mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-12-25 13:41:23 +01:00
100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
/*
|
|
* © 2021, Neil McKechnie. All rights reserved.
|
|
* Based on the work by DFRobot, Frank de Brabander and Marco Schwartz.
|
|
*
|
|
* This file is part of CommandStation-EX
|
|
*
|
|
* This is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* It is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef LiquidCrystal_I2C_h
|
|
#define LiquidCrystal_I2C_h
|
|
|
|
#include <Arduino.h>
|
|
#include "Display.h"
|
|
#include "I2CManager.h"
|
|
|
|
// commands
|
|
#define LCD_CLEARDISPLAY 0x01
|
|
#define LCD_ENTRYMODESET 0x04
|
|
#define LCD_DISPLAYCONTROL 0x08
|
|
#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_CURSOROFF 0x00
|
|
#define LCD_BLINKOFF 0x00
|
|
|
|
// flags for function set
|
|
#define LCD_4BITMODE 0x00
|
|
#define LCD_2LINE 0x08
|
|
#define LCD_1LINE 0x00
|
|
#define LCD_5x8DOTS 0x00
|
|
|
|
// Bit mapping onto PCF8574 port
|
|
#define BACKPACK_Rs_BIT 0
|
|
#define BACKPACK_Rw_BIT 1
|
|
#define BACKPACK_En_BIT 2
|
|
#define BACKPACK_BACKLIGHT_BIT 3
|
|
#define BACKPACK_DATA_BITS 4 // Bits 4-7
|
|
// Equivalent mask bits
|
|
#define LCD_BACKLIGHT (1 << BACKPACK_BACKLIGHT_BIT) // Backlight enable
|
|
#define En (1 << BACKPACK_En_BIT) // Enable bit
|
|
#define Rw (1 << BACKPACK_Rw_BIT) // Read/Write bit
|
|
#define Rs (1 << BACKPACK_Rs_BIT) // Register select bit
|
|
|
|
class LiquidCrystal_I2C : public DisplayDevice {
|
|
public:
|
|
LiquidCrystal_I2C(I2CAddress lcd_Addr,uint8_t lcd_cols,uint8_t lcd_rows);
|
|
bool begin() override;
|
|
void clearNative() override;
|
|
void setRowNative(byte line) override;
|
|
size_t writeNative(uint8_t c) override;
|
|
// I/O is synchronous, so if this is called we're not busy!
|
|
bool isBusy() override;
|
|
|
|
void display();
|
|
void noBacklight();
|
|
void backlight();
|
|
|
|
void command(uint8_t);
|
|
uint16_t getNumCols() { return lcdCols; }
|
|
uint16_t getNumRows() { return lcdRows; }
|
|
|
|
|
|
private:
|
|
void send(uint8_t, uint8_t);
|
|
void write4bits(uint8_t);
|
|
void expanderWrite(uint8_t);
|
|
uint8_t lcdCols=0, lcdRows=0;
|
|
I2CAddress _Addr;
|
|
uint8_t _displayfunction;
|
|
uint8_t _displaycontrol;
|
|
uint8_t _displaymode;
|
|
uint8_t _backlightval = 0;
|
|
|
|
uint8_t outputBuffer[4];
|
|
I2CRB rb;
|
|
};
|
|
|
|
#endif
|