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Takeuchi Kouichi / Mbed 2 deprecated 2ck0111_RMCS02

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TextLCD0420.cpp@0:679ed6de4c01, 2012-01-19 (annotated)

Committer:: takeuchi
Date:: Thu Jan 19 00:48:16 2012 +0000
Revision:: 0:679ed6de4c01

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User	Revision	Line number	New contents of line
takeuchi	0:679ed6de4c01	1	/* mbed TextLCD Library
takeuchi	0:679ed6de4c01	2	* Copyright (c) 2007-2009 sford
takeuchi	0:679ed6de4c01	3	* Released under the MIT License: http://mbed.org/license/mit
takeuchi	0:679ed6de4c01	4	*/
takeuchi	0:679ed6de4c01	5	// for 04row*20line LCD
takeuchi	0:679ed6de4c01	6
takeuchi	0:679ed6de4c01	7	#include "TextLCD0420.h"
takeuchi	0:679ed6de4c01	8
takeuchi	0:679ed6de4c01	9	#include "mbed.h"
takeuchi	0:679ed6de4c01	10	#include "error.h"
takeuchi	0:679ed6de4c01	11
takeuchi	0:679ed6de4c01	12	using namespace mbed;
takeuchi	0:679ed6de4c01	13
takeuchi	0:679ed6de4c01	14	/*
takeuchi	0:679ed6de4c01	15	* useful info found at http://www.a-netz.de/lcd.en.php
takeuchi	0:679ed6de4c01	16	*
takeuchi	0:679ed6de4c01	17	*
takeuchi	0:679ed6de4c01	18	* Initialisation
takeuchi	0:679ed6de4c01	19	* ==============
takeuchi	0:679ed6de4c01	20	*
takeuchi	0:679ed6de4c01	21	* After attaching the supply voltage/after a reset, the display needs to be brought in to a defined state
takeuchi	0:679ed6de4c01	22	*
takeuchi	0:679ed6de4c01	23	* - wait approximately 15 ms so the display is ready to execute commands
takeuchi	0:679ed6de4c01	24	* - Execute the command 0x30 ("Display Settings") three times (wait 1,64ms after each command, the busy flag cannot be queried now).
takeuchi	0:679ed6de4c01	25	* - The display is in 8 bit mode, so if you have only connected 4 data pins you should only transmit the higher nibble of each command.
takeuchi	0:679ed6de4c01	26	* - If you want to use the 4 bit mode, now you can execute the command to switch over to this mode now.
takeuchi	0:679ed6de4c01	27	* - Execute the "clear display" command
takeuchi	0:679ed6de4c01	28	*
takeuchi	0:679ed6de4c01	29	* Timing
takeuchi	0:679ed6de4c01	30	* ======
takeuchi	0:679ed6de4c01	31	*
takeuchi	0:679ed6de4c01	32	* Nearly all commands transmitted to the display need 40us for execution.
takeuchi	0:679ed6de4c01	33	* Exceptions are the commands "Clear Display and Reset" and "Set Cursor to Start Position"
takeuchi	0:679ed6de4c01	34	* These commands need 1.64ms for execution. These timings are valid for all displays working with an
takeuchi	0:679ed6de4c01	35	* internal clock of 250kHz. But I do not know any displays that use other frequencies. Any time you
takeuchi	0:679ed6de4c01	36	* can use the busy flag to test if the display is ready to accept the next command.
takeuchi	0:679ed6de4c01	37	*
takeuchi	0:679ed6de4c01	38	* _e is kept high apart from calling clock
takeuchi	0:679ed6de4c01	39	* _rw is kept 0 (write) apart from actions that uyse it differently
takeuchi	0:679ed6de4c01	40	* _rs is set by the data/command writes
takeuchi	0:679ed6de4c01	41	*/
takeuchi	0:679ed6de4c01	42
takeuchi	0:679ed6de4c01	43	TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1,
takeuchi	0:679ed6de4c01	44	PinName d2, PinName d3, int columns, int rows) : _rw(rw), _rs(rs),
takeuchi	0:679ed6de4c01	45	_e(e), _d(d0, d1, d2, d3), _columns(columns), _rows(rows) {
takeuchi	0:679ed6de4c01	46
takeuchi	0:679ed6de4c01	47
takeuchi	0:679ed6de4c01	48	// Mon, 27 Apr 2009 23:32:34 +0200
takeuchi	0:679ed6de4c01	49	// Kevin Konradt:
takeuchi	0:679ed6de4c01	50	// When using a LCD with 1 row x 16 characters
takeuchi	0:679ed6de4c01	51	// instead of 2x16, try changing _columns to 8.
takeuchi	0:679ed6de4c01	52	// (display seems to split the 16 characters into
takeuchi	0:679ed6de4c01	53	// 2 virtual rows with 8 characters each.)
takeuchi	0:679ed6de4c01	54
takeuchi	0:679ed6de4c01	55	_rw = 0;
takeuchi	0:679ed6de4c01	56	_e = 1;
takeuchi	0:679ed6de4c01	57	_rs = 0; // command mode
takeuchi	0:679ed6de4c01	58
takeuchi	0:679ed6de4c01	59	// Should theoretically wait 15ms, but most things will be powered up pre-reset
takeuchi	0:679ed6de4c01	60	// so i'll disable that for the minute. If implemented, could wait 15ms post reset
takeuchi	0:679ed6de4c01	61	// instead
takeuchi	0:679ed6de4c01	62	// wait(0.015);
takeuchi	0:679ed6de4c01	63
takeuchi	0:679ed6de4c01	64	// send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
takeuchi	0:679ed6de4c01	65	for(int i=0; i<3; i++) {
takeuchi	0:679ed6de4c01	66	writeNibble(0x3);
takeuchi	0:679ed6de4c01	67	wait(0.00164); // this command takes 1.64ms, so wait for it
takeuchi	0:679ed6de4c01	68	}
takeuchi	0:679ed6de4c01	69	writeNibble(0x2); // 4-bit mode
takeuchi	0:679ed6de4c01	70
takeuchi	0:679ed6de4c01	71	writeCommand(0x28); // Function set 001 BW N F - -
takeuchi	0:679ed6de4c01	72	writeCommand(0x0C);
takeuchi	0:679ed6de4c01	73	writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
takeuchi	0:679ed6de4c01	74
takeuchi	0:679ed6de4c01	75	cls();
takeuchi	0:679ed6de4c01	76	}
takeuchi	0:679ed6de4c01	77
takeuchi	0:679ed6de4c01	78	int TextLCD::_putc(int value) {
takeuchi	0:679ed6de4c01	79	if(value == '\n') {
takeuchi	0:679ed6de4c01	80	newline();
takeuchi	0:679ed6de4c01	81	} else {
takeuchi	0:679ed6de4c01	82	writeData(value);
takeuchi	0:679ed6de4c01	83	}
takeuchi	0:679ed6de4c01	84	return value;
takeuchi	0:679ed6de4c01	85	}
takeuchi	0:679ed6de4c01	86
takeuchi	0:679ed6de4c01	87	int TextLCD::_getc() {
takeuchi	0:679ed6de4c01	88	return 0;
takeuchi	0:679ed6de4c01	89	}
takeuchi	0:679ed6de4c01	90
takeuchi	0:679ed6de4c01	91	void TextLCD::newline() {
takeuchi	0:679ed6de4c01	92	_column = 0;
takeuchi	0:679ed6de4c01	93	_row++;
takeuchi	0:679ed6de4c01	94	if(_row >= _rows) {
takeuchi	0:679ed6de4c01	95	_row = 0;
takeuchi	0:679ed6de4c01	96	}
takeuchi	0:679ed6de4c01	97	locate(_column, _row);
takeuchi	0:679ed6de4c01	98	}
takeuchi	0:679ed6de4c01	99
takeuchi	0:679ed6de4c01	100	void TextLCD::locate(int column, int row) {
takeuchi	0:679ed6de4c01	101	int address;
takeuchi	0:679ed6de4c01	102	if(column < 0 \|\| column >= _columns \|\| row < 0 \|\| row >= _rows) {
takeuchi	0:679ed6de4c01	103	error("locate(%d,%d) out of range on %dx%d display", column, row, _columns, _rows);
takeuchi	0:679ed6de4c01	104	return;
takeuchi	0:679ed6de4c01	105	}
takeuchi	0:679ed6de4c01	106
takeuchi	0:679ed6de4c01	107	_row = row;
takeuchi	0:679ed6de4c01	108	_column = column;
takeuchi	0:679ed6de4c01	109	// 0220 => int address = 0x80 + (_row 40) + _column; // memory starts at 0x80, and is 40 chars long per row
takeuchi	0:679ed6de4c01	110
takeuchi	0:679ed6de4c01	111
takeuchi	0:679ed6de4c01	112	if(_row == 0 ){
takeuchi	0:679ed6de4c01	113	address = 0x80+_column;
takeuchi	0:679ed6de4c01	114	}
takeuchi	0:679ed6de4c01	115	else if(_row == 1 ){
takeuchi	0:679ed6de4c01	116	address = 0x80+ (0x40) + _column;
takeuchi	0:679ed6de4c01	117	}
takeuchi	0:679ed6de4c01	118	else if(_row == 2){
takeuchi	0:679ed6de4c01	119	address = 0x80+(0x14)+_column;
takeuchi	0:679ed6de4c01	120	}
takeuchi	0:679ed6de4c01	121	else if(_row == 3){
takeuchi	0:679ed6de4c01	122	address = 0x80+(0x54)+_column;
takeuchi	0:679ed6de4c01	123	}
takeuchi	0:679ed6de4c01	124
takeuchi	0:679ed6de4c01	125	writeCommand(address);
takeuchi	0:679ed6de4c01	126	}
takeuchi	0:679ed6de4c01	127
takeuchi	0:679ed6de4c01	128	void TextLCD::cls() {
takeuchi	0:679ed6de4c01	129	writeCommand(0x01); // Clear Display
takeuchi	0:679ed6de4c01	130	wait(0.00164f); // This command takes 1.64 ms
takeuchi	0:679ed6de4c01	131	locate(0, 0);
takeuchi	0:679ed6de4c01	132	}
takeuchi	0:679ed6de4c01	133
takeuchi	0:679ed6de4c01	134	void TextLCD::reset() {
takeuchi	0:679ed6de4c01	135	cls();
takeuchi	0:679ed6de4c01	136	}
takeuchi	0:679ed6de4c01	137
takeuchi	0:679ed6de4c01	138	void TextLCD::clock() {
takeuchi	0:679ed6de4c01	139	wait(0.000040f);
takeuchi	0:679ed6de4c01	140	_e = 0;
takeuchi	0:679ed6de4c01	141	wait(0.000040f); // most instructions take 40us
takeuchi	0:679ed6de4c01	142	_e = 1;
takeuchi	0:679ed6de4c01	143	}
takeuchi	0:679ed6de4c01	144
takeuchi	0:679ed6de4c01	145	void TextLCD::writeNibble(int value) {
takeuchi	0:679ed6de4c01	146	_d = value;
takeuchi	0:679ed6de4c01	147	clock();
takeuchi	0:679ed6de4c01	148	}
takeuchi	0:679ed6de4c01	149
takeuchi	0:679ed6de4c01	150	void TextLCD::writeByte(int value) {
takeuchi	0:679ed6de4c01	151	writeNibble(value >> 4);
takeuchi	0:679ed6de4c01	152	writeNibble(value >> 0);
takeuchi	0:679ed6de4c01	153	}
takeuchi	0:679ed6de4c01	154
takeuchi	0:679ed6de4c01	155	void TextLCD::writeCommand(int command) {
takeuchi	0:679ed6de4c01	156	_rs = 0;
takeuchi	0:679ed6de4c01	157	writeByte(command);
takeuchi	0:679ed6de4c01	158	}
takeuchi	0:679ed6de4c01	159
takeuchi	0:679ed6de4c01	160	void TextLCD::writeData(int data) {
takeuchi	0:679ed6de4c01	161	_rs = 1;
takeuchi	0:679ed6de4c01	162	writeByte(data);
takeuchi	0:679ed6de4c01	163	_column++;
takeuchi	0:679ed6de4c01	164	if(_column >= _columns) {
takeuchi	0:679ed6de4c01	165	newline();
takeuchi	0:679ed6de4c01	166	}
takeuchi	0:679ed6de4c01	167	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	19 Jan 2012
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

TextLCD0420.cpp@0:679ed6de4c01, 2012-01-19 (annotated)

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