Merge remote branch 'leaf/master'

1 files changed, 324 insertions, 0 deletions

diff --git a/libraries/LiquidCrystal/LiquidCrystal.cpp b/libraries/LiquidCrystal/LiquidCrystal.cpp
new file mode 100644
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+++ b/libraries/LiquidCrystal/LiquidCrystal.cpp
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+#include "LiquidCrystal.h"
+
+#include <stdio.h>
+#include <string.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 its in that state when a sketch starts (and the
+// LiquidCrystal constructor is called).
+
+// This library has been modified to be compatible with the LeafLabs Maple;
+// very conservative timing is used due to problems with delayMicroseconds()
+// that should be fixed in the 0.0.7 release of the libmaple. [bnewbold]
+
+LiquidCrystal::LiquidCrystal(uint8 rs, uint8 rw, uint8 enable,
+                             uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+                             uint8 d4, uint8 d5, uint8 d6, uint8 d7)
+{
+  init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
+}
+
+LiquidCrystal::LiquidCrystal(uint8 rs, uint8 enable,
+                             uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+                             uint8 d4, uint8 d5, uint8 d6, uint8 d7)
+{
+  init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
+}
+
+LiquidCrystal::LiquidCrystal(uint8 rs, uint8 rw, uint8 enable,
+                             uint8 d0, uint8 d1, uint8 d2, uint8 d3)
+{
+  init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
+}
+
+LiquidCrystal::LiquidCrystal(uint8 rs,  uint8 enable,
+                             uint8 d0, uint8 d1, uint8 d2, uint8 d3)
+{
+  init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
+}
+
+void LiquidCrystal::init(uint8 fourbitmode, uint8 rs, uint8 rw, uint8 enable,
+                         uint8 d0, uint8 d1, uint8 d2, uint8 d3,
+                         uint8 d4, uint8 d5, uint8 d6, uint8 d7)
+{
+  _rs_pin = rs;
+  _rw_pin = rw;
+  _enable_pin = enable;
+
+  _data_pins[0] = d0;
+  _data_pins[1] = d1;
+  _data_pins[2] = d2;
+  _data_pins[3] = d3;
+  _data_pins[4] = d4;
+  _data_pins[5] = d5;
+  _data_pins[6] = d6;
+  _data_pins[7] = d7;
+
+  pinMode(_rs_pin, OUTPUT);
+  // we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
+  if (_rw_pin != 255) {
+    pinMode(_rw_pin, OUTPUT);
+  }
+  pinMode(_enable_pin, OUTPUT);
+
+  if (fourbitmode)
+    _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
+  else
+    _displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
+
+  // TODO: bnewbold, re-enable this?
+  begin(16, 1);
+}
+
+void LiquidCrystal::begin(uint8 cols, uint8 lines, uint8 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
+  delay(50);    // Maple mod
+  //delayMicroseconds(50000);
+  // Now we pull both RS and R/W low to begin commands
+  digitalWrite(_rs_pin, LOW);
+  digitalWrite(_enable_pin, LOW);
+  if (_rw_pin != 255) {
+    digitalWrite(_rw_pin, LOW);
+  }
+
+  //put the LCD into 4 bit or 8 bit mode
+  if (! (_displayfunction & LCD_8BITMODE)) {
+    // this is according to the hitachi HD44780 datasheet
+    // figure 24, pg 46
+
+    // we start in 8bit mode, try to set 4 bit mode
+    write4bits(0x03);
+    delay(5);   // Maple mod
+    //delayMicroseconds(4500); // wait min 4.1ms
+
+    // second try
+    write4bits(0x03);
+    delay(5);   // Maple mod
+    //delayMicroseconds(4500); // wait min 4.1ms
+
+    // third go!
+    write4bits(0x03);
+    delay(1);   // Maple mod
+    //delayMicroseconds(150);
+
+    // finally, set to 8-bit interface
+    write4bits(0x02);
+  } else {
+    // this is according to the hitachi HD44780 datasheet
+    // page 45 figure 23
+
+    // Send function set command sequence
+    command(LCD_FUNCTIONSET | _displayfunction);
+    delay(5);   // Maple mod
+    //delayMicroseconds(4500);  // wait more than 4.1ms
+
+    // second try
+    command(LCD_FUNCTIONSET | _displayfunction);
+    delay(1);   // Maple mod
+    //delayMicroseconds(150);
+
+    // third go
+    command(LCD_FUNCTIONSET | _displayfunction);
+  }
+
+  // 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 LiquidCrystal::clear()
+{
+  command(LCD_CLEARDISPLAY);  // clear display, set cursor position to zero
+  delay(2);     // Maple mod
+  //delayMicroseconds(2000);  // this command takes a long time!
+}
+
+void LiquidCrystal::home()
+{
+  command(LCD_RETURNHOME);  // set cursor position to zero
+  delay(2);     // Maple mod
+  //delayMicroseconds(2000);  // this command takes a long time!
+}
+
+void LiquidCrystal::setCursor(uint8 col, uint8 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 LiquidCrystal::noDisplay() {
+  _displaycontrol &= ~LCD_DISPLAYON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::display() {
+  _displaycontrol |= LCD_DISPLAYON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// Turns the underline cursor on/off
+void LiquidCrystal::noCursor() {
+  _displaycontrol &= ~LCD_CURSORON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::cursor() {
+  _displaycontrol |= LCD_CURSORON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// Turn on and off the blinking cursor
+void LiquidCrystal::noBlink() {
+  _displaycontrol &= ~LCD_BLINKON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal::blink() {
+  _displaycontrol |= LCD_BLINKON;
+  command(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// These commands scroll the display without changing the RAM
+void LiquidCrystal::scrollDisplayLeft(void) {
+  command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
+}
+void LiquidCrystal::scrollDisplayRight(void) {
+  command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
+}
+
+// This is for text that flows Left to Right
+void LiquidCrystal::leftToRight(void) {
+  _displaymode |= LCD_ENTRYLEFT;
+  command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This is for text that flows Right to Left
+void LiquidCrystal::rightToLeft(void) {
+  _displaymode &= ~LCD_ENTRYLEFT;
+  command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This will 'right justify' text from the cursor
+void LiquidCrystal::autoscroll(void) {
+  _displaymode |= LCD_ENTRYSHIFTINCREMENT;
+  command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This will 'left justify' text from the cursor
+void LiquidCrystal::noAutoscroll(void) {
+  _displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
+  command(LCD_ENTRYMODESET | _displaymode);
+}
+
+// Allows us to fill the first 8 CGRAM locations
+// with custom characters
+void LiquidCrystal::createChar(uint8 location, uint8 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 LiquidCrystal::command(uint8 value) {
+  send(value, LOW);
+}
+
+inline void LiquidCrystal::write(uint8 value) {
+  send(value, HIGH);
+}
+
+/************ low level data pushing commands **********/
+
+// write either command or data, with automatic 4/8-bit selection
+void LiquidCrystal::send(uint8 value, uint8 mode) {
+  digitalWrite(_rs_pin, mode);
+
+  // if there is a RW pin indicated, set it low to Write
+  if (_rw_pin != 255) {
+    digitalWrite(_rw_pin, LOW);
+  }
+
+  if (_displayfunction & LCD_8BITMODE) {
+    write8bits(value);
+  } else {
+    write4bits(value>>4);
+    write4bits(value);
+  }
+}
+
+void LiquidCrystal::pulseEnable(void) {
+  digitalWrite(_enable_pin, LOW);
+  delay(1);     // Maple mod
+  //delayMicroseconds(1);
+  digitalWrite(_enable_pin, HIGH);
+  delay(1);     // Maple mod
+  //delayMicroseconds(1);    // enable pulse must be >450ns
+  digitalWrite(_enable_pin, LOW);
+  delay(1);     // Maple mod
+  //delayMicroseconds(100);   // commands need > 37us to settle
+}
+
+void LiquidCrystal::write4bits(uint8 value) {
+  for (int i = 0; i < 4; i++) {
+    pinMode(_data_pins[i], OUTPUT);
+    digitalWrite(_data_pins[i], (value >> i) & 0x01);
+  }
+
+  pulseEnable();
+}
+
+void LiquidCrystal::write8bits(uint8 value) {
+  for (int i = 0; i < 8; i++) {
+    pinMode(_data_pins[i], OUTPUT);
+    digitalWrite(_data_pins[i], (value >> i) & 0x01);
+  }
+
+  pulseEnable();
+}