2015-06-04 13:44:44 +00:00
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/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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2015-06-05 14:25:25 +00:00
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#include "nRF51ServiceDiscovery.h"
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2015-06-04 13:44:44 +00:00
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ble_error_t
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2015-06-05 14:25:25 +00:00
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nRF51ServiceDiscovery::launchCharacteristicDiscovery(Gap::Handle_t connectionHandle,
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2015-06-04 13:44:44 +00:00
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Gap::Handle_t startHandle,
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Gap::Handle_t endHandle)
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{
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characteristicDiscoveryStarted(connectionHandle);
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ble_gattc_handle_range_t handleRange = {
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.start_handle = startHandle,
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.end_handle = endHandle
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};
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uint32_t rc;
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if ((rc = sd_ble_gattc_characteristics_discover(connectionHandle, &handleRange)) != NRF_SUCCESS) {
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terminateCharacteristicDiscovery();
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switch (rc) {
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case BLE_ERROR_INVALID_CONN_HANDLE:
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case NRF_ERROR_INVALID_ADDR:
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return BLE_ERROR_INVALID_PARAM;
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case NRF_ERROR_BUSY:
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return BLE_STACK_BUSY;
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default:
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case NRF_ERROR_INVALID_STATE:
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return BLE_ERROR_INVALID_STATE;
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}
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}
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return BLE_ERROR_NONE;
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}
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void
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nRF51ServiceDiscovery::setupDiscoveredServices(const ble_gattc_evt_prim_srvc_disc_rsp_t *response)
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2015-06-04 13:44:44 +00:00
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{
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serviceIndex = 0;
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numServices = response->count;
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/* Account for the limitation on the number of discovered services we can handle at a time. */
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if (numServices > BLE_DB_DISCOVERY_MAX_SRV) {
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numServices = BLE_DB_DISCOVERY_MAX_SRV;
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}
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serviceUUIDDiscoveryQueue.reset();
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for (unsigned serviceIndex = 0; serviceIndex < numServices; serviceIndex++) {
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if (response->services[serviceIndex].uuid.type == BLE_UUID_TYPE_UNKNOWN) {
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serviceUUIDDiscoveryQueue.enqueue(serviceIndex);
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services[serviceIndex].setup(response->services[serviceIndex].handle_range.start_handle,
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response->services[serviceIndex].handle_range.end_handle);
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} else {
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services[serviceIndex].setup(response->services[serviceIndex].uuid.uuid,
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response->services[serviceIndex].handle_range.start_handle,
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response->services[serviceIndex].handle_range.end_handle);
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}
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}
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/* Trigger discovery of service UUID if necessary. */
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if (serviceUUIDDiscoveryQueue.getCount()) {
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serviceUUIDDiscoveryQueue.triggerFirst();
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}
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}
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void
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nRF51ServiceDiscovery::setupDiscoveredCharacteristics(const ble_gattc_evt_char_disc_rsp_t *response)
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{
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characteristicIndex = 0;
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numCharacteristics = response->count;
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/* Account for the limitation on the number of discovered characteristics we can handle at a time. */
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if (numCharacteristics > BLE_DB_DISCOVERY_MAX_CHAR_PER_SRV) {
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numCharacteristics = BLE_DB_DISCOVERY_MAX_CHAR_PER_SRV;
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}
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charUUIDDiscoveryQueue.reset();
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for (unsigned charIndex = 0; charIndex < numCharacteristics; charIndex++) {
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if (response->chars[charIndex].uuid.type == BLE_UUID_TYPE_UNKNOWN) {
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charUUIDDiscoveryQueue.enqueue(charIndex);
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characteristics[charIndex].setup(gattc,
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connHandle,
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response->chars[charIndex].char_props,
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response->chars[charIndex].handle_decl,
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response->chars[charIndex].handle_value);
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} else {
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characteristics[charIndex].setup(gattc,
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connHandle,
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response->chars[charIndex].uuid.uuid,
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response->chars[charIndex].char_props,
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response->chars[charIndex].handle_decl,
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response->chars[charIndex].handle_value);
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}
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}
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/* Trigger discovery of char UUID if necessary. */
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if (charUUIDDiscoveryQueue.getCount()) {
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charUUIDDiscoveryQueue.triggerFirst();
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}
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}
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void
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nRF51ServiceDiscovery::progressCharacteristicDiscovery(void)
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{
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/* Iterate through the previously discovered characteristics cached in characteristics[]. */
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while ((state == CHARACTERISTIC_DISCOVERY_ACTIVE) && (characteristicIndex < numCharacteristics)) {
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if ((matchingCharacteristicUUID == UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)) ||
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((matchingCharacteristicUUID == characteristics[characteristicIndex].getShortUUID()) &&
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(matchingServiceUUID != UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)))) {
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if (characteristicCallback) {
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characteristicCallback(&characteristics[characteristicIndex]);
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}
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}
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characteristicIndex++;
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}
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/* Relaunch discovery of new characteristics beyond the last entry cached in characteristics[]. */
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if (state == CHARACTERISTIC_DISCOVERY_ACTIVE) {
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/* Determine the ending handle of the last cached characteristic. */
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Gap::Handle_t startHandle = characteristics[characteristicIndex - 1].getValueHandle() + 1;
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Gap::Handle_t endHandle = services[serviceIndex].getEndHandle();
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resetDiscoveredCharacteristics(); /* Note: resetDiscoveredCharacteristics() must come after fetching start and end Handles. */
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if (startHandle < endHandle) {
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ble_gattc_handle_range_t handleRange = {
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.start_handle = startHandle,
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.end_handle = endHandle
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};
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if (sd_ble_gattc_characteristics_discover(connHandle, &handleRange) != NRF_SUCCESS) {
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terminateCharacteristicDiscovery();
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}
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} else {
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terminateCharacteristicDiscovery();
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}
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}
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}
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void
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nRF51ServiceDiscovery::progressServiceDiscovery(void)
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{
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/* Iterate through the previously discovered services cached in services[]. */
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while ((state == SERVICE_DISCOVERY_ACTIVE) && (serviceIndex < numServices)) {
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if ((matchingServiceUUID == UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN)) ||
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(matchingServiceUUID == services[serviceIndex].getUUID().getShortUUID())) {
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if (serviceCallback && (matchingCharacteristicUUID == UUID::ShortUUIDBytes_t(BLE_UUID_UNKNOWN))) {
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serviceCallback(&services[serviceIndex]);
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}
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if ((state == SERVICE_DISCOVERY_ACTIVE) && characteristicCallback) {
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launchCharacteristicDiscovery(connHandle, services[serviceIndex].getStartHandle(), services[serviceIndex].getEndHandle());
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} else {
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serviceIndex++;
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}
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} else {
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serviceIndex++;
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}
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}
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/* Relaunch discovery of new services beyond the last entry cached in services[]. */
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if ((state == SERVICE_DISCOVERY_ACTIVE) && (numServices > 0) && (serviceIndex > 0)) {
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/* Determine the ending handle of the last cached service. */
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Gap::Handle_t endHandle = services[serviceIndex - 1].getEndHandle();
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resetDiscoveredServices(); /* Note: resetDiscoveredServices() must come after fetching endHandle. */
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if (endHandle == SRV_DISC_END_HANDLE) {
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terminateServiceDiscovery();
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} else {
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if (sd_ble_gattc_primary_services_discover(connHandle, endHandle, NULL) != NRF_SUCCESS) {
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terminateServiceDiscovery();
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}
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}
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}
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}
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void
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nRF51ServiceDiscovery::ServiceUUIDDiscoveryQueue::triggerFirst(void)
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{
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while (numIndices) { /* loop until a call to char_value_by_uuid_read() succeeds or we run out of pending indices. */
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parentDiscoveryObject->state = DISCOVER_SERVICE_UUIDS;
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unsigned serviceIndex = getFirst();
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ble_uuid_t uuid = {
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.uuid = BLE_UUID_SERVICE_PRIMARY,
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.type = BLE_UUID_TYPE_BLE,
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};
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ble_gattc_handle_range_t handleRange = {
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.start_handle = parentDiscoveryObject->services[serviceIndex].getStartHandle(),
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.end_handle = parentDiscoveryObject->services[serviceIndex].getEndHandle(),
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};
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if (sd_ble_gattc_char_value_by_uuid_read(parentDiscoveryObject->connHandle, &uuid, &handleRange) == NRF_SUCCESS) {
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return;
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}
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/* Skip this service if we fail to launch a read for its service-declaration
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* attribute. Its UUID will remain INVALID, and it may not match any filters. */
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dequeue();
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}
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/* Switch back to service discovery upon exhausting the service-indices pending UUID discovery. */
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if (parentDiscoveryObject->state == DISCOVER_SERVICE_UUIDS) {
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parentDiscoveryObject->state = SERVICE_DISCOVERY_ACTIVE;
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}
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}
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void
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nRF51ServiceDiscovery::CharUUIDDiscoveryQueue::triggerFirst(void)
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2015-06-04 13:44:44 +00:00
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{
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while (numIndices) { /* loop until a call to char_value_by_uuid_read() succeeds or we run out of pending indices. */
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parentDiscoveryObject->state = DISCOVER_CHARACTERISTIC_UUIDS;
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unsigned charIndex = getFirst();
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ble_uuid_t uuid = {
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.uuid = BLE_UUID_CHARACTERISTIC,
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.type = BLE_UUID_TYPE_BLE,
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};
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ble_gattc_handle_range_t handleRange = {
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.start_handle = parentDiscoveryObject->characteristics[charIndex].getDeclHandle(),
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.end_handle = parentDiscoveryObject->characteristics[charIndex].getDeclHandle() + 1,
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};
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if (sd_ble_gattc_char_value_by_uuid_read(parentDiscoveryObject->connHandle, &uuid, &handleRange) == NRF_SUCCESS) {
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return;
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}
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/* Skip this service if we fail to launch a read for its service-declaration
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* attribute. Its UUID will remain INVALID, and it may not match any filters. */
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dequeue();
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}
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/* Switch back to service discovery upon exhausting the service-indices pending UUID discovery. */
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if (parentDiscoveryObject->state == DISCOVER_CHARACTERISTIC_UUIDS) {
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parentDiscoveryObject->state = CHARACTERISTIC_DISCOVERY_ACTIVE;
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}
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}
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void
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2015-06-05 14:25:25 +00:00
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nRF51ServiceDiscovery::processDiscoverUUIDResponse(const ble_gattc_evt_char_val_by_uuid_read_rsp_t *response)
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2015-06-04 13:44:44 +00:00
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{
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if (state == DISCOVER_SERVICE_UUIDS) {
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if ((response->count == 1) && (response->value_len == UUID::LENGTH_OF_LONG_UUID)) {
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UUID::LongUUIDBytes_t uuid;
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/* Switch longUUID bytes to MSB */
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for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
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uuid[i] = response->handle_value[0].p_value[UUID::LENGTH_OF_LONG_UUID - 1 - i];
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}
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unsigned serviceIndex = serviceUUIDDiscoveryQueue.dequeue();
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services[serviceIndex].setupLongUUID(uuid);
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serviceUUIDDiscoveryQueue.triggerFirst();
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} else {
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serviceUUIDDiscoveryQueue.dequeue();
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}
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} else if (state == DISCOVER_CHARACTERISTIC_UUIDS) {
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if ((response->count == 1) && (response->value_len == UUID::LENGTH_OF_LONG_UUID + 1 /* props */ + 2 /* value handle */)) {
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UUID::LongUUIDBytes_t uuid;
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/* Switch longUUID bytes to MSB */
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for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
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uuid[i] = response->handle_value[0].p_value[3 + UUID::LENGTH_OF_LONG_UUID - 1 - i];
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}
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unsigned charIndex = charUUIDDiscoveryQueue.dequeue();
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characteristics[charIndex].setupLongUUID(uuid);
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charUUIDDiscoveryQueue.triggerFirst();
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} else {
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charUUIDDiscoveryQueue.dequeue();
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}
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}
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}
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