/* | |
* Copyright 2009-2011 Oleg Mazurov, Circuits At Home, http://www.circuitsathome.com | |
* MAX3421E USB host controller support | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* 3. Neither the name of the authors nor the names of its contributors | |
* may be used to endorse or promote products derived from this software | |
* without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
* SUCH DAMAGE. | |
*/ | |
//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); | |
} |