LCD support added

max_LCD.cpp

@@ -0,0 +1,247 @@
+#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 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);
+}

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 <inttypes.h>
+#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