From 00c82352e5ab7d64eab2f795a9609ac0968d05a8 Mon Sep 17 00:00:00 2001 From: unknown Date: Sun, 17 Apr 2011 21:39:24 -0600 Subject: [PATCH] LCD support added --- max_LCD.cpp | 247 ++++++++++++++++++++++++++++++++++++++++++++++++++++ max_LCD.h | 91 +++++++++++++++++++ 2 files changed, 338 insertions(+) create mode 100644 max_LCD.cpp create mode 100644 max_LCD.h diff --git a/max_LCD.cpp b/max_LCD.cpp new file mode 100644 index 00000000..2b84db0c --- /dev/null +++ b/max_LCD.cpp @@ -0,0 +1,247 @@ +#include "Max_LCD.h" +#include "Max3421e.h" + +#include +#include +#include +#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 its 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() pUsb->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(USB *pusb) : pUsb(pusb) +{ + 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); +} diff --git a/max_LCD.h b/max_LCD.h new file mode 100644 index 00000000..e746b6d3 --- /dev/null +++ b/max_LCD.h @@ -0,0 +1,91 @@ +//HD44780 compatible LCD display via MAX3421E GPOUT support header +//pinout: D[4-7] -> GPOUT[4-7], RS-> GPOUT[2], E ->GPOUT[3] +// +//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.h +// +#ifndef _Max_LCD_h_ +#define _Max_LCD_h_ + +#include +#include "Print.h" +#include "Usb.h" + +// commands +#define LCD_CLEARDISPLAY 0x01 +#define LCD_RETURNHOME 0x02 +#define LCD_ENTRYMODESET 0x04 +#define LCD_DISPLAYCONTROL 0x08 +#define LCD_CURSORSHIFT 0x10 +#define LCD_FUNCTIONSET 0x20 +#define LCD_SETCGRAMADDR 0x40 +#define LCD_SETDDRAMADDR 0x80 + +// flags for display entry mode +#define LCD_ENTRYRIGHT 0x00 +#define LCD_ENTRYLEFT 0x02 +#define LCD_ENTRYSHIFTINCREMENT 0x01 +#define LCD_ENTRYSHIFTDECREMENT 0x00 + +// flags for display on/off control +#define LCD_DISPLAYON 0x04 +#define LCD_DISPLAYOFF 0x00 +#define LCD_CURSORON 0x02 +#define LCD_CURSOROFF 0x00 +#define LCD_BLINKON 0x01 +#define LCD_BLINKOFF 0x00 + +// flags for display/cursor shift +#define LCD_DISPLAYMOVE 0x08 +#define LCD_CURSORMOVE 0x00 +#define LCD_MOVERIGHT 0x04 +#define LCD_MOVELEFT 0x00 + +// flags for function set +#define LCD_8BITMODE 0x10 +#define LCD_4BITMODE 0x00 +#define LCD_2LINE 0x08 +#define LCD_1LINE 0x00 +#define LCD_5x10DOTS 0x04 +#define LCD_5x8DOTS 0x00 + +class Max_LCD : public Print +{ + USB *pUsb; + +public: + Max_LCD(USB *pusb); + void init(); + void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS); + void clear(); + void home(); + void noDisplay(); + void display(); + void noBlink(); + void blink(); + void noCursor(); + void cursor(); + void scrollDisplayLeft(); + void scrollDisplayRight(); + void leftToRight(); + void rightToLeft(); + void autoscroll(); + void noAutoscroll(); + void createChar(uint8_t, uint8_t[]); + void setCursor(uint8_t, uint8_t); + virtual void write(uint8_t); + void command(uint8_t); + +private: + void sendbyte( uint8_t val ); + uint8_t _displayfunction; //tokill + uint8_t _displaycontrol; + uint8_t _displaymode; + uint8_t _initialized; + uint8_t _numlines,_currline; +}; + + + + +#endif \ No newline at end of file