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/* Copyright 2009-2011 Oleg Mazurov, Circuits At Home, http://www.circuitsathome.com */
//this code is heavily borrowed from official Arduino source v.0017
// link to original http://code.google.com/p/arduino/source/browse/trunk/hardware/libraries/LiquidCrystal/LiquidCrystal.cpp
#include "Max_LCD.h"
#include "Max3421e.h"
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "WProgram.h"
// When the display powers up, it is configured as follows:
//
// 1. Display clear
// 2. Function set:
// DL = 1; 8-bit interface data
// N = 0; 1-line display
// F = 0; 5x8 dot character font
// 3. Display on/off control:
// D = 0; Display off
// C = 0; Cursor off
// B = 0; Blinking off
// 4. Entry mode set:
// I/D = 1; Increment by 1
// S = 0; No shift
//
// Note, however, that resetting the Arduino doesn't reset the LCD, so we
// can't assume that it's in that state when a sketch starts
// pin definition and set/clear
#define RS 0x04 // RS pin
#define E 0x08 // E pin
#define SET_RS lcdPins |= RS
#define CLR_RS lcdPins &= ~RS
#define SET_E lcdPins |= E
#define CLR_E lcdPins &= ~E
#define SENDlcdPins() MAX3421E::gpioWr( lcdPins )
#define LCD_sendcmd(a) { CLR_RS; \
sendbyte(a); \
}
#define LCD_sendchar(a) { SET_RS; \
sendbyte(a); \
}
static byte lcdPins; //copy of LCD pins
Max_LCD::Max_LCD()
{
lcdPins = 0;
}
void Max_LCD::init()
{
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
// MAX3421E::gpioWr(0x55);
begin(16, 1);
}
void Max_LCD::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
if (lines > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = lines;
_currline = 0;
// for some 1 line displays you can select a 10 pixel high font
if ((dotsize != 0) && (lines == 1)) {
_displayfunction |= LCD_5x10DOTS;
}
// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
// according to datasheet, we need at least 40ms after power rises above 2.7V
// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
delayMicroseconds(50000);
lcdPins = 0x30;
SET_E;
SENDlcdPins();
CLR_E;
SENDlcdPins();
delayMicroseconds(10000); // wait min 4.1ms
//second try
SET_E;
SENDlcdPins();
CLR_E;
SENDlcdPins();
delayMicroseconds(10000); // wait min 4.1ms
// third go!
SET_E;
SENDlcdPins();
CLR_E;
SENDlcdPins();
delayMicroseconds(10000);
// finally, set to 4-bit interface
lcdPins = 0x20;
//SET_RS;
SET_E;
SENDlcdPins();
//CLR_RS;
CLR_E;
SENDlcdPins();
delayMicroseconds(10000);
// finally, set # lines, font size, etc.
command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
display();
// clear it off
clear();
// Initialize to default text direction (for romance languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
command(LCD_ENTRYMODESET | _displaymode);
}
/********** high level commands, for the user! */
void Max_LCD::clear()
{
command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void Max_LCD::home()
{
command(LCD_RETURNHOME); // set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void Max_LCD::setCursor(uint8_t col, uint8_t row)
{
int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
if ( row > _numlines ) {
row = _numlines-1; // we count rows starting w/0
}
command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
}
// Turn the display on/off (quickly)
void Max_LCD::noDisplay() {
_displaycontrol &= ~LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void Max_LCD::display() {
_displaycontrol |= LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turns the underline cursor on/off
void Max_LCD::noCursor() {
_displaycontrol &= ~LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void Max_LCD::cursor() {
_displaycontrol |= LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turn on and off the blinking cursor
void Max_LCD::noBlink() {
_displaycontrol &= ~LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void Max_LCD::blink() {
_displaycontrol |= LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// These commands scroll the display without changing the RAM
void Max_LCD::scrollDisplayLeft(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
}
void Max_LCD::scrollDisplayRight(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
}
// This is for text that flows Left to Right
void Max_LCD::leftToRight(void) {
_displaymode |= LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This is for text that flows Right to Left
void Max_LCD::rightToLeft(void) {
_displaymode &= ~LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'right justify' text from the cursor
void Max_LCD::autoscroll(void) {
_displaymode |= LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'left justify' text from the cursor
void Max_LCD::noAutoscroll(void) {
_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// Allows us to fill the first 8 CGRAM locations
// with custom characters
void Max_LCD::createChar(uint8_t location, uint8_t charmap[]) {
location &= 0x7; // we only have 8 locations 0-7
command(LCD_SETCGRAMADDR | (location << 3));
for (int i=0; i<8; i++) {
write(charmap[i]);
}
}
/*********** mid level commands, for sending data/cmds */
inline void Max_LCD::command(uint8_t value) {
LCD_sendcmd(value);
delayMicroseconds(100);
}
inline void Max_LCD::write(uint8_t value) {
LCD_sendchar(value);
}
void Max_LCD::sendbyte( uint8_t val )
{
lcdPins &= 0x0f; //prepare place for the upper nibble
lcdPins |= ( val & 0xf0 ); //copy upper nibble to LCD variable
SET_E; //send
SENDlcdPins();
delayMicroseconds(2);
CLR_E;
delayMicroseconds(2);
SENDlcdPins();
lcdPins &= 0x0f; //prepare place for the lower nibble
lcdPins |= ( val << 4 ) & 0xf0; //copy lower nibble to LCD variable
SET_E; //send
SENDlcdPins();
CLR_E;
SENDlcdPins();
delayMicroseconds(100);
}