nrf51822/source/nRF5xCharacteristicDescriptorDiscoverer.cpp

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/* mbed Microcontroller Library
* Copyright (c) 2006-2015 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nRF5xCharacteristicDescriptorDiscoverer.h"
#include "ble_err.h"
#include "ble/DiscoveredCharacteristicDescriptor.h"
nRF5xCharacteristicDescriptorDiscoverer::nRF5xCharacteristicDescriptorDiscoverer() :
discoveryRunning() {
// nothing to do
}
nRF5xCharacteristicDescriptorDiscoverer::~nRF5xCharacteristicDescriptorDiscoverer() {
// nothing to do
}
ble_error_t nRF5xCharacteristicDescriptorDiscoverer::launch(
const DiscoveredCharacteristic& characteristic,
const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& discoveryCallback,
const CharacteristicDescriptorDiscovery::TerminationCallback_t& terminationCallback
) {
Gap::Handle_t connHandle = characteristic.getConnectionHandle();
// it is ok to deduce that the start handle for descriptors is after
// the characteristic declaration and the characteristic value declaration
// see BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part G] (3.3)
Gap::Handle_t descriptorStartHandle = characteristic.getDeclHandle() + 2;
Gap::Handle_t descriptorEndHandle = characteristic.getLastHandle();
// check if there is any descriptor to discover
if (descriptorEndHandle < descriptorStartHandle) {
CharacteristicDescriptorDiscovery::TerminationCallbackParams_t termParams = {
characteristic,
BLE_ERROR_NONE
};
terminationCallback.call(&termParams);
return BLE_ERROR_NONE;
}
// check if we can run this discovery
if (isConnectionInUse(connHandle)) {
return BLE_STACK_BUSY;
}
// get a new discovery slot, if none are available, just return
Discovery* discovery = getAvailableDiscoverySlot();
if(discovery == NULL) {
return BLE_STACK_BUSY;
}
// try to launch the discovery
ble_error_t err = gattc_descriptors_discover(connHandle, descriptorStartHandle, descriptorEndHandle);
if(!err) {
// commit the new discovery to its slot
*discovery = Discovery(characteristic, discoveryCallback, terminationCallback);
}
return err;
}
bool nRF5xCharacteristicDescriptorDiscoverer::isActive(const DiscoveredCharacteristic& characteristic) const {
for(size_t i = 0; i < MAXIMUM_CONCURRENT_CONNECTIONS_COUNT; ++i) {
if(discoveryRunning[i].getCharacteristic() == characteristic) {
return true;
}
}
return false;
}
void nRF5xCharacteristicDescriptorDiscoverer::requestTerminate(const DiscoveredCharacteristic& characteristic) {
Discovery* discovery = findRunningDiscovery(characteristic);
if(discovery) {
// call terminate anyway
terminate(discovery, BLE_ERROR_NONE);
}
}
void nRF5xCharacteristicDescriptorDiscoverer::process(uint16_t connectionHandle, const ble_gattc_evt_desc_disc_rsp_t& descriptors) {
Discovery* discovery = findRunningDiscovery(connectionHandle);
// the discovery has been removed
if(!discovery) {
return;
}
for (uint16_t i = 0; i < descriptors.count; ++i) {
discovery->process(
descriptors.descs[i].handle, UUID(descriptors.descs[i].uuid.uuid)
);
}
// prepare the next discovery request (if needed)
uint16_t startHandle = descriptors.descs[descriptors.count - 1].handle + 1;
uint16_t endHandle = discovery->getCharacteristic().getLastHandle();
if(startHandle > endHandle) {
terminate(discovery, BLE_ERROR_NONE);
return;
}
ble_error_t err = gattc_descriptors_discover(connectionHandle, startHandle, endHandle);
if(err) {
terminate(discovery, err);
return;
}
}
void nRF5xCharacteristicDescriptorDiscoverer::terminate(uint16_t handle, ble_error_t err) {
Discovery* discovery = findRunningDiscovery(handle);
// the discovery has already been terminated
if(!discovery) {
return;
}
terminate(discovery, err);
}
void nRF5xCharacteristicDescriptorDiscoverer::terminate(Discovery* discovery, ble_error_t err) {
// temporary copy, user code can try to launch a new discovery in the onTerminate
// callback. So, this discovery should not appear in such case.
Discovery tmp = *discovery;
*discovery = Discovery();
tmp.terminate(err);
}
nRF5xCharacteristicDescriptorDiscoverer::Discovery*
nRF5xCharacteristicDescriptorDiscoverer::findRunningDiscovery(const DiscoveredCharacteristic& characteristic) {
for(size_t i = 0; i < MAXIMUM_CONCURRENT_CONNECTIONS_COUNT; ++i) {
if((discoveryRunning[i].getCharacteristic() == characteristic) &&
(discoveryRunning[i].isEmpty() == false)) {
return &discoveryRunning[i];
}
}
return NULL;
}
nRF5xCharacteristicDescriptorDiscoverer::Discovery*
nRF5xCharacteristicDescriptorDiscoverer::findRunningDiscovery(uint16_t handle) {
for(size_t i = 0; i < MAXIMUM_CONCURRENT_CONNECTIONS_COUNT; ++i) {
if((discoveryRunning[i].getCharacteristic().getConnectionHandle() == handle) &&
(discoveryRunning[i].isEmpty() == false)) {
return &discoveryRunning[i];
}
}
return NULL;
}
nRF5xCharacteristicDescriptorDiscoverer::Discovery*
nRF5xCharacteristicDescriptorDiscoverer::getAvailableDiscoverySlot() {
for(size_t i = 0; i < MAXIMUM_CONCURRENT_CONNECTIONS_COUNT; ++i) {
if(discoveryRunning[i].isEmpty()) {
return &discoveryRunning[i];
}
}
return NULL;
}
bool nRF5xCharacteristicDescriptorDiscoverer::isConnectionInUse(uint16_t connHandle) {
return findRunningDiscovery(connHandle) != NULL;
}
ble_error_t nRF5xCharacteristicDescriptorDiscoverer::gattc_descriptors_discover(
uint16_t connection_handle, uint16_t start_handle, uint16_t end_handle) {
ble_gattc_handle_range_t discoveryRange = {
start_handle,
end_handle
};
uint32_t err = sd_ble_gattc_descriptors_discover(connection_handle, &discoveryRange);
switch(err) {
case NRF_SUCCESS:
return BLE_ERROR_NONE;
case BLE_ERROR_INVALID_CONN_HANDLE:
return BLE_ERROR_INVALID_PARAM;
case NRF_ERROR_INVALID_ADDR:
return BLE_ERROR_PARAM_OUT_OF_RANGE;
case NRF_ERROR_BUSY:
return BLE_STACK_BUSY;
default:
return BLE_ERROR_UNSPECIFIED;
}
}
// implementation of nRF5xCharacteristicDescriptorDiscoverer::Discovery
nRF5xCharacteristicDescriptorDiscoverer::Discovery::Discovery() :
characteristic(), onDiscovery(), onTerminate() {
}
nRF5xCharacteristicDescriptorDiscoverer::Discovery::Discovery(
const DiscoveredCharacteristic& c, const DiscoveryCallback_t& dCb, const TerminationCallback_t& tCb) :
characteristic(c), onDiscovery(dCb), onTerminate(tCb) {
}
void nRF5xCharacteristicDescriptorDiscoverer::Discovery::process(
GattAttribute::Handle_t handle, const UUID& uuid) {
CharacteristicDescriptorDiscovery::DiscoveryCallbackParams_t params = {
characteristic,
DiscoveredCharacteristicDescriptor(
characteristic.getGattClient(),
characteristic.getConnectionHandle(),
handle,
uuid
)
};
onDiscovery.call(&params);
}
void nRF5xCharacteristicDescriptorDiscoverer::Discovery::terminate(ble_error_t err) {
CharacteristicDescriptorDiscovery::TerminationCallbackParams_t params = {
characteristic,
err
};
onTerminate.call(&params);
}
bool nRF5xCharacteristicDescriptorDiscoverer::Discovery::isEmpty() const {
return *this == Discovery();
}
const DiscoveredCharacteristic& nRF5xCharacteristicDescriptorDiscoverer::Discovery::getCharacteristic() const {
return characteristic;
}