i2clcd.h

/*
 * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
 * Copyright (c) 2014 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#pragma once

#include <string>
#include <mraa/i2c.hpp>

namespace upm
{
// commands
const uint8_t LCD_CLEARDISPLAY = 0x01;
const uint8_t LCD_RETURNHOME = 0x02;
const uint8_t LCD_ENTRYMODESET = 0x04;
const uint8_t LCD_DISPLAYCONTROL = 0x08;
const uint8_t LCD_CURSORSHIFT = 0x10;
const uint8_t LCD_FUNCTIONSET = 0x20;
const uint8_t LCD_DATA = 0x40;
const uint8_t LCD_CMD = 0x80;

const uint8_t LCD_BACKLIGHT = 0x08;
const uint8_t LCD_NOBACKLIGHT = 0x00;

// flags for display entry mode
const uint8_t LCD_ENTRYRIGHT = 0x00;
const uint8_t LCD_ENTRYLEFT = 0x02;
const uint8_t LCD_ENTRYSHIFTINCREMENT = 0x01;
const uint8_t LCD_ENTRYSHIFTDECREMENT = 0x00;

// flags for display on/off control
const uint8_t LCD_DISPLAYON = 0x04;
const uint8_t LCD_DISPLAYOFF = 0x00;
const uint8_t LCD_CURSORON = 0x02;
const uint8_t LCD_CURSOROFF = 0x00;
const uint8_t LCD_BLINKON = 0x01;
const uint8_t LCD_BLINKOFF = 0x00;

// flags for display/cursor shift
const uint8_t LCD_DISPLAYMOVE = 0x08;
const uint8_t LCD_MOVERIGHT = 0x04;
const uint8_t LCD_MOVELEFT = 0x00;

// flags for function set
const uint8_t LCD_8BITMODE = 0x10;
const uint8_t LCD_4BITMODE = 0x00;
const uint8_t LCD_2LINE = 0x08;
const uint8_t LCD_1LINE = 0x00;
const uint8_t LCD_5x10DOTS = 0x04;
const uint8_t LCD_5x8DOTS = 0x00;

// flags for CGRAM
const uint8_t LCD_SETCGRAMADDR = 0x40;

const uint8_t LCD_EN = 0x04; // Enable bit
const uint8_t LCD_RW = 0x02; // Read/Write bit
const uint8_t LCD_RS = 0x01; // Register select bit

class I2CLcd
{
  public:
    I2CLcd(int bus, int lcdAddress);
    mraa_result_t write(int x, int y, std::string msg);

    virtual mraa_result_t write(std::string msg) = 0;
    virtual mraa_result_t setCursor(int row, int column) = 0;
    virtual mraa_result_t clear() = 0;
    virtual mraa_result_t home() = 0;
    virtual mraa_result_t createChar(uint8_t charSlot, uint8_t charData[]);

    std::string name();

  protected:
    std::string m_name;
    int m_lcd_control_address;
    int m_bus;

    mraa::I2c m_i2c_lcd_control;
};
}