256 lines
6.9 KiB
C++
256 lines
6.9 KiB
C++
/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
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This software may be distributed and modified under the terms of the GNU
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General Public License version 2 (GPL2) as published by the Free Software
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Foundation and appearing in the file GPL2.TXT included in the packaging of
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this file. Please note that GPL2 Section 2[b] requires that all works based
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on this software must also be made publicly available under the terms of
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the GPL2 ("Copyleft").
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Contact information
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-------------------
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Circuits At Home, LTD
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Web : http://www.circuitsathome.com
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e-mail : support@circuitsathome.com
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*/
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#include "max_LCD.h"
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#include <string.h>
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// pin definition and set/clear
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#define RS 0x04 // RS pin
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#define E 0x08 // E pin
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#define SET_RS lcdPins |= RS
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#define CLR_RS lcdPins &= ~RS
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#define SET_E lcdPins |= E
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#define CLR_E lcdPins &= ~E
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#define SENDlcdPins() pUsb->gpioWr( lcdPins )
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#define LCD_sendcmd(a) { CLR_RS; \
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sendbyte(a); \
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}
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#define LCD_sendchar(a) { SET_RS; \
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sendbyte(a); \
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}
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static byte lcdPins; //copy of LCD pins
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Max_LCD::Max_LCD(USB *pusb) : pUsb(pusb) {
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lcdPins = 0;
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}
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void Max_LCD::init() {
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_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
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// MAX3421E::gpioWr(0x55);
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begin(16, 1);
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}
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void Max_LCD::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
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if(lines > 1) {
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_displayfunction |= LCD_2LINE;
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}
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_numlines = lines;
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_currline = 0;
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// for some 1 line displays you can select a 10 pixel high font
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if((dotsize != 0) && (lines == 1)) {
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_displayfunction |= LCD_5x10DOTS;
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}
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// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
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// according to datasheet, we need at least 40ms after power rises above 2.7V
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// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
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delayMicroseconds(50000);
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lcdPins = 0x30;
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SET_E;
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SENDlcdPins();
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(10000); // wait min 4.1ms
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//second try
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SET_E;
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SENDlcdPins();
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(10000); // wait min 4.1ms
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// third go!
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SET_E;
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SENDlcdPins();
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(10000);
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// finally, set to 4-bit interface
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lcdPins = 0x20;
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//SET_RS;
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SET_E;
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SENDlcdPins();
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//CLR_RS;
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(10000);
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// finally, set # lines, font size, etc.
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command(LCD_FUNCTIONSET | _displayfunction);
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// turn the display on with no cursor or blinking default
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_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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display();
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// clear it off
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clear();
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// Initialize to default text direction (for romance languages)
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_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
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// set the entry mode
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command(LCD_ENTRYMODESET | _displaymode);
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}
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/********** high level commands, for the user! */
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void Max_LCD::clear() {
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command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void Max_LCD::home() {
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command(LCD_RETURNHOME); // set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void Max_LCD::setCursor(uint8_t col, uint8_t row) {
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int row_offsets[] = {0x00, 0x40, 0x14, 0x54};
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if(row > _numlines) {
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row = _numlines - 1; // we count rows starting w/0
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}
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command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
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}
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// Turn the display on/off (quickly)
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void Max_LCD::noDisplay() {
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_displaycontrol &= ~LCD_DISPLAYON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void Max_LCD::display() {
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_displaycontrol |= LCD_DISPLAYON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// Turns the underline cursor on/off
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void Max_LCD::noCursor() {
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_displaycontrol &= ~LCD_CURSORON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void Max_LCD::cursor() {
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_displaycontrol |= LCD_CURSORON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// Turn on and off the blinking cursor
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void Max_LCD::noBlink() {
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_displaycontrol &= ~LCD_BLINKON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void Max_LCD::blink() {
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_displaycontrol |= LCD_BLINKON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// These commands scroll the display without changing the RAM
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void Max_LCD::scrollDisplayLeft(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
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}
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void Max_LCD::scrollDisplayRight(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
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}
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// This is for text that flows Left to Right
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void Max_LCD::leftToRight(void) {
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_displaymode |= LCD_ENTRYLEFT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This is for text that flows Right to Left
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void Max_LCD::rightToLeft(void) {
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_displaymode &= ~LCD_ENTRYLEFT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This will 'right justify' text from the cursor
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void Max_LCD::autoscroll(void) {
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_displaymode |= LCD_ENTRYSHIFTINCREMENT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This will 'left justify' text from the cursor
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void Max_LCD::noAutoscroll(void) {
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_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// Allows us to fill the first 8 CGRAM locations
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// with custom characters
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void Max_LCD::createChar(uint8_t location, uint8_t charmap[]) {
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location &= 0x7; // we only have 8 locations 0-7
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command(LCD_SETCGRAMADDR | (location << 3));
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for(int i = 0; i < 8; i++) {
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write(charmap[i]);
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}
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}
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/*********** mid level commands, for sending data/cmds */
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inline void Max_LCD::command(uint8_t value) {
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LCD_sendcmd(value);
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delayMicroseconds(100);
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}
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#if defined(ARDUINO) && ARDUINO >=100
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inline size_t Max_LCD::write(uint8_t value) {
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LCD_sendchar(value);
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return 1; // Assume success
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}
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#else
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inline void Max_LCD::write(uint8_t value) {
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LCD_sendchar(value);
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}
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#endif
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void Max_LCD::sendbyte(uint8_t val) {
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lcdPins &= 0x0f; //prepare place for the upper nibble
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lcdPins |= (val & 0xf0); //copy upper nibble to LCD variable
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SET_E; //send
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SENDlcdPins();
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delayMicroseconds(2);
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CLR_E;
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delayMicroseconds(2);
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SENDlcdPins();
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lcdPins &= 0x0f; //prepare place for the lower nibble
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lcdPins |= (val << 4) & 0xf0; //copy lower nibble to LCD variable
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SET_E; //send
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SENDlcdPins();
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(100);
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}
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