-
-
Notifications
You must be signed in to change notification settings - Fork 107
/
LiquidCrystal_I2C.h
99 lines (85 loc) · 2.77 KB
/
LiquidCrystal_I2C.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
/*
* © 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