Martin Cottrell / nRF51822

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Dependencies:   nrf51-sdk

Dependents:   microbit-dal

Fork of nRF51822 by Lancaster University

btle/custom/custom_helper.cpp@10:68c0e6cabe07, 2014-05-29 (annotated)

Committer:
Rohit Grover
Date:
Thu May 29 08:07:04 2014 +0100
Revision:
10:68c0e6cabe07
Parent:
9:3794dc9540f0
Child:
12:e151f55035b8
add a functional UUID cache

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:eff01767de02 1 /* mbed Microcontroller Library
bogdanm 0:eff01767de02 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:eff01767de02 3 *
bogdanm 0:eff01767de02 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:eff01767de02 5 * you may not use this file except in compliance with the License.
bogdanm 0:eff01767de02 6 * You may obtain a copy of the License at
bogdanm 0:eff01767de02 7 *
bogdanm 0:eff01767de02 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:eff01767de02 9 *
bogdanm 0:eff01767de02 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:eff01767de02 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:eff01767de02 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:eff01767de02 13 * See the License for the specific language governing permissions and
bogdanm 0:eff01767de02 14 * limitations under the License.
bogdanm 0:eff01767de02 15 */
bogdanm 0:eff01767de02 16
bogdanm 0:eff01767de02 17 #include "custom_helper.h"
bogdanm 0:eff01767de02 18
Rohit Grover 8:2214f1df6a6a 19 /**
Rohit Grover 10:68c0e6cabe07 20 * Types and data structures involved in maintaining a local cache of 128-bit
Rohit Grover 10:68c0e6cabe07 21 * UUIDs which have been added to the nRF using SVC calls previously.
Rohit Grover 10:68c0e6cabe07 22 */
Rohit Grover 10:68c0e6cabe07 23 typedef struct {
Rohit Grover 10:68c0e6cabe07 24 uint8_t uuid[UUID::LENGTH_OF_LONG_UUID];
Rohit Grover 10:68c0e6cabe07 25 uint8_t type;
Rohit Grover 10:68c0e6cabe07 26 } converted_uuid_table_entry_t;
Rohit Grover 10:68c0e6cabe07 27 static const unsigned UUID_TABLE_MAX_ENTRIES = 8; /* This is the maximum number
Rohit Grover 10:68c0e6cabe07 28 * of 128-bit UUIDs with distinct bases that
Rohit Grover 10:68c0e6cabe07 29 * we expect to be in use; increase this
Rohit Grover 10:68c0e6cabe07 30 * limit if needed. */
Rohit Grover 10:68c0e6cabe07 31 static unsigned uuidTableEntries = 0; /* current usage of the table */
Rohit Grover 10:68c0e6cabe07 32 converted_uuid_table_entry_t convertedUUIDTable[UUID_TABLE_MAX_ENTRIES];
Rohit Grover 10:68c0e6cabe07 33
Rohit Grover 10:68c0e6cabe07 34 /**
Rohit Grover 9:3794dc9540f0 35 * lookup the cache of previously converted 128-bit UUIDs to find a type value.
Rohit Grover 9:3794dc9540f0 36 * @param uuid long UUID
Rohit Grover 9:3794dc9540f0 37 * @param recoveredType the type field of the 3-byte nRF's uuid.
Rohit Grover 9:3794dc9540f0 38 * @return true if a match is found.
Rohit Grover 9:3794dc9540f0 39 */
Rohit Grover 9:3794dc9540f0 40 static bool
Rohit Grover 9:3794dc9540f0 41 lookupConvertedUUIDTable(const uint8_t uuid[UUID::LENGTH_OF_LONG_UUID],
Rohit Grover 10:68c0e6cabe07 42 uint8_t *recoveredType)
Rohit Grover 9:3794dc9540f0 43 {
Rohit Grover 10:68c0e6cabe07 44 unsigned i;
Rohit Grover 10:68c0e6cabe07 45 for (i = 0; i < uuidTableEntries; i++) {
Rohit Grover 10:68c0e6cabe07 46 if (memcmp(convertedUUIDTable[i].uuid,
Rohit Grover 10:68c0e6cabe07 47 uuid,
Rohit Grover 10:68c0e6cabe07 48 UUID::LENGTH_OF_LONG_UUID) == 0) {
Rohit Grover 10:68c0e6cabe07 49 *recoveredType = convertedUUIDTable[i].type;
Rohit Grover 10:68c0e6cabe07 50 return true;
Rohit Grover 10:68c0e6cabe07 51 }
Rohit Grover 10:68c0e6cabe07 52 }
Rohit Grover 10:68c0e6cabe07 53
Rohit Grover 9:3794dc9540f0 54 return false;
Rohit Grover 9:3794dc9540f0 55 }
Rohit Grover 9:3794dc9540f0 56
Rohit Grover 9:3794dc9540f0 57 static void
Rohit Grover 9:3794dc9540f0 58 addToConvertedUUIDTable(const uint8_t uuid[UUID::LENGTH_OF_LONG_UUID],
Rohit Grover 10:68c0e6cabe07 59 uint8_t type)
Rohit Grover 9:3794dc9540f0 60 {
Rohit Grover 10:68c0e6cabe07 61 if (uuidTableEntries == UUID_TABLE_MAX_ENTRIES) {
Rohit Grover 10:68c0e6cabe07 62 return; /* recovery needed; or at least the user should be
Rohit Grover 10:68c0e6cabe07 63 * warned about this fact.*/
Rohit Grover 10:68c0e6cabe07 64 }
Rohit Grover 10:68c0e6cabe07 65
Rohit Grover 10:68c0e6cabe07 66 memcpy(convertedUUIDTable[uuidTableEntries].uuid,
Rohit Grover 10:68c0e6cabe07 67 uuid,
Rohit Grover 10:68c0e6cabe07 68 UUID::LENGTH_OF_LONG_UUID);
Rohit Grover 10:68c0e6cabe07 69 convertedUUIDTable[uuidTableEntries].type = type;
Rohit Grover 10:68c0e6cabe07 70 uuidTableEntries++;
Rohit Grover 9:3794dc9540f0 71 }
Rohit Grover 9:3794dc9540f0 72
Rohit Grover 9:3794dc9540f0 73 /**
Rohit Grover 8:2214f1df6a6a 74 * The nRF transport has its own 3-byte representation of a UUID. If the user-
Rohit Grover 8:2214f1df6a6a 75 * specified UUID is 128-bits wide, then the UUID base needs to be added to the
Rohit Grover 8:2214f1df6a6a 76 * soft-device and converted to a 3-byte handle before being used further. This
Rohit Grover 8:2214f1df6a6a 77 * function is responsible for this translation of user-specified UUIDs into
Rohit Grover 8:2214f1df6a6a 78 * nRF's representation.
Rohit Grover 8:2214f1df6a6a 79 *
Rohit Grover 8:2214f1df6a6a 80 * @param[in] uuid
Rohit Grover 8:2214f1df6a6a 81 * user-specified UUID
Rohit Grover 8:2214f1df6a6a 82 * @return nRF
Rohit Grover 8:2214f1df6a6a 83 * 3-byte UUID (containing a type and 16-bit UUID) representation
Rohit Grover 8:2214f1df6a6a 84 * to be used with SVC calls.
Rohit Grover 8:2214f1df6a6a 85 */
Rohit Grover 8:2214f1df6a6a 86 ble_uuid_t custom_convert_to_transport_uuid(const UUID &uuid)
Rohit Grover 8:2214f1df6a6a 87 {
Rohit Grover 10:68c0e6cabe07 88 ble_uuid_t nordicUUID = {
Rohit Grover 8:2214f1df6a6a 89 .uuid = uuid.value,
Rohit Grover 8:2214f1df6a6a 90 .type = BLE_UUID_TYPE_UNKNOWN /* to be set below */
Rohit Grover 8:2214f1df6a6a 91 };
Rohit Grover 8:2214f1df6a6a 92
Rohit Grover 8:2214f1df6a6a 93 if (uuid.type == UUID::UUID_TYPE_SHORT) {
Rohit Grover 10:68c0e6cabe07 94 nordicUUID.type = BLE_UUID_TYPE_BLE;
Rohit Grover 8:2214f1df6a6a 95 } else {
Rohit Grover 10:68c0e6cabe07 96 if (!lookupConvertedUUIDTable(uuid.base, &nordicUUID.type)) {
Rohit Grover 10:68c0e6cabe07 97 nordicUUID.type = custom_add_uuid_base(uuid.base);
Rohit Grover 10:68c0e6cabe07 98 addToConvertedUUIDTable(uuid.base, nordicUUID.type);
Rohit Grover 9:3794dc9540f0 99 }
Rohit Grover 8:2214f1df6a6a 100 }
Rohit Grover 8:2214f1df6a6a 101
Rohit Grover 10:68c0e6cabe07 102 return nordicUUID;
Rohit Grover 8:2214f1df6a6a 103 }
Rohit Grover 8:2214f1df6a6a 104
bogdanm 0:eff01767de02 105 /**************************************************************************/
bogdanm 0:eff01767de02 106 /*!
bogdanm 0:eff01767de02 107 @brief Adds the base UUID to the custom service. All UUIDs used
bogdanm 0:eff01767de02 108 by this service are based on this 128-bit UUID.
Rohit Grover 6:bbb4357dc135 109
bogdanm 0:eff01767de02 110 @note This UUID needs to be added to the SoftDevice stack before
bogdanm 0:eff01767de02 111 adding the service's primary service via
bogdanm 0:eff01767de02 112 'sd_ble_gatts_service_add'
bogdanm 0:eff01767de02 113
bogdanm 0:eff01767de02 114 @param[in] p_uuid_base A pointer to the 128-bit UUID array (8*16)
Rohit Grover 6:bbb4357dc135 115
bogdanm 0:eff01767de02 116 @returns The UUID type.
bogdanm 0:eff01767de02 117 A return value of 0 should be considered an error.
Rohit Grover 6:bbb4357dc135 118
bogdanm 0:eff01767de02 119 @retval 0x00 BLE_UUID_TYPE_UNKNOWN
bogdanm 0:eff01767de02 120 @retval 0x01 BLE_UUID_TYPE_BLE
bogdanm 0:eff01767de02 121 @retval 0x02 BLE_UUID_TYPE_VENDOR_BEGIN
Rohit Grover 6:bbb4357dc135 122
bogdanm 0:eff01767de02 123 @section EXAMPLE
bogdanm 0:eff01767de02 124 @code
bogdanm 0:eff01767de02 125
bogdanm 0:eff01767de02 126 // Take note that bytes 2/3 are blank since these are used to identify
bogdanm 0:eff01767de02 127 // the primary service and individual characteristics
bogdanm 0:eff01767de02 128 #define CFG_CUSTOM_UUID_BASE "\x6E\x40\x00\x00\xB5\xA3\xF3\x93\xE0\xA9\xE5\x0E\x24\xDC\xCA\x9E"
Rohit Grover 6:bbb4357dc135 129
bogdanm 0:eff01767de02 130 uint8_t uuid_type = custom_add_uuid_base(CFG_CUSTOM_UUID_BASE);
bogdanm 0:eff01767de02 131 ASSERT(uuid_type > 0, ERROR_NOT_FOUND);
Rohit Grover 6:bbb4357dc135 132
bogdanm 0:eff01767de02 133 // We can now safely add the primary service and any characteristics
bogdanm 0:eff01767de02 134 // for our custom service ...
Rohit Grover 6:bbb4357dc135 135
bogdanm 0:eff01767de02 136 @endcode
bogdanm 0:eff01767de02 137 */
bogdanm 0:eff01767de02 138 /**************************************************************************/
Rohit Grover 6:bbb4357dc135 139 uint8_t custom_add_uuid_base(uint8_t const *const p_uuid_base)
bogdanm 0:eff01767de02 140 {
Rohit Grover 6:bbb4357dc135 141 ble_uuid128_t base_uuid;
Rohit Grover 6:bbb4357dc135 142 uint8_t uuid_type = 0;
bogdanm 0:eff01767de02 143
Rohit Grover 6:bbb4357dc135 144 /* Reverse the bytes since ble_uuid128_t is LSB */
Rohit Grover 6:bbb4357dc135 145 for (uint8_t i = 0; i<16; i++) {
Rohit Grover 6:bbb4357dc135 146 base_uuid.uuid128[i] = p_uuid_base[15 - i];
Rohit Grover 6:bbb4357dc135 147 }
bogdanm 0:eff01767de02 148
Rohit Grover 6:bbb4357dc135 149 ASSERT_INT( ERROR_NONE, sd_ble_uuid_vs_add( &base_uuid, &uuid_type ), 0);
bogdanm 0:eff01767de02 150
Rohit Grover 6:bbb4357dc135 151 return uuid_type;
bogdanm 0:eff01767de02 152 }
bogdanm 0:eff01767de02 153
bogdanm 0:eff01767de02 154 /**************************************************************************/
bogdanm 0:eff01767de02 155 /*!
bogdanm 0:eff01767de02 156
bogdanm 0:eff01767de02 157 */
bogdanm 0:eff01767de02 158 /**************************************************************************/
Rohit Grover 6:bbb4357dc135 159 error_t custom_decode_uuid_base(uint8_t const *const p_uuid_base,
Rohit Grover 6:bbb4357dc135 160 ble_uuid_t *p_uuid)
bogdanm 0:eff01767de02 161 {
Rohit Grover 6:bbb4357dc135 162 uint8_t uuid_base_le[16];
bogdanm 0:eff01767de02 163
Rohit Grover 6:bbb4357dc135 164 /* Reverse the bytes since ble_uuid128_t is LSB */
Rohit Grover 6:bbb4357dc135 165 for (uint8_t i = 0; i<16; i++) {
Rohit Grover 6:bbb4357dc135 166 uuid_base_le[i] = p_uuid_base[15 - i];
Rohit Grover 6:bbb4357dc135 167 }
bogdanm 0:eff01767de02 168
Rohit Grover 6:bbb4357dc135 169 ASSERT_STATUS( sd_ble_uuid_decode(16, uuid_base_le, p_uuid));
bogdanm 0:eff01767de02 170
Rohit Grover 6:bbb4357dc135 171 return ERROR_NONE;
bogdanm 0:eff01767de02 172 }
bogdanm 0:eff01767de02 173
bogdanm 0:eff01767de02 174 /**************************************************************************/
bogdanm 0:eff01767de02 175 /*!
bogdanm 0:eff01767de02 176 @brief Adds a new characteristic to the custom service, assigning
bogdanm 0:eff01767de02 177 properties, a UUID add-on value, etc.
bogdanm 0:eff01767de02 178
bogdanm 0:eff01767de02 179 @param[in] service_handle
bogdanm 0:eff01767de02 180 @param[in] p_uuid The 16-bit value to add to the base UUID
bogdanm 0:eff01767de02 181 for this characteristic (normally >1
bogdanm 0:eff01767de02 182 since 1 is typically used by the primary
bogdanm 0:eff01767de02 183 service).
bogdanm 0:eff01767de02 184 @param[in] char_props The characteristic properties, as
bogdanm 0:eff01767de02 185 defined by ble_gatt_char_props_t
bogdanm 0:eff01767de02 186 @param[in] max_length The maximum length of this characeristic
bogdanm 0:eff01767de02 187 @param[in] p_char_handle
Rohit Grover 6:bbb4357dc135 188
bogdanm 0:eff01767de02 189 @returns
bogdanm 0:eff01767de02 190 @retval ERROR_NONE Everything executed normally
bogdanm 0:eff01767de02 191 */
bogdanm 0:eff01767de02 192 /**************************************************************************/
Rohit Grover 6:bbb4357dc135 193 error_t custom_add_in_characteristic(uint16_t service_handle,
Rohit Grover 6:bbb4357dc135 194 ble_uuid_t *p_uuid,
Rohit Grover 6:bbb4357dc135 195 uint8_t properties,
Rohit Grover 6:bbb4357dc135 196 uint8_t *p_data,
Rohit Grover 6:bbb4357dc135 197 uint16_t min_length,
Rohit Grover 6:bbb4357dc135 198 uint16_t max_length,
Rohit Grover 6:bbb4357dc135 199 ble_gatts_char_handles_t *p_char_handle)
bogdanm 0:eff01767de02 200 {
Rohit Grover 6:bbb4357dc135 201 /* Characteristic metadata */
Rohit Grover 6:bbb4357dc135 202 ble_gatts_attr_md_t cccd_md;
Rohit Grover 6:bbb4357dc135 203 ble_gatt_char_props_t char_props;
bogdanm 0:eff01767de02 204
Rohit Grover 6:bbb4357dc135 205 memcpy(&char_props, &properties, 1);
bogdanm 0:eff01767de02 206
Rohit Grover 6:bbb4357dc135 207 if (char_props.notify || char_props.indicate) {
Rohit Grover 6:bbb4357dc135 208 /* Notification requires cccd */
Rohit Grover 6:bbb4357dc135 209 memclr_( &cccd_md, sizeof(ble_gatts_attr_md_t));
Rohit Grover 6:bbb4357dc135 210 cccd_md.vloc = BLE_GATTS_VLOC_STACK;
Rohit Grover 6:bbb4357dc135 211 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
Rohit Grover 6:bbb4357dc135 212 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);
Rohit Grover 6:bbb4357dc135 213 }
bogdanm 0:eff01767de02 214
Rohit Grover 6:bbb4357dc135 215 ble_gatts_char_md_t char_md = {0};
bogdanm 0:eff01767de02 216
Rohit Grover 6:bbb4357dc135 217 char_md.char_props = char_props;
Rohit Grover 6:bbb4357dc135 218 char_md.p_cccd_md =
Rohit Grover 6:bbb4357dc135 219 (char_props.notify || char_props.indicate) ? &cccd_md : NULL;
bogdanm 0:eff01767de02 220
Rohit Grover 6:bbb4357dc135 221 /* Attribute declaration */
Rohit Grover 6:bbb4357dc135 222 ble_gatts_attr_md_t attr_md = {0};
bogdanm 0:eff01767de02 223
Rohit Grover 6:bbb4357dc135 224 attr_md.vloc = BLE_GATTS_VLOC_STACK;
Rohit Grover 6:bbb4357dc135 225 attr_md.vlen = (min_length == max_length) ? 0 : 1;
bogdanm 0:eff01767de02 226
Rohit Grover 6:bbb4357dc135 227 if (char_props.read || char_props.notify || char_props.indicate) {
Rohit Grover 6:bbb4357dc135 228 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
Rohit Grover 6:bbb4357dc135 229 }
Rohit Grover 6:bbb4357dc135 230
Rohit Grover 6:bbb4357dc135 231 if (char_props.write) {
Rohit Grover 6:bbb4357dc135 232 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);
Rohit Grover 6:bbb4357dc135 233 }
bogdanm 0:eff01767de02 234
Rohit Grover 6:bbb4357dc135 235 ble_gatts_attr_t attr_char_value = {0};
bogdanm 0:eff01767de02 236
Rohit Grover 6:bbb4357dc135 237 attr_char_value.p_uuid = p_uuid;
Rohit Grover 6:bbb4357dc135 238 attr_char_value.p_attr_md = &attr_md;
Rohit Grover 6:bbb4357dc135 239 attr_char_value.init_len = min_length;
Rohit Grover 6:bbb4357dc135 240 attr_char_value.max_len = max_length;
Rohit Grover 6:bbb4357dc135 241 attr_char_value.p_value = p_data;
bogdanm 0:eff01767de02 242
bogdanm 0:eff01767de02 243
Rohit Grover 6:bbb4357dc135 244 ASSERT_STATUS ( sd_ble_gatts_characteristic_add(service_handle,
Rohit Grover 6:bbb4357dc135 245 &char_md,
Rohit Grover 6:bbb4357dc135 246 &attr_char_value,
Rohit Grover 6:bbb4357dc135 247 p_char_handle));
bogdanm 0:eff01767de02 248
Rohit Grover 6:bbb4357dc135 249 return ERROR_NONE;
bogdanm 0:eff01767de02 250 }