Glimworm Beacons / nRF51822

test

Fork of nRF51822 by Nordic Semiconductor

btle/custom/custom_helper.cpp@119:3ba3e377b972, 2015-04-30 (annotated)

Committer:
rgrover1
Date:
Thu Apr 30 08:34:38 2015 +0100
Revision:
119:3ba3e377b972
Parent:
109:425faebc8201
Child:
126:e6114201f092
Synchronized with git rev ac865c5e

Author: Rohit Grover

Fixes #9: Handle user-description-descriptor properly.

Also tracked by https://github.com/mbedmicro/BLE_API/issues/38

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Rohit Grover 22:c6ee8136847e 1 /* mbed Microcontroller Library
Rohit Grover 22:c6ee8136847e 2 * Copyright (c) 2006-2013 ARM Limited
Rohit Grover 22:c6ee8136847e 3 *
Rohit Grover 22:c6ee8136847e 4 * Licensed under the Apache License, Version 2.0 (the "License");
Rohit Grover 22:c6ee8136847e 5 * you may not use this file except in compliance with the License.
Rohit Grover 22:c6ee8136847e 6 * You may obtain a copy of the License at
Rohit Grover 22:c6ee8136847e 7 *
Rohit Grover 22:c6ee8136847e 8 * http://www.apache.org/licenses/LICENSE-2.0
Rohit Grover 22:c6ee8136847e 9 *
Rohit Grover 22:c6ee8136847e 10 * Unless required by applicable law or agreed to in writing, software
Rohit Grover 22:c6ee8136847e 11 * distributed under the License is distributed on an "AS IS" BASIS,
Rohit Grover 22:c6ee8136847e 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Rohit Grover 22:c6ee8136847e 13 * See the License for the specific language governing permissions and
Rohit Grover 22:c6ee8136847e 14 * limitations under the License.
Rohit Grover 22:c6ee8136847e 15 */
Rohit Grover 22:c6ee8136847e 16
Rohit Grover 22:c6ee8136847e 17 #include "custom_helper.h"
Rohit Grover 22:c6ee8136847e 18
Rohit Grover 22:c6ee8136847e 19 /*
Rohit Grover 22:c6ee8136847e 20 * The current version of the soft-device doesn't handle duplicate 128-bit UUIDs
Rohit Grover 22:c6ee8136847e 21 * very well. It is therefore necessary to filter away duplicates before
Rohit Grover 22:c6ee8136847e 22 * passing long UUIDs to sd_ble_uuid_vs_add(). The following types and data
Rohit Grover 22:c6ee8136847e 23 * structures involved in maintaining a local cache of 128-bit UUIDs.
Rohit Grover 22:c6ee8136847e 24 */
Rohit Grover 22:c6ee8136847e 25 typedef struct {
Rohit Grover 56:a1071b629aa3 26 LongUUIDBytes_t uuid;
Rohit Grover 56:a1071b629aa3 27 uint8_t type;
Rohit Grover 22:c6ee8136847e 28 } converted_uuid_table_entry_t;
Rohit Grover 66:b3680699d9a4 29 static const unsigned UUID_TABLE_MAX_ENTRIES = 8; /* This is the maximum number of 128-bit UUIDs with distinct bases that
Rohit Grover 66:b3680699d9a4 30 * we expect to be in use; increase this limit if needed. */
Rohit Grover 22:c6ee8136847e 31 static unsigned uuidTableEntries = 0; /* current usage of the table */
Rohit Grover 22:c6ee8136847e 32 converted_uuid_table_entry_t convertedUUIDTable[UUID_TABLE_MAX_ENTRIES];
Rohit Grover 22:c6ee8136847e 33
Rohit Grover 22:c6ee8136847e 34 /**
Rohit Grover 22:c6ee8136847e 35 * lookup the cache of previously converted 128-bit UUIDs to find a type value.
Rohit Grover 66:b3680699d9a4 36 * @param uuid base 128-bit UUID
Rohit Grover 22:c6ee8136847e 37 * @param recoveredType the type field of the 3-byte nRF's uuid.
Rohit Grover 22:c6ee8136847e 38 * @return true if a match is found.
Rohit Grover 22:c6ee8136847e 39 */
Rohit Grover 22:c6ee8136847e 40 static bool
Rohit Grover 56:a1071b629aa3 41 lookupConvertedUUIDTable(const LongUUIDBytes_t uuid, uint8_t *recoveredType)
Rohit Grover 22:c6ee8136847e 42 {
Rohit Grover 22:c6ee8136847e 43 unsigned i;
Rohit Grover 22:c6ee8136847e 44 for (i = 0; i < uuidTableEntries; i++) {
rgrover1 97:e95e35845e1c 45 unsigned byteIndex;
rgrover1 97:e95e35845e1c 46 for (byteIndex = 0; byteIndex < LENGTH_OF_LONG_UUID; byteIndex++) {
rgrover1 97:e95e35845e1c 47 /* Skip bytes 2 and 3, because they contain the shortUUID (16-bit) version of the
rgrover1 97:e95e35845e1c 48 * long UUID; and we're comparing against the remainder. */
rgrover1 97:e95e35845e1c 49 if ((byteIndex == 2) || (byteIndex == 3)) {
rgrover1 97:e95e35845e1c 50 continue;
rgrover1 97:e95e35845e1c 51 }
rgrover1 97:e95e35845e1c 52
rgrover1 97:e95e35845e1c 53 if (convertedUUIDTable[i].uuid[byteIndex] != uuid[byteIndex]) {
rgrover1 97:e95e35845e1c 54 break;
rgrover1 97:e95e35845e1c 55 }
rgrover1 97:e95e35845e1c 56 }
rgrover1 97:e95e35845e1c 57
rgrover1 97:e95e35845e1c 58 if (byteIndex == LENGTH_OF_LONG_UUID) {
Rohit Grover 22:c6ee8136847e 59 *recoveredType = convertedUUIDTable[i].type;
Rohit Grover 22:c6ee8136847e 60 return true;
Rohit Grover 22:c6ee8136847e 61 }
Rohit Grover 22:c6ee8136847e 62 }
Rohit Grover 22:c6ee8136847e 63
Rohit Grover 22:c6ee8136847e 64 return false;
Rohit Grover 22:c6ee8136847e 65 }
Rohit Grover 22:c6ee8136847e 66
Rohit Grover 22:c6ee8136847e 67 static void
Rohit Grover 56:a1071b629aa3 68 addToConvertedUUIDTable(const LongUUIDBytes_t uuid, uint8_t type)
Rohit Grover 22:c6ee8136847e 69 {
Rohit Grover 22:c6ee8136847e 70 if (uuidTableEntries == UUID_TABLE_MAX_ENTRIES) {
Rohit Grover 66:b3680699d9a4 71 return; /* recovery needed; or at least the user should be warned about this fact.*/
Rohit Grover 22:c6ee8136847e 72 }
Rohit Grover 22:c6ee8136847e 73
rgrover1 97:e95e35845e1c 74 memcpy(convertedUUIDTable[uuidTableEntries].uuid, uuid, LENGTH_OF_LONG_UUID);
rgrover1 97:e95e35845e1c 75 convertedUUIDTable[uuidTableEntries].uuid[2] = 0;
rgrover1 97:e95e35845e1c 76 convertedUUIDTable[uuidTableEntries].uuid[3] = 0;
rgrover1 97:e95e35845e1c 77 convertedUUIDTable[uuidTableEntries].type = type;
Rohit Grover 22:c6ee8136847e 78 uuidTableEntries++;
Rohit Grover 22:c6ee8136847e 79 }
Rohit Grover 22:c6ee8136847e 80
Rohit Grover 22:c6ee8136847e 81 /**
Rohit Grover 22:c6ee8136847e 82 * The nRF transport has its own 3-byte representation of a UUID. If the user-
Rohit Grover 22:c6ee8136847e 83 * specified UUID is 128-bits wide, then the UUID base needs to be added to the
Rohit Grover 22:c6ee8136847e 84 * soft-device and converted to a 3-byte handle before being used further. This
Rohit Grover 22:c6ee8136847e 85 * function is responsible for this translation of user-specified UUIDs into
Rohit Grover 22:c6ee8136847e 86 * nRF's representation.
Rohit Grover 22:c6ee8136847e 87 *
Rohit Grover 22:c6ee8136847e 88 * @param[in] uuid
Rohit Grover 22:c6ee8136847e 89 * user-specified UUID
Rohit Grover 22:c6ee8136847e 90 * @return nRF
Rohit Grover 22:c6ee8136847e 91 * 3-byte UUID (containing a type and 16-bit UUID) representation
Rohit Grover 22:c6ee8136847e 92 * to be used with SVC calls.
Rohit Grover 22:c6ee8136847e 93 */
Rohit Grover 22:c6ee8136847e 94 ble_uuid_t custom_convert_to_nordic_uuid(const UUID &uuid)
Rohit Grover 22:c6ee8136847e 95 {
rgrover1 109:425faebc8201 96 ble_uuid_t nordicUUID;
rgrover1 109:425faebc8201 97 nordicUUID.uuid = uuid.getShortUUID();
rgrover1 109:425faebc8201 98 nordicUUID.type = BLE_UUID_TYPE_UNKNOWN; /* to be set below */
Rohit Grover 22:c6ee8136847e 99
Rohit Grover 22:c6ee8136847e 100 if (uuid.shortOrLong() == UUID::UUID_TYPE_SHORT) {
Rohit Grover 22:c6ee8136847e 101 nordicUUID.type = BLE_UUID_TYPE_BLE;
Rohit Grover 22:c6ee8136847e 102 } else {
Rohit Grover 22:c6ee8136847e 103 if (!lookupConvertedUUIDTable(uuid.getBaseUUID(), &nordicUUID.type)) {
Rohit Grover 22:c6ee8136847e 104 nordicUUID.type = custom_add_uuid_base(uuid.getBaseUUID());
Rohit Grover 22:c6ee8136847e 105 addToConvertedUUIDTable(uuid.getBaseUUID(), nordicUUID.type);
Rohit Grover 22:c6ee8136847e 106 }
Rohit Grover 22:c6ee8136847e 107 }
Rohit Grover 22:c6ee8136847e 108
Rohit Grover 22:c6ee8136847e 109 return nordicUUID;
Rohit Grover 22:c6ee8136847e 110 }
Rohit Grover 22:c6ee8136847e 111
Rohit Grover 22:c6ee8136847e 112 /**************************************************************************/
Rohit Grover 22:c6ee8136847e 113 /*!
Rohit Grover 22:c6ee8136847e 114 @brief Adds the base UUID to the custom service. All UUIDs used
Rohit Grover 22:c6ee8136847e 115 by this service are based on this 128-bit UUID.
Rohit Grover 22:c6ee8136847e 116
Rohit Grover 22:c6ee8136847e 117 @note This UUID needs to be added to the SoftDevice stack before
Rohit Grover 22:c6ee8136847e 118 adding the service's primary service via
Rohit Grover 22:c6ee8136847e 119 'sd_ble_gatts_service_add'
Rohit Grover 22:c6ee8136847e 120
Rohit Grover 22:c6ee8136847e 121 @param[in] p_uuid_base A pointer to the 128-bit UUID array (8*16)
Rohit Grover 22:c6ee8136847e 122
Rohit Grover 22:c6ee8136847e 123 @returns The UUID type.
Rohit Grover 22:c6ee8136847e 124 A return value of 0 should be considered an error.
Rohit Grover 22:c6ee8136847e 125
Rohit Grover 22:c6ee8136847e 126 @retval 0x00 BLE_UUID_TYPE_UNKNOWN
Rohit Grover 22:c6ee8136847e 127 @retval 0x01 BLE_UUID_TYPE_BLE
Rohit Grover 22:c6ee8136847e 128 @retval 0x02 BLE_UUID_TYPE_VENDOR_BEGIN
Rohit Grover 22:c6ee8136847e 129
Rohit Grover 22:c6ee8136847e 130 @section EXAMPLE
Rohit Grover 22:c6ee8136847e 131 @code
Rohit Grover 22:c6ee8136847e 132
Rohit Grover 22:c6ee8136847e 133 // Take note that bytes 2/3 are blank since these are used to identify
Rohit Grover 22:c6ee8136847e 134 // the primary service and individual characteristics
Rohit Grover 22:c6ee8136847e 135 #define CFG_CUSTOM_UUID_BASE "\x6E\x40\x00\x00\xB5\xA3\xF3\x93\xE0\xA9\xE5\x0E\x24\xDC\xCA\x9E"
Rohit Grover 22:c6ee8136847e 136
Rohit Grover 22:c6ee8136847e 137 uint8_t uuid_type = custom_add_uuid_base(CFG_CUSTOM_UUID_BASE);
Rohit Grover 22:c6ee8136847e 138 ASSERT(uuid_type > 0, ERROR_NOT_FOUND);
Rohit Grover 22:c6ee8136847e 139
Rohit Grover 22:c6ee8136847e 140 // We can now safely add the primary service and any characteristics
Rohit Grover 22:c6ee8136847e 141 // for our custom service ...
Rohit Grover 22:c6ee8136847e 142
Rohit Grover 22:c6ee8136847e 143 @endcode
Rohit Grover 22:c6ee8136847e 144 */
Rohit Grover 22:c6ee8136847e 145 /**************************************************************************/
Rohit Grover 22:c6ee8136847e 146 uint8_t custom_add_uuid_base(uint8_t const *const p_uuid_base)
Rohit Grover 22:c6ee8136847e 147 {
Rohit Grover 22:c6ee8136847e 148 ble_uuid128_t base_uuid;
Rohit Grover 22:c6ee8136847e 149 uint8_t uuid_type = 0;
Rohit Grover 22:c6ee8136847e 150
Rohit Grover 22:c6ee8136847e 151 /* Reverse the bytes since ble_uuid128_t is LSB */
rgrover1 97:e95e35845e1c 152 for (unsigned i = 0; i < LENGTH_OF_LONG_UUID; i++) {
rgrover1 97:e95e35845e1c 153 base_uuid.uuid128[i] = p_uuid_base[LENGTH_OF_LONG_UUID - 1 - i];
Rohit Grover 22:c6ee8136847e 154 }
Rohit Grover 22:c6ee8136847e 155
Rohit Grover 22:c6ee8136847e 156 ASSERT_INT( ERROR_NONE, sd_ble_uuid_vs_add( &base_uuid, &uuid_type ), 0);
Rohit Grover 22:c6ee8136847e 157
Rohit Grover 22:c6ee8136847e 158 return uuid_type;
Rohit Grover 22:c6ee8136847e 159 }
Rohit Grover 22:c6ee8136847e 160
Rohit Grover 22:c6ee8136847e 161 /**************************************************************************/
Rohit Grover 22:c6ee8136847e 162 /*!
Rohit Grover 22:c6ee8136847e 163
Rohit Grover 22:c6ee8136847e 164 */
Rohit Grover 22:c6ee8136847e 165 /**************************************************************************/
Rohit Grover 22:c6ee8136847e 166 error_t custom_decode_uuid_base(uint8_t const *const p_uuid_base,
Rohit Grover 22:c6ee8136847e 167 ble_uuid_t *p_uuid)
Rohit Grover 22:c6ee8136847e 168 {
Rohit Grover 56:a1071b629aa3 169 LongUUIDBytes_t uuid_base_le;
Rohit Grover 22:c6ee8136847e 170
Rohit Grover 22:c6ee8136847e 171 /* Reverse the bytes since ble_uuid128_t is LSB */
rgrover1 97:e95e35845e1c 172 for (uint8_t i = 0; i < LENGTH_OF_LONG_UUID; i++) {
rgrover1 97:e95e35845e1c 173 uuid_base_le[i] = p_uuid_base[LENGTH_OF_LONG_UUID - 1 - i];
Rohit Grover 22:c6ee8136847e 174 }
Rohit Grover 22:c6ee8136847e 175
rgrover1 97:e95e35845e1c 176 ASSERT_STATUS( sd_ble_uuid_decode(LENGTH_OF_LONG_UUID, uuid_base_le, p_uuid));
Rohit Grover 22:c6ee8136847e 177
Rohit Grover 22:c6ee8136847e 178 return ERROR_NONE;
Rohit Grover 22:c6ee8136847e 179 }
Rohit Grover 22:c6ee8136847e 180
Rohit Grover 22:c6ee8136847e 181 /**************************************************************************/
Rohit Grover 22:c6ee8136847e 182 /*!
Rohit Grover 22:c6ee8136847e 183 @brief Adds a new characteristic to the custom service, assigning
Rohit Grover 22:c6ee8136847e 184 properties, a UUID add-on value, etc.
Rohit Grover 22:c6ee8136847e 185
Rohit Grover 22:c6ee8136847e 186 @param[in] service_handle
Rohit Grover 22:c6ee8136847e 187 @param[in] p_uuid The 16-bit value to add to the base UUID
Rohit Grover 22:c6ee8136847e 188 for this characteristic (normally >1
Rohit Grover 22:c6ee8136847e 189 since 1 is typically used by the primary
Rohit Grover 22:c6ee8136847e 190 service).
Rohit Grover 22:c6ee8136847e 191 @param[in] char_props The characteristic properties, as
Rohit Grover 22:c6ee8136847e 192 defined by ble_gatt_char_props_t
Rohit Grover 22:c6ee8136847e 193 @param[in] max_length The maximum length of this characeristic
Rohit Grover 22:c6ee8136847e 194 @param[in] p_char_handle
Rohit Grover 22:c6ee8136847e 195
Rohit Grover 22:c6ee8136847e 196 @returns
Rohit Grover 22:c6ee8136847e 197 @retval ERROR_NONE Everything executed normally
Rohit Grover 22:c6ee8136847e 198 */
Rohit Grover 22:c6ee8136847e 199 /**************************************************************************/
Rohit Grover 22:c6ee8136847e 200 error_t custom_add_in_characteristic(uint16_t service_handle,
Rohit Grover 22:c6ee8136847e 201 ble_uuid_t *p_uuid,
Rohit Grover 22:c6ee8136847e 202 uint8_t properties,
Rohit Grover 22:c6ee8136847e 203 uint8_t *p_data,
Rohit Grover 22:c6ee8136847e 204 uint16_t min_length,
Rohit Grover 22:c6ee8136847e 205 uint16_t max_length,
rgrover1 119:3ba3e377b972 206 const uint8_t *userDescriptionDescriptorValuePtr,
rgrover1 119:3ba3e377b972 207 uint16_t userDescriptionDescriptorValueLen,
rgrover1 83:71302acf1804 208 bool readAuthorization,
rgrover1 82:6c51cbe4bc12 209 bool writeAuthorization,
Rohit Grover 22:c6ee8136847e 210 ble_gatts_char_handles_t *p_char_handle)
Rohit Grover 22:c6ee8136847e 211 {
Rohit Grover 22:c6ee8136847e 212 /* Characteristic metadata */
Rohit Grover 22:c6ee8136847e 213 ble_gatts_attr_md_t cccd_md;
Rohit Grover 22:c6ee8136847e 214 ble_gatt_char_props_t char_props;
Rohit Grover 22:c6ee8136847e 215
Rohit Grover 22:c6ee8136847e 216 memcpy(&char_props, &properties, 1);
Rohit Grover 22:c6ee8136847e 217
Rohit Grover 22:c6ee8136847e 218 if (char_props.notify || char_props.indicate) {
Rohit Grover 22:c6ee8136847e 219 /* Notification requires cccd */
Rohit Grover 22:c6ee8136847e 220 memclr_( &cccd_md, sizeof(ble_gatts_attr_md_t));
Rohit Grover 22:c6ee8136847e 221 cccd_md.vloc = BLE_GATTS_VLOC_STACK;
Rohit Grover 22:c6ee8136847e 222 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
Rohit Grover 22:c6ee8136847e 223 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);
Rohit Grover 22:c6ee8136847e 224 }
Rohit Grover 22:c6ee8136847e 225
Rohit Grover 22:c6ee8136847e 226 ble_gatts_char_md_t char_md = {0};
Rohit Grover 22:c6ee8136847e 227
Rohit Grover 22:c6ee8136847e 228 char_md.char_props = char_props;
Rohit Grover 22:c6ee8136847e 229 char_md.p_cccd_md =
Rohit Grover 22:c6ee8136847e 230 (char_props.notify || char_props.indicate) ? &cccd_md : NULL;
rgrover1 119:3ba3e377b972 231 if ((userDescriptionDescriptorValueLen > 0) && (userDescriptionDescriptorValuePtr != NULL)) {
rgrover1 119:3ba3e377b972 232 char_md.p_char_user_desc = const_cast<uint8_t *>(userDescriptionDescriptorValuePtr);
rgrover1 119:3ba3e377b972 233 char_md.char_user_desc_max_size = userDescriptionDescriptorValueLen;
rgrover1 119:3ba3e377b972 234 char_md.char_user_desc_size = userDescriptionDescriptorValueLen;
rgrover1 119:3ba3e377b972 235 }
Rohit Grover 22:c6ee8136847e 236
Rohit Grover 22:c6ee8136847e 237 /* Attribute declaration */
rgrover1 84:658e5ec772a1 238 ble_gatts_attr_md_t attr_md = {0};
rgrover1 84:658e5ec772a1 239
rgrover1 84:658e5ec772a1 240 attr_md.rd_auth = readAuthorization;
rgrover1 84:658e5ec772a1 241 attr_md.wr_auth = writeAuthorization;
Rohit Grover 22:c6ee8136847e 242
Rohit Grover 22:c6ee8136847e 243 attr_md.vloc = BLE_GATTS_VLOC_STACK;
Rohit Grover 22:c6ee8136847e 244 attr_md.vlen = (min_length == max_length) ? 0 : 1;
Rohit Grover 22:c6ee8136847e 245
Rohit Grover 22:c6ee8136847e 246 if (char_props.read || char_props.notify || char_props.indicate) {
Rohit Grover 22:c6ee8136847e 247 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
Rohit Grover 22:c6ee8136847e 248 }
Rohit Grover 22:c6ee8136847e 249
marcuschang 85:17fe69405098 250 if (char_props.write || char_props.write_wo_resp) {
Rohit Grover 22:c6ee8136847e 251 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);
Rohit Grover 22:c6ee8136847e 252 }
Rohit Grover 22:c6ee8136847e 253
Rohit Grover 22:c6ee8136847e 254 ble_gatts_attr_t attr_char_value = {0};
Rohit Grover 22:c6ee8136847e 255
Rohit Grover 22:c6ee8136847e 256 attr_char_value.p_uuid = p_uuid;
Rohit Grover 22:c6ee8136847e 257 attr_char_value.p_attr_md = &attr_md;
Rohit Grover 22:c6ee8136847e 258 attr_char_value.init_len = min_length;
Rohit Grover 22:c6ee8136847e 259 attr_char_value.max_len = max_length;
Rohit Grover 22:c6ee8136847e 260 attr_char_value.p_value = p_data;
Rohit Grover 22:c6ee8136847e 261
Rohit Grover 22:c6ee8136847e 262 ASSERT_STATUS ( sd_ble_gatts_characteristic_add(service_handle,
Rohit Grover 22:c6ee8136847e 263 &char_md,
Rohit Grover 22:c6ee8136847e 264 &attr_char_value,
Rohit Grover 22:c6ee8136847e 265 p_char_handle));
Rohit Grover 22:c6ee8136847e 266
Rohit Grover 22:c6ee8136847e 267 return ERROR_NONE;
Rohit Grover 22:c6ee8136847e 268 }
Rohit Grover 59:2819e564b613 269
Rohit Grover 59:2819e564b613 270
Rohit Grover 59:2819e564b613 271
Rohit Grover 59:2819e564b613 272 /**************************************************************************/
Rohit Grover 59:2819e564b613 273 /*!
Rohit Grover 59:2819e564b613 274 @brief Adds a new descriptor to the custom service, assigning
Rohit Grover 59:2819e564b613 275 value, a UUID add-on value, etc.
Rohit Grover 59:2819e564b613 276
Rohit Grover 59:2819e564b613 277 @param[in] char_handle
Rohit Grover 59:2819e564b613 278 @param[in] p_uuid The 16-bit value to add to the base UUID
Rohit Grover 59:2819e564b613 279 for this descriptor (normally >1
Rohit Grover 59:2819e564b613 280 since 1 is typically used by the primary
Rohit Grover 59:2819e564b613 281 service).
Rohit Grover 59:2819e564b613 282 @param[in] max_length The maximum length of this descriptor
Rohit Grover 59:2819e564b613 283
Rohit Grover 59:2819e564b613 284 @returns
Rohit Grover 59:2819e564b613 285 @retval ERROR_NONE Everything executed normally
Rohit Grover 59:2819e564b613 286 */
Rohit Grover 59:2819e564b613 287 /**************************************************************************/
Rohit Grover 59:2819e564b613 288 error_t custom_add_in_descriptor(uint16_t char_handle,
Rohit Grover 59:2819e564b613 289 ble_uuid_t *p_uuid,
Rohit Grover 59:2819e564b613 290 uint8_t *p_data,
Rohit Grover 59:2819e564b613 291 uint16_t min_length,
Rohit Grover 59:2819e564b613 292 uint16_t max_length,
Rohit Grover 59:2819e564b613 293 uint16_t *p_desc_handle)
Rohit Grover 59:2819e564b613 294 {
Rohit Grover 59:2819e564b613 295 /* Descriptor metadata */
Rohit Grover 59:2819e564b613 296 ble_gatts_attr_md_t desc_md = {0};
Rohit Grover 59:2819e564b613 297
Rohit Grover 59:2819e564b613 298 desc_md.vloc = BLE_GATTS_VLOC_STACK;
Rohit Grover 59:2819e564b613 299 desc_md.vlen = (min_length == max_length) ? 0 : 1;
Rohit Grover 59:2819e564b613 300
Rohit Grover 59:2819e564b613 301 /* Make it readable and writable */
Rohit Grover 59:2819e564b613 302 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&desc_md.read_perm);
Rohit Grover 59:2819e564b613 303 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&desc_md.write_perm);
Rohit Grover 59:2819e564b613 304
Rohit Grover 59:2819e564b613 305 ble_gatts_attr_t attr_desc = {0};
Rohit Grover 59:2819e564b613 306
Rohit Grover 59:2819e564b613 307 attr_desc.p_uuid = p_uuid;
Rohit Grover 59:2819e564b613 308 attr_desc.p_attr_md = &desc_md;
Rohit Grover 59:2819e564b613 309 attr_desc.init_len = min_length;
Rohit Grover 59:2819e564b613 310 attr_desc.max_len = max_length;
Rohit Grover 59:2819e564b613 311 attr_desc.p_value = p_data;
Rohit Grover 59:2819e564b613 312
Rohit Grover 59:2819e564b613 313 ASSERT_STATUS ( sd_ble_gatts_descriptor_add(char_handle,
Rohit Grover 59:2819e564b613 314 &attr_desc,
Rohit Grover 59:2819e564b613 315 p_desc_handle));
Rohit Grover 59:2819e564b613 316
Rohit Grover 59:2819e564b613 317 return ERROR_NONE;
rgrover1 82:6c51cbe4bc12 318 }