/** * Copyright (c) 2012 - 2020, Nordic Semiconductor ASA * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. 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. * */ #include "sdk_common.h" #if NRF_MODULE_ENABLED(BLE_BAS_C) #include "ble_bas_c.h" #include "ble_types.h" #include "ble_db_discovery.h" #include "ble_gattc.h" #define NRF_LOG_MODULE_NAME ble_bas_c #include "nrf_log.h" NRF_LOG_MODULE_REGISTER(); /**@brief Function for intercepting errors of GATTC and 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_bas_c_t * p_bas_c = (ble_bas_c_t *)p_ctx; NRF_LOG_DEBUG("A GATT Client error has occurred on conn_handle: 0X%X", conn_handle); if (p_bas_c->error_handler != NULL) { p_bas_c->error_handler(nrf_error); } } /**@brief Function for handling read response events. * * @details This function validates the read response and raises the appropriate * event to the application. * * @param[in] p_bas_c Pointer to the Battery Service Client Structure. * @param[in] p_ble_evt Pointer to the SoftDevice event. */ static void on_read_rsp(ble_bas_c_t * p_bas_c, ble_evt_t const * p_ble_evt) { const ble_gattc_evt_read_rsp_t * p_response; // Check if the event is on the link for this instance. if (p_bas_c->conn_handle != p_ble_evt->evt.gattc_evt.conn_handle) { return; } p_response = &p_ble_evt->evt.gattc_evt.params.read_rsp; if (p_response->handle == p_bas_c->peer_bas_db.bl_handle) { ble_bas_c_evt_t evt; evt.conn_handle = p_ble_evt->evt.gattc_evt.conn_handle; evt.evt_type = BLE_BAS_C_EVT_BATT_READ_RESP; evt.params.battery_level = p_response->data[0]; p_bas_c->evt_handler(p_bas_c, &evt); } } /**@brief Function for handling Handle Value Notification received from the SoftDevice. * * @details This function handles the Handle Value Notification received from the SoftDevice * and checks whether it is a notification of the Battery Level measurement from the peer. If * it is, this function decodes the battery level measurement and sends it to the * application. * * @param[in] p_ble_bas_c Pointer to the Battery Service Client structure. * @param[in] p_ble_evt Pointer to the BLE event received. */ static void on_hvx(ble_bas_c_t * p_ble_bas_c, ble_evt_t const * p_ble_evt) { // Check if the event is on the link for this instance. if (p_ble_bas_c->conn_handle != p_ble_evt->evt.gattc_evt.conn_handle) { return; } // Check if this notification is a battery level notification. if (p_ble_evt->evt.gattc_evt.params.hvx.handle == p_ble_bas_c->peer_bas_db.bl_handle) { if (p_ble_evt->evt.gattc_evt.params.hvx.len == 1) { ble_bas_c_evt_t ble_bas_c_evt; ble_bas_c_evt.conn_handle = p_ble_evt->evt.gattc_evt.conn_handle; ble_bas_c_evt.evt_type = BLE_BAS_C_EVT_BATT_NOTIFICATION; ble_bas_c_evt.params.battery_level = p_ble_evt->evt.gattc_evt.params.hvx.data[0]; p_ble_bas_c->evt_handler(p_ble_bas_c, &ble_bas_c_evt); } } } void ble_bas_on_db_disc_evt(ble_bas_c_t * p_ble_bas_c, const ble_db_discovery_evt_t * p_evt) { // Check if the Battery Service was discovered. if (p_evt->evt_type == BLE_DB_DISCOVERY_COMPLETE && p_evt->params.discovered_db.srv_uuid.uuid == BLE_UUID_BATTERY_SERVICE && p_evt->params.discovered_db.srv_uuid.type == BLE_UUID_TYPE_BLE) { // Find the CCCD Handle of the Battery Level characteristic. uint8_t i; ble_bas_c_evt_t evt; evt.evt_type = BLE_BAS_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_BATTERY_LEVEL_CHAR) { // Found Battery Level characteristic. Store CCCD handle and break. evt.params.bas_db.bl_cccd_handle = p_evt->params.discovered_db.charateristics[i].cccd_handle; evt.params.bas_db.bl_handle = p_evt->params.discovered_db.charateristics[i].characteristic.handle_value; break; } } NRF_LOG_DEBUG("Battery Service discovered at peer."); //If the instance has been assigned prior to db_discovery, assign the db_handles. if (p_ble_bas_c->conn_handle != BLE_CONN_HANDLE_INVALID) { if ((p_ble_bas_c->peer_bas_db.bl_cccd_handle == BLE_GATT_HANDLE_INVALID)&& (p_ble_bas_c->peer_bas_db.bl_handle == BLE_GATT_HANDLE_INVALID)) { p_ble_bas_c->peer_bas_db = evt.params.bas_db; } } p_ble_bas_c->evt_handler(p_ble_bas_c, &evt); } else if ((p_evt->evt_type == BLE_DB_DISCOVERY_SRV_NOT_FOUND) || (p_evt->evt_type == BLE_DB_DISCOVERY_ERROR)) { NRF_LOG_DEBUG("Battery Service discovery failure at peer. "); } else { // Do nothing. } } /**@brief Function for creating a message for writing to the CCCD. */ static uint32_t cccd_configure(ble_bas_c_t * p_ble_bas_c, bool notification_enable) { NRF_LOG_DEBUG("Configuring CCCD. CCCD Handle = %d, Connection Handle = %d", p_ble_bas_c->peer_bas_db.bl_cccd_handle, p_ble_bas_c->conn_handle); nrf_ble_gq_req_t bas_c_req; uint8_t cccd[BLE_CCCD_VALUE_LEN]; uint16_t cccd_val = notification_enable ? BLE_GATT_HVX_NOTIFICATION : 0; cccd[0] = LSB_16(cccd_val); cccd[1] = MSB_16(cccd_val); memset(&bas_c_req, 0, sizeof(bas_c_req)); bas_c_req.type = NRF_BLE_GQ_REQ_GATTC_WRITE; bas_c_req.error_handler.cb = gatt_error_handler; bas_c_req.error_handler.p_ctx = p_ble_bas_c; bas_c_req.params.gattc_write.handle = p_ble_bas_c->peer_bas_db.bl_cccd_handle; bas_c_req.params.gattc_write.len = BLE_CCCD_VALUE_LEN; bas_c_req.params.gattc_write.p_value = cccd; bas_c_req.params.gattc_write.offset = 0; bas_c_req.params.gattc_write.write_op = BLE_GATT_OP_WRITE_REQ; return nrf_ble_gq_item_add(p_ble_bas_c->p_gatt_queue, &bas_c_req, p_ble_bas_c->conn_handle); } uint32_t ble_bas_c_init(ble_bas_c_t * p_ble_bas_c, ble_bas_c_init_t * p_ble_bas_c_init) { VERIFY_PARAM_NOT_NULL(p_ble_bas_c); VERIFY_PARAM_NOT_NULL(p_ble_bas_c_init); ble_uuid_t bas_uuid; bas_uuid.type = BLE_UUID_TYPE_BLE; bas_uuid.uuid = BLE_UUID_BATTERY_SERVICE; p_ble_bas_c->conn_handle = BLE_CONN_HANDLE_INVALID; p_ble_bas_c->peer_bas_db.bl_cccd_handle = BLE_GATT_HANDLE_INVALID; p_ble_bas_c->peer_bas_db.bl_handle = BLE_GATT_HANDLE_INVALID; p_ble_bas_c->evt_handler = p_ble_bas_c_init->evt_handler; p_ble_bas_c->error_handler = p_ble_bas_c_init->error_handler; p_ble_bas_c->p_gatt_queue = p_ble_bas_c_init->p_gatt_queue; return ble_db_discovery_evt_register(&bas_uuid); } /**@brief Function for handling the 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_bas_c Pointer to the Battery Service Client structure. * @param[in] p_ble_evt Pointer to the BLE event received. */ static void on_disconnected(ble_bas_c_t * p_ble_bas_c, const ble_evt_t * p_ble_evt) { if (p_ble_bas_c->conn_handle == p_ble_evt->evt.gap_evt.conn_handle) { p_ble_bas_c->conn_handle = BLE_CONN_HANDLE_INVALID; p_ble_bas_c->peer_bas_db.bl_cccd_handle = BLE_GATT_HANDLE_INVALID; p_ble_bas_c->peer_bas_db.bl_handle = BLE_GATT_HANDLE_INVALID; } } void ble_bas_c_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context) { if ((p_ble_evt == NULL) || (p_context == NULL)) { return; } ble_bas_c_t * p_ble_bas_c = (ble_bas_c_t *)p_context; switch (p_ble_evt->header.evt_id) { case BLE_GATTC_EVT_HVX: on_hvx(p_ble_bas_c, p_ble_evt); break; case BLE_GATTC_EVT_READ_RSP: on_read_rsp(p_ble_bas_c, p_ble_evt); break; case BLE_GAP_EVT_DISCONNECTED: on_disconnected(p_ble_bas_c, p_ble_evt); break; default: break; } } uint32_t ble_bas_c_bl_notif_enable(ble_bas_c_t * p_ble_bas_c) { VERIFY_PARAM_NOT_NULL(p_ble_bas_c); if (p_ble_bas_c->conn_handle == BLE_CONN_HANDLE_INVALID) { return NRF_ERROR_INVALID_STATE; } return cccd_configure(p_ble_bas_c, true); } uint32_t ble_bas_c_bl_read(ble_bas_c_t * p_ble_bas_c) { VERIFY_PARAM_NOT_NULL(p_ble_bas_c); if (p_ble_bas_c->conn_handle == BLE_CONN_HANDLE_INVALID) { return NRF_ERROR_INVALID_STATE; } nrf_ble_gq_req_t bas_c_req; memset(&bas_c_req, 0, sizeof(bas_c_req)); bas_c_req.type = NRF_BLE_GQ_REQ_GATTC_READ; bas_c_req.error_handler.cb = gatt_error_handler; bas_c_req.error_handler.p_ctx = p_ble_bas_c; bas_c_req.params.gattc_read.handle = p_ble_bas_c->peer_bas_db.bl_handle; return nrf_ble_gq_item_add(p_ble_bas_c->p_gatt_queue, &bas_c_req, p_ble_bas_c->conn_handle); } uint32_t ble_bas_c_handles_assign(ble_bas_c_t * p_ble_bas_c, uint16_t conn_handle, ble_bas_c_db_t * p_peer_handles) { VERIFY_PARAM_NOT_NULL(p_ble_bas_c); p_ble_bas_c->conn_handle = conn_handle; if (p_peer_handles != NULL) { p_ble_bas_c->peer_bas_db = *p_peer_handles; } return nrf_ble_gq_conn_handle_register(p_ble_bas_c->p_gatt_queue, conn_handle); } #endif // NRF_MODULE_ENABLED(BLE_BAS_C)