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Fork of BLE_API by Bluetooth Low Energy

ble/UUID.h@1135:d540a48f650d, 2016-04-06 (annotated)

Committer:
vcoubard
Date:
Wed Apr 06 19:13:52 2016 +0100
Revision:
1135:d540a48f650d
Parent:
1132:692ddf04fc42
Child:
1171:e8f2db0e8e11
Synchronized with git rev d363d7ee

Author: Rohit Grover

Merge branch 'develop'

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vcoubard 1132:692ddf04fc42 1 /* mbed Microcontroller Library
vcoubard 1132:692ddf04fc42 2 * Copyright (c) 2006-2013 ARM Limited
vcoubard 1132:692ddf04fc42 3 *
vcoubard 1132:692ddf04fc42 4 * Licensed under the Apache License, Version 2.0 (the "License");
vcoubard 1132:692ddf04fc42 5 * you may not use this file except in compliance with the License.
vcoubard 1132:692ddf04fc42 6 * You may obtain a copy of the License at
vcoubard 1132:692ddf04fc42 7 *
vcoubard 1132:692ddf04fc42 8 * http://www.apache.org/licenses/LICENSE-2.0
vcoubard 1132:692ddf04fc42 9 *
vcoubard 1132:692ddf04fc42 10 * Unless required by applicable law or agreed to in writing, software
vcoubard 1132:692ddf04fc42 11 * distributed under the License is distributed on an "AS IS" BASIS,
vcoubard 1132:692ddf04fc42 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
vcoubard 1132:692ddf04fc42 13 * See the License for the specific language governing permissions and
vcoubard 1132:692ddf04fc42 14 * limitations under the License.
vcoubard 1132:692ddf04fc42 15 */
vcoubard 1132:692ddf04fc42 16
vcoubard 1132:692ddf04fc42 17 #ifndef __UUID_H__
vcoubard 1132:692ddf04fc42 18 #define __UUID_H__
vcoubard 1132:692ddf04fc42 19
vcoubard 1132:692ddf04fc42 20 #include <stdint.h>
vcoubard 1132:692ddf04fc42 21 #include <string.h>
vcoubard 1135:d540a48f650d 22 #include <algorithm>
vcoubard 1132:692ddf04fc42 23
vcoubard 1132:692ddf04fc42 24 #include "blecommon.h"
vcoubard 1132:692ddf04fc42 25
vcoubard 1135:d540a48f650d 26 /**
vcoubard 1135:d540a48f650d 27 * A trivial converter for single hexadecimal character to unsigned-int.
vcoubard 1135:d540a48f650d 28 * @param c hexadecimal character.
vcoubard 1135:d540a48f650d 29 * @return the corresponding value as unsigned int.
vcoubard 1135:d540a48f650d 30 */
vcoubard 1135:d540a48f650d 31 static uint8_t char2int(char c) {
vcoubard 1135:d540a48f650d 32 if ((c >= '0') && (c <= '9')) {
vcoubard 1135:d540a48f650d 33 return c - '0';
vcoubard 1135:d540a48f650d 34 } else if ((c >= 'a') && (c <= 'f')) {
vcoubard 1135:d540a48f650d 35 return c - 'a' + 10;
vcoubard 1135:d540a48f650d 36 } else if ((c >= 'A') && (c <= 'F')) {
vcoubard 1135:d540a48f650d 37 return c - 'A' + 10;
vcoubard 1135:d540a48f650d 38 } else {
vcoubard 1135:d540a48f650d 39 return 0;
vcoubard 1135:d540a48f650d 40 }
vcoubard 1135:d540a48f650d 41 }
vcoubard 1135:d540a48f650d 42
vcoubard 1132:692ddf04fc42 43 class UUID {
vcoubard 1132:692ddf04fc42 44 public:
vcoubard 1132:692ddf04fc42 45 enum UUID_Type_t {
vcoubard 1132:692ddf04fc42 46 UUID_TYPE_SHORT = 0, // Short BLE UUID.
vcoubard 1132:692ddf04fc42 47 UUID_TYPE_LONG = 1 // Full 128-bit UUID.
vcoubard 1132:692ddf04fc42 48 };
vcoubard 1132:692ddf04fc42 49
vcoubard 1135:d540a48f650d 50 /**
vcoubard 1135:d540a48f650d 51 * An enumeration to specify byte ordering of the long version of the UUID.
vcoubard 1135:d540a48f650d 52 */
vcoubard 1135:d540a48f650d 53 typedef enum {
vcoubard 1135:d540a48f650d 54 MSB, /*!< Most-significant byte first (at the smallest address) */
vcoubard 1135:d540a48f650d 55 LSB /*!< least-significant byte first (at the smallest address) */
vcoubard 1135:d540a48f650d 56 } ByteOrder_t;
vcoubard 1135:d540a48f650d 57
vcoubard 1132:692ddf04fc42 58 typedef uint16_t ShortUUIDBytes_t;
vcoubard 1132:692ddf04fc42 59
vcoubard 1132:692ddf04fc42 60 static const unsigned LENGTH_OF_LONG_UUID = 16;
vcoubard 1132:692ddf04fc42 61 typedef uint8_t LongUUIDBytes_t[LENGTH_OF_LONG_UUID];
vcoubard 1132:692ddf04fc42 62
vcoubard 1135:d540a48f650d 63 static const unsigned MAX_UUID_STRING_LENGTH = LENGTH_OF_LONG_UUID * 2 + 4;
vcoubard 1135:d540a48f650d 64
vcoubard 1132:692ddf04fc42 65 public:
vcoubard 1135:d540a48f650d 66
vcoubard 1135:d540a48f650d 67 /**
vcoubard 1135:d540a48f650d 68 * Creates a new 128-bit UUID.
vcoubard 1135:d540a48f650d 69 *
vcoubard 1135:d540a48f650d 70 * @note The UUID is a unique 128-bit (16 byte) ID used to identify
vcoubard 1135:d540a48f650d 71 * different service or characteristics on the BLE device.
vcoubard 1135:d540a48f650d 72 *
vcoubard 1135:d540a48f650d 73 * @param stringUUID
vcoubard 1135:d540a48f650d 74 * The 128-bit (16-byte) UUID as a human readable const-string.
vcoubard 1135:d540a48f650d 75 * Format: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
vcoubard 1135:d540a48f650d 76 * Upper and lower case supported. Hyphens are optional, but only
vcoubard 1135:d540a48f650d 77 * upto four of them. The UUID is stored internally as a 16 byte
vcoubard 1135:d540a48f650d 78 * array, LSB (little endian), which is opposite from the string.
vcoubard 1135:d540a48f650d 79 */
vcoubard 1135:d540a48f650d 80 UUID(const char* stringUUID) : type(UUID_TYPE_LONG), baseUUID(), shortUUID(0) {
vcoubard 1135:d540a48f650d 81 bool nibble = false;
vcoubard 1135:d540a48f650d 82 uint8_t byte = 0;
vcoubard 1135:d540a48f650d 83 size_t baseIndex = 0;
vcoubard 1135:d540a48f650d 84 uint8_t tempUUID[LENGTH_OF_LONG_UUID];
vcoubard 1135:d540a48f650d 85
vcoubard 1135:d540a48f650d 86 // Iterate through string, abort if NULL is encountered prematurely.
vcoubard 1135:d540a48f650d 87 // Ignore upto four hyphens.
vcoubard 1135:d540a48f650d 88 for (size_t index = 0; (index < MAX_UUID_STRING_LENGTH) && (baseIndex < LENGTH_OF_LONG_UUID); index++) {
vcoubard 1135:d540a48f650d 89 if (stringUUID[index] == '\0') {
vcoubard 1135:d540a48f650d 90 // error abort
vcoubard 1135:d540a48f650d 91 break;
vcoubard 1135:d540a48f650d 92 } else if (stringUUID[index] == '-') {
vcoubard 1135:d540a48f650d 93 // ignore hyphen
vcoubard 1135:d540a48f650d 94 continue;
vcoubard 1135:d540a48f650d 95 } else if (nibble) {
vcoubard 1135:d540a48f650d 96 // got second nibble
vcoubard 1135:d540a48f650d 97 byte |= char2int(stringUUID[index]);
vcoubard 1135:d540a48f650d 98 nibble = false;
vcoubard 1135:d540a48f650d 99
vcoubard 1135:d540a48f650d 100 // store copy
vcoubard 1135:d540a48f650d 101 tempUUID[baseIndex++] = byte;
vcoubard 1135:d540a48f650d 102 } else {
vcoubard 1135:d540a48f650d 103 // got first nibble
vcoubard 1135:d540a48f650d 104 byte = char2int(stringUUID[index]) << 4;
vcoubard 1135:d540a48f650d 105 nibble = true;
vcoubard 1135:d540a48f650d 106 }
vcoubard 1135:d540a48f650d 107 }
vcoubard 1135:d540a48f650d 108
vcoubard 1135:d540a48f650d 109 // populate internal variables if string was successfully parsed
vcoubard 1135:d540a48f650d 110 if (baseIndex == LENGTH_OF_LONG_UUID) {
vcoubard 1135:d540a48f650d 111 setupLong(tempUUID, UUID::MSB);
vcoubard 1135:d540a48f650d 112 } else {
vcoubard 1135:d540a48f650d 113 const uint8_t sig[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
vcoubard 1135:d540a48f650d 114 0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB };
vcoubard 1135:d540a48f650d 115 setupLong(sig, UUID::MSB);
vcoubard 1135:d540a48f650d 116 }
vcoubard 1135:d540a48f650d 117 }
vcoubard 1135:d540a48f650d 118
vcoubard 1132:692ddf04fc42 119 /**
vcoubard 1132:692ddf04fc42 120 * Creates a new 128-bit UUID.
vcoubard 1132:692ddf04fc42 121 *
vcoubard 1132:692ddf04fc42 122 * @note The UUID is a unique 128-bit (16 byte) ID used to identify
vcoubard 1132:692ddf04fc42 123 * different service or characteristics on the BLE device.
vcoubard 1132:692ddf04fc42 124 *
vcoubard 1132:692ddf04fc42 125 * @param longUUID
vcoubard 1135:d540a48f650d 126 * The 128-bit (16-byte) UUID value.
vcoubard 1135:d540a48f650d 127 * @param order
vcoubard 1135:d540a48f650d 128 * The bit order of the UUID, MSB by default.
vcoubard 1132:692ddf04fc42 129 */
vcoubard 1135:d540a48f650d 130 UUID(const LongUUIDBytes_t longUUID, ByteOrder_t order = UUID::MSB) : type(UUID_TYPE_LONG), baseUUID(), shortUUID(0) {
vcoubard 1135:d540a48f650d 131 setupLong(longUUID, order);
vcoubard 1132:692ddf04fc42 132 }
vcoubard 1132:692ddf04fc42 133
vcoubard 1132:692ddf04fc42 134 /**
vcoubard 1132:692ddf04fc42 135 * Creates a new 16-bit UUID.
vcoubard 1132:692ddf04fc42 136 *
vcoubard 1132:692ddf04fc42 137 * @note The UUID is a unique 16-bit (2 byte) ID used to identify
vcoubard 1132:692ddf04fc42 138 * different service or characteristics on the BLE device.
vcoubard 1132:692ddf04fc42 139 *
vcoubard 1132:692ddf04fc42 140 * For efficiency, and because 16 bytes would take a large chunk of the
vcoubard 1132:692ddf04fc42 141 * 27-byte data payload length of the Link Layer, the BLE specification adds
vcoubard 1132:692ddf04fc42 142 * two additional UUID formats: 16-bit and 32-bit UUIDs. These shortened
vcoubard 1132:692ddf04fc42 143 * formats can be used only with UUIDs that are defined in the Bluetooth
vcoubard 1132:692ddf04fc42 144 * specification (listed by the Bluetooth SIG as standard
vcoubard 1132:692ddf04fc42 145 * Bluetooth UUIDs).
vcoubard 1132:692ddf04fc42 146 *
vcoubard 1132:692ddf04fc42 147 * To reconstruct the full 128-bit UUID from the shortened version, insert
vcoubard 1132:692ddf04fc42 148 * the 16-bit short value (indicated by xxxx, including leading zeros) into
vcoubard 1132:692ddf04fc42 149 * the Bluetooth Base UUID:
vcoubard 1132:692ddf04fc42 150 *
vcoubard 1132:692ddf04fc42 151 * 0000xxxx-0000-1000-8000-00805F9B34FB
vcoubard 1132:692ddf04fc42 152 *
vcoubard 1132:692ddf04fc42 153 * @note Shortening is not available for UUIDs that are not derived from the
vcoubard 1132:692ddf04fc42 154 * Bluetooth Base UUID. Such non-standard UUIDs are commonly called
vcoubard 1132:692ddf04fc42 155 * vendor-specific UUIDs. In these cases, you’ll need to use the full
vcoubard 1132:692ddf04fc42 156 * 128-bit UUID value at all times.
vcoubard 1132:692ddf04fc42 157 *
vcoubard 1132:692ddf04fc42 158 * @note We don't yet support 32-bit shortened UUIDs.
vcoubard 1132:692ddf04fc42 159 */
vcoubard 1132:692ddf04fc42 160 UUID(ShortUUIDBytes_t _shortUUID) : type(UUID_TYPE_SHORT), baseUUID(), shortUUID(_shortUUID) {
vcoubard 1132:692ddf04fc42 161 /* Empty */
vcoubard 1132:692ddf04fc42 162 }
vcoubard 1132:692ddf04fc42 163
vcoubard 1132:692ddf04fc42 164 UUID(const UUID &source) {
vcoubard 1132:692ddf04fc42 165 type = source.type;
vcoubard 1132:692ddf04fc42 166 shortUUID = source.shortUUID;
vcoubard 1132:692ddf04fc42 167 memcpy(baseUUID, source.baseUUID, LENGTH_OF_LONG_UUID);
vcoubard 1132:692ddf04fc42 168 }
vcoubard 1132:692ddf04fc42 169
vcoubard 1132:692ddf04fc42 170 UUID(void) : type(UUID_TYPE_SHORT), shortUUID(BLE_UUID_UNKNOWN) {
vcoubard 1132:692ddf04fc42 171 /* empty */
vcoubard 1132:692ddf04fc42 172 }
vcoubard 1132:692ddf04fc42 173
vcoubard 1132:692ddf04fc42 174 /**
vcoubard 1132:692ddf04fc42 175 * Fill in a 128-bit UUID; this is useful when the UUID isn't known at the time of the object construction.
vcoubard 1132:692ddf04fc42 176 */
vcoubard 1135:d540a48f650d 177 void setupLong(const LongUUIDBytes_t longUUID, ByteOrder_t order = UUID::MSB) {
vcoubard 1132:692ddf04fc42 178 type = UUID_TYPE_LONG;
vcoubard 1135:d540a48f650d 179 if (order == UUID::MSB) {
vcoubard 1135:d540a48f650d 180 // Switch endian. Input is big-endian, internal representation is little endian.
vcoubard 1135:d540a48f650d 181 std::reverse_copy(longUUID, longUUID + LENGTH_OF_LONG_UUID, baseUUID);
vcoubard 1135:d540a48f650d 182 } else {
vcoubard 1135:d540a48f650d 183 std::copy(longUUID, longUUID + LENGTH_OF_LONG_UUID, baseUUID);
vcoubard 1135:d540a48f650d 184 }
vcoubard 1135:d540a48f650d 185 shortUUID = (uint16_t)((baseUUID[13] << 8) | (baseUUID[12]));
vcoubard 1132:692ddf04fc42 186 }
vcoubard 1132:692ddf04fc42 187
vcoubard 1132:692ddf04fc42 188 public:
vcoubard 1132:692ddf04fc42 189 UUID_Type_t shortOrLong(void) const {return type; }
vcoubard 1132:692ddf04fc42 190 const uint8_t *getBaseUUID(void) const {
vcoubard 1132:692ddf04fc42 191 if (type == UUID_TYPE_SHORT) {
vcoubard 1132:692ddf04fc42 192 return (const uint8_t*)&shortUUID;
vcoubard 1132:692ddf04fc42 193 } else {
vcoubard 1132:692ddf04fc42 194 return baseUUID;
vcoubard 1132:692ddf04fc42 195 }
vcoubard 1132:692ddf04fc42 196 }
vcoubard 1132:692ddf04fc42 197
vcoubard 1132:692ddf04fc42 198 ShortUUIDBytes_t getShortUUID(void) const {return shortUUID;}
vcoubard 1132:692ddf04fc42 199 uint8_t getLen(void) const {
vcoubard 1132:692ddf04fc42 200 return ((type == UUID_TYPE_SHORT) ? sizeof(ShortUUIDBytes_t) : LENGTH_OF_LONG_UUID);
vcoubard 1132:692ddf04fc42 201 }
vcoubard 1132:692ddf04fc42 202
vcoubard 1132:692ddf04fc42 203 bool operator== (const UUID &other) const {
vcoubard 1132:692ddf04fc42 204 if ((this->type == UUID_TYPE_SHORT) && (other.type == UUID_TYPE_SHORT) &&
vcoubard 1132:692ddf04fc42 205 (this->shortUUID == other.shortUUID)) {
vcoubard 1132:692ddf04fc42 206 return true;
vcoubard 1132:692ddf04fc42 207 }
vcoubard 1132:692ddf04fc42 208
vcoubard 1132:692ddf04fc42 209 if ((this->type == UUID_TYPE_LONG) && (other.type == UUID_TYPE_LONG) &&
vcoubard 1132:692ddf04fc42 210 (memcmp(this->baseUUID, other.baseUUID, LENGTH_OF_LONG_UUID) == 0)) {
vcoubard 1132:692ddf04fc42 211 return true;
vcoubard 1132:692ddf04fc42 212 }
vcoubard 1132:692ddf04fc42 213
vcoubard 1132:692ddf04fc42 214 return false;
vcoubard 1132:692ddf04fc42 215 }
vcoubard 1132:692ddf04fc42 216
vcoubard 1132:692ddf04fc42 217 bool operator!= (const UUID &other) const {
vcoubard 1132:692ddf04fc42 218 return !(*this == other);
vcoubard 1132:692ddf04fc42 219 }
vcoubard 1132:692ddf04fc42 220
vcoubard 1132:692ddf04fc42 221 private:
vcoubard 1132:692ddf04fc42 222 UUID_Type_t type; // UUID_TYPE_SHORT or UUID_TYPE_LONG
vcoubard 1135:d540a48f650d 223 LongUUIDBytes_t baseUUID; // The long UUID
vcoubard 1135:d540a48f650d 224 ShortUUIDBytes_t shortUUID; // 16 bit UUID
vcoubard 1132:692ddf04fc42 225 };
vcoubard 1132:692ddf04fc42 226
rgrover1 710:b2e1a2660ec2 227 #endif // ifndef __UUID_H__