405 lines
13 KiB
C
405 lines
13 KiB
C
/**
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* Copyright (c) 2012 - 2020, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/* Attention!
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* To maintain compliance with Nordic Semiconductor ASA's Bluetooth profile
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* qualification listings, this section of source code must not be modified.
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*/
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#include "sdk_common.h"
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#if NRF_MODULE_ENABLED(BLE_HTS)
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#include "ble_err.h"
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#include "ble_hts.h"
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#include <string.h>
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#include "ble_srv_common.h"
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#define OPCODE_LENGTH 1 /**< Length of opcode inside Health Thermometer Measurement packet. */
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#define HANDLE_LENGTH 2 /**< Length of handle inside Health Thermometer Measurement packet. */
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#define MAX_HTM_LEN (BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH) /**< Maximum size of a transmitted Health Thermometer Measurement. */
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// Health Thermometer Measurement flag bits
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#define HTS_MEAS_FLAG_TEMP_UNITS_BIT (0x01 << 0) /**< Temperature Units flag. */
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#define HTS_MEAS_FLAG_TIME_STAMP_BIT (0x01 << 1) /**< Time Stamp flag. */
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#define HTS_MEAS_FLAG_TEMP_TYPE_BIT (0x01 << 2) /**< Temperature Type flag. */
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/**@brief Function for interception of GATT errors and @ref nrf_ble_gq errors.
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*
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* @param[in] nrf_error Error code.
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* @param[in] p_ctx Parameter from the event handler.
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* @param[in] conn_handle Connection handle.
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*/
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static void gatt_error_handler(uint32_t nrf_error,
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void * p_ctx,
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uint16_t conn_handle)
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{
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ble_hts_t * p_hts = (ble_hts_t *)p_ctx;
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if (p_hts->error_handler != NULL)
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{
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p_hts->error_handler(nrf_error);
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}
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}
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/**@brief Function for handling the Connect event.
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*
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* @param[in] p_hts Health Thermometer Service structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_connect(ble_hts_t * p_hts, ble_evt_t const * p_ble_evt)
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{
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ret_code_t err_code;
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p_hts->conn_handle = p_ble_evt->evt.gatts_evt.conn_handle;
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err_code = nrf_ble_gq_conn_handle_register(p_hts->p_gatt_queue, p_hts->conn_handle);
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if ((p_hts->error_handler != NULL) &&
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(err_code != NRF_SUCCESS))
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{
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p_hts->error_handler(err_code);
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}
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}
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/**@brief Function for handling the Disconnect event.
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*
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* @param[in] p_hts Health Thermometer Service structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_disconnect(ble_hts_t * p_hts, ble_evt_t const * p_ble_evt)
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{
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UNUSED_PARAMETER(p_ble_evt);
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p_hts->conn_handle = BLE_CONN_HANDLE_INVALID;
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}
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/**@brief Function for handling write events to the Blood Pressure Measurement characteristic.
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*
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* @param[in] p_hts Health Thermometer Service structure.
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* @param[in] p_evt_write Write event received from the BLE stack.
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*/
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static void on_cccd_write(ble_hts_t * p_hts, ble_gatts_evt_write_t const * p_evt_write)
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{
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if (p_evt_write->len == 2)
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{
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// CCCD written, update indication state
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if (p_hts->evt_handler != NULL)
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{
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ble_hts_evt_t evt;
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if (ble_srv_is_indication_enabled(p_evt_write->data))
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{
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evt.evt_type = BLE_HTS_EVT_INDICATION_ENABLED;
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}
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else
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{
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evt.evt_type = BLE_HTS_EVT_INDICATION_DISABLED;
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}
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p_hts->evt_handler(p_hts, &evt);
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}
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}
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}
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/**@brief Function for handling the Write event.
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*
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* @param[in] p_hts Health Thermometer Service structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_write(ble_hts_t * p_hts, ble_evt_t const * p_ble_evt)
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{
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ble_gatts_evt_write_t const * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;
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if (p_evt_write->handle == p_hts->meas_handles.cccd_handle)
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{
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on_cccd_write(p_hts, p_evt_write);
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}
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}
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/**@brief Function for handling the HVC event.
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*
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* @details Handles HVC events from the BLE stack.
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*
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* @param[in] p_hts Health Thermometer Service structure.
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* @param[in] p_ble_evt Event received from the BLE stack.
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*/
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static void on_hvc(ble_hts_t * p_hts, ble_evt_t const * p_ble_evt)
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{
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ble_gatts_evt_hvc_t const * p_hvc = &p_ble_evt->evt.gatts_evt.params.hvc;
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if (p_hvc->handle == p_hts->meas_handles.value_handle)
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{
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ble_hts_evt_t evt;
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evt.evt_type = BLE_HTS_EVT_INDICATION_CONFIRMED;
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p_hts->evt_handler(p_hts, &evt);
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}
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}
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void ble_hts_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
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{
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ble_hts_t * p_hts = (ble_hts_t *)p_context;
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switch (p_ble_evt->header.evt_id)
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{
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case BLE_GAP_EVT_CONNECTED:
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on_connect(p_hts, p_ble_evt);
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break;
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case BLE_GAP_EVT_DISCONNECTED:
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on_disconnect(p_hts, p_ble_evt);
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break;
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case BLE_GATTS_EVT_WRITE:
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on_write(p_hts, p_ble_evt);
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break;
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case BLE_GATTS_EVT_HVC:
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on_hvc(p_hts, p_ble_evt);
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break;
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default:
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// No implementation needed.
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break;
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}
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}
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/**@brief Function for encoding a Health Thermometer Measurement.
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*
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* @param[in] p_hts Health Thermometer Service structure.
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* @param[in] p_hts_meas Measurement to be encoded.
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* @param[out] p_encoded_buffer Buffer where the encoded data will be written.
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*
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* @return Size of encoded data.
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*/
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static uint8_t hts_measurement_encode(ble_hts_t * p_hts,
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ble_hts_meas_t * p_hts_meas,
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uint8_t * p_encoded_buffer)
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{
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uint8_t flags = 0;
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uint8_t len = 1;
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uint32_t encoded_temp;
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// Flags field
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if (p_hts_meas->temp_in_fahr_units)
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{
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flags |= HTS_MEAS_FLAG_TEMP_UNITS_BIT;
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}
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if (p_hts_meas->time_stamp_present)
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{
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flags |= HTS_MEAS_FLAG_TIME_STAMP_BIT;
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}
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// Temperature Measurement Value field
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if (p_hts_meas->temp_in_fahr_units)
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{
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flags |= HTS_MEAS_FLAG_TEMP_UNITS_BIT;
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encoded_temp = ((p_hts_meas->temp_in_fahr.exponent << 24) & 0xFF000000) |
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((p_hts_meas->temp_in_fahr.mantissa << 0) & 0x00FFFFFF);
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}
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else
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{
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encoded_temp = ((p_hts_meas->temp_in_celcius.exponent << 24) & 0xFF000000) |
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((p_hts_meas->temp_in_celcius.mantissa << 0) & 0x00FFFFFF);
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}
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len += uint32_encode(encoded_temp, &p_encoded_buffer[len]);
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// Time Stamp field
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if (p_hts_meas->time_stamp_present)
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{
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flags |= HTS_MEAS_FLAG_TIME_STAMP_BIT;
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len += ble_date_time_encode(&p_hts_meas->time_stamp, &p_encoded_buffer[len]);
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}
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// Temperature Type field
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if (p_hts_meas->temp_type_present)
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{
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flags |= HTS_MEAS_FLAG_TEMP_TYPE_BIT;
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p_encoded_buffer[len++] = p_hts_meas->temp_type;
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}
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// Flags field
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p_encoded_buffer[0] = flags;
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return len;
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}
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uint32_t ble_hts_init(ble_hts_t * p_hts, ble_hts_init_t const * p_hts_init)
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{
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VERIFY_PARAM_NOT_NULL(p_hts);
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VERIFY_PARAM_NOT_NULL(p_hts_init);
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VERIFY_PARAM_NOT_NULL(p_hts_init->p_gatt_queue);
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uint32_t err_code;
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uint8_t init_value[MAX_HTM_LEN];
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ble_hts_meas_t initial_htm;
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ble_uuid_t ble_uuid;
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ble_add_char_params_t add_char_params;
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// Initialize service structure
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p_hts->evt_handler = p_hts_init->evt_handler;
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p_hts->p_gatt_queue = p_hts_init->p_gatt_queue;
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p_hts->error_handler = p_hts_init->error_handler;
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p_hts->conn_handle = BLE_CONN_HANDLE_INVALID;
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p_hts->temp_type = p_hts_init->temp_type;
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// Add service
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BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_HEALTH_THERMOMETER_SERVICE);
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err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &ble_uuid, &p_hts->service_handle);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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// Add measurement characteristic
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memset(&add_char_params, 0, sizeof(add_char_params));
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memset(&initial_htm, 0, sizeof(initial_htm));
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add_char_params.uuid = BLE_UUID_TEMPERATURE_MEASUREMENT_CHAR;
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add_char_params.init_len = hts_measurement_encode(p_hts, &initial_htm, init_value);
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add_char_params.max_len = MAX_HTM_LEN;
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add_char_params.p_init_value = init_value;
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add_char_params.is_var_len = true;
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add_char_params.char_props.indicate = 1;
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add_char_params.cccd_write_access = p_hts_init->ht_meas_cccd_wr_sec;
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err_code = characteristic_add(p_hts->service_handle, &add_char_params, &p_hts->meas_handles);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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// Add temperature type characteristic
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if (p_hts_init->temp_type_as_characteristic)
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{
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memset(&add_char_params, 0, sizeof(add_char_params));
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add_char_params.uuid = BLE_UUID_TEMPERATURE_TYPE_CHAR;
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add_char_params.max_len = sizeof(uint8_t);
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add_char_params.char_props.read = 1;
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add_char_params.read_access = p_hts_init->ht_type_rd_sec;
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add_char_params.init_len = sizeof(uint8_t);
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add_char_params.p_init_value = (uint8_t *) &(p_hts_init->temp_type);
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err_code = characteristic_add(p_hts->service_handle,
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&add_char_params,
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&p_hts->temp_type_handles);
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if (err_code != NRF_SUCCESS)
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{
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return err_code;
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}
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}
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return NRF_SUCCESS;
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}
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uint32_t ble_hts_measurement_send(ble_hts_t * p_hts, ble_hts_meas_t * p_hts_meas)
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{
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uint32_t err_code;
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// Send value if connected
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if (p_hts->conn_handle != BLE_CONN_HANDLE_INVALID)
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{
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uint8_t encoded_hts_meas[MAX_HTM_LEN];
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uint16_t len;
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nrf_ble_gq_req_t hts_req;
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len = hts_measurement_encode(p_hts, p_hts_meas, encoded_hts_meas);
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memset(&hts_req, 0, sizeof(nrf_ble_gq_req_t));
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hts_req.type = NRF_BLE_GQ_REQ_GATTS_HVX;
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hts_req.error_handler.cb = gatt_error_handler;
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hts_req.error_handler.p_ctx = p_hts;
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hts_req.params.gatts_hvx.handle = p_hts->meas_handles.value_handle;
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hts_req.params.gatts_hvx.offset = 0;
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hts_req.params.gatts_hvx.p_data = encoded_hts_meas;
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hts_req.params.gatts_hvx.p_len = &len;
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hts_req.params.gatts_hvx.type = BLE_GATT_HVX_INDICATION;
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err_code = nrf_ble_gq_item_add(p_hts->p_gatt_queue, &hts_req, p_hts->conn_handle);
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}
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else
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{
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err_code = NRF_ERROR_INVALID_STATE;
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}
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return err_code;
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}
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uint32_t ble_hts_is_indication_enabled(ble_hts_t * p_hts, bool * p_indication_enabled)
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{
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uint32_t err_code;
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uint8_t cccd_value_buf[BLE_CCCD_VALUE_LEN];
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ble_gatts_value_t gatts_value;
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// Initialize value struct.
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memset(&gatts_value, 0, sizeof(gatts_value));
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gatts_value.len = BLE_CCCD_VALUE_LEN;
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gatts_value.offset = 0;
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gatts_value.p_value = cccd_value_buf;
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err_code = sd_ble_gatts_value_get(p_hts->conn_handle,
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p_hts->meas_handles.cccd_handle,
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&gatts_value);
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if (err_code == NRF_SUCCESS)
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{
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*p_indication_enabled = ble_srv_is_indication_enabled(cccd_value_buf);
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}
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if (err_code == BLE_ERROR_GATTS_SYS_ATTR_MISSING)
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{
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*p_indication_enabled = false;
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return NRF_SUCCESS;
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}
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return err_code;
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}
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#endif // NRF_MODULE_ENABLED(BLE_HTS)
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