LCD - Strawberry Linux LCD module interface

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Strawberry Linux LCD module interface

LCD.cpp@0:b3def1d4f466, 2011-12-22 (annotated)

Committer:: yamaguch
Date:: Thu Dec 22 06:12:07 2011 +0000
Revision:: 0:b3def1d4f466

Who changed what in which revision?

User	Revision	Line number	New contents of line
yamaguch	0:b3def1d4f466	1	#include "LCD.h"
yamaguch	0:b3def1d4f466	2	#include "mbed.h"
yamaguch	0:b3def1d4f466	3
yamaguch	0:b3def1d4f466	4	#define I2C_ADDR 0x7C
yamaguch	0:b3def1d4f466	5
yamaguch	0:b3def1d4f466	6	#define COLUMNS 16
yamaguch	0:b3def1d4f466	7	#define ROWS 2
yamaguch	0:b3def1d4f466	8
yamaguch	0:b3def1d4f466	9	#define COMMAND 0x00
yamaguch	0:b3def1d4f466	10	#define DATA 0x40
yamaguch	0:b3def1d4f466	11
yamaguch	0:b3def1d4f466	12	// Clear Display
yamaguch	0:b3def1d4f466	13	#define CLEAR_DISPLAY 0x01
yamaguch	0:b3def1d4f466	14
yamaguch	0:b3def1d4f466	15	// Return Home
yamaguch	0:b3def1d4f466	16	#define RETURN_HOME 0x02
yamaguch	0:b3def1d4f466	17
yamaguch	0:b3def1d4f466	18	// Display ON/OFF
yamaguch	0:b3def1d4f466	19	#define DISPLAY_ON_OFF_CONTROL 0x08
yamaguch	0:b3def1d4f466	20	#define DISPLAY_ON 1 << 2
yamaguch	0:b3def1d4f466	21	#define CURSOR_ON 1 << 1
yamaguch	0:b3def1d4f466	22	#define CURSOR_POSITION_ON 1 << 0
yamaguch	0:b3def1d4f466	23
yamaguch	0:b3def1d4f466	24	// Function set
yamaguch	0:b3def1d4f466	25	#define FUNCTION_SET 0x20
yamaguch	0:b3def1d4f466	26	#define DL 1 << 4 // 8 bit interface
yamaguch	0:b3def1d4f466	27	#define N 1 << 3 // 2 lines
yamaguch	0:b3def1d4f466	28	#define DH 1 << 2 // double height
yamaguch	0:b3def1d4f466	29	#define IS 1 << 0 // instruction table select
yamaguch	0:b3def1d4f466	30
yamaguch	0:b3def1d4f466	31	// Instruction Table 0 (IS = 0)
yamaguch	0:b3def1d4f466	32	#define CURSOR_OR_DISPLAY_SHIFT = 0x10;
yamaguch	0:b3def1d4f466	33	#define SC 1 << 3 // select screen (DISPLAY)
yamaguch	0:b3def1d4f466	34	#define RL 1 << 2 // moving to the right
yamaguch	0:b3def1d4f466	35
yamaguch	0:b3def1d4f466	36	// Instruction Table 1 (when IS = 1)
yamaguch	0:b3def1d4f466	37	#define INTERNAL_OSC_FREQUENCY 0x10
yamaguch	0:b3def1d4f466	38	#define BS 1 << 3 // 1/4 bias
yamaguch	0:b3def1d4f466	39	#define FR_MASK 7 // adjust internal OSC freq
yamaguch	0:b3def1d4f466	40	#define SET_ICON_ADDRESS 0x40
yamaguch	0:b3def1d4f466	41	#define AC_MASK 7 // set ICON addr in address counter
yamaguch	0:b3def1d4f466	42	#define POWER_ICON_CONTRAST_CONTROL 0x50
yamaguch	0:b3def1d4f466	43	#define ION 1 << 3 // Icon On
yamaguch	0:b3def1d4f466	44	#define BON 1 << 2 // Booster On
yamaguch	0:b3def1d4f466	45	#define CONTRAST_MASK1 3 // contrast (higher bits)
yamaguch	0:b3def1d4f466	46	#define FOLLOWER_CONTROL 0x60
yamaguch	0:b3def1d4f466	47	#define FON 1 << 3 // Follower On
yamaguch	0:b3def1d4f466	48	#define RAB_MASK 7 // Rab
yamaguch	0:b3def1d4f466	49	#define CONTRAST_SET 0x70
yamaguch	0:b3def1d4f466	50	#define CONTRAST_MASK0 15 // contrast (lower bits)
yamaguch	0:b3def1d4f466	51
yamaguch	0:b3def1d4f466	52	// Set DDRAM Address
yamaguch	0:b3def1d4f466	53	#define SET_DDRAM_ADDRESS 0x80
yamaguch	0:b3def1d4f466	54
yamaguch	0:b3def1d4f466	55	Serial pc(USBTX, USBRX);
yamaguch	0:b3def1d4f466	56	LCD::LCD(PinName sdaPin, PinName sclPin, PinName resetPin, PinName backlightPin, int contrast, bool cursor, bool blink)
yamaguch	0:b3def1d4f466	57	: _reset(resetPin), backlight(backlightPin), i2c(sdaPin, sclPin), contrast(contrast), cursor(cursor), blink(blink) {
yamaguch	0:b3def1d4f466	58	resetEnabled = resetPin != NC;
yamaguch	0:b3def1d4f466	59	backlightEnabled = backlightPin != NC;
yamaguch	0:b3def1d4f466	60	reset();
yamaguch	0:b3def1d4f466	61	}
yamaguch	0:b3def1d4f466	62
yamaguch	0:b3def1d4f466	63	void LCD::reset() {
yamaguch	0:b3def1d4f466	64	wait(0.015);
yamaguch	0:b3def1d4f466	65	if (resetEnabled)
yamaguch	0:b3def1d4f466	66	_reset = 0;
yamaguch	0:b3def1d4f466	67	wait(0.01);
yamaguch	0:b3def1d4f466	68	if (resetEnabled)
yamaguch	0:b3def1d4f466	69	_reset = 1;
yamaguch	0:b3def1d4f466	70	wait(0.05);
yamaguch	0:b3def1d4f466	71
yamaguch	0:b3def1d4f466	72	writeCommand(FUNCTION_SET \| DL \| N \| (IS & 0));
yamaguch	0:b3def1d4f466	73	writeCommand(FUNCTION_SET \| DL \| N \| (IS & 1));
yamaguch	0:b3def1d4f466	74	writeCommand(INTERNAL_OSC_FREQUENCY \| BS \| (FR_MASK & 0));
yamaguch	0:b3def1d4f466	75	writeCommand(CONTRAST_SET \| (CONTRAST_MASK0 & contrast));
yamaguch	0:b3def1d4f466	76	writeCommand(POWER_ICON_CONTRAST_CONTROL \| ION \| BON \| (CONTRAST_MASK1 & contrast >> 4));
yamaguch	0:b3def1d4f466	77	//writeCommand(FOLLOWER_CONTROL \| FON \| (RAB_MASK & 2));
yamaguch	0:b3def1d4f466	78	writeCommand(FOLLOWER_CONTROL \| FON \| (RAB_MASK & 4));
yamaguch	0:b3def1d4f466	79	wait(0.3);
yamaguch	0:b3def1d4f466	80
yamaguch	0:b3def1d4f466	81	writeCommand(DISPLAY_ON_OFF_CONTROL \| DISPLAY_ON \| (cursor ? CURSOR_ON : 0) \| (blink ? CURSOR_POSITION_ON : 0));
yamaguch	0:b3def1d4f466	82	wait(0.002);
yamaguch	0:b3def1d4f466	83	cls();
yamaguch	0:b3def1d4f466	84	}
yamaguch	0:b3def1d4f466	85
yamaguch	0:b3def1d4f466	86	void LCD::display(int column, int row, int c) {
yamaguch	0:b3def1d4f466	87	writeCommand(column + 0x40 * row + 0x80);
yamaguch	0:b3def1d4f466	88	writeData(c);
yamaguch	0:b3def1d4f466	89	if (row == 1) row2[column] = c;
yamaguch	0:b3def1d4f466	90	}
yamaguch	0:b3def1d4f466	91
yamaguch	0:b3def1d4f466	92	void LCD::cls() {
yamaguch	0:b3def1d4f466	93	for (int i = 0; i < 16; i++) {
yamaguch	0:b3def1d4f466	94	writeCommand(FUNCTION_SET \| DL \| N \| (IS & 1));
yamaguch	0:b3def1d4f466	95	writeCommand(SET_ICON_ADDRESS \| i);
yamaguch	0:b3def1d4f466	96	//writeCommand(0x39);
yamaguch	0:b3def1d4f466	97	//writeCommand(0x40 + i);
yamaguch	0:b3def1d4f466	98	writeData(0);
yamaguch	0:b3def1d4f466	99	}
yamaguch	0:b3def1d4f466	100
yamaguch	0:b3def1d4f466	101	writeCommand(CLEAR_DISPLAY);
yamaguch	0:b3def1d4f466	102	wait(0.00164f);
yamaguch	0:b3def1d4f466	103	locate(0, 0);
yamaguch	0:b3def1d4f466	104	}
yamaguch	0:b3def1d4f466	105
yamaguch	0:b3def1d4f466	106	void LCD::locate(int column, int row) {
yamaguch	0:b3def1d4f466	107	this->column = column;
yamaguch	0:b3def1d4f466	108	this->row = row;
yamaguch	0:b3def1d4f466	109	}
yamaguch	0:b3def1d4f466	110
yamaguch	0:b3def1d4f466	111	int LCD::_putc(int value) {
yamaguch	0:b3def1d4f466	112	if (row >= ROWS) {
yamaguch	0:b3def1d4f466	113	scrollDown();
yamaguch	0:b3def1d4f466	114	row = 1;
yamaguch	0:b3def1d4f466	115	}
yamaguch	0:b3def1d4f466	116	if (value == '\n')
yamaguch	0:b3def1d4f466	117	column = COLUMNS;
yamaguch	0:b3def1d4f466	118	else
yamaguch	0:b3def1d4f466	119	display(column, row, value);
yamaguch	0:b3def1d4f466	120
yamaguch	0:b3def1d4f466	121	if (++column >= COLUMNS) {
yamaguch	0:b3def1d4f466	122	column = 0;
yamaguch	0:b3def1d4f466	123	row++;
yamaguch	0:b3def1d4f466	124	}
yamaguch	0:b3def1d4f466	125
yamaguch	0:b3def1d4f466	126	return value;
yamaguch	0:b3def1d4f466	127	}
yamaguch	0:b3def1d4f466	128
yamaguch	0:b3def1d4f466	129	int LCD::_getc() {
yamaguch	0:b3def1d4f466	130	return -1;
yamaguch	0:b3def1d4f466	131	}
yamaguch	0:b3def1d4f466	132
yamaguch	0:b3def1d4f466	133	void LCD::scrollDown() {
yamaguch	0:b3def1d4f466	134	writeCommand(SET_DDRAM_ADDRESS \| 0x00);
yamaguch	0:b3def1d4f466	135	writeData(row2, sizeof(row2));
yamaguch	0:b3def1d4f466	136	memset(row2, ' ', sizeof(row2));
yamaguch	0:b3def1d4f466	137	writeCommand(SET_DDRAM_ADDRESS \| 0x40);
yamaguch	0:b3def1d4f466	138	writeData(row2, sizeof(row2));
yamaguch	0:b3def1d4f466	139	}
yamaguch	0:b3def1d4f466	140
yamaguch	0:b3def1d4f466	141	void LCD::writeCommand(int command) {
yamaguch	0:b3def1d4f466	142	char buf[] = {COMMAND, command};
yamaguch	0:b3def1d4f466	143	i2c.write(I2C_ADDR, buf, sizeof(buf));
yamaguch	0:b3def1d4f466	144	}
yamaguch	0:b3def1d4f466	145
yamaguch	0:b3def1d4f466	146	void LCD::writeData(int data) {
yamaguch	0:b3def1d4f466	147	char buf[] = {DATA, data};
yamaguch	0:b3def1d4f466	148	i2c.write(I2C_ADDR, buf, sizeof(buf));
yamaguch	0:b3def1d4f466	149	}
yamaguch	0:b3def1d4f466	150
yamaguch	0:b3def1d4f466	151	void LCD::writeData(char data[], int length) {
yamaguch	0:b3def1d4f466	152	char buf[length + 1];
yamaguch	0:b3def1d4f466	153	buf[0] = DATA;
yamaguch	0:b3def1d4f466	154	memcpy(&buf[1], data, length);
yamaguch	0:b3def1d4f466	155	i2c.write(I2C_ADDR, buf, sizeof(buf));
yamaguch	0:b3def1d4f466	156	}
yamaguch	0:b3def1d4f466	157
yamaguch	0:b3def1d4f466	158	void LCD::showIcon(Icon icon) {
yamaguch	0:b3def1d4f466	159	switch (icon) {
yamaguch	0:b3def1d4f466	160	case ALL:
yamaguch	0:b3def1d4f466	161	for (int i = 0; i < 16; i++) {
yamaguch	0:b3def1d4f466	162	writeCommand(FUNCTION_SET \| DL \| N \| (IS & 1));
yamaguch	0:b3def1d4f466	163	writeCommand(SET_ICON_ADDRESS \| i);
yamaguch	0:b3def1d4f466	164	writeData(0x1F);
yamaguch	0:b3def1d4f466	165	}
yamaguch	0:b3def1d4f466	166	break;
yamaguch	0:b3def1d4f466	167	default:
yamaguch	0:b3def1d4f466	168	writeCommand(FUNCTION_SET \| DL \| N \| (IS & 1));
yamaguch	0:b3def1d4f466	169	writeCommand(SET_ICON_ADDRESS \| (icon >> 8));
yamaguch	0:b3def1d4f466	170	writeData(icon & 0xFF);
yamaguch	0:b3def1d4f466	171	}
yamaguch	0:b3def1d4f466	172	}
yamaguch	0:b3def1d4f466	173
yamaguch	0:b3def1d4f466	174	void LCD::hideIcon(Icon icon) {
yamaguch	0:b3def1d4f466	175	switch (icon) {
yamaguch	0:b3def1d4f466	176	case ALL:
yamaguch	0:b3def1d4f466	177	for (int i = 0; i < 16; i++) {
yamaguch	0:b3def1d4f466	178	writeCommand(FUNCTION_SET \| DL \| N \| (IS & 1));
yamaguch	0:b3def1d4f466	179	writeCommand(SET_ICON_ADDRESS \| i);
yamaguch	0:b3def1d4f466	180	writeData(0);
yamaguch	0:b3def1d4f466	181	}
yamaguch	0:b3def1d4f466	182	break;
yamaguch	0:b3def1d4f466	183	default:
yamaguch	0:b3def1d4f466	184	writeCommand(FUNCTION_SET \| DL \| N \| (IS & 1));
yamaguch	0:b3def1d4f466	185	writeCommand(SET_ICON_ADDRESS \| (icon >> 8));
yamaguch	0:b3def1d4f466	186	writeData(0);
yamaguch	0:b3def1d4f466	187	}
yamaguch	0:b3def1d4f466	188	}
yamaguch	0:b3def1d4f466	189
yamaguch	0:b3def1d4f466	190	void LCD::setBacklight(bool on) {
yamaguch	0:b3def1d4f466	191	if (backlightEnabled)
yamaguch	0:b3def1d4f466	192	backlight = on;
yamaguch	0:b3def1d4f466	193	}

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Type:	Library
Created:	22 Dec 2011
Imports:	225
Forks:	1
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	13

LCD.cpp@0:b3def1d4f466, 2011-12-22 (annotated)

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