| /* |
| * 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 "Arduino.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 size_t 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); |
| } |