-
Notifications
You must be signed in to change notification settings - Fork 0
/
EEPROM.h
168 lines (125 loc) · 5.62 KB
/
EEPROM.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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/*
EEPROM.h - EEPROM library
Original Copyright (c) 2006 David A. Mellis. All right reserved.
New version by Christopher Andrews 2015.
This copy has minor modificatons for use with Teensy, by Paul Stoffregen
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef EEPROM_h
#define EEPROM_h
#define E2END 0x7FF
#include "inttypes.h"
#include "stddef.h"
#include "stdint.h"
#include "avr_functions.h"
#include "io.h"
/***
EERef class.
This object references an EEPROM cell.
Its purpose is to mimic a typical byte of RAM, however its storage is the EEPROM.
This class has an overhead of two bytes, similar to storing a pointer to an EEPROM cell.
***/
struct EERef {
EERef( const int index )
: index( index ) {}
//Access/read members.
uint8_t operator*() const { return eeprom_read_byte( (uint8_t*) index ); }
operator const uint8_t() const { return **this; }
//Assignment/write members.
EERef &operator=( const EERef &ref ) { return *this = *ref; }
EERef &operator=( uint8_t in ) { return eeprom_write_byte( (uint8_t*) index, in ), *this; }
EERef &operator +=( uint8_t in ) { return *this = **this + in; }
EERef &operator -=( uint8_t in ) { return *this = **this - in; }
EERef &operator *=( uint8_t in ) { return *this = **this * in; }
EERef &operator /=( uint8_t in ) { return *this = **this / in; }
EERef &operator ^=( uint8_t in ) { return *this = **this ^ in; }
EERef &operator %=( uint8_t in ) { return *this = **this % in; }
EERef &operator &=( uint8_t in ) { return *this = **this & in; }
EERef &operator |=( uint8_t in ) { return *this = **this | in; }
EERef &operator <<=( uint8_t in ) { return *this = **this << in; }
EERef &operator >>=( uint8_t in ) { return *this = **this >> in; }
EERef &update( uint8_t in ) { return in != *this ? *this = in : *this; }
/** Prefix increment/decrement **/
EERef& operator++() { return *this += 1; }
EERef& operator--() { return *this -= 1; }
/** Postfix increment/decrement **/
uint8_t operator++ (int) {
uint8_t ret = **this;
return ++(*this), ret;
}
uint8_t operator-- (int) {
uint8_t ret = **this;
return --(*this), ret;
}
int index; //Index of current EEPROM cell.
};
/***
EEPtr class.
This object is a bidirectional pointer to EEPROM cells represented by EERef objects.
Just like a normal pointer type, this can be dereferenced and repositioned using
increment/decrement operators.
***/
struct EEPtr {
EEPtr( const int index )
: index( index ) {}
operator const int() const { return index; }
EEPtr &operator=( int in ) { return index = in, *this; }
//Iterator functionality.
bool operator!=( const EEPtr &ptr ) { return index != ptr.index; }
EERef operator*() { return index; }
/** Prefix & Postfix increment/decrement **/
EEPtr& operator++() { return ++index, *this; }
EEPtr& operator--() { return --index, *this; }
EEPtr operator++ (int) { return index++; }
EEPtr operator-- (int) { return index--; }
int index; //Index of current EEPROM cell.
};
/***
EEPROMClass class.
This object represents the entire EEPROM space.
It wraps the functionality of EEPtr and EERef into a basic interface.
This class is also 100% backwards compatible with earlier Arduino core releases.
***/
struct EEPROMClass {
#if defined(__arm__) && defined(TEENSYDUINO)
EEPROMClass() { eeprom_initialize(); }
#endif
// Basic user access methods.
EERef operator[]( const int idx ) { return idx; }
uint8_t read( int idx ) { return EERef( idx ); }
void write( int idx, uint8_t val ) { (EERef( idx )) = val; }
void update( int idx, uint8_t val ) { EERef( idx ).update( val ); }
// STL and C++11 iteration capability.
EEPtr begin() { return 0x00; }
EEPtr end() { return length(); } // Standards requires this to be the item after the last valid entry. The returned pointer is invalid.
uint16_t length() { return E2END + 1; }
//Functionality to 'get' and 'put' objects to and from EEPROM.
template< typename T > T &get( int idx, T &t ){
EEPtr e = idx;
uint8_t *ptr = (uint8_t*) &t;
for( int count = sizeof(T) ; count ; --count, ++e ) *ptr++ = *e;
return t;
}
template< typename T > const T &put( int idx, const T &t ) {
const uint8_t *ptr = (const uint8_t*) &t;
#ifdef __arm__
eeprom_write_block(ptr, (void *)idx, sizeof(T));
#else
EEPtr e = idx;
for( int count = sizeof(T) ; count ; --count, ++e ) (*e).update( *ptr++ );
#endif
return t;
}
};
static EEPROMClass EEPROM;
#endif