/** * 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. * */ /* Attention! * To maintain compliance with Nordic Semiconductor ASA's Bluetooth profile * qualification listings, this section of source code must not be modified. */ #include "sdk_common.h" #if NRF_MODULE_ENABLED(BLE_BPS) #include "ble_bps.h" #include "ble_err.h" #include #include "nordic_common.h" #include "ble_srv_common.h" #define OPCODE_LENGTH 1 /**< Length of opcode inside Blood Pressure Measurement packet. */ #define HANDLE_LENGTH 2 /**< Length of handle inside Blood Pressure Measurement packet. */ #define MAX_BPM_LEN (BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH) /**< Maximum size of a transmitted Blood Pressure Measurement. */ // Blood Pressure Measurement Flags bits #define BPS_MEAS_BLOOD_PRESSURE_UNITS_FLAG_BIT (0x01 << 0) /**< Blood Pressure Units Flag bit. */ #define BPS_MEAS_TIME_STAMP_FLAG_BIT (0x01 << 1) /**< Time Stamp Flag bit. */ #define BPS_MEAS_PULSE_RATE_FLAG_BIT (0x01 << 2) /**< Pulse Rate Flag bit. */ #define BPS_MEAS_USER_ID_FLAG_BIT (0x01 << 3) /**< User ID Flag bit. */ #define BPS_MEAS_MEASUREMENT_STATUS_FLAG_BIT (0x01 << 4) /**< Measurement Status Flag bit. */ /**@brief Function for interception of GATT errors and @ref nrf_ble_gq errors. * * @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_bps_t * p_bps = (ble_bps_t *)p_ctx; if (p_bps->error_handler != NULL) { p_bps->error_handler(nrf_error); } } /**@brief Function for handling the Connect event. * * @param[in] p_bps Blood Pressure Service structure. * @param[in] p_ble_evt Event received from the BLE stack. */ static void on_connect(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt) { ret_code_t err_code; p_bps->conn_handle = p_ble_evt->evt.gap_evt.conn_handle; err_code = nrf_ble_gq_conn_handle_register(p_bps->p_gatt_queue, p_ble_evt->evt.gap_evt.conn_handle); if ((p_bps->error_handler != NULL) && (err_code != NRF_SUCCESS)) { p_bps->error_handler(err_code); } } /**@brief Function for handling the Disconnect event. * * @param[in] p_bps Blood Pressure Service structure. * @param[in] p_ble_evt Event received from the BLE stack. */ static void on_disconnect(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt) { UNUSED_PARAMETER(p_ble_evt); p_bps->conn_handle = BLE_CONN_HANDLE_INVALID; } /**@brief Function for handling the write events to the Blood Pressure Measurement characteristic. * * @param[in] p_bps Blood Pressure Service structure. * @param[in] p_evt_write Write event received from the BLE stack. */ static void on_cccd_write(ble_bps_t * p_bps, ble_gatts_evt_write_t const * p_evt_write) { if (p_evt_write->len == 2) { // CCCD written, update indication state if (p_bps->evt_handler != NULL) { ble_bps_evt_t evt; if (ble_srv_is_indication_enabled(p_evt_write->data)) { evt.evt_type = BLE_BPS_EVT_INDICATION_ENABLED; } else { evt.evt_type = BLE_BPS_EVT_INDICATION_DISABLED; } p_bps->evt_handler(p_bps, &evt); } } } /**@brief Function for handling the Write event. * * @param[in] p_bps Blood Pressure Service structure. * @param[in] p_ble_evt Event received from the BLE stack. */ static void on_write(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt) { ble_gatts_evt_write_t const * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write; if (p_evt_write->handle == p_bps->meas_handles.cccd_handle) { on_cccd_write(p_bps, p_evt_write); } } /**@brief Function for handling the HVC event. * * @details Handles HVC events from the BLE stack. * * @param[in] p_bps Blood Pressure Service structure. * @param[in] p_ble_evt Event received from the BLE stack. */ static void on_hvc(ble_bps_t * p_bps, ble_evt_t const * p_ble_evt) { ble_gatts_evt_hvc_t const * p_hvc = &p_ble_evt->evt.gatts_evt.params.hvc; if (p_hvc->handle == p_bps->meas_handles.value_handle) { ble_bps_evt_t evt; evt.evt_type = BLE_BPS_EVT_INDICATION_CONFIRMED; p_bps->evt_handler(p_bps, &evt); } } void ble_bps_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context) { ble_bps_t * p_bps = (ble_bps_t *)p_context; switch (p_ble_evt->header.evt_id) { case BLE_GAP_EVT_CONNECTED: on_connect(p_bps, p_ble_evt); break; case BLE_GAP_EVT_DISCONNECTED: on_disconnect(p_bps, p_ble_evt); break; case BLE_GATTS_EVT_WRITE: on_write(p_bps, p_ble_evt); break; case BLE_GATTS_EVT_HVC: on_hvc(p_bps, p_ble_evt); break; default: // No implementation needed. break; } } /**@brief Function for encoding a Blood Pressure Measurement. * * @param[in] p_bps Blood Pressure Service structure. * @param[in] p_bps_meas Measurement to be encoded. * @param[out] p_encoded_buffer Buffer where the encoded data will be written. * * @return Size of encoded data. */ static uint8_t bps_measurement_encode(ble_bps_t * p_bps, ble_bps_meas_t * p_bps_meas, uint8_t * p_encoded_buffer) { uint8_t flags = 0; uint8_t len = 1; uint16_t encoded_sfloat; // Set measurement units flag if (p_bps_meas->blood_pressure_units_in_kpa) { flags |= BPS_MEAS_BLOOD_PRESSURE_UNITS_FLAG_BIT; } // Blood Pressure Measurement - Systolic encoded_sfloat = ((p_bps_meas->blood_pressure_systolic.exponent << 12) & 0xF000) | ((p_bps_meas->blood_pressure_systolic.mantissa << 0) & 0x0FFF); len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]); // Blood Pressure Measurement - Diastolic encoded_sfloat = ((p_bps_meas->blood_pressure_diastolic.exponent << 12) & 0xF000) | ((p_bps_meas->blood_pressure_diastolic.mantissa << 0) & 0x0FFF); len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]); // Blood Pressure Measurement - Mean Arterial Pressure encoded_sfloat = ((p_bps_meas->mean_arterial_pressure.exponent << 12) & 0xF000) | ((p_bps_meas->mean_arterial_pressure.mantissa << 0) & 0x0FFF); len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]); // Time Stamp field if (p_bps_meas->time_stamp_present) { flags |= BPS_MEAS_TIME_STAMP_FLAG_BIT; len += ble_date_time_encode(&p_bps_meas->time_stamp, &p_encoded_buffer[len]); } // Pulse Rate if (p_bps_meas->pulse_rate_present) { flags |= BPS_MEAS_PULSE_RATE_FLAG_BIT; encoded_sfloat = ((p_bps_meas->pulse_rate.exponent << 12) & 0xF000) | ((p_bps_meas->pulse_rate.mantissa << 0) & 0x0FFF); len += uint16_encode(encoded_sfloat, &p_encoded_buffer[len]); } // User ID if (p_bps_meas->user_id_present) { flags |= BPS_MEAS_USER_ID_FLAG_BIT; p_encoded_buffer[len++] = p_bps_meas->user_id; } // Measurement Status if (p_bps_meas->measurement_status_present) { flags |= BPS_MEAS_MEASUREMENT_STATUS_FLAG_BIT; len += uint16_encode(p_bps_meas->measurement_status, &p_encoded_buffer[len]); } // Flags field p_encoded_buffer[0] = flags; return len; } uint32_t ble_bps_init(ble_bps_t * p_bps, ble_bps_init_t const * p_bps_init) { VERIFY_PARAM_NOT_NULL(p_bps); VERIFY_PARAM_NOT_NULL(p_bps_init); VERIFY_PARAM_NOT_NULL(p_bps_init->p_gatt_queue); uint32_t err_code; uint8_t init_value_encoded[MAX_BPM_LEN]; uint8_t initial_feature_len; ble_bps_meas_t initial_bpm; ble_uuid_t ble_uuid; ble_add_char_params_t add_char_params; // Initialize service structure p_bps->evt_handler = p_bps_init->evt_handler; p_bps->error_handler = p_bps_init->error_handler; p_bps->p_gatt_queue = p_bps_init->p_gatt_queue; p_bps->conn_handle = BLE_CONN_HANDLE_INVALID; p_bps->feature = p_bps_init->feature; // Add service BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_BLOOD_PRESSURE_SERVICE); err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &ble_uuid, &p_bps->service_handle); if (err_code != NRF_SUCCESS) { return err_code; } // Add measurement characteristic memset(&initial_bpm, 0, sizeof(initial_bpm)); memset(&add_char_params, 0, sizeof(add_char_params)); add_char_params.uuid = BLE_UUID_BLOOD_PRESSURE_MEASUREMENT_CHAR; add_char_params.max_len = MAX_BPM_LEN; add_char_params.is_var_len = true; add_char_params.init_len = bps_measurement_encode(p_bps, &initial_bpm, init_value_encoded); add_char_params.p_init_value = init_value_encoded; add_char_params.char_props.indicate = 1; add_char_params.cccd_write_access = p_bps_init->bp_cccd_wr_sec; err_code = characteristic_add(p_bps->service_handle, &add_char_params, &p_bps->meas_handles); if (err_code != NRF_SUCCESS) { return err_code; } // Add feature characteristic initial_feature_len = uint16_encode(p_bps_init->feature, init_value_encoded); memset(&add_char_params, 0, sizeof(add_char_params)); add_char_params.uuid = BLE_UUID_BLOOD_PRESSURE_FEATURE_CHAR; add_char_params.max_len = initial_feature_len; add_char_params.init_len = initial_feature_len; add_char_params.p_init_value = init_value_encoded; add_char_params.char_props.read = 1; add_char_params.read_access = p_bps_init->bp_feature_rd_sec; err_code = characteristic_add(p_bps->service_handle, &add_char_params, &p_bps->feature_handles); if (err_code != NRF_SUCCESS) { return err_code; } return NRF_SUCCESS; } uint32_t ble_bps_measurement_send(ble_bps_t * p_bps, ble_bps_meas_t * p_bps_meas) { uint32_t err_code; // Send value if connected if (p_bps->conn_handle != BLE_CONN_HANDLE_INVALID) { uint8_t encoded_bps_meas[MAX_BPM_LEN]; uint16_t len; nrf_ble_gq_req_t bps_req; len = bps_measurement_encode(p_bps, p_bps_meas, encoded_bps_meas); memset(&bps_req, 0, sizeof(nrf_ble_gq_req_t)); bps_req.type = NRF_BLE_GQ_REQ_GATTS_HVX; bps_req.error_handler.cb = gatt_error_handler; bps_req.error_handler.p_ctx = p_bps; bps_req.params.gatts_hvx.handle = p_bps->meas_handles.value_handle; bps_req.params.gatts_hvx.offset = 0; bps_req.params.gatts_hvx.p_data = encoded_bps_meas; bps_req.params.gatts_hvx.p_len = &len; bps_req.params.gatts_hvx.type = BLE_GATT_HVX_INDICATION; err_code = nrf_ble_gq_item_add(p_bps->p_gatt_queue, &bps_req, p_bps->conn_handle); } else { err_code = NRF_ERROR_INVALID_STATE; } return err_code; } uint32_t ble_bps_is_indication_enabled(ble_bps_t * p_bps, bool * p_indication_enabled) { uint32_t err_code; uint8_t cccd_value_buf[BLE_CCCD_VALUE_LEN]; ble_gatts_value_t gatts_value; // Initialize value struct. memset(&gatts_value, 0, sizeof(gatts_value)); gatts_value.len = BLE_CCCD_VALUE_LEN; gatts_value.offset = 0; gatts_value.p_value = cccd_value_buf; err_code = sd_ble_gatts_value_get(p_bps->conn_handle, p_bps->meas_handles.cccd_handle, &gatts_value); if (err_code == NRF_SUCCESS) { *p_indication_enabled = ble_srv_is_indication_enabled(cccd_value_buf); } if (err_code == BLE_ERROR_GATTS_SYS_ATTR_MISSING) { *p_indication_enabled = false; return NRF_SUCCESS; } return err_code; } #endif // NRF_MODULE_ENABLED(BLE_BPS)