esmiwa	0:5bf7e3564c3b	53	writeData(c);
esmiwa	0:5bf7e3564c3b	54	}
esmiwa	0:5bf7e3564c3b	55
esmiwa	0:5bf7e3564c3b	56	void TextLCD::cls() {
esmiwa	0:5bf7e3564c3b	57	writeCommand(0x01); // cls, and set cursor to 0
esmiwa	0:5bf7e3564c3b	58	wait(0.00164f); // This command takes 1.64 ms
esmiwa	0:5bf7e3564c3b	59	locate(0, 0);
esmiwa	0:5bf7e3564c3b	60	}
esmiwa	0:5bf7e3564c3b	61
esmiwa	0:5bf7e3564c3b	62	void TextLCD::locate(int column, int row) {
esmiwa	0:5bf7e3564c3b	63	_column = column;
esmiwa	0:5bf7e3564c3b	64	_row = row;
esmiwa	0:5bf7e3564c3b	65	}
esmiwa	0:5bf7e3564c3b	66
esmiwa	0:5bf7e3564c3b	67	int TextLCD::_putc(int value) {
esmiwa	0:5bf7e3564c3b	68	if (value == '\n') {
esmiwa	0:5bf7e3564c3b	69	_column = 0;
esmiwa	0:5bf7e3564c3b	70	_row++;
esmiwa	0:5bf7e3564c3b	71	if (_row >= rows()) {
esmiwa	0:5bf7e3564c3b	72	_row = 0;
esmiwa	0:5bf7e3564c3b	73	}
esmiwa	0:5bf7e3564c3b	74	} else {
esmiwa	0:5bf7e3564c3b	75	character(_column, _row, value);
esmiwa	0:5bf7e3564c3b	76	_column++;
esmiwa	0:5bf7e3564c3b	77	if (_column >= columns()) {
esmiwa	0:5bf7e3564c3b	78	_column = 0;
esmiwa	0:5bf7e3564c3b	79	_row++;
esmiwa	0:5bf7e3564c3b	80	if (_row >= rows()) {
esmiwa	0:5bf7e3564c3b	81	_row = 0;
esmiwa	0:5bf7e3564c3b	82	}
esmiwa	0:5bf7e3564c3b	83	}
esmiwa	0:5bf7e3564c3b	84	}
esmiwa	0:5bf7e3564c3b	85	return value;
esmiwa	0:5bf7e3564c3b	86	}
esmiwa	0:5bf7e3564c3b	87
esmiwa	0:5bf7e3564c3b	88	int TextLCD::_getc() {
esmiwa	0:5bf7e3564c3b	89	return -1;
esmiwa	0:5bf7e3564c3b	90	}
esmiwa	0:5bf7e3564c3b	91
esmiwa	0:5bf7e3564c3b	92	void TextLCD::writeByte(int value) {
esmiwa	0:5bf7e3564c3b	93	_d = value >> 4;
esmiwa	0:5bf7e3564c3b	94	wait(0.000040f); // most instructions take 40us
esmiwa	0:5bf7e3564c3b	95	_e = 0;
esmiwa	0:5bf7e3564c3b	96	wait(0.000040f);
esmiwa	0:5bf7e3564c3b	97	_e = 1;
esmiwa	0:5bf7e3564c3b	98	_d = value >> 0;
esmiwa	0:5bf7e3564c3b	99	wait(0.000040f);
esmiwa	0:5bf7e3564c3b	100	_e = 0;
esmiwa	0:5bf7e3564c3b	101	wait(0.000040f); // most instructions take 40us
esmiwa	0:5bf7e3564c3b	102	_e = 1;
esmiwa	0:5bf7e3564c3b	103	}
esmiwa	0:5bf7e3564c3b	104
esmiwa	0:5bf7e3564c3b	105	void TextLCD::writeCommand(int command) {
esmiwa	0:5bf7e3564c3b	106	_rs = 0;
esmiwa	0:5bf7e3564c3b	107	writeByte(command);
esmiwa	0:5bf7e3564c3b	108	}
esmiwa	0:5bf7e3564c3b	109
esmiwa	0:5bf7e3564c3b	110	void TextLCD::writeData(int data) {
esmiwa	0:5bf7e3564c3b	111	_rs = 1;
esmiwa	0:5bf7e3564c3b	112	writeByte(data);
esmiwa	0:5bf7e3564c3b	113	}
esmiwa	0:5bf7e3564c3b	114
esmiwa	0:5bf7e3564c3b	115	int TextLCD::address(int column, int row) {
esmiwa	0:5bf7e3564c3b	116	switch (_type) {
esmiwa	0:5bf7e3564c3b	117	case LCD20x4:
esmiwa	0:5bf7e3564c3b	118	switch (row) {
esmiwa	0:5bf7e3564c3b	119	case 0:
esmiwa	0:5bf7e3564c3b	120	return 0x80 + column;
esmiwa	0:5bf7e3564c3b	121	case 1:
esmiwa	0:5bf7e3564c3b	122	return 0xc0 + column;
esmiwa	0:5bf7e3564c3b	123	case 2:
esmiwa	0:5bf7e3564c3b	124	return 0x94 + column;
esmiwa	0:5bf7e3564c3b	125	case 3:
esmiwa	0:5bf7e3564c3b	126	return 0xd4 + column;
esmiwa	0:5bf7e3564c3b	127	}
esmiwa	0:5bf7e3564c3b	128	case LCD16x2B:
esmiwa	0:5bf7e3564c3b	129	return 0x80 + (row * 40) + column;
esmiwa	0:5bf7e3564c3b	130	case LCD16x2:
esmiwa	0:5bf7e3564c3b	131	case LCD20x2:
esmiwa	0:5bf7e3564c3b	132	default:
esmiwa	0:5bf7e3564c3b	133	return 0x80 + (row * 0x40) + column;
esmiwa	0:5bf7e3564c3b	134	}
esmiwa	0:5bf7e3564c3b	135	}
esmiwa	0:5bf7e3564c3b	136
esmiwa	0:5bf7e3564c3b	137	int TextLCD::columns() {
esmiwa	0:5bf7e3564c3b	138	switch (_type) {
esmiwa	0:5bf7e3564c3b	139	case LCD20x4:
esmiwa	0:5bf7e3564c3b	140	case LCD20x2:
esmiwa	0:5bf7e3564c3b	141	return 20;
esmiwa	0:5bf7e3564c3b	142	case LCD16x2:
esmiwa	0:5bf7e3564c3b	143	case LCD16x2B:
esmiwa	0:5bf7e3564c3b	144	default:
esmiwa	0:5bf7e3564c3b	145	return 16;
esmiwa	0:5bf7e3564c3b	146	}
esmiwa	0:5bf7e3564c3b	147	}
esmiwa	0:5bf7e3564c3b	148
esmiwa	0:5bf7e3564c3b	149	int TextLCD::rows() {
esmiwa	0:5bf7e3564c3b	150	switch (_type) {
esmiwa	0:5bf7e3564c3b	151	case LCD20x4:
esmiwa	0:5bf7e3564c3b	152	return 4;
esmiwa	0:5bf7e3564c3b	153	case LCD16x2:
esmiwa	0:5bf7e3564c3b	154	case LCD16x2B:
esmiwa	0:5bf7e3564c3b	155	case LCD20x2:
esmiwa	0:5bf7e3564c3b	156	default:
esmiwa	0:5bf7e3564c3b	157	return 2;
esmiwa	0:5bf7e3564c3b	158	}
esmiwa	0:5bf7e3564c3b	159	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	17 Jun 2012
Imports:	1
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

TextLCD/TextLCD.cpp@0:5bf7e3564c3b, 2012-06-17 (annotated)

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