Francesco Pavoni
BLE_Nano nRF51 Central heart rate
Diff: nRF51_SDK_11/components/ble/ble_db_discovery/ble_db_discovery.c
- Revision:
- 0:2b9b5764efb5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/nRF51_SDK_11/components/ble/ble_db_discovery/ble_db_discovery.c Thu May 26 10:12:27 2016 +0000
@@ -0,0 +1,940 @@
+/* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved.
+ *
+ * The information contained herein is property of Nordic Semiconductor ASA.
+ * Terms and conditions of usage are described in detail in NORDIC
+ * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
+ *
+ * Licensees are granted free, non-transferable use of the information. NO
+ * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
+ * the file.
+ */
+
+#include "ble_db_discovery.h"
+#include <stdlib.h>
+#include "ble.h"
+#include "nrf_log.h"
+
+#include "sdk_common.h"
+
+#define SRV_DISC_START_HANDLE 0x0001 /**< The start handle value used during service discovery. */
+#define DB_DISCOVERY_MAX_USERS BLE_DB_DISCOVERY_MAX_SRV /**< The maximum number of users/registrations allowed by this module. */
+#define DB_LOG NRF_LOG_PRINTF_DEBUG /**< A debug logger macro that can be used in this file to do logging information over UART. */
+
+
+/**@brief Array of structures containing information about the registered application modules. */
+static ble_uuid_t m_registered_handlers[DB_DISCOVERY_MAX_USERS];
+
+
+/**@brief Array of structures containing pending events to be sent to the application modules.
+ *
+ * @details Whenever a discovery related event is to be raised to a user module, it will be stored
+ * in this array first. When all services needed to be discovered have been
+ * discovered, all pending events will be sent to the corresponding user modules.
+ **/
+static struct
+{
+ ble_db_discovery_evt_t evt; /**< The pending event. */
+ ble_db_discovery_evt_handler_t evt_handler; /**< The event handler which should be called to raise this event. */
+} m_pending_user_evts[DB_DISCOVERY_MAX_USERS];
+
+static ble_db_discovery_evt_handler_t m_evt_handler;
+static uint32_t m_pending_usr_evt_index; /**< The index to the pending user event array, pointing to the last added pending user event. */
+static uint32_t m_num_of_handlers_reg; /**< The number of handlers registered with the DB Discovery module. */
+static bool m_initialized = false; /**< This variable Indicates if the module is initialized or not. */
+
+#define MODULE_INITIALIZED (m_initialized == true)
+#include "sdk_macros.h"
+
+/**@brief Function for fetching the event handler provided by a registered application module.
+ *
+ * @param[in] srv_uuid UUID of the service.
+ *
+ * @retval evt_handler Event handler of the module, registered for the given service UUID.
+ * @retval NULL If no event handler is found.
+ */
+static ble_db_discovery_evt_handler_t registered_handler_get(const ble_uuid_t * const p_srv_uuid)
+{
+ uint32_t i;
+
+ for (i = 0; i < m_num_of_handlers_reg; i++)
+ {
+ if (BLE_UUID_EQ(&(m_registered_handlers[i]), p_srv_uuid))
+ {
+ return (m_evt_handler);
+ }
+ }
+
+ return NULL;
+}
+
+
+/**@brief Function for storing the event handler provided by a registered application module.
+ *
+ * @param[in] p_srv_uuid The UUID of the service.
+ * @param[in] p_evt_handler The event handler provided by the application.
+ *
+ * @retval NRF_SUCCESS If the handler was stored or already present in the list.
+ * @retval NRF_ERROR_NO_MEM If there is no space left to store the handler.
+ */
+static uint32_t registered_handler_set(const ble_uuid_t * const p_srv_uuid,
+ ble_db_discovery_evt_handler_t p_evt_handler)
+{
+ if (registered_handler_get(p_srv_uuid) != NULL)
+ {
+ return NRF_SUCCESS;
+ }
+ if (m_num_of_handlers_reg < DB_DISCOVERY_MAX_USERS)
+ {
+ m_registered_handlers[m_num_of_handlers_reg] = *p_srv_uuid;
+
+ m_num_of_handlers_reg++;
+
+ return NRF_SUCCESS;
+ }
+ else
+ {
+ return NRF_ERROR_NO_MEM;
+ }
+}
+
+
+/**@brief Function for sending all pending discovery events to the corresponding user modules.
+ */
+static void pending_user_evts_send(void)
+{
+ uint32_t i = 0;
+
+ for (i = 0; i < m_num_of_handlers_reg; i++)
+ {
+ // Pass the event to the corresponding event handler.
+ m_pending_user_evts[i].evt_handler(&(m_pending_user_evts[i].evt));
+ }
+ m_pending_usr_evt_index = 0;
+}
+
+
+/**@brief Function for indicating error to the application.
+ *
+ * @details This function will fetch the event handler based on the UUID of the service being
+ * discovered. (The event handler is registered by the application beforehand).
+ * The error code is added to the pending events together with the event handler.
+ * If no event handler was found, then this function will do nothing.
+ *
+ * @param[in] p_db_discovery Pointer to the DB discovery structure.
+ * @param[in] err_code Error code that should be provided to the application.
+ * @param[in] conn_handle Connection Handle.
+ *
+ */
+static void discovery_error_evt_trigger(ble_db_discovery_t * const p_db_discovery,
+ uint32_t err_code,
+ uint16_t const conn_handle)
+{
+ ble_db_discovery_evt_handler_t p_evt_handler;
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ p_evt_handler = registered_handler_get(&(p_srv_being_discovered->srv_uuid));
+
+ if (p_evt_handler != NULL)
+ {
+ ble_db_discovery_evt_t evt;
+
+ evt.conn_handle = conn_handle;
+ evt.evt_type = BLE_DB_DISCOVERY_ERROR;
+ evt.params.err_code = err_code;
+
+ p_evt_handler(&evt);
+ }
+}
+
+
+/**@brief Function for triggering a Discovery Complete or Service Not Found event to the
+ * application.
+ *
+ * @details This function will fetch the event handler based on the UUID of the service being
+ * discovered. (The event handler is registered by the application beforehand).
+ * It then triggers an event indicating the completion of the service discovery.
+ * If no event handler was found, then this function will do nothing.
+ *
+ * @param[in] p_db_discovery Pointer to the DB discovery structure.
+ * @param[in] is_srv_found Variable to indicate if the service was found at the peer.
+ * @param[in] conn_handle Connection Handle.
+ */
+static void discovery_complete_evt_trigger(ble_db_discovery_t * const p_db_discovery,
+ bool is_srv_found,
+ uint16_t const conn_handle)
+{
+ ble_db_discovery_evt_handler_t p_evt_handler;
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ p_evt_handler = registered_handler_get(&(p_srv_being_discovered->srv_uuid));
+
+ if (p_evt_handler != NULL)
+ {
+ if (m_pending_usr_evt_index < DB_DISCOVERY_MAX_USERS)
+ {
+ // Insert an event into the pending event list.
+ m_pending_user_evts[m_pending_usr_evt_index].evt.conn_handle = conn_handle;
+
+ m_pending_user_evts[m_pending_usr_evt_index].evt.params.discovered_db =
+ *p_srv_being_discovered;
+ if (is_srv_found)
+ {
+ m_pending_user_evts[m_pending_usr_evt_index].evt.evt_type =
+ BLE_DB_DISCOVERY_COMPLETE;
+ }
+ else
+ {
+ m_pending_user_evts[m_pending_usr_evt_index].evt.evt_type =
+ BLE_DB_DISCOVERY_SRV_NOT_FOUND;
+ }
+ m_pending_user_evts[m_pending_usr_evt_index].evt_handler = p_evt_handler;
+
+ m_pending_usr_evt_index++;
+
+ if (m_pending_usr_evt_index == m_num_of_handlers_reg)
+ {
+ // All registered modules have pending events. Send all pending events to the user
+ // modules.
+ pending_user_evts_send();
+ }
+ else
+ {
+ // Too many events pending. Do nothing. (Ideally this should not happen.)
+ }
+ }
+ }
+}
+
+
+/**@brief Function for handling service discovery completion.
+ *
+ * @details This function will be used to determine if there are more services to be discovered,
+ * and if so, initiate the discovery of the next service.
+ *
+ * @param[in] p_db_discovery Pointer to the DB Discovery Structure.
+ * @param[in] conn_handle Connection Handle.
+ */
+static void on_srv_disc_completion(ble_db_discovery_t * p_db_discovery,
+ uint16_t const conn_handle)
+{
+ p_db_discovery->discoveries_count++;
+
+ // Check if more services need to be discovered.
+ if (p_db_discovery->discoveries_count < m_num_of_handlers_reg)
+ {
+ // Reset the current characteristic index since a new service discovery is about to start.
+ p_db_discovery->curr_char_ind = 0;
+
+ // Initiate discovery of the next service.
+ p_db_discovery->curr_srv_ind++;
+
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ p_srv_being_discovered->srv_uuid = m_registered_handlers[p_db_discovery->curr_srv_ind];
+
+ // Reset the characteristic count in the current service to zero since a new service
+ // discovery is about to start.
+ p_srv_being_discovered->char_count = 0;
+
+ DB_LOG("[DB]: Starting discovery of service with UUID 0x%x for Connection handle %d\r\n",
+ p_srv_being_discovered->srv_uuid.uuid, conn_handle);
+
+ uint32_t err_code;
+
+ err_code = sd_ble_gattc_primary_services_discover
+ (
+ conn_handle,
+ SRV_DISC_START_HANDLE,
+ &(p_srv_being_discovered->srv_uuid)
+ );
+ if (err_code != NRF_SUCCESS)
+ {
+ p_db_discovery->discovery_in_progress = false;
+
+ // Error with discovering the service.
+ // Indicate the error to the registered user application.
+ discovery_error_evt_trigger(p_db_discovery, err_code, conn_handle);
+
+ m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE;
+ m_pending_user_evts[0].evt.conn_handle = conn_handle;
+// m_evt_handler(&m_pending_user_evts[0].evt);
+
+ return;
+ }
+ }
+ else
+ {
+ // No more service discovery is needed.
+ p_db_discovery->discovery_in_progress = false;
+ m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE;
+ m_pending_user_evts[0].evt.conn_handle = conn_handle;
+ //m_evt_handler(&m_pending_user_evts[0].evt);
+ }
+}
+
+
+/**@brief Function for finding out if a characteristic discovery should be performed after the
+ * last discovered characteristic.
+ *
+ * @details This function is used during the time of database discovery to find out if there is
+ * a need to do more characteristic discoveries. The value handles of the
+ * last discovered characteristic is compared with the end handle of the service.
+ * If the service handle is greater than one of the former characteristic handles,
+ * it means that a characteristic discovery is required.
+ *
+ * @param[in] p_db_discovery The pointer to the DB Discovery structure.
+ * @param[in] p_after_char The pointer to the last discovered characteristic.
+ *
+ * @retval True if a characteristic discovery is required.
+ * @retval False if a characteristic discovery is NOT required.
+ */
+static bool is_char_discovery_reqd(ble_db_discovery_t * const p_db_discovery,
+ ble_gattc_char_t * p_after_char)
+{
+ if (
+ p_after_char->handle_value <
+ p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle
+ )
+ {
+ // Handle value of the characteristic being discovered is less than the end handle of
+ // the service being discovered. There is a possibility of more characteristics being
+ // present. Hence a characteristic discovery is required.
+ return true;
+ }
+
+ return false;
+}
+
+
+/**@brief Function to find out if a descriptor discovery is required.
+ *
+ * @details This function finds out if there is a possibility of existence of descriptors between
+ * current characteristic and the next characteristic. If so, this function will compute
+ * the handle range on which the descriptors may be present and will return it.
+ * If the current characteristic is the last known characteristic, then this function
+ * will use the service end handle to find out if the current characteristic can have
+ * descriptors.
+ *
+ * @param[in] p_db_discovery Pointer to the DB Discovery structure.
+ * @param[in] p_curr_char Pointer to the current characteristic.
+ * @param[in] p_next_char Pointer to the next characteristic. This should be NULL if the
+ * caller knows that there is no characteristic after the current
+ * characteristic at the peer.
+ * @param[out] p_handle_range Pointer to the handle range in which descriptors may exist at the
+ * the peer.
+ *
+ * @retval True If a descriptor discovery is required.
+ * @retval False If a descriptor discovery is NOT required.
+ */
+static bool is_desc_discovery_reqd(ble_db_discovery_t * p_db_discovery,
+ ble_gatt_db_char_t * p_curr_char,
+ ble_gatt_db_char_t * p_next_char,
+ ble_gattc_handle_range_t * p_handle_range)
+{
+ if (p_next_char == NULL)
+ {
+ // Current characteristic is the last characteristic in the service. Check if the value
+ // handle of the current characteristic is equal to the service end handle.
+ if (
+ p_curr_char->characteristic.handle_value ==
+ p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle
+ )
+ {
+ // No descriptors can be present for the current characteristic. p_curr_char is the last
+ // characteristic with no descriptors.
+ return false;
+ }
+
+ p_handle_range->start_handle = p_curr_char->characteristic.handle_value + 1;
+
+ // Since the current characteristic is the last characteristic in the service, the end
+ // handle should be the end handle of the service.
+ p_handle_range->end_handle =
+ p_db_discovery->services[p_db_discovery->curr_srv_ind].handle_range.end_handle;
+
+ return true;
+ }
+
+ // p_next_char != NULL. Check for existence of descriptors between the current and the next
+ // characteristic.
+ if ((p_curr_char->characteristic.handle_value + 1) == p_next_char->characteristic.handle_decl)
+ {
+ // No descriptors can exist between the two characteristic.
+ return false;
+ }
+
+ p_handle_range->start_handle = p_curr_char->characteristic.handle_value + 1;
+ p_handle_range->end_handle = p_next_char->characteristic.handle_decl - 1;
+
+ return true;
+}
+
+
+/**@brief Function for performing characteristic discovery.
+ *
+ * @param[in] p_db_discovery Pointer to the DB Discovery structure.
+ * @param[in] conn_handle Connection Handle.
+ *
+ * @return NRF_SUCCESS if the SoftDevice was successfully requested to perform the characteristic
+ * discovery. Otherwise an error code. This function returns the error code returned
+ * by the SoftDevice API @ref sd_ble_gattc_characteristics_discover.
+ */
+static uint32_t characteristics_discover(ble_db_discovery_t * const p_db_discovery,
+ uint16_t const conn_handle)
+{
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+ ble_gattc_handle_range_t handle_range;
+
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ if (p_db_discovery->curr_char_ind != 0)
+ {
+ // This is not the first characteristic being discovered. Hence the 'start handle' to be
+ // used must be computed using the handle_value of the previous characteristic.
+ ble_gattc_char_t * p_prev_char;
+ uint8_t prev_char_ind = p_db_discovery->curr_char_ind - 1;
+
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ p_prev_char = &(p_srv_being_discovered->charateristics[prev_char_ind].characteristic);
+
+ handle_range.start_handle = p_prev_char->handle_value + 1;
+ }
+ else
+ {
+ // This is the first characteristic of this service being discovered.
+ handle_range.start_handle = p_srv_being_discovered->handle_range.start_handle;
+ }
+
+ handle_range.end_handle = p_srv_being_discovered->handle_range.end_handle;
+
+ return sd_ble_gattc_characteristics_discover(conn_handle, &handle_range);
+}
+
+
+/**@brief Function for performing descriptor discovery, if required.
+ *
+ * @details This function will check if descriptor discovery is required and then perform it if
+ * needed. If no more descriptor discovery is required for the service, then the output
+ * parameter p_raise_discov_complete is set to true, indicating to the caller that a
+ * discovery complete event can be triggered to the application.
+ *
+ * @param[in] p_db_discovery Pointer to the DB Discovery structure.
+ * @param[out] p_raise_discov_complete The value pointed to by this pointer will be set to true if
+ * the Discovery Complete event can be triggered to the
+ * application.
+ * @param[in] conn_handle Connection Handle.
+ *
+ * @return NRF_SUCCESS if the SoftDevice was successfully requested to perform the descriptor
+ * discovery, or if no more descriptor discovery is required. Otherwise an error code.
+ * This function returns the error code returned by the SoftDevice API @ref
+ * sd_ble_gattc_descriptors_discover.
+ */
+static uint32_t descriptors_discover(ble_db_discovery_t * const p_db_discovery,
+ bool * p_raise_discov_complete,
+ uint16_t const conn_handle)
+{
+ ble_gattc_handle_range_t handle_range;
+ ble_gatt_db_char_t * p_curr_char_being_discovered;
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+ bool is_discovery_reqd = false;
+
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ p_curr_char_being_discovered =
+ &(p_srv_being_discovered->charateristics[p_db_discovery->curr_char_ind]);
+
+ if ((p_db_discovery->curr_char_ind + 1) == p_srv_being_discovered->char_count)
+ {
+ // This is the last characteristic of this service.
+ is_discovery_reqd = is_desc_discovery_reqd(p_db_discovery,
+ p_curr_char_being_discovered,
+ NULL,
+ &handle_range);
+ }
+ else
+ {
+ uint8_t i;
+ ble_gatt_db_char_t * p_next_char;
+
+ for (i = p_db_discovery->curr_char_ind;
+ i < p_srv_being_discovered->char_count;
+ i++)
+ {
+
+ if (i == (p_srv_being_discovered->char_count - 1))
+ {
+ // The current characteristic is the last characteristic in the service.
+ p_next_char = NULL;
+ }
+ else
+ {
+ p_next_char = &(p_srv_being_discovered->charateristics[i + 1]);
+ }
+
+ // Check if it is possible for the current characteristic to have a descriptor.
+ if (is_desc_discovery_reqd(p_db_discovery,
+ p_curr_char_being_discovered,
+ p_next_char,
+ &handle_range))
+ {
+ is_discovery_reqd = true;
+ break;
+ }
+ else
+ {
+ // No descriptors can exist.
+ p_curr_char_being_discovered = p_next_char;
+ p_db_discovery->curr_char_ind++;
+ }
+ }
+ }
+
+ if (!is_discovery_reqd)
+ {
+ // No more descriptor discovery required. Discovery is complete.
+ // This informs the caller that a discovery complete event can be triggered.
+ *p_raise_discov_complete = true;
+
+ return NRF_SUCCESS;
+ }
+
+ *p_raise_discov_complete = false;
+
+ return sd_ble_gattc_descriptors_discover(conn_handle, &handle_range);
+}
+
+
+/**@brief Function for handling primary service discovery response.
+ *
+ * @details This function will handle the primary service discovery response and start the
+ * discovery of characteristics within that service.
+ *
+ * @param[in] p_db_discovery Pointer to the DB Discovery structure.
+ * @param[in] p_ble_gattc_evt Pointer to the GATT Client event.
+ */
+static void on_primary_srv_discovery_rsp(ble_db_discovery_t * const p_db_discovery,
+ const ble_gattc_evt_t * const p_ble_gattc_evt)
+{
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle)
+ {
+ return;
+ }
+ if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS)
+ {
+ uint32_t err_code;
+ const ble_gattc_evt_prim_srvc_disc_rsp_t * p_prim_srvc_disc_rsp_evt;
+
+ DB_LOG("Found service UUID 0x%x\r\n", p_srv_being_discovered->srv_uuid.uuid);
+
+ p_prim_srvc_disc_rsp_evt = &(p_ble_gattc_evt->params.prim_srvc_disc_rsp);
+
+ p_srv_being_discovered->srv_uuid = p_prim_srvc_disc_rsp_evt->services[0].uuid;
+ p_srv_being_discovered->handle_range = p_prim_srvc_disc_rsp_evt->services[0].handle_range;
+
+ err_code = characteristics_discover(p_db_discovery,
+ p_ble_gattc_evt->conn_handle);
+
+ if (err_code != NRF_SUCCESS)
+ {
+ p_db_discovery->discovery_in_progress = false;
+
+ // Error with discovering the service.
+ // Indicate the error to the registered user application.
+ discovery_error_evt_trigger(p_db_discovery,
+ err_code,
+ p_ble_gattc_evt->conn_handle);
+
+ m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE;
+ m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle;
+ //m_evt_handler(&m_pending_user_evts[0].evt);
+ }
+ }
+ else
+ {
+ DB_LOG("Service UUID 0x%x Not found\r\n", p_srv_being_discovered->srv_uuid.uuid);
+ // Trigger Service Not Found event to the application.
+ discovery_complete_evt_trigger(p_db_discovery,
+ false,
+ p_ble_gattc_evt->conn_handle);
+
+ on_srv_disc_completion(p_db_discovery,
+ p_ble_gattc_evt->conn_handle);
+ }
+}
+
+
+/**@brief Function for handling characteristic discovery response.
+ *
+ * @param[in] p_db_discovery Pointer to the DB Discovery structure.
+ * @param[in] p_ble_gattc_evt Pointer to the GATT Client event.
+ */
+static void on_characteristic_discovery_rsp(ble_db_discovery_t * const p_db_discovery,
+ const ble_gattc_evt_t * const p_ble_gattc_evt)
+{
+ uint32_t err_code;
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+ bool perform_desc_discov = false;
+
+ if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle)
+ {
+ return;
+ }
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS)
+ {
+ const ble_gattc_evt_char_disc_rsp_t * p_char_disc_rsp_evt;
+
+ p_char_disc_rsp_evt = &(p_ble_gattc_evt->params.char_disc_rsp);
+
+ // Find out the number of characteristics that were previously discovered (in earlier
+ // characteristic discovery responses, if any).
+ uint8_t num_chars_prev_disc = p_srv_being_discovered->char_count;
+
+ // Find out the number of characteristics that are currently discovered (in the
+ // characteristic discovery response being handled).
+ uint8_t num_chars_curr_disc = p_char_disc_rsp_evt->count;
+
+ // Check if the total number of discovered characteristics are supported by this module.
+ if ((num_chars_prev_disc + num_chars_curr_disc) <= BLE_GATT_DB_MAX_CHARS)
+ {
+ // Update the characteristics count.
+ p_srv_being_discovered->char_count += num_chars_curr_disc;
+ }
+ else
+ {
+ // The number of characteristics discovered at the peer is more than the supported
+ // maximum. This module will store only the characteristics found up to this point.
+ p_srv_being_discovered->char_count = BLE_GATT_DB_MAX_CHARS;
+ }
+
+ uint32_t i;
+ uint32_t j;
+
+ for (i = num_chars_prev_disc, j = 0; i < p_srv_being_discovered->char_count; i++, j++)
+ {
+ p_srv_being_discovered->charateristics[i].characteristic =
+ p_char_disc_rsp_evt->chars[j];
+
+ p_srv_being_discovered->charateristics[i].cccd_handle = BLE_GATT_HANDLE_INVALID;
+ }
+
+ ble_gattc_char_t * p_last_known_char;
+
+ p_last_known_char = &(p_srv_being_discovered->charateristics[i - 1].characteristic);
+
+ // If no more characteristic discovery is required, or if the maximum number of supported
+ // characteristic per service has been reached, descriptor discovery will be performed.
+ if (
+ !is_char_discovery_reqd(p_db_discovery, p_last_known_char) ||
+ (p_srv_being_discovered->char_count == BLE_GATT_DB_MAX_CHARS)
+ )
+ {
+ perform_desc_discov = true;
+ }
+ else
+ {
+ // Update the current characteristic index.
+ p_db_discovery->curr_char_ind = p_srv_being_discovered->char_count;
+
+ // Perform another round of characteristic discovery.
+ err_code = characteristics_discover(p_db_discovery,
+ p_ble_gattc_evt->conn_handle);
+
+ if (err_code != NRF_SUCCESS)
+ {
+ p_db_discovery->discovery_in_progress = false;
+
+ discovery_error_evt_trigger(p_db_discovery,
+ err_code,
+ p_ble_gattc_evt->conn_handle);
+
+ m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE;
+ m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle;
+ //m_evt_handler(&m_pending_user_evts[0].evt);
+
+ return;
+ }
+ }
+ }
+ else
+ {
+ // The previous characteristic discovery resulted in no characteristics.
+ // descriptor discovery should be performed.
+ perform_desc_discov = true;
+ }
+
+ if (perform_desc_discov)
+ {
+ bool raise_discov_complete;
+
+ p_db_discovery->curr_char_ind = 0;
+
+ err_code = descriptors_discover(p_db_discovery,
+ &raise_discov_complete,
+ p_ble_gattc_evt->conn_handle);
+
+ if (err_code != NRF_SUCCESS)
+ {
+ p_db_discovery->discovery_in_progress = false;
+
+ discovery_error_evt_trigger(p_db_discovery,
+ err_code,
+ p_ble_gattc_evt->conn_handle);
+
+ m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE;
+ m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle;
+ //m_evt_handler(&m_pending_user_evts[0].evt);
+
+ return;
+ }
+ if (raise_discov_complete)
+ {
+ // No more characteristics and descriptors need to be discovered. Discovery is complete.
+ // Send a discovery complete event to the user application.
+ DB_LOG("[DB]: Discovery of service with UUID 0x%x completed with success for Connection"
+ " handle %d\r\n", p_srv_being_discovered->srv_uuid.uuid,
+ p_ble_gattc_evt->conn_handle);
+
+ discovery_complete_evt_trigger(p_db_discovery,
+ true,
+ p_ble_gattc_evt->conn_handle);
+
+ on_srv_disc_completion(p_db_discovery,
+ p_ble_gattc_evt->conn_handle);
+ }
+ }
+}
+
+
+/**@brief Function for handling descriptor discovery response.
+ *
+ * @param[in] p_db_discovery Pointer to the DB Discovery structure.
+ * @param[in] p_ble_gattc_evt Pointer to the GATT Client event.
+ */
+static void on_descriptor_discovery_rsp(ble_db_discovery_t * const p_db_discovery,
+ const ble_gattc_evt_t * const p_ble_gattc_evt)
+{
+ const ble_gattc_evt_desc_disc_rsp_t * p_desc_disc_rsp_evt;
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+
+ if (p_ble_gattc_evt->conn_handle != p_db_discovery->conn_handle)
+ {
+ return;
+ }
+
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ p_desc_disc_rsp_evt = &(p_ble_gattc_evt->params.desc_disc_rsp);
+
+ ble_gatt_db_char_t * p_char_being_discovered =
+ &(p_srv_being_discovered->charateristics[p_db_discovery->curr_char_ind]);
+
+ if (p_ble_gattc_evt->gatt_status == BLE_GATT_STATUS_SUCCESS)
+ {
+ // The descriptor was found at the peer.
+ // If the descriptor was a CCCD, then the cccd_handle needs to be populated.
+
+ uint32_t i;
+
+ // Loop through all the descriptors to find the CCCD.
+ for (i = 0; i < p_desc_disc_rsp_evt->count; i++)
+ {
+ if (
+ p_desc_disc_rsp_evt->descs[i].uuid.uuid ==
+ BLE_UUID_DESCRIPTOR_CLIENT_CHAR_CONFIG
+ )
+ {
+ p_char_being_discovered->cccd_handle = p_desc_disc_rsp_evt->descs[i].handle;
+
+ break;
+ }
+ }
+ }
+
+ bool raise_discov_complete = false;
+
+ if ((p_db_discovery->curr_char_ind + 1) == p_srv_being_discovered->char_count)
+ {
+ // No more characteristics and descriptors need to be discovered. Discovery is complete.
+ // Send a discovery complete event to the user application.
+
+ raise_discov_complete = true;
+ }
+ else
+ {
+ // Begin discovery of descriptors for the next characteristic.
+ uint32_t err_code;
+
+ p_db_discovery->curr_char_ind++;
+
+ err_code = descriptors_discover(p_db_discovery,
+ &raise_discov_complete,
+ p_ble_gattc_evt->conn_handle);
+
+ if (err_code != NRF_SUCCESS)
+ {
+ p_db_discovery->discovery_in_progress = false;
+
+ // Error with discovering the service.
+ // Indicate the error to the registered user application.
+ discovery_error_evt_trigger(p_db_discovery,
+ err_code,
+ p_ble_gattc_evt->conn_handle);
+
+ m_pending_user_evts[0].evt.evt_type = BLE_DB_DISCOVERY_AVAILABLE;
+ m_pending_user_evts[0].evt.conn_handle = p_ble_gattc_evt->conn_handle;
+
+ return;
+ }
+ }
+
+ if (raise_discov_complete)
+ {
+ DB_LOG("[DB]: Discovery of service with UUID 0x%x completed with success for Connection"
+ "handle %d\r\n", p_srv_being_discovered->srv_uuid.uuid,
+ p_ble_gattc_evt->conn_handle);
+
+ discovery_complete_evt_trigger(p_db_discovery,
+ true,
+ p_ble_gattc_evt->conn_handle);
+
+ on_srv_disc_completion(p_db_discovery,
+ p_ble_gattc_evt->conn_handle);
+ }
+}
+
+
+uint32_t ble_db_discovery_init(const ble_db_discovery_evt_handler_t evt_handler)
+{
+ uint32_t err_code = NRF_SUCCESS;
+ VERIFY_PARAM_NOT_NULL(evt_handler);
+
+ m_num_of_handlers_reg = 0;
+ m_initialized = true;
+ m_pending_usr_evt_index = 0;
+ m_evt_handler = evt_handler;
+
+ return err_code;
+
+}
+
+
+uint32_t ble_db_discovery_close()
+{
+ m_num_of_handlers_reg = 0;
+ m_initialized = false;
+ m_pending_usr_evt_index = 0;
+
+ return NRF_SUCCESS;
+}
+
+
+uint32_t ble_db_discovery_evt_register(const ble_uuid_t * const p_uuid)
+{
+ VERIFY_PARAM_NOT_NULL(p_uuid);
+ VERIFY_MODULE_INITIALIZED();
+
+ return registered_handler_set(p_uuid, m_evt_handler);
+}
+
+
+uint32_t ble_db_discovery_start(ble_db_discovery_t * const p_db_discovery,
+ uint16_t conn_handle)
+{
+ VERIFY_PARAM_NOT_NULL(p_db_discovery);
+ VERIFY_MODULE_INITIALIZED();
+
+ if (m_num_of_handlers_reg == 0)
+ {
+ // No user modules were registered. There are no services to discover.
+ return NRF_ERROR_INVALID_STATE;
+ }
+
+ if (p_db_discovery->discovery_in_progress)
+ {
+ return NRF_ERROR_BUSY;
+ }
+
+ p_db_discovery->conn_handle = conn_handle;
+ ble_gatt_db_srv_t * p_srv_being_discovered;
+
+ m_pending_usr_evt_index = 0;
+
+ p_db_discovery->discoveries_count = 0;
+ p_db_discovery->curr_srv_ind = 0;
+
+ p_srv_being_discovered = &(p_db_discovery->services[p_db_discovery->curr_srv_ind]);
+
+ p_srv_being_discovered->srv_uuid = m_registered_handlers[p_db_discovery->curr_srv_ind];
+
+ DB_LOG("[DB]: Starting discovery of service with UUID 0x%x for Connection handle %d\r\n",
+ p_srv_being_discovered->srv_uuid.uuid, conn_handle);
+
+ uint32_t err_code;
+
+ err_code = sd_ble_gattc_primary_services_discover(conn_handle,
+ SRV_DISC_START_HANDLE,
+ &(p_srv_being_discovered->srv_uuid));
+ VERIFY_SUCCESS(err_code);
+ p_db_discovery->discovery_in_progress = true;
+
+ return NRF_SUCCESS;
+}
+
+
+/**@brief Function for handling disconnected event.
+ *
+ * @param[in] p_db_discovery Pointer to the DB Discovery structure.
+ * @param[in] p_ble_gattc_evt Pointer to the GAP event.
+ */
+static void on_disconnected(ble_db_discovery_t * const p_db_discovery,
+ const ble_gap_evt_t * const p_evt)
+{
+ if (p_evt->conn_handle == p_db_discovery->conn_handle)
+ {
+ p_db_discovery->discovery_in_progress = false;
+ }
+}
+
+
+void ble_db_discovery_on_ble_evt(ble_db_discovery_t * const p_db_discovery,
+ const ble_evt_t * const p_ble_evt)
+{
+ VERIFY_PARAM_NOT_NULL_VOID(p_db_discovery);
+ VERIFY_PARAM_NOT_NULL_VOID(p_ble_evt);
+ VERIFY_MODULE_INITIALIZED_VOID();
+
+ switch (p_ble_evt->header.evt_id)
+ {
+ case BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP:
+ on_primary_srv_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt));
+ break;
+
+ case BLE_GATTC_EVT_CHAR_DISC_RSP:
+ on_characteristic_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt));
+ break;
+
+ case BLE_GATTC_EVT_DESC_DISC_RSP:
+ on_descriptor_discovery_rsp(p_db_discovery, &(p_ble_evt->evt.gattc_evt));
+ break;
+
+ case BLE_GAP_EVT_DISCONNECTED:
+ on_disconnected(p_db_discovery, &(p_ble_evt->evt.gap_evt));
+ break;
+
+ default:
+ break;
+ }
+}
+