Elmicro_Testbed_LCD - Based on the NewTextLib, I made a modification fo…

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Ton van de Pol / Mbed 2 deprecated Elmicro_Testbed_LCD

Based on the NewTextLib, I made a modification for using this lib on the Elmicro Testbed with display GDM2004D

NewTextLCD.cpp@0:9c69fa6c1120, 2011-06-11 (annotated)

Committer:: TP
Date:: Sat Jun 11 20:34:14 2011 +0000
Revision:: 0:9c69fa6c1120

Who changed what in which revision?

User	Revision	Line number	New contents of line
TP	0:9c69fa6c1120	1	/* mbed TextLCD Library, for a 4-bit LCD based on HD44780
TP	0:9c69fa6c1120	2	* Copyright (c) 2007-2010, sford, http://mbed.org
TP	0:9c69fa6c1120	3	* Changes by Erik Kerger
TP	0:9c69fa6c1120	4	*
TP	0:9c69fa6c1120	5	*
TP	0:9c69fa6c1120	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
TP	0:9c69fa6c1120	7	* of this software and associated documentation files (the "Software"), to deal
TP	0:9c69fa6c1120	8	* in the Software without restriction, including without limitation the rights
TP	0:9c69fa6c1120	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
TP	0:9c69fa6c1120	10	* copies of the Software, and to permit persons to whom the Software is
TP	0:9c69fa6c1120	11	* furnished to do so, subject to the following conditions:
TP	0:9c69fa6c1120	12	*
TP	0:9c69fa6c1120	13	* The above copyright notice and this permission notice shall be included in
TP	0:9c69fa6c1120	14	* all copies or substantial portions of the Software.
TP	0:9c69fa6c1120	15	*
TP	0:9c69fa6c1120	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
TP	0:9c69fa6c1120	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
TP	0:9c69fa6c1120	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
TP	0:9c69fa6c1120	19	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
TP	0:9c69fa6c1120	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
TP	0:9c69fa6c1120	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
TP	0:9c69fa6c1120	22	* THE SOFTWARE.
TP	0:9c69fa6c1120	23	*/
TP	0:9c69fa6c1120	24
TP	0:9c69fa6c1120	25	#include "NewTextLCD.h"
TP	0:9c69fa6c1120	26	#include "mbed.h"
TP	0:9c69fa6c1120	27
TP	0:9c69fa6c1120	28	TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d4, PinName d5,
TP	0:9c69fa6c1120	29	PinName d6, PinName d7, LCDType type) : _rs(rs), _rw(rw), _e(e),
TP	0:9c69fa6c1120	30	_d(d4, d5, d6, d7), _type(type) {
TP	0:9c69fa6c1120	31	_rs = 0; // command mode
TP	0:9c69fa6c1120	32	_rw = 0; // r/w in defined state
TP	0:9c69fa6c1120	33	_e = 0; // 0 --> inactive (most important change to original TextLCD)
TP	0:9c69fa6c1120	34
TP	0:9c69fa6c1120	35	if (_type != LCDuser)
TP	0:9c69fa6c1120	36	setLCDparam(_type); // otherwise rows, colums, comdelay, adresses must be set before
TP	0:9c69fa6c1120	37
TP	0:9c69fa6c1120	38	wait(0.050f); // Wait 50ms to ensure powered up
TP	0:9c69fa6c1120	39
TP	0:9c69fa6c1120	40	// send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
TP	0:9c69fa6c1120	41	// this sets controler into 8 bit mode, so we have a defined state
TP	0:9c69fa6c1120	42	for (int i=0; i<3; i++) {
TP	0:9c69fa6c1120	43	_e = 1;
TP	0:9c69fa6c1120	44	__nop();
TP	0:9c69fa6c1120	45	__nop();
TP	0:9c69fa6c1120	46	_d = 0x3;
TP	0:9c69fa6c1120	47	__nop(); // data setup time at least 60 ns
TP	0:9c69fa6c1120	48	_e = 0;
TP	0:9c69fa6c1120	49	wait(0.005f); // 5ms
TP	0:9c69fa6c1120	50	}
TP	0:9c69fa6c1120	51	_e = 1;
TP	0:9c69fa6c1120	52	__nop();
TP	0:9c69fa6c1120	53	__nop();
TP	0:9c69fa6c1120	54	_d = 0x2; // 4 Bit mode (after this command, we have to send 2 nibbles)
TP	0:9c69fa6c1120	55	__nop();
TP	0:9c69fa6c1120	56	_e = 0;
TP	0:9c69fa6c1120	57	wait_us(LCDparam.delay);
TP	0:9c69fa6c1120	58
TP	0:9c69fa6c1120	59	writeCommand(0x28); // Function set 4 Bit, 2Line, 5*7
TP	0:9c69fa6c1120	60	writeCommand(0x08); // Display off
TP	0:9c69fa6c1120	61	cls(); // clear display, reset _column and _row
TP	0:9c69fa6c1120	62	writeCommand(0x04); // cursor right, Display is not shifted
TP	0:9c69fa6c1120	63	writeCommand(0x0C); // Display on , Cursor off
TP	0:9c69fa6c1120	64	}
TP	0:9c69fa6c1120	65
TP	0:9c69fa6c1120	66	void TextLCD::character(int column, int row, int c) {
TP	0:9c69fa6c1120	67	int a = 0x80 \| (LCDparam.adresses[row & 3] + column);
TP	0:9c69fa6c1120	68	writeCommand(a); // set cursor address
TP	0:9c69fa6c1120	69	writeData(c); // write char
TP	0:9c69fa6c1120	70	}
TP	0:9c69fa6c1120	71
TP	0:9c69fa6c1120	72	void TextLCD::cls() {
TP	0:9c69fa6c1120	73	writeCommand(0x01); // cls, and set cursor to 0
TP	0:9c69fa6c1120	74	locate(0, 0); // set internal position
TP	0:9c69fa6c1120	75	wait_us(45 * LCDparam.delay); // CLS need much time
TP	0:9c69fa6c1120	76	}
TP	0:9c69fa6c1120	77
TP	0:9c69fa6c1120	78	void TextLCD::locate(int column, int row) {
TP	0:9c69fa6c1120	79	_column = column; // set position for next char
TP	0:9c69fa6c1120	80	_row = row; // note: cursor is not set yet
TP	0:9c69fa6c1120	81	}
TP	0:9c69fa6c1120	82
TP	0:9c69fa6c1120	83
TP	0:9c69fa6c1120	84
TP	0:9c69fa6c1120	85	int TextLCD::_putc(int value) {
TP	0:9c69fa6c1120	86	if (value == '\n') {
TP	0:9c69fa6c1120	87	_column = 0;
TP	0:9c69fa6c1120	88	_row++;
TP	0:9c69fa6c1120	89	if (_row >= LCDparam.rows) {
TP	0:9c69fa6c1120	90	_row = 0;
TP	0:9c69fa6c1120	91	}
TP	0:9c69fa6c1120	92	} else {
TP	0:9c69fa6c1120	93	character(_column, _row, value);
TP	0:9c69fa6c1120	94	_column++;
TP	0:9c69fa6c1120	95	if (_column >= LCDparam.columns) {
TP	0:9c69fa6c1120	96	_column = 0;
TP	0:9c69fa6c1120	97	_row++;
TP	0:9c69fa6c1120	98	if (_row >= LCDparam.rows) {
TP	0:9c69fa6c1120	99	_row = 0;
TP	0:9c69fa6c1120	100	}
TP	0:9c69fa6c1120	101	}
TP	0:9c69fa6c1120	102	}
TP	0:9c69fa6c1120	103	return value;
TP	0:9c69fa6c1120	104	}
TP	0:9c69fa6c1120	105
TP	0:9c69fa6c1120	106	// Dummy function - read not supported
TP	0:9c69fa6c1120	107	int TextLCD::_getc() {
TP	0:9c69fa6c1120	108	return -1;
TP	0:9c69fa6c1120	109	}
TP	0:9c69fa6c1120	110
TP	0:9c69fa6c1120	111	void TextLCD::writeByte(int value) {
TP	0:9c69fa6c1120	112	_e = 1;
TP	0:9c69fa6c1120	113	__nop();
TP	0:9c69fa6c1120	114	_d = value >> 4; // higher nibble first
TP	0:9c69fa6c1120	115	__nop();
TP	0:9c69fa6c1120	116	_e = 0;
TP	0:9c69fa6c1120	117	__nop();
TP	0:9c69fa6c1120	118	__nop();
TP	0:9c69fa6c1120	119	_e = 1;
TP	0:9c69fa6c1120	120	__nop();
TP	0:9c69fa6c1120	121	_d = value >> 0; // then lower
TP	0:9c69fa6c1120	122	__nop();
TP	0:9c69fa6c1120	123	_e = 0;
TP	0:9c69fa6c1120	124	}
TP	0:9c69fa6c1120	125
TP	0:9c69fa6c1120	126	void TextLCD::writeCommand(int command) {
TP	0:9c69fa6c1120	127	_rs = 0;
TP	0:9c69fa6c1120	128	writeByte(command);
TP	0:9c69fa6c1120	129	wait_us(LCDparam.delay);
TP	0:9c69fa6c1120	130	}
TP	0:9c69fa6c1120	131
TP	0:9c69fa6c1120	132
TP	0:9c69fa6c1120	133	void TextLCD::writeData(int data) {
TP	0:9c69fa6c1120	134	_rs = 1;
TP	0:9c69fa6c1120	135	writeByte(data);
TP	0:9c69fa6c1120	136	wait_us(LCDparam.delay);
TP	0:9c69fa6c1120	137	}
TP	0:9c69fa6c1120	138
TP	0:9c69fa6c1120	139
TP	0:9c69fa6c1120	140	// set user defined char
TP	0:9c69fa6c1120	141	void TextLCD::writeCGRAM(int address, int pattern[8]){
TP	0:9c69fa6c1120	142	int i;
TP	0:9c69fa6c1120	143	address = address & 7; //max 8 char
TP	0:9c69fa6c1120	144	for(i=0;i<8;i++){
TP	0:9c69fa6c1120	145	writeCommand(0x40 \| (address * 8) + i);
TP	0:9c69fa6c1120	146	writeData(pattern[i]);
TP	0:9c69fa6c1120	147	}
TP	0:9c69fa6c1120	148	}
TP	0:9c69fa6c1120	149
TP	0:9c69fa6c1120	150	void TextLCD::setLCDparam(LCDType _type){
TP	0:9c69fa6c1120	151	switch (_type) {
TP	0:9c69fa6c1120	152
TP	0:9c69fa6c1120	153	case LCD16x2:
TP	0:9c69fa6c1120	154	case LCD16x2B:
TP	0:9c69fa6c1120	155	LCDparam.columns = 16;
TP	0:9c69fa6c1120	156	break;
TP	0:9c69fa6c1120	157	case LCD20x2:
TP	0:9c69fa6c1120	158	case LCD20x4:
TP	0:9c69fa6c1120	159	LCDparam.columns = 20;
TP	0:9c69fa6c1120	160	break;
TP	0:9c69fa6c1120	161	case LCD24x2:
TP	0:9c69fa6c1120	162	LCDparam.columns = 24;
TP	0:9c69fa6c1120	163	break;
TP	0:9c69fa6c1120	164	}
TP	0:9c69fa6c1120	165	if (_type == LCD20x4)
TP	0:9c69fa6c1120	166	LCDparam.rows = 4;
TP	0:9c69fa6c1120	167	else
TP	0:9c69fa6c1120	168	LCDparam.rows = 2;
TP	0:9c69fa6c1120	169
TP	0:9c69fa6c1120	170	LCDparam.adresses[0] = 0;
TP	0:9c69fa6c1120	171
TP	0:9c69fa6c1120	172	if (_type == LCD16x2B)
TP	0:9c69fa6c1120	173	LCDparam.adresses[1] = 40;
TP	0:9c69fa6c1120	174	else
TP	0:9c69fa6c1120	175	LCDparam.adresses[1] = 0x40;
TP	0:9c69fa6c1120	176
TP	0:9c69fa6c1120	177	if (_type == LCD20x4) {
TP	0:9c69fa6c1120	178	LCDparam.adresses[2] = 0x14;
TP	0:9c69fa6c1120	179	LCDparam.adresses[3] = 0x54;}
TP	0:9c69fa6c1120	180	else {
TP	0:9c69fa6c1120	181	LCDparam.adresses[2] = 0;
TP	0:9c69fa6c1120	182	LCDparam.adresses[3] = 0;}
TP	0:9c69fa6c1120	183
TP	0:9c69fa6c1120	184	LCDparam.delay = 50; // 50 us delays as default
TP	0:9c69fa6c1120	185	}
TP	0:9c69fa6c1120	186

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	11 Jun 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

NewTextLCD.cpp@0:9c69fa6c1120, 2011-06-11 (annotated)

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