blob: a17dfcb669bc8a889690c5e2d29f96f3e1c1f620 (
plain)
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
|
/*
ChibiOS/HAL - Copyright (C) 2015 Uladzimir Pylinsky aka barthess
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file bitmap.c
* @brief Bit map code.
*
* @addtogroup bitmap
* @{
*/
#include "string.h" /* for memset() */
#include "hal.h"
#include "bitmap.h"
/*===========================================================================*/
/* Module local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local functions. */
/*===========================================================================*/
/**
* @brief Get word number.
*
* @param[in] bit number of the bit
*
* @return Index of the word containing specified bit.
*/
static inline size_t word(size_t bit) {
return bit / (sizeof(bitmap_word_t) * 8);
}
/**
* @brief Get bit position in word.
*
* @param[in] bit number of the bit
*
* @return Position of the specified bit related to word start.
*/
static inline size_t pos_in_word(size_t bit) {
return bit % (sizeof(bitmap_word_t) * 8);
}
/*===========================================================================*/
/* Module exported functions. */
/*===========================================================================*/
/**
* @brief Initializes an @p bitmap_t structure.
*
* @param[out] map the @p bitmap_t structure to be initialized
* @param[in] val the value to be written in all bitmap
*/
void bitmapObjectInit(bitmap_t *map, bitmap_word_t val) {
uint8_t pattern;
osalDbgCheck(val == 1 || val == 0);
if (val == 1)
pattern = 0xFF;
else
pattern = 0;
memset(map->array, pattern, map->len*sizeof(bitmap_word_t));
}
/**
* @brief Set single bit in an @p bitmap_t structure.
*
* @param[out] map the @p bitmap_t structure
* @param[in] bit number of the bit to be set
*/
void bitmapSet(bitmap_t *map, size_t bit) {
size_t w = word(bit);
osalDbgCheck(w < map->len);
map->array[w] |= (bitmap_word_t)1 << pos_in_word(bit);
}
/**
* @brief Clear single bit in an @p bitmap_t structure.
*
* @param[out] map the @p bitmap_t structure
* @param[in] bit number of the bit to be cleared
*/
void bitmapClear(bitmap_t *map, size_t bit) {
size_t w = word(bit);
osalDbgCheck(w < map->len);
map->array[w] &= ~((bitmap_word_t)1 << pos_in_word(bit));
}
/**
* @brief Invert single bit in an @p bitmap_t structure.
*
* @param[out] map the @p bitmap_t structure
* @param[in] bit number of the bit to be inverted
*/
void bitmapInvert(bitmap_t *map, size_t bit) {
size_t w = word(bit);
osalDbgCheck(w < map->len);
map->array[w] ^= (bitmap_word_t)1 << pos_in_word(bit);
}
/**
* @brief Get bit value from an @p bitmap_t structure.
*
* @param[in] map the @p bitmap_t structure
* @param[in] bit number of the requested bit
*
* @return Requested bit value.
*/
bitmap_word_t bitmapGet(const bitmap_t *map, size_t bit) {
size_t w = word(bit);
osalDbgCheck(w < map->len);
return (map->array[w] >> pos_in_word(bit)) & 1;
}
/**
* @brief Get total amount of bits in an @p bitmap_t structure.
*
* @param[in] map the @p bitmap_t structure
*
* @return Bit number.
*/
size_t bitmapGetBitsCount(const bitmap_t *map) {
return map->len * sizeof(bitmap_word_t) * 8;
}
/** @} */
|
