/** * Copyright (c) 2012 - 2017, 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 #include "nordic_common.h" #include "ble_l2cap.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 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 * p_ble_evt) { p_bps->conn_handle = p_ble_evt->evt.gatts_evt.conn_handle; } /**@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 * 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 * 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 * p_ble_evt) { ble_gatts_evt_write_t * 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 * p_ble_evt) { ble_gatts_evt_hvc_t * 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_bps_t * p_bps, ble_evt_t * p_ble_evt) { 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; } /**@brief Function for adding Blood Pressure Measurement characteristics. * * @param[in] p_bps Blood Pressure Service structure. * @param[in] p_bps_init Information needed to initialize the service. * * @return NRF_SUCCESS on success, otherwise an error code. */ static uint32_t bps_measurement_char_add(ble_bps_t * p_bps, const ble_bps_init_t * p_bps_init) { ble_gatts_char_md_t char_md; ble_gatts_attr_md_t cccd_md; ble_gatts_attr_t attr_char_value; ble_uuid_t ble_uuid; ble_gatts_attr_md_t attr_md; ble_bps_meas_t initial_bpm; uint8_t encoded_bpm[MAX_BPM_LEN]; memset(&cccd_md, 0, sizeof(cccd_md)); BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cccd_md.read_perm); cccd_md.vloc = BLE_GATTS_VLOC_STACK; cccd_md.write_perm = p_bps_init->bps_meas_attr_md.cccd_write_perm; memset(&char_md, 0, sizeof(char_md)); char_md.char_props.indicate = 1; char_md.p_char_user_desc = NULL; char_md.p_char_pf = NULL; char_md.p_user_desc_md = NULL; char_md.p_cccd_md = &cccd_md; char_md.p_sccd_md = NULL; BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_BLOOD_PRESSURE_MEASUREMENT_CHAR); memset(&attr_md, 0, sizeof(attr_md)); attr_md.vloc = BLE_GATTS_VLOC_STACK; attr_md.read_perm = p_bps_init->bps_meas_attr_md.read_perm; attr_md.write_perm = p_bps_init->bps_meas_attr_md.write_perm; attr_md.rd_auth = 0; attr_md.wr_auth = 0; attr_md.vlen = 1; memset(&attr_char_value, 0, sizeof(attr_char_value)); memset(&initial_bpm, 0, sizeof(initial_bpm)); attr_char_value.p_uuid = &ble_uuid; attr_char_value.p_attr_md = &attr_md; attr_char_value.init_len = bps_measurement_encode(p_bps, &initial_bpm, encoded_bpm); attr_char_value.init_offs = 0; attr_char_value.max_len = MAX_BPM_LEN; attr_char_value.p_value = encoded_bpm; return sd_ble_gatts_characteristic_add(p_bps->service_handle, &char_md, &attr_char_value, &p_bps->meas_handles); } /**@brief Function for adding Blood Pressure Feature characteristics. * * @param[in] p_bps Blood Pressure Service structure. * @param[in] p_bps_init Information needed to initialize the service. * * @return NRF_SUCCESS on success, otherwise an error code. */ static uint32_t bps_feature_char_add(ble_bps_t * p_bps, const ble_bps_init_t * p_bps_init) { ble_gatts_char_md_t char_md; ble_gatts_attr_t attr_char_value; ble_uuid_t ble_uuid; ble_gatts_attr_md_t attr_md; uint8_t init_value_encoded[2]; uint8_t init_value_len; memset(&char_md, 0, sizeof(char_md)); char_md.char_props.read = 1; char_md.p_char_user_desc = NULL; char_md.p_char_pf = NULL; char_md.p_user_desc_md = NULL; char_md.p_cccd_md = NULL; char_md.p_sccd_md = NULL; BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_BLOOD_PRESSURE_FEATURE_CHAR); memset(&attr_md, 0, sizeof(attr_md)); attr_md.vloc = BLE_GATTS_VLOC_STACK; attr_md.read_perm = p_bps_init->bps_feature_attr_md.read_perm; attr_md.write_perm = p_bps_init->bps_feature_attr_md.write_perm; attr_md.rd_auth = 0; attr_md.wr_auth = 0; attr_md.vlen = 0; memset(&attr_char_value, 0, sizeof(attr_char_value)); init_value_len = uint16_encode(p_bps_init->feature, init_value_encoded); attr_char_value.p_uuid = &ble_uuid; attr_char_value.p_attr_md = &attr_md; attr_char_value.init_len = init_value_len; attr_char_value.init_offs = 0; attr_char_value.max_len = init_value_len; attr_char_value.p_value = init_value_encoded; return sd_ble_gatts_characteristic_add(p_bps->service_handle, &char_md, &attr_char_value, &p_bps->feature_handles); } uint32_t ble_bps_init(ble_bps_t * p_bps, const ble_bps_init_t * p_bps_init) { uint32_t err_code; ble_uuid_t ble_uuid; // Initialize service structure p_bps->evt_handler = p_bps_init->evt_handler; 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 err_code = bps_measurement_char_add(p_bps, p_bps_init); if (err_code != NRF_SUCCESS) { return err_code; } // Add feature characteristic err_code = bps_feature_char_add(p_bps, p_bps_init); 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; uint16_t hvx_len; ble_gatts_hvx_params_t hvx_params; len = bps_measurement_encode(p_bps, p_bps_meas, encoded_bps_meas); hvx_len = len; memset(&hvx_params, 0, sizeof(hvx_params)); hvx_params.handle = p_bps->meas_handles.value_handle; hvx_params.type = BLE_GATT_HVX_INDICATION; hvx_params.offset = 0; hvx_params.p_len = &hvx_len; hvx_params.p_data = encoded_bps_meas; err_code = sd_ble_gatts_hvx(p_bps->conn_handle, &hvx_params); if ((err_code == NRF_SUCCESS) && (hvx_len != len)) { err_code = NRF_ERROR_DATA_SIZE; } } 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)