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https://github.com/felis/USB_Host_Shield_2.0.git
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LCD support added
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247
max_LCD.cpp
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247
max_LCD.cpp
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#include "Max_LCD.h"
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#include "Max3421e.h"
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include "WProgram.h"
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// When the display powers up, it is configured as follows:
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//
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// 1. Display clear
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// 2. Function set:
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// DL = 1; 8-bit interface data
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// N = 0; 1-line display
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// F = 0; 5x8 dot character font
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// 3. Display on/off control:
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// D = 0; Display off
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// C = 0; Cursor off
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// B = 0; Blinking off
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// 4. Entry mode set:
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// I/D = 1; Increment by 1
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// S = 0; No shift
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//
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// Note, however, that resetting the Arduino doesn't reset the LCD, so we
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// can't assume that its in that state when a sketch starts
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// pin definition and set/clear
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#define RS 0x04 // RS pin
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#define E 0x08 // E pin
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#define SET_RS lcdPins |= RS
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#define CLR_RS lcdPins &= ~RS
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#define SET_E lcdPins |= E
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#define CLR_E lcdPins &= ~E
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#define SENDlcdPins() pUsb->gpioWr( lcdPins )
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#define LCD_sendcmd(a) { CLR_RS; \
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sendbyte(a); \
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}
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#define LCD_sendchar(a) { SET_RS; \
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sendbyte(a); \
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}
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static byte lcdPins; //copy of LCD pins
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Max_LCD::Max_LCD(USB *pusb) : pUsb(pusb)
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{
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lcdPins = 0;
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}
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void Max_LCD::init()
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{
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_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
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// MAX3421E::gpioWr(0x55);
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begin(16, 1);
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}
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void Max_LCD::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
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if (lines > 1) {
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_displayfunction |= LCD_2LINE;
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}
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_numlines = lines;
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_currline = 0;
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// for some 1 line displays you can select a 10 pixel high font
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if ((dotsize != 0) && (lines == 1)) {
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_displayfunction |= LCD_5x10DOTS;
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}
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// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
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// according to datasheet, we need at least 40ms after power rises above 2.7V
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// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
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delayMicroseconds(50000);
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lcdPins = 0x30;
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SET_E;
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SENDlcdPins();
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(10000); // wait min 4.1ms
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//second try
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SET_E;
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SENDlcdPins();
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(10000); // wait min 4.1ms
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// third go!
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SET_E;
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SENDlcdPins();
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(10000);
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// finally, set to 4-bit interface
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lcdPins = 0x20;
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//SET_RS;
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SET_E;
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SENDlcdPins();
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//CLR_RS;
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(10000);
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// finally, set # lines, font size, etc.
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command(LCD_FUNCTIONSET | _displayfunction);
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// turn the display on with no cursor or blinking default
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_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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display();
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// clear it off
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clear();
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// Initialize to default text direction (for romance languages)
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_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
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// set the entry mode
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command(LCD_ENTRYMODESET | _displaymode);
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}
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/********** high level commands, for the user! */
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void Max_LCD::clear()
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{
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command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void Max_LCD::home()
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{
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command(LCD_RETURNHOME); // set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void Max_LCD::setCursor(uint8_t col, uint8_t row)
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{
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int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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if ( row > _numlines ) {
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row = _numlines-1; // we count rows starting w/0
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}
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command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
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}
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// Turn the display on/off (quickly)
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void Max_LCD::noDisplay() {
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_displaycontrol &= ~LCD_DISPLAYON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void Max_LCD::display() {
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_displaycontrol |= LCD_DISPLAYON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// Turns the underline cursor on/off
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void Max_LCD::noCursor() {
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_displaycontrol &= ~LCD_CURSORON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void Max_LCD::cursor() {
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_displaycontrol |= LCD_CURSORON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// Turn on and off the blinking cursor
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void Max_LCD::noBlink() {
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_displaycontrol &= ~LCD_BLINKON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void Max_LCD::blink() {
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_displaycontrol |= LCD_BLINKON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// These commands scroll the display without changing the RAM
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void Max_LCD::scrollDisplayLeft(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
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}
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void Max_LCD::scrollDisplayRight(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
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}
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// This is for text that flows Left to Right
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void Max_LCD::leftToRight(void) {
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_displaymode |= LCD_ENTRYLEFT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This is for text that flows Right to Left
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void Max_LCD::rightToLeft(void) {
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_displaymode &= ~LCD_ENTRYLEFT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This will 'right justify' text from the cursor
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void Max_LCD::autoscroll(void) {
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_displaymode |= LCD_ENTRYSHIFTINCREMENT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This will 'left justify' text from the cursor
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void Max_LCD::noAutoscroll(void) {
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_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// Allows us to fill the first 8 CGRAM locations
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// with custom characters
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void Max_LCD::createChar(uint8_t location, uint8_t charmap[]) {
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location &= 0x7; // we only have 8 locations 0-7
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command(LCD_SETCGRAMADDR | (location << 3));
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for (int i=0; i<8; i++) {
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write(charmap[i]);
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}
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}
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/*********** mid level commands, for sending data/cmds */
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inline void Max_LCD::command(uint8_t value) {
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LCD_sendcmd(value);
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delayMicroseconds(100);
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}
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inline void Max_LCD::write(uint8_t value) {
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LCD_sendchar(value);
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}
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void Max_LCD::sendbyte( uint8_t val )
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{
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lcdPins &= 0x0f; //prepare place for the upper nibble
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lcdPins |= ( val & 0xf0 ); //copy upper nibble to LCD variable
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SET_E; //send
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SENDlcdPins();
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delayMicroseconds(2);
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CLR_E;
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delayMicroseconds(2);
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SENDlcdPins();
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lcdPins &= 0x0f; //prepare place for the lower nibble
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lcdPins |= ( val << 4 ) & 0xf0; //copy lower nibble to LCD variable
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SET_E; //send
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SENDlcdPins();
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CLR_E;
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SENDlcdPins();
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delayMicroseconds(100);
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}
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91
max_LCD.h
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91
max_LCD.h
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//HD44780 compatible LCD display via MAX3421E GPOUT support header
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//pinout: D[4-7] -> GPOUT[4-7], RS-> GPOUT[2], E ->GPOUT[3]
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//
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//this code is heavily borrowed from official Arduino source v.0017
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// link to original http://code.google.com/p/arduino/source/browse/trunk/hardware/libraries/LiquidCrystal/LiquidCrystal.h
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//
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#ifndef _Max_LCD_h_
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#define _Max_LCD_h_
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#include <inttypes.h>
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#include "Print.h"
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#include "Usb.h"
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// commands
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#define LCD_CLEARDISPLAY 0x01
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#define LCD_RETURNHOME 0x02
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#define LCD_ENTRYMODESET 0x04
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#define LCD_DISPLAYCONTROL 0x08
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#define LCD_CURSORSHIFT 0x10
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#define LCD_FUNCTIONSET 0x20
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#define LCD_SETCGRAMADDR 0x40
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#define LCD_SETDDRAMADDR 0x80
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// flags for display entry mode
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#define LCD_ENTRYRIGHT 0x00
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#define LCD_ENTRYLEFT 0x02
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#define LCD_ENTRYSHIFTINCREMENT 0x01
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#define LCD_ENTRYSHIFTDECREMENT 0x00
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// flags for display on/off control
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#define LCD_DISPLAYON 0x04
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#define LCD_DISPLAYOFF 0x00
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#define LCD_CURSORON 0x02
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#define LCD_CURSOROFF 0x00
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#define LCD_BLINKON 0x01
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#define LCD_BLINKOFF 0x00
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// flags for display/cursor shift
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#define LCD_DISPLAYMOVE 0x08
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#define LCD_CURSORMOVE 0x00
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#define LCD_MOVERIGHT 0x04
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#define LCD_MOVELEFT 0x00
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// flags for function set
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#define LCD_8BITMODE 0x10
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#define LCD_4BITMODE 0x00
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#define LCD_2LINE 0x08
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#define LCD_1LINE 0x00
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#define LCD_5x10DOTS 0x04
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#define LCD_5x8DOTS 0x00
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class Max_LCD : public Print
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{
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USB *pUsb;
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public:
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Max_LCD(USB *pusb);
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void init();
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void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
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void clear();
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void home();
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void noDisplay();
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void display();
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void noBlink();
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void blink();
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void noCursor();
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void cursor();
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void scrollDisplayLeft();
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void scrollDisplayRight();
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void leftToRight();
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void rightToLeft();
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void autoscroll();
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void noAutoscroll();
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void createChar(uint8_t, uint8_t[]);
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void setCursor(uint8_t, uint8_t);
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virtual void write(uint8_t);
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void command(uint8_t);
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private:
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void sendbyte( uint8_t val );
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uint8_t _displayfunction; //tokill
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uint8_t _displaycontrol;
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uint8_t _displaymode;
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uint8_t _initialized;
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uint8_t _numlines,_currline;
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};
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#endif
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