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Takeuchi Kouichi / Mbed 2 deprecated 2bk0817_servo_test04

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TextLCD0420.cpp@0:04604e1f2302, 2011-08-18 (annotated)

Committer:: takeuchi
Date:: Thu Aug 18 23:17:04 2011 +0000
Revision:: 0:04604e1f2302

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User	Revision	Line number	New contents of line
takeuchi	0:04604e1f2302	1	/* mbed TextLCD Library
takeuchi	0:04604e1f2302	2	* Copyright (c) 2007-2009 sford
takeuchi	0:04604e1f2302	3	* Released under the MIT License: http://mbed.org/license/mit
takeuchi	0:04604e1f2302	4	*/
takeuchi	0:04604e1f2302	5	// for 04row*20line LCD
takeuchi	0:04604e1f2302	6
takeuchi	0:04604e1f2302	7	#include "TextLCD0420.h"
takeuchi	0:04604e1f2302	8
takeuchi	0:04604e1f2302	9	#include "mbed.h"
takeuchi	0:04604e1f2302	10	#include "error.h"
takeuchi	0:04604e1f2302	11
takeuchi	0:04604e1f2302	12	using namespace mbed;
takeuchi	0:04604e1f2302	13
takeuchi	0:04604e1f2302	14	/*
takeuchi	0:04604e1f2302	15	* useful info found at http://www.a-netz.de/lcd.en.php
takeuchi	0:04604e1f2302	16	*
takeuchi	0:04604e1f2302	17	*
takeuchi	0:04604e1f2302	18	* Initialisation
takeuchi	0:04604e1f2302	19	* ==============
takeuchi	0:04604e1f2302	20	*
takeuchi	0:04604e1f2302	21	* After attaching the supply voltage/after a reset, the display needs to be brought in to a defined state
takeuchi	0:04604e1f2302	22	*
takeuchi	0:04604e1f2302	23	* - wait approximately 15 ms so the display is ready to execute commands
takeuchi	0:04604e1f2302	24	* - Execute the command 0x30 ("Display Settings") three times (wait 1,64ms after each command, the busy flag cannot be queried now).
takeuchi	0:04604e1f2302	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	0:04604e1f2302	26	* - If you want to use the 4 bit mode, now you can execute the command to switch over to this mode now.
takeuchi	0:04604e1f2302	27	* - Execute the "clear display" command
takeuchi	0:04604e1f2302	28	*
takeuchi	0:04604e1f2302	29	* Timing
takeuchi	0:04604e1f2302	30	* ======
takeuchi	0:04604e1f2302	31	*
takeuchi	0:04604e1f2302	32	* Nearly all commands transmitted to the display need 40us for execution.
takeuchi	0:04604e1f2302	33	* Exceptions are the commands "Clear Display and Reset" and "Set Cursor to Start Position"
takeuchi	0:04604e1f2302	34	* These commands need 1.64ms for execution. These timings are valid for all displays working with an
takeuchi	0:04604e1f2302	35	* internal clock of 250kHz. But I do not know any displays that use other frequencies. Any time you
takeuchi	0:04604e1f2302	36	* can use the busy flag to test if the display is ready to accept the next command.
takeuchi	0:04604e1f2302	37	*
takeuchi	0:04604e1f2302	38	* _e is kept high apart from calling clock
takeuchi	0:04604e1f2302	39	* _rw is kept 0 (write) apart from actions that uyse it differently
takeuchi	0:04604e1f2302	40	* _rs is set by the data/command writes
takeuchi	0:04604e1f2302	41	*/
takeuchi	0:04604e1f2302	42
takeuchi	0:04604e1f2302	43	TextLCD::TextLCD(PinName rs, PinName rw, PinName e, PinName d0, PinName d1,
takeuchi	0:04604e1f2302	44	PinName d2, PinName d3, int columns, int rows) : _rw(rw), _rs(rs),
takeuchi	0:04604e1f2302	45	_e(e), _d(d0, d1, d2, d3), _columns(columns), _rows(rows) {
takeuchi	0:04604e1f2302	46
takeuchi	0:04604e1f2302	47
takeuchi	0:04604e1f2302	48	// Mon, 27 Apr 2009 23:32:34 +0200
takeuchi	0:04604e1f2302	49	// Kevin Konradt:
takeuchi	0:04604e1f2302	50	// When using a LCD with 1 row x 16 characters
takeuchi	0:04604e1f2302	51	// instead of 2x16, try changing _columns to 8.
takeuchi	0:04604e1f2302	52	// (display seems to split the 16 characters into
takeuchi	0:04604e1f2302	53	// 2 virtual rows with 8 characters each.)
takeuchi	0:04604e1f2302	54
takeuchi	0:04604e1f2302	55	_rw = 0;
takeuchi	0:04604e1f2302	56	_e = 1;
takeuchi	0:04604e1f2302	57	_rs = 0; // command mode
takeuchi	0:04604e1f2302	58
takeuchi	0:04604e1f2302	59	// Should theoretically wait 15ms, but most things will be powered up pre-reset
takeuchi	0:04604e1f2302	60	// so i'll disable that for the minute. If implemented, could wait 15ms post reset
takeuchi	0:04604e1f2302	61	// instead
takeuchi	0:04604e1f2302	62	// wait(0.015);
takeuchi	0:04604e1f2302	63
takeuchi	0:04604e1f2302	64	// send "Display Settings" 3 times (Only top nibble of 0x30 as we've got 4-bit bus)
takeuchi	0:04604e1f2302	65	for(int i=0; i<3; i++) {
takeuchi	0:04604e1f2302	66	writeNibble(0x3);
takeuchi	0:04604e1f2302	67	wait(0.00164); // this command takes 1.64ms, so wait for it
takeuchi	0:04604e1f2302	68	}
takeuchi	0:04604e1f2302	69	writeNibble(0x2); // 4-bit mode
takeuchi	0:04604e1f2302	70
takeuchi	0:04604e1f2302	71	writeCommand(0x28); // Function set 001 BW N F - -
takeuchi	0:04604e1f2302	72	writeCommand(0x0C);
takeuchi	0:04604e1f2302	73	writeCommand(0x6); // Cursor Direction and Display Shift : 0000 01 CD S (CD 0-left, 1-right S(hift) 0-no, 1-yes
takeuchi	0:04604e1f2302	74
takeuchi	0:04604e1f2302	75	cls();
takeuchi	0:04604e1f2302	76	}
takeuchi	0:04604e1f2302	77
takeuchi	0:04604e1f2302	78	int TextLCD::_putc(int value) {
takeuchi	0:04604e1f2302	79	if(value == '\n') {
takeuchi	0:04604e1f2302	80	newline();
takeuchi	0:04604e1f2302	81	} else {
takeuchi	0:04604e1f2302	82	writeData(value);
takeuchi	0:04604e1f2302	83	}
takeuchi	0:04604e1f2302	84	return value;
takeuchi	0:04604e1f2302	85	}
takeuchi	0:04604e1f2302	86
takeuchi	0:04604e1f2302	87	int TextLCD::_getc() {
takeuchi	0:04604e1f2302	88	return 0;
takeuchi	0:04604e1f2302	89	}
takeuchi	0:04604e1f2302	90
takeuchi	0:04604e1f2302	91	void TextLCD::newline() {
takeuchi	0:04604e1f2302	92	_column = 0;
takeuchi	0:04604e1f2302	93	_row++;
takeuchi	0:04604e1f2302	94	if(_row >= _rows) {
takeuchi	0:04604e1f2302	95	_row = 0;
takeuchi	0:04604e1f2302	96	}
takeuchi	0:04604e1f2302	97	locate(_column, _row);
takeuchi	0:04604e1f2302	98	}
takeuchi	0:04604e1f2302	99
takeuchi	0:04604e1f2302	100	void TextLCD::locate(int column, int row) {
takeuchi	0:04604e1f2302	101	int address;
takeuchi	0:04604e1f2302	102	if(column < 0 \|\| column >= _columns \|\| row < 0 \|\| row >= _rows) {
takeuchi	0:04604e1f2302	103	error("locate(%d,%d) out of range on %dx%d display", column, row, _columns, _rows);
takeuchi	0:04604e1f2302	104	return;
takeuchi	0:04604e1f2302	105	}
takeuchi	0:04604e1f2302	106
takeuchi	0:04604e1f2302	107	_row = row;
takeuchi	0:04604e1f2302	108	_column = column;
takeuchi	0:04604e1f2302	109	// 0220 => int address = 0x80 + (_row 40) + _column; // memory starts at 0x80, and is 40 chars long per row
takeuchi	0:04604e1f2302	110
takeuchi	0:04604e1f2302	111
takeuchi	0:04604e1f2302	112	if(_row == 0 ){
takeuchi	0:04604e1f2302	113	address = 0x80+_column;
takeuchi	0:04604e1f2302	114	}
takeuchi	0:04604e1f2302	115	else if(_row == 1 ){
takeuchi	0:04604e1f2302	116	address = 0x80+ (0x40) + _column;
takeuchi	0:04604e1f2302	117	}
takeuchi	0:04604e1f2302	118	else if(_row == 2){
takeuchi	0:04604e1f2302	119	address = 0x80+(0x14)+_column;
takeuchi	0:04604e1f2302	120	}
takeuchi	0:04604e1f2302	121	else if(_row == 3){
takeuchi	0:04604e1f2302	122	address = 0x80+(0x54)+_column;
takeuchi	0:04604e1f2302	123	}
takeuchi	0:04604e1f2302	124
takeuchi	0:04604e1f2302	125	writeCommand(address);
takeuchi	0:04604e1f2302	126	}
takeuchi	0:04604e1f2302	127
takeuchi	0:04604e1f2302	128	void TextLCD::cls() {
takeuchi	0:04604e1f2302	129	writeCommand(0x01); // Clear Display
takeuchi	0:04604e1f2302	130	wait(0.00164f); // This command takes 1.64 ms
takeuchi	0:04604e1f2302	131	locate(0, 0);
takeuchi	0:04604e1f2302	132	}
takeuchi	0:04604e1f2302	133
takeuchi	0:04604e1f2302	134	void TextLCD::reset() {
takeuchi	0:04604e1f2302	135	cls();
takeuchi	0:04604e1f2302	136	}
takeuchi	0:04604e1f2302	137
takeuchi	0:04604e1f2302	138	void TextLCD::clock() {
takeuchi	0:04604e1f2302	139	wait(0.000040f);
takeuchi	0:04604e1f2302	140	_e = 0;
takeuchi	0:04604e1f2302	141	wait(0.000040f); // most instructions take 40us
takeuchi	0:04604e1f2302	142	_e = 1;
takeuchi	0:04604e1f2302	143	}
takeuchi	0:04604e1f2302	144
takeuchi	0:04604e1f2302	145	void TextLCD::writeNibble(int value) {
takeuchi	0:04604e1f2302	146	_d = value;
takeuchi	0:04604e1f2302	147	clock();
takeuchi	0:04604e1f2302	148	}
takeuchi	0:04604e1f2302	149
takeuchi	0:04604e1f2302	150	void TextLCD::writeByte(int value) {
takeuchi	0:04604e1f2302	151	writeNibble(value >> 4);
takeuchi	0:04604e1f2302	152	writeNibble(value >> 0);
takeuchi	0:04604e1f2302	153	}
takeuchi	0:04604e1f2302	154
takeuchi	0:04604e1f2302	155	void TextLCD::writeCommand(int command) {
takeuchi	0:04604e1f2302	156	_rs = 0;
takeuchi	0:04604e1f2302	157	writeByte(command);
takeuchi	0:04604e1f2302	158	}
takeuchi	0:04604e1f2302	159
takeuchi	0:04604e1f2302	160	void TextLCD::writeData(int data) {
takeuchi	0:04604e1f2302	161	_rs = 1;
takeuchi	0:04604e1f2302	162	writeByte(data);
takeuchi	0:04604e1f2302	163	_column++;
takeuchi	0:04604e1f2302	164	if(_column >= _columns) {
takeuchi	0:04604e1f2302	165	newline();
takeuchi	0:04604e1f2302	166	}
takeuchi	0:04604e1f2302	167	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	18 Aug 2011
Imports:	7
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

TextLCD0420.cpp@0:04604e1f2302, 2011-08-18 (annotated)

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