Giovanni Bauermeister / nRF51822

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Dependencies:   nrf51-sdk

Dependents:  

Fork of nRF51822 by Lancaster University

source/nRF5xCharacteristicDescriptorDiscoverer.cpp@568:13b23a4b1f58, 2016-01-11 (annotated)

Committer:
vcoubard
Date:
Mon Jan 11 10:19:20 2016 +0000
Revision:
568:13b23a4b1f58
Parent:
563:9c4b96f7be8d
Child:
569:9e72aa06ec32
Synchronized with git rev c8d826ff

Author: Vincent Coubard

Documentation of descriptor discoverer class.

Simplify the process

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vcoubard 563:9c4b96f7be8d 1 /* mbed Microcontroller Library
vcoubard 563:9c4b96f7be8d 2 * Copyright (c) 2006-2015 ARM Limited
vcoubard 563:9c4b96f7be8d 3 *
vcoubard 563:9c4b96f7be8d 4 * Licensed under the Apache License, Version 2.0 (the "License");
vcoubard 563:9c4b96f7be8d 5 * you may not use this file except in compliance with the License.
vcoubard 563:9c4b96f7be8d 6 * You may obtain a copy of the License at
vcoubard 563:9c4b96f7be8d 7 *
vcoubard 563:9c4b96f7be8d 8 * http://www.apache.org/licenses/LICENSE-2.0
vcoubard 563:9c4b96f7be8d 9 *
vcoubard 563:9c4b96f7be8d 10 * Unless required by applicable law or agreed to in writing, software
vcoubard 563:9c4b96f7be8d 11 * distributed under the License is distributed on an "AS IS" BASIS,
vcoubard 563:9c4b96f7be8d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
vcoubard 563:9c4b96f7be8d 13 * See the License for the specific language governing permissions and
vcoubard 563:9c4b96f7be8d 14 * limitations under the License.
vcoubard 563:9c4b96f7be8d 15 */
vcoubard 563:9c4b96f7be8d 16 #include "nRF5xCharacteristicDescriptorDiscoverer.h"
vcoubard 563:9c4b96f7be8d 17 #include "ble_err.h"
vcoubard 563:9c4b96f7be8d 18 #include "mbed-drivers/mbed_error.h"
vcoubard 563:9c4b96f7be8d 19 #include "ble/DiscoveredCharacteristicDescriptor.h"
vcoubard 563:9c4b96f7be8d 20
vcoubard 568:13b23a4b1f58 21
vcoubard 568:13b23a4b1f58 22 nRF5xCharacteristicDescriptorDiscoverer::nRF5xCharacteristicDescriptorDiscoverer() :
vcoubard 568:13b23a4b1f58 23 discoveryRunning() {
vcoubard 568:13b23a4b1f58 24 // nothing to do
vcoubard 563:9c4b96f7be8d 25 }
vcoubard 563:9c4b96f7be8d 26
vcoubard 568:13b23a4b1f58 27 nRF5xCharacteristicDescriptorDiscoverer::~nRF5xCharacteristicDescriptorDiscoverer() {
vcoubard 568:13b23a4b1f58 28 // nothing to do
vcoubard 563:9c4b96f7be8d 29 }
vcoubard 563:9c4b96f7be8d 30
vcoubard 563:9c4b96f7be8d 31 ble_error_t nRF5xCharacteristicDescriptorDiscoverer::launch(
vcoubard 568:13b23a4b1f58 32 const DiscoveredCharacteristic& characteristic,
vcoubard 563:9c4b96f7be8d 33 const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& discoveryCallback,
vcoubard 563:9c4b96f7be8d 34 const CharacteristicDescriptorDiscovery::TerminationCallback_t& terminationCallback
vcoubard 563:9c4b96f7be8d 35 ) {
vcoubard 563:9c4b96f7be8d 36 Gap::Handle_t connHandle = characteristic.getConnectionHandle();
vcoubard 568:13b23a4b1f58 37 // it is ok to deduce that the start handle for descriptors is after
vcoubard 563:9c4b96f7be8d 38 // the characteristic declaration and the characteristic value declaration
vcoubard 563:9c4b96f7be8d 39 // see BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part G] (3.3)
vcoubard 563:9c4b96f7be8d 40 Gap::Handle_t descriptorStartHandle = characteristic.getDeclHandle() + 2;
vcoubard 563:9c4b96f7be8d 41 Gap::Handle_t descriptorEndHandle = characteristic.getLastHandle();
vcoubard 563:9c4b96f7be8d 42
vcoubard 568:13b23a4b1f58 43 // check if there is any descriptor to discover
vcoubard 568:13b23a4b1f58 44 if (descriptorEndHandle < descriptorStartHandle) {
vcoubard 568:13b23a4b1f58 45 CharacteristicDescriptorDiscovery::TerminationCallbackParams_t termParams = {
vcoubard 563:9c4b96f7be8d 46 characteristic,
vcoubard 563:9c4b96f7be8d 47 BLE_ERROR_NONE
vcoubard 563:9c4b96f7be8d 48 };
vcoubard 563:9c4b96f7be8d 49 terminationCallback.call(&termParams);
vcoubard 563:9c4b96f7be8d 50 return BLE_ERROR_NONE;
vcoubard 563:9c4b96f7be8d 51 }
vcoubard 563:9c4b96f7be8d 52
vcoubard 563:9c4b96f7be8d 53 // check if we can run this discovery
vcoubard 568:13b23a4b1f58 54 if (isConnectionInUse(connHandle)) {
vcoubard 563:9c4b96f7be8d 55 return BLE_STACK_BUSY;
vcoubard 563:9c4b96f7be8d 56 }
vcoubard 563:9c4b96f7be8d 57
vcoubard 563:9c4b96f7be8d 58 // get a new discovery slot, if none are available, just return
vcoubard 563:9c4b96f7be8d 59 Discovery* discovery = getAvailableDiscoverySlot();
vcoubard 563:9c4b96f7be8d 60 if(discovery == NULL) {
vcoubard 568:13b23a4b1f58 61 return BLE_STACK_BUSY;
vcoubard 563:9c4b96f7be8d 62 }
vcoubard 563:9c4b96f7be8d 63
vcoubard 568:13b23a4b1f58 64 // try to launch the discovery
vcoubard 563:9c4b96f7be8d 65 ble_error_t err = gattc_descriptors_discover(connHandle, descriptorStartHandle, descriptorEndHandle);
vcoubard 568:13b23a4b1f58 66 if(!err) {
vcoubard 563:9c4b96f7be8d 67 // commit the new discovery to its slot
vcoubard 563:9c4b96f7be8d 68 *discovery = Discovery(characteristic, discoveryCallback, terminationCallback);
vcoubard 563:9c4b96f7be8d 69 }
vcoubard 563:9c4b96f7be8d 70
vcoubard 563:9c4b96f7be8d 71 return err;
vcoubard 563:9c4b96f7be8d 72 }
vcoubard 563:9c4b96f7be8d 73
vcoubard 563:9c4b96f7be8d 74 bool nRF5xCharacteristicDescriptorDiscoverer::isActive(const DiscoveredCharacteristic& characteristic) const {
vcoubard 568:13b23a4b1f58 75 for(size_t i = 0; i < MAXIMUM_CONCURRENT_CONNECTIONS_COUNT; ++i) {
vcoubard 568:13b23a4b1f58 76 if(discoveryRunning[i].characteristic == characteristic) {
vcoubard 568:13b23a4b1f58 77 return true;
vcoubard 568:13b23a4b1f58 78 }
vcoubard 568:13b23a4b1f58 79 }
vcoubard 568:13b23a4b1f58 80 return false;
vcoubard 563:9c4b96f7be8d 81 }
vcoubard 563:9c4b96f7be8d 82
vcoubard 563:9c4b96f7be8d 83 void nRF5xCharacteristicDescriptorDiscoverer::requestTerminate(const DiscoveredCharacteristic& characteristic) {
vcoubard 563:9c4b96f7be8d 84 Discovery* discovery = findRunningDiscovery(characteristic);
vcoubard 568:13b23a4b1f58 85 if(discovery) {
vcoubard 563:9c4b96f7be8d 86 // call terminate anyway
vcoubard 568:13b23a4b1f58 87 terminate(discovery, BLE_ERROR_NONE);
vcoubard 563:9c4b96f7be8d 88 }
vcoubard 563:9c4b96f7be8d 89 }
vcoubard 563:9c4b96f7be8d 90
vcoubard 563:9c4b96f7be8d 91 void nRF5xCharacteristicDescriptorDiscoverer::process(uint16_t connectionHandle, const ble_gattc_evt_desc_disc_rsp_t& descriptors) {
vcoubard 563:9c4b96f7be8d 92 Discovery* discovery = findRunningDiscovery(connectionHandle);
vcoubard 568:13b23a4b1f58 93 // the discovery has been removed
vcoubard 568:13b23a4b1f58 94 if(!discovery) {
vcoubard 568:13b23a4b1f58 95 return;
vcoubard 563:9c4b96f7be8d 96 }
vcoubard 563:9c4b96f7be8d 97
vcoubard 563:9c4b96f7be8d 98 for (uint16_t i = 0; i < descriptors.count; ++i) {
vcoubard 563:9c4b96f7be8d 99 discovery->process(
vcoubard 563:9c4b96f7be8d 100 descriptors.descs[i].handle, UUID(descriptors.descs[i].uuid.uuid)
vcoubard 563:9c4b96f7be8d 101 );
vcoubard 563:9c4b96f7be8d 102 }
vcoubard 563:9c4b96f7be8d 103
vcoubard 563:9c4b96f7be8d 104 // prepare the next discovery request (if needed)
vcoubard 563:9c4b96f7be8d 105 uint16_t startHandle = descriptors.descs[descriptors.count - 1].handle + 1;
vcoubard 563:9c4b96f7be8d 106 uint16_t endHandle = discovery->characteristic.getLastHandle();
vcoubard 563:9c4b96f7be8d 107
vcoubard 568:13b23a4b1f58 108 if(startHandle > endHandle) {
vcoubard 568:13b23a4b1f58 109 terminate(discovery, BLE_ERROR_NONE);
vcoubard 563:9c4b96f7be8d 110 return;
vcoubard 563:9c4b96f7be8d 111 }
vcoubard 563:9c4b96f7be8d 112
vcoubard 563:9c4b96f7be8d 113 ble_error_t err = gattc_descriptors_discover(connectionHandle, startHandle, endHandle);
vcoubard 568:13b23a4b1f58 114 if(err) {
vcoubard 568:13b23a4b1f58 115 terminate(discovery, err);
vcoubard 563:9c4b96f7be8d 116 return;
vcoubard 563:9c4b96f7be8d 117 }
vcoubard 563:9c4b96f7be8d 118 }
vcoubard 563:9c4b96f7be8d 119
vcoubard 563:9c4b96f7be8d 120 void nRF5xCharacteristicDescriptorDiscoverer::terminate(uint16_t handle, ble_error_t err) {
vcoubard 563:9c4b96f7be8d 121 Discovery* discovery = findRunningDiscovery(handle);
vcoubard 568:13b23a4b1f58 122 // the discovery has already been terminated
vcoubard 568:13b23a4b1f58 123 if(!discovery) {
vcoubard 568:13b23a4b1f58 124 return;
vcoubard 563:9c4b96f7be8d 125 }
vcoubard 563:9c4b96f7be8d 126
vcoubard 568:13b23a4b1f58 127 terminate(discovery, err);
vcoubard 568:13b23a4b1f58 128 }
vcoubard 568:13b23a4b1f58 129
vcoubard 568:13b23a4b1f58 130 void nRF5xCharacteristicDescriptorDiscoverer::terminate(Discovery* discovery, ble_error_t err) {
vcoubard 568:13b23a4b1f58 131 // temporary copy, user code can try to launch a new discovery in the onTerminate
vcoubard 568:13b23a4b1f58 132 // callback. So, this discovery should not appear in such case.
vcoubard 563:9c4b96f7be8d 133 Discovery tmp = *discovery;
vcoubard 563:9c4b96f7be8d 134 *discovery = Discovery();
vcoubard 563:9c4b96f7be8d 135 tmp.terminate(err);
vcoubard 563:9c4b96f7be8d 136 }
vcoubard 563:9c4b96f7be8d 137
vcoubard 568:13b23a4b1f58 138
vcoubard 568:13b23a4b1f58 139
vcoubard 568:13b23a4b1f58 140 nRF5xCharacteristicDescriptorDiscoverer::Discovery*
vcoubard 563:9c4b96f7be8d 141 nRF5xCharacteristicDescriptorDiscoverer::findRunningDiscovery(const DiscoveredCharacteristic& characteristic) {
vcoubard 568:13b23a4b1f58 142 for(size_t i = 0; i < MAXIMUM_CONCURRENT_CONNECTIONS_COUNT; ++i) {
vcoubard 568:13b23a4b1f58 143 if(discoveryRunning[i].characteristic == characteristic && discoveryRunning[i].isEmpty() == false) {
vcoubard 563:9c4b96f7be8d 144 return &discoveryRunning[i];
vcoubard 563:9c4b96f7be8d 145 }
vcoubard 563:9c4b96f7be8d 146 }
vcoubard 563:9c4b96f7be8d 147 return NULL;
vcoubard 563:9c4b96f7be8d 148 }
vcoubard 563:9c4b96f7be8d 149
vcoubard 568:13b23a4b1f58 150 nRF5xCharacteristicDescriptorDiscoverer::Discovery*
vcoubard 568:13b23a4b1f58 151 nRF5xCharacteristicDescriptorDiscoverer::findRunningDiscovery(uint16_t handle) {
vcoubard 568:13b23a4b1f58 152 for(size_t i = 0; i < MAXIMUM_CONCURRENT_CONNECTIONS_COUNT; ++i) {
vcoubard 568:13b23a4b1f58 153 if(discoveryRunning[i].characteristic.getConnectionHandle() == handle &&
vcoubard 568:13b23a4b1f58 154 discoveryRunning[i].isEmpty() == false) {
vcoubard 563:9c4b96f7be8d 155 return &discoveryRunning[i];
vcoubard 563:9c4b96f7be8d 156 }
vcoubard 563:9c4b96f7be8d 157 }
vcoubard 563:9c4b96f7be8d 158 return NULL;
vcoubard 563:9c4b96f7be8d 159 }
vcoubard 563:9c4b96f7be8d 160
vcoubard 568:13b23a4b1f58 161
vcoubard 568:13b23a4b1f58 162 nRF5xCharacteristicDescriptorDiscoverer::Discovery*
vcoubard 568:13b23a4b1f58 163 nRF5xCharacteristicDescriptorDiscoverer::getAvailableDiscoverySlot() {
vcoubard 568:13b23a4b1f58 164 for(size_t i = 0; i < MAXIMUM_CONCURRENT_CONNECTIONS_COUNT; ++i) {
vcoubard 568:13b23a4b1f58 165 if(discoveryRunning[i].isEmpty()) {
vcoubard 563:9c4b96f7be8d 166 return &discoveryRunning[i];
vcoubard 563:9c4b96f7be8d 167 }
vcoubard 563:9c4b96f7be8d 168 }
vcoubard 563:9c4b96f7be8d 169 return NULL;
vcoubard 563:9c4b96f7be8d 170 }
vcoubard 563:9c4b96f7be8d 171
vcoubard 563:9c4b96f7be8d 172 bool nRF5xCharacteristicDescriptorDiscoverer::isConnectionInUse(uint16_t connHandle) {
vcoubard 563:9c4b96f7be8d 173 return findRunningDiscovery(connHandle) != NULL;
vcoubard 563:9c4b96f7be8d 174 }
vcoubard 563:9c4b96f7be8d 175
vcoubard 563:9c4b96f7be8d 176 ble_error_t nRF5xCharacteristicDescriptorDiscoverer::gattc_descriptors_discover(
vcoubard 568:13b23a4b1f58 177 uint16_t connection_handle, uint16_t start_handle, uint16_t end_handle) {
vcoubard 563:9c4b96f7be8d 178
vcoubard 563:9c4b96f7be8d 179 ble_gattc_handle_range_t discoveryRange = {
vcoubard 563:9c4b96f7be8d 180 start_handle,
vcoubard 563:9c4b96f7be8d 181 end_handle
vcoubard 563:9c4b96f7be8d 182 };
vcoubard 563:9c4b96f7be8d 183 uint32_t err = sd_ble_gattc_descriptors_discover(connection_handle, &discoveryRange);
vcoubard 563:9c4b96f7be8d 184
vcoubard 568:13b23a4b1f58 185 switch(err) {
vcoubard 563:9c4b96f7be8d 186 case NRF_SUCCESS:
vcoubard 568:13b23a4b1f58 187 return BLE_ERROR_NONE;
vcoubard 563:9c4b96f7be8d 188 case BLE_ERROR_INVALID_CONN_HANDLE:
vcoubard 563:9c4b96f7be8d 189 return BLE_ERROR_INVALID_PARAM;
vcoubard 563:9c4b96f7be8d 190 case NRF_ERROR_INVALID_ADDR:
vcoubard 563:9c4b96f7be8d 191 return BLE_ERROR_PARAM_OUT_OF_RANGE;
vcoubard 563:9c4b96f7be8d 192 case NRF_ERROR_BUSY:
vcoubard 563:9c4b96f7be8d 193 return BLE_STACK_BUSY;
vcoubard 563:9c4b96f7be8d 194 default:
vcoubard 563:9c4b96f7be8d 195 return BLE_ERROR_UNSPECIFIED;
vcoubard 563:9c4b96f7be8d 196 }
vcoubard 563:9c4b96f7be8d 197 }