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This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /**@cond To Make Doxygen skip documentation generation for this file. * @{ */ #include "sdk_common.h" #if NRF_MODULE_ENABLED(BLE_HRS_C) #include "ble_hrs_c.h" #include "ble_db_discovery.h" #include "ble_types.h" #include "ble_gattc.h" #define NRF_LOG_MODULE_NAME ble_hrs_c #include "nrf_log.h" NRF_LOG_MODULE_REGISTER(); #define HRM_FLAG_MASK_HR_16BIT (0x01 << 0) /**< Bit mask used to extract the type of heart rate value. This is used to find if the received heart rate is a 16 bit value or an 8 bit value. */ #define HRM_FLAG_MASK_HR_RR_INT (0x01 << 4) /**< Bit mask used to extract the presence of RR_INTERVALS. This is used to find if the received measurement includes RR_INTERVALS. */ /**@brief Function for interception of the errors of GATTC and the BLE GATT Queue. * * @param[in] nrf_error Error code. * @param[in] p_ctx Parameter from the event handler. * @param[in] conn_handle Connection handle. */ static void gatt_error_handler(uint32_t nrf_error, void * p_ctx, uint16_t conn_handle) { ble_hrs_c_t * p_ble_hrs_c = (ble_hrs_c_t *)p_ctx; NRF_LOG_DEBUG("A GATT Client error has occurred on conn_handle: 0X%X", conn_handle); if (p_ble_hrs_c->error_handler != NULL) { p_ble_hrs_c->error_handler(nrf_error); } } /**@brief Function for handling Handle Value Notification received from the SoftDevice. * * @details This function uses the Handle Value Notification received from the SoftDevice * and checks whether it is a notification of the heart rate measurement from the peer. If * it is, this function decodes the heart rate measurement and sends it to the * application. * * @param[in] p_ble_hrs_c Pointer to the Heart Rate Client structure. * @param[in] p_ble_evt Pointer to the BLE event received. */ static void on_hvx(ble_hrs_c_t * p_ble_hrs_c, const ble_evt_t * p_ble_evt) { // Check if the event is on the link for this instance. if (p_ble_hrs_c->conn_handle != p_ble_evt->evt.gattc_evt.conn_handle) { NRF_LOG_DEBUG("Received HVX on link 0x%x, not associated to this instance. Ignore.", p_ble_evt->evt.gattc_evt.conn_handle); return; } NRF_LOG_DEBUG("Received HVX on link 0x%x, hrm_handle 0x%x", p_ble_evt->evt.gattc_evt.params.hvx.handle, p_ble_hrs_c->peer_hrs_db.hrm_handle); // Check if this is a heart rate notification. if (p_ble_evt->evt.gattc_evt.params.hvx.handle == p_ble_hrs_c->peer_hrs_db.hrm_handle) { ble_hrs_c_evt_t ble_hrs_c_evt; uint32_t index = 0; ble_hrs_c_evt.evt_type = BLE_HRS_C_EVT_HRM_NOTIFICATION; ble_hrs_c_evt.conn_handle = p_ble_hrs_c->conn_handle; ble_hrs_c_evt.params.hrm.rr_intervals_cnt = 0; if (!(p_ble_evt->evt.gattc_evt.params.hvx.data[index++] & HRM_FLAG_MASK_HR_16BIT)) { // 8-bit heart rate value received. ble_hrs_c_evt.params.hrm.hr_value = p_ble_evt->evt.gattc_evt.params.hvx.data[index++]; //lint !e415 suppress Lint Warning 415: Likely access out of bond } else { // 16-bit heart rate value received. ble_hrs_c_evt.params.hrm.hr_value = uint16_decode(&(p_ble_evt->evt.gattc_evt.params.hvx.data[index])); index += sizeof(uint16_t); } if ((p_ble_evt->evt.gattc_evt.params.hvx.data[0] & HRM_FLAG_MASK_HR_RR_INT)) { uint32_t i; /*lint --e{415} --e{416} --e{662} --e{661} -save suppress Warning 415: possible access out of bond */ for (i = 0; i < BLE_HRS_C_RR_INTERVALS_MAX_CNT; i ++) { if (index >= p_ble_evt->evt.gattc_evt.params.hvx.len) { break; } ble_hrs_c_evt.params.hrm.rr_intervals[i] = uint16_decode(&(p_ble_evt->evt.gattc_evt.params.hvx.data[index])); index += sizeof(uint16_t); } /*lint -restore*/ ble_hrs_c_evt.params.hrm.rr_intervals_cnt = (uint8_t)i; } p_ble_hrs_c->evt_handler(p_ble_hrs_c, &ble_hrs_c_evt); } } /**@brief Function for handling Disconnected event received from the SoftDevice. * * @details This function checks whether the disconnect event is happening on the link * associated with the current instance of the module. If the event is happening, the function sets the instance's * conn_handle to invalid. * * @param[in] p_ble_hrs_c Pointer to the Heart Rate Client structure. * @param[in] p_ble_evt Pointer to the BLE event received. */ static void on_disconnected(ble_hrs_c_t * p_ble_hrs_c, const ble_evt_t * p_ble_evt) { if (p_ble_hrs_c->conn_handle == p_ble_evt->evt.gap_evt.conn_handle) { p_ble_hrs_c->conn_handle = BLE_CONN_HANDLE_INVALID; p_ble_hrs_c->peer_hrs_db.hrm_cccd_handle = BLE_GATT_HANDLE_INVALID; p_ble_hrs_c->peer_hrs_db.hrm_handle = BLE_GATT_HANDLE_INVALID; } } void ble_hrs_on_db_disc_evt(ble_hrs_c_t * p_ble_hrs_c, const ble_db_discovery_evt_t * p_evt) { // Check if the Heart Rate Service was discovered. if (p_evt->evt_type == BLE_DB_DISCOVERY_COMPLETE && p_evt->params.discovered_db.srv_uuid.uuid == BLE_UUID_HEART_RATE_SERVICE && p_evt->params.discovered_db.srv_uuid.type == BLE_UUID_TYPE_BLE) { // Find the CCCD Handle of the Heart Rate Measurement characteristic. uint32_t i; ble_hrs_c_evt_t evt; evt.evt_type = BLE_HRS_C_EVT_DISCOVERY_COMPLETE; evt.conn_handle = p_evt->conn_handle; for (i = 0; i < p_evt->params.discovered_db.char_count; i++) { if (p_evt->params.discovered_db.charateristics[i].characteristic.uuid.uuid == BLE_UUID_HEART_RATE_MEASUREMENT_CHAR) { // Found Heart Rate characteristic. Store CCCD handle and break. evt.params.peer_db.hrm_cccd_handle = p_evt->params.discovered_db.charateristics[i].cccd_handle; evt.params.peer_db.hrm_handle = p_evt->params.discovered_db.charateristics[i].characteristic.handle_value; break; } } NRF_LOG_DEBUG("Heart Rate Service discovered at peer."); //If the instance has been assigned prior to db_discovery, assign the db_handles. if (p_ble_hrs_c->conn_handle != BLE_CONN_HANDLE_INVALID) { if ((p_ble_hrs_c->peer_hrs_db.hrm_cccd_handle == BLE_GATT_HANDLE_INVALID)&& (p_ble_hrs_c->peer_hrs_db.hrm_handle == BLE_GATT_HANDLE_INVALID)) { p_ble_hrs_c->peer_hrs_db = evt.params.peer_db; } } p_ble_hrs_c->evt_handler(p_ble_hrs_c, &evt); } } uint32_t ble_hrs_c_init(ble_hrs_c_t * p_ble_hrs_c, ble_hrs_c_init_t * p_ble_hrs_c_init) { VERIFY_PARAM_NOT_NULL(p_ble_hrs_c); VERIFY_PARAM_NOT_NULL(p_ble_hrs_c_init); ble_uuid_t hrs_uuid; hrs_uuid.type = BLE_UUID_TYPE_BLE; hrs_uuid.uuid = BLE_UUID_HEART_RATE_SERVICE; p_ble_hrs_c->evt_handler = p_ble_hrs_c_init->evt_handler; p_ble_hrs_c->error_handler = p_ble_hrs_c_init->error_handler; p_ble_hrs_c->p_gatt_queue = p_ble_hrs_c_init->p_gatt_queue; p_ble_hrs_c->conn_handle = BLE_CONN_HANDLE_INVALID; p_ble_hrs_c->peer_hrs_db.hrm_cccd_handle = BLE_GATT_HANDLE_INVALID; p_ble_hrs_c->peer_hrs_db.hrm_handle = BLE_GATT_HANDLE_INVALID; return ble_db_discovery_evt_register(&hrs_uuid); } void ble_hrs_c_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context) { ble_hrs_c_t * p_ble_hrs_c = (ble_hrs_c_t *)p_context; if ((p_ble_hrs_c == NULL) || (p_ble_evt == NULL)) { return; } switch (p_ble_evt->header.evt_id) { case BLE_GATTC_EVT_HVX: on_hvx(p_ble_hrs_c, p_ble_evt); break; case BLE_GAP_EVT_DISCONNECTED: on_disconnected(p_ble_hrs_c, p_ble_evt); break; default: break; } } /**@brief Function for creating a message for writing to the CCCD. */ static uint32_t cccd_configure(ble_hrs_c_t * p_ble_hrs_c, bool enable) { NRF_LOG_DEBUG("Configuring CCCD. CCCD Handle = %d, Connection Handle = %d", p_ble_hrs_c->peer_hrs_db.hrm_cccd_handle, p_ble_hrs_c->conn_handle); nrf_ble_gq_req_t hrs_c_req; uint8_t cccd[BLE_CCCD_VALUE_LEN]; uint16_t cccd_val = enable ? BLE_GATT_HVX_NOTIFICATION : 0; cccd[0] = LSB_16(cccd_val); cccd[1] = MSB_16(cccd_val); memset(&hrs_c_req, 0, sizeof(hrs_c_req)); hrs_c_req.type = NRF_BLE_GQ_REQ_GATTC_WRITE; hrs_c_req.error_handler.cb = gatt_error_handler; hrs_c_req.error_handler.p_ctx = p_ble_hrs_c; hrs_c_req.params.gattc_write.handle = p_ble_hrs_c->peer_hrs_db.hrm_cccd_handle; hrs_c_req.params.gattc_write.len = BLE_CCCD_VALUE_LEN; hrs_c_req.params.gattc_write.p_value = cccd; hrs_c_req.params.gattc_write.write_op = BLE_GATT_OP_WRITE_REQ; return nrf_ble_gq_item_add(p_ble_hrs_c->p_gatt_queue, &hrs_c_req, p_ble_hrs_c->conn_handle); } uint32_t ble_hrs_c_hrm_notif_enable(ble_hrs_c_t * p_ble_hrs_c) { VERIFY_PARAM_NOT_NULL(p_ble_hrs_c); return cccd_configure(p_ble_hrs_c, true); } uint32_t ble_hrs_c_handles_assign(ble_hrs_c_t * p_ble_hrs_c, uint16_t conn_handle, const hrs_db_t * p_peer_hrs_handles) { VERIFY_PARAM_NOT_NULL(p_ble_hrs_c); p_ble_hrs_c->conn_handle = conn_handle; if (p_peer_hrs_handles != NULL) { p_ble_hrs_c->peer_hrs_db = *p_peer_hrs_handles; } return nrf_ble_gq_conn_handle_register(p_ble_hrs_c->p_gatt_queue, conn_handle); } /** @} * @endcond */ #endif // NRF_MODULE_ENABLED(BLE_HRS_C)