GGTA team / nRF51822

Nordic stack and drivers for the mbed BLE API

Fork of nRF51822 by Nordic Semiconductor

btle/custom/custom_helper.cpp@9:3794dc9540f0, 2014-05-28 (annotated)

Committer:
Rohit Grover
Date:
Wed May 28 17:46:58 2014 +0100
Revision:
9:3794dc9540f0
Parent:
8:2214f1df6a6a
Child:
10:68c0e6cabe07
add skeleton for converted table for 128-bit UUIDs

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 9:3794dc9540f0 20 * lookup the cache of previously converted 128-bit UUIDs to find a type value.
Rohit Grover 9:3794dc9540f0 21 * @param uuid long UUID
Rohit Grover 9:3794dc9540f0 22 * @param recoveredType the type field of the 3-byte nRF's uuid.
Rohit Grover 9:3794dc9540f0 23 * @return true if a match is found.
Rohit Grover 9:3794dc9540f0 24 */
Rohit Grover 9:3794dc9540f0 25 static bool
Rohit Grover 9:3794dc9540f0 26 lookupConvertedUUIDTable(const uint8_t uuid[UUID::LENGTH_OF_LONG_UUID],
Rohit Grover 9:3794dc9540f0 27 uint8_t *recoveredType)
Rohit Grover 9:3794dc9540f0 28 {
Rohit Grover 9:3794dc9540f0 29 return false;
Rohit Grover 9:3794dc9540f0 30 }
Rohit Grover 9:3794dc9540f0 31
Rohit Grover 9:3794dc9540f0 32 static void
Rohit Grover 9:3794dc9540f0 33 addToConvertedUUIDTable(const uint8_t uuid[UUID::LENGTH_OF_LONG_UUID],
Rohit Grover 9:3794dc9540f0 34 uint8_t recoveredType)
Rohit Grover 9:3794dc9540f0 35 {
Rohit Grover 9:3794dc9540f0 36 /* empty for now */
Rohit Grover 9:3794dc9540f0 37 }
Rohit Grover 9:3794dc9540f0 38
Rohit Grover 9:3794dc9540f0 39 /**
Rohit Grover 8:2214f1df6a6a 40 * The nRF transport has its own 3-byte representation of a UUID. If the user-
Rohit Grover 8:2214f1df6a6a 41 * specified UUID is 128-bits wide, then the UUID base needs to be added to the
Rohit Grover 8:2214f1df6a6a 42 * soft-device and converted to a 3-byte handle before being used further. This
Rohit Grover 8:2214f1df6a6a 43 * function is responsible for this translation of user-specified UUIDs into
Rohit Grover 8:2214f1df6a6a 44 * nRF's representation.
Rohit Grover 8:2214f1df6a6a 45 *
Rohit Grover 8:2214f1df6a6a 46 * @param[in] uuid
Rohit Grover 8:2214f1df6a6a 47 * user-specified UUID
Rohit Grover 8:2214f1df6a6a 48 * @return nRF
Rohit Grover 8:2214f1df6a6a 49 * 3-byte UUID (containing a type and 16-bit UUID) representation
Rohit Grover 8:2214f1df6a6a 50 * to be used with SVC calls.
Rohit Grover 8:2214f1df6a6a 51 */
Rohit Grover 8:2214f1df6a6a 52 ble_uuid_t custom_convert_to_transport_uuid(const UUID &uuid)
Rohit Grover 8:2214f1df6a6a 53 {
Rohit Grover 8:2214f1df6a6a 54 ble_uuid_t transportUUID = {
Rohit Grover 8:2214f1df6a6a 55 .uuid = uuid.value,
Rohit Grover 8:2214f1df6a6a 56 .type = BLE_UUID_TYPE_UNKNOWN /* to be set below */
Rohit Grover 8:2214f1df6a6a 57 };
Rohit Grover 8:2214f1df6a6a 58
Rohit Grover 8:2214f1df6a6a 59 if (uuid.type == UUID::UUID_TYPE_SHORT) {
Rohit Grover 8:2214f1df6a6a 60 transportUUID.type = BLE_UUID_TYPE_BLE;
Rohit Grover 8:2214f1df6a6a 61 } else {
Rohit Grover 9:3794dc9540f0 62 if (!lookupConvertedUUIDTable(uuid.base, &transportUUID.type)) {
Rohit Grover 9:3794dc9540f0 63 transportUUID.type = custom_add_uuid_base(uuid.base);
Rohit Grover 9:3794dc9540f0 64 addToConvertedUUIDTable(uuid.base, transportUUID.type);
Rohit Grover 9:3794dc9540f0 65 }
Rohit Grover 8:2214f1df6a6a 66 }
Rohit Grover 8:2214f1df6a6a 67
Rohit Grover 8:2214f1df6a6a 68 return transportUUID;
Rohit Grover 8:2214f1df6a6a 69 }
Rohit Grover 8:2214f1df6a6a 70
bogdanm 0:eff01767de02 71 /**************************************************************************/
bogdanm 0:eff01767de02 72 /*!
bogdanm 0:eff01767de02 73 @brief Adds the base UUID to the custom service. All UUIDs used
bogdanm 0:eff01767de02 74 by this service are based on this 128-bit UUID.
Rohit Grover 6:bbb4357dc135 75
bogdanm 0:eff01767de02 76 @note This UUID needs to be added to the SoftDevice stack before
bogdanm 0:eff01767de02 77 adding the service's primary service via
bogdanm 0:eff01767de02 78 'sd_ble_gatts_service_add'
bogdanm 0:eff01767de02 79
bogdanm 0:eff01767de02 80 @param[in] p_uuid_base A pointer to the 128-bit UUID array (8*16)
Rohit Grover 6:bbb4357dc135 81
bogdanm 0:eff01767de02 82 @returns The UUID type.
bogdanm 0:eff01767de02 83 A return value of 0 should be considered an error.
Rohit Grover 6:bbb4357dc135 84
bogdanm 0:eff01767de02 85 @retval 0x00 BLE_UUID_TYPE_UNKNOWN
bogdanm 0:eff01767de02 86 @retval 0x01 BLE_UUID_TYPE_BLE
bogdanm 0:eff01767de02 87 @retval 0x02 BLE_UUID_TYPE_VENDOR_BEGIN
Rohit Grover 6:bbb4357dc135 88
bogdanm 0:eff01767de02 89 @section EXAMPLE
bogdanm 0:eff01767de02 90 @code
bogdanm 0:eff01767de02 91
bogdanm 0:eff01767de02 92 // Take note that bytes 2/3 are blank since these are used to identify
bogdanm 0:eff01767de02 93 // the primary service and individual characteristics
bogdanm 0:eff01767de02 94 #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 95
bogdanm 0:eff01767de02 96 uint8_t uuid_type = custom_add_uuid_base(CFG_CUSTOM_UUID_BASE);
bogdanm 0:eff01767de02 97 ASSERT(uuid_type > 0, ERROR_NOT_FOUND);
Rohit Grover 6:bbb4357dc135 98
bogdanm 0:eff01767de02 99 // We can now safely add the primary service and any characteristics
bogdanm 0:eff01767de02 100 // for our custom service ...
Rohit Grover 6:bbb4357dc135 101
bogdanm 0:eff01767de02 102 @endcode
bogdanm 0:eff01767de02 103 */
bogdanm 0:eff01767de02 104 /**************************************************************************/
Rohit Grover 6:bbb4357dc135 105 uint8_t custom_add_uuid_base(uint8_t const *const p_uuid_base)
bogdanm 0:eff01767de02 106 {
Rohit Grover 6:bbb4357dc135 107 ble_uuid128_t base_uuid;
Rohit Grover 6:bbb4357dc135 108 uint8_t uuid_type = 0;
bogdanm 0:eff01767de02 109
Rohit Grover 6:bbb4357dc135 110 /* Reverse the bytes since ble_uuid128_t is LSB */
Rohit Grover 6:bbb4357dc135 111 for (uint8_t i = 0; i<16; i++) {
Rohit Grover 6:bbb4357dc135 112 base_uuid.uuid128[i] = p_uuid_base[15 - i];
Rohit Grover 6:bbb4357dc135 113 }
bogdanm 0:eff01767de02 114
Rohit Grover 6:bbb4357dc135 115 ASSERT_INT( ERROR_NONE, sd_ble_uuid_vs_add( &base_uuid, &uuid_type ), 0);
bogdanm 0:eff01767de02 116
Rohit Grover 6:bbb4357dc135 117 return uuid_type;
bogdanm 0:eff01767de02 118 }
bogdanm 0:eff01767de02 119
bogdanm 0:eff01767de02 120 /**************************************************************************/
bogdanm 0:eff01767de02 121 /*!
bogdanm 0:eff01767de02 122
bogdanm 0:eff01767de02 123 */
bogdanm 0:eff01767de02 124 /**************************************************************************/
Rohit Grover 6:bbb4357dc135 125 error_t custom_decode_uuid_base(uint8_t const *const p_uuid_base,
Rohit Grover 6:bbb4357dc135 126 ble_uuid_t *p_uuid)
bogdanm 0:eff01767de02 127 {
Rohit Grover 6:bbb4357dc135 128 uint8_t uuid_base_le[16];
bogdanm 0:eff01767de02 129
Rohit Grover 6:bbb4357dc135 130 /* Reverse the bytes since ble_uuid128_t is LSB */
Rohit Grover 6:bbb4357dc135 131 for (uint8_t i = 0; i<16; i++) {
Rohit Grover 6:bbb4357dc135 132 uuid_base_le[i] = p_uuid_base[15 - i];
Rohit Grover 6:bbb4357dc135 133 }
bogdanm 0:eff01767de02 134
Rohit Grover 6:bbb4357dc135 135 ASSERT_STATUS( sd_ble_uuid_decode(16, uuid_base_le, p_uuid));
bogdanm 0:eff01767de02 136
Rohit Grover 6:bbb4357dc135 137 return ERROR_NONE;
bogdanm 0:eff01767de02 138 }
bogdanm 0:eff01767de02 139
bogdanm 0:eff01767de02 140 /**************************************************************************/
bogdanm 0:eff01767de02 141 /*!
bogdanm 0:eff01767de02 142 @brief Adds a new characteristic to the custom service, assigning
bogdanm 0:eff01767de02 143 properties, a UUID add-on value, etc.
bogdanm 0:eff01767de02 144
bogdanm 0:eff01767de02 145 @param[in] service_handle
bogdanm 0:eff01767de02 146 @param[in] p_uuid The 16-bit value to add to the base UUID
bogdanm 0:eff01767de02 147 for this characteristic (normally >1
bogdanm 0:eff01767de02 148 since 1 is typically used by the primary
bogdanm 0:eff01767de02 149 service).
bogdanm 0:eff01767de02 150 @param[in] char_props The characteristic properties, as
bogdanm 0:eff01767de02 151 defined by ble_gatt_char_props_t
bogdanm 0:eff01767de02 152 @param[in] max_length The maximum length of this characeristic
bogdanm 0:eff01767de02 153 @param[in] p_char_handle
Rohit Grover 6:bbb4357dc135 154
bogdanm 0:eff01767de02 155 @returns
bogdanm 0:eff01767de02 156 @retval ERROR_NONE Everything executed normally
bogdanm 0:eff01767de02 157 */
bogdanm 0:eff01767de02 158 /**************************************************************************/
Rohit Grover 6:bbb4357dc135 159 error_t custom_add_in_characteristic(uint16_t service_handle,
Rohit Grover 6:bbb4357dc135 160 ble_uuid_t *p_uuid,
Rohit Grover 6:bbb4357dc135 161 uint8_t properties,
Rohit Grover 6:bbb4357dc135 162 uint8_t *p_data,
Rohit Grover 6:bbb4357dc135 163 uint16_t min_length,
Rohit Grover 6:bbb4357dc135 164 uint16_t max_length,
Rohit Grover 6:bbb4357dc135 165 ble_gatts_char_handles_t *p_char_handle)
bogdanm 0:eff01767de02 166 {
Rohit Grover 6:bbb4357dc135 167 /* Characteristic metadata */
Rohit Grover 6:bbb4357dc135 168 ble_gatts_attr_md_t cccd_md;
Rohit Grover 6:bbb4357dc135 169 ble_gatt_char_props_t char_props;
bogdanm 0:eff01767de02 170
Rohit Grover 6:bbb4357dc135 171 memcpy(&char_props, &properties, 1);
bogdanm 0:eff01767de02 172
Rohit Grover 6:bbb4357dc135 173 if (char_props.notify || char_props.indicate) {
Rohit Grover 6:bbb4357dc135 174 /* Notification requires cccd */
Rohit Grover 6:bbb4357dc135 175 memclr_( &cccd_md, sizeof(ble_gatts_attr_md_t));
Rohit Grover 6:bbb4357dc135 176 cccd_md.vloc = BLE_GATTS_VLOC_STACK;
Rohit Grover 6:bbb4357dc135 177 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm);
Rohit Grover 6:bbb4357dc135 178 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.write_perm);
Rohit Grover 6:bbb4357dc135 179 }
bogdanm 0:eff01767de02 180
Rohit Grover 6:bbb4357dc135 181 ble_gatts_char_md_t char_md = {0};
bogdanm 0:eff01767de02 182
Rohit Grover 6:bbb4357dc135 183 char_md.char_props = char_props;
Rohit Grover 6:bbb4357dc135 184 char_md.p_cccd_md =
Rohit Grover 6:bbb4357dc135 185 (char_props.notify || char_props.indicate) ? &cccd_md : NULL;
bogdanm 0:eff01767de02 186
Rohit Grover 6:bbb4357dc135 187 /* Attribute declaration */
Rohit Grover 6:bbb4357dc135 188 ble_gatts_attr_md_t attr_md = {0};
bogdanm 0:eff01767de02 189
Rohit Grover 6:bbb4357dc135 190 attr_md.vloc = BLE_GATTS_VLOC_STACK;
Rohit Grover 6:bbb4357dc135 191 attr_md.vlen = (min_length == max_length) ? 0 : 1;
bogdanm 0:eff01767de02 192
Rohit Grover 6:bbb4357dc135 193 if (char_props.read || char_props.notify || char_props.indicate) {
Rohit Grover 6:bbb4357dc135 194 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);
Rohit Grover 6:bbb4357dc135 195 }
Rohit Grover 6:bbb4357dc135 196
Rohit Grover 6:bbb4357dc135 197 if (char_props.write) {
Rohit Grover 6:bbb4357dc135 198 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);
Rohit Grover 6:bbb4357dc135 199 }
bogdanm 0:eff01767de02 200
Rohit Grover 6:bbb4357dc135 201 ble_gatts_attr_t attr_char_value = {0};
bogdanm 0:eff01767de02 202
Rohit Grover 6:bbb4357dc135 203 attr_char_value.p_uuid = p_uuid;
Rohit Grover 6:bbb4357dc135 204 attr_char_value.p_attr_md = &attr_md;
Rohit Grover 6:bbb4357dc135 205 attr_char_value.init_len = min_length;
Rohit Grover 6:bbb4357dc135 206 attr_char_value.max_len = max_length;
Rohit Grover 6:bbb4357dc135 207 attr_char_value.p_value = p_data;
bogdanm 0:eff01767de02 208
bogdanm 0:eff01767de02 209
Rohit Grover 6:bbb4357dc135 210 ASSERT_STATUS ( sd_ble_gatts_characteristic_add(service_handle,
Rohit Grover 6:bbb4357dc135 211 &char_md,
Rohit Grover 6:bbb4357dc135 212 &attr_char_value,
Rohit Grover 6:bbb4357dc135 213 p_char_handle));
bogdanm 0:eff01767de02 214
Rohit Grover 6:bbb4357dc135 215 return ERROR_NONE;
bogdanm 0:eff01767de02 216 }