392 lines
13 KiB
C
392 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_HRS)
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#include "ble_hrs.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 Heart Rate Measurement packet. */
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#define HANDLE_LENGTH 2 /**< Length of handle inside Heart Rate Measurement packet. */
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#define MAX_HRM_LEN (NRF_SDH_BLE_GATT_MAX_MTU_SIZE - OPCODE_LENGTH - HANDLE_LENGTH) /**< Maximum size of a transmitted Heart Rate Measurement. */
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#define INITIAL_VALUE_HRM 0 /**< Initial Heart Rate Measurement value. */
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// Heart Rate Measurement flag bits
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#define HRM_FLAG_MASK_HR_VALUE_16BIT (0x01 << 0) /**< Heart Rate Value Format bit. */
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#define HRM_FLAG_MASK_SENSOR_CONTACT_DETECTED (0x01 << 1) /**< Sensor Contact Detected bit. */
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#define HRM_FLAG_MASK_SENSOR_CONTACT_SUPPORTED (0x01 << 2) /**< Sensor Contact Supported bit. */
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#define HRM_FLAG_MASK_EXPENDED_ENERGY_INCLUDED (0x01 << 3) /**< Energy Expended Status bit. Feature Not Supported */
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#define HRM_FLAG_MASK_RR_INTERVAL_INCLUDED (0x01 << 4) /**< RR-Interval bit. */
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/**@brief Function for handling the Connect event.
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*
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* @param[in] p_hrs Heart Rate 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_hrs_t * p_hrs, ble_evt_t const * p_ble_evt)
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{
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p_hrs->conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
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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_hrs Heart Rate 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_hrs_t * p_hrs, 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_hrs->conn_handle = BLE_CONN_HANDLE_INVALID;
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}
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/**@brief Function for handling write events to the Heart Rate Measurement characteristic.
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*
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* @param[in] p_hrs Heart Rate 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_hrm_cccd_write(ble_hrs_t * p_hrs, 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 notification state
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if (p_hrs->evt_handler != NULL)
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{
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ble_hrs_evt_t evt;
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if (ble_srv_is_notification_enabled(p_evt_write->data))
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{
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evt.evt_type = BLE_HRS_EVT_NOTIFICATION_ENABLED;
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}
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else
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{
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evt.evt_type = BLE_HRS_EVT_NOTIFICATION_DISABLED;
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}
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p_hrs->evt_handler(p_hrs, &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_hrs Heart Rate 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_hrs_t * p_hrs, 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_hrs->hrm_handles.cccd_handle)
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{
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on_hrm_cccd_write(p_hrs, p_evt_write);
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}
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}
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void ble_hrs_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
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{
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ble_hrs_t * p_hrs = (ble_hrs_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_hrs, p_ble_evt);
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break;
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case BLE_GAP_EVT_DISCONNECTED:
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on_disconnect(p_hrs, p_ble_evt);
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break;
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case BLE_GATTS_EVT_WRITE:
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on_write(p_hrs, 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 Heart Rate Measurement.
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*
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* @param[in] p_hrs Heart Rate Service structure.
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* @param[in] heart_rate 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 hrm_encode(ble_hrs_t * p_hrs, uint16_t heart_rate, 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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int i;
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// Set sensor contact related flags
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if (p_hrs->is_sensor_contact_supported)
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{
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flags |= HRM_FLAG_MASK_SENSOR_CONTACT_SUPPORTED;
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}
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if (p_hrs->is_sensor_contact_detected)
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{
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flags |= HRM_FLAG_MASK_SENSOR_CONTACT_DETECTED;
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}
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// Encode heart rate measurement
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if (heart_rate > 0xff)
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{
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flags |= HRM_FLAG_MASK_HR_VALUE_16BIT;
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len += uint16_encode(heart_rate, &p_encoded_buffer[len]);
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}
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else
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{
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p_encoded_buffer[len++] = (uint8_t)heart_rate;
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}
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// Encode rr_interval values
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if (p_hrs->rr_interval_count > 0)
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{
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flags |= HRM_FLAG_MASK_RR_INTERVAL_INCLUDED;
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}
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for (i = 0; i < p_hrs->rr_interval_count; i++)
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{
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if (len + sizeof(uint16_t) > p_hrs->max_hrm_len)
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{
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// Not all stored rr_interval values can fit into the encoded hrm,
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// move the remaining values to the start of the buffer.
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memmove(&p_hrs->rr_interval[0],
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&p_hrs->rr_interval[i],
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(p_hrs->rr_interval_count - i) * sizeof(uint16_t));
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break;
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}
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len += uint16_encode(p_hrs->rr_interval[i], &p_encoded_buffer[len]);
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}
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p_hrs->rr_interval_count -= i;
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// Add flags
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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_hrs_init(ble_hrs_t * p_hrs, const ble_hrs_init_t * p_hrs_init)
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{
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uint32_t err_code;
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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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uint8_t encoded_initial_hrm[MAX_HRM_LEN];
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// Initialize service structure
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p_hrs->evt_handler = p_hrs_init->evt_handler;
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p_hrs->is_sensor_contact_supported = p_hrs_init->is_sensor_contact_supported;
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p_hrs->conn_handle = BLE_CONN_HANDLE_INVALID;
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p_hrs->is_sensor_contact_detected = false;
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p_hrs->rr_interval_count = 0;
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p_hrs->max_hrm_len = MAX_HRM_LEN;
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// Add service
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BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_HEART_RATE_SERVICE);
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err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
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&ble_uuid,
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&p_hrs->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 heart rate measurement characteristic
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memset(&add_char_params, 0, sizeof(add_char_params));
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add_char_params.uuid = BLE_UUID_HEART_RATE_MEASUREMENT_CHAR;
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add_char_params.max_len = MAX_HRM_LEN;
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add_char_params.init_len = hrm_encode(p_hrs, INITIAL_VALUE_HRM, encoded_initial_hrm);
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add_char_params.p_init_value = encoded_initial_hrm;
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add_char_params.is_var_len = true;
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add_char_params.char_props.notify = 1;
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add_char_params.cccd_write_access = p_hrs_init->hrm_cccd_wr_sec;
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err_code = characteristic_add(p_hrs->service_handle, &add_char_params, &(p_hrs->hrm_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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if (p_hrs_init->p_body_sensor_location != NULL)
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{
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// Add body sensor location characteristic
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memset(&add_char_params, 0, sizeof(add_char_params));
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add_char_params.uuid = BLE_UUID_BODY_SENSOR_LOCATION_CHAR;
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add_char_params.max_len = sizeof(uint8_t);
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add_char_params.init_len = sizeof(uint8_t);
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add_char_params.p_init_value = p_hrs_init->p_body_sensor_location;
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add_char_params.char_props.read = 1;
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add_char_params.read_access = p_hrs_init->bsl_rd_sec;
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err_code = characteristic_add(p_hrs->service_handle, &add_char_params, &(p_hrs->bsl_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_hrs_heart_rate_measurement_send(ble_hrs_t * p_hrs, uint16_t heart_rate)
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{
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uint32_t err_code;
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// Send value if connected and notifying
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if (p_hrs->conn_handle != BLE_CONN_HANDLE_INVALID)
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{
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uint8_t encoded_hrm[MAX_HRM_LEN];
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uint16_t len;
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uint16_t hvx_len;
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ble_gatts_hvx_params_t hvx_params;
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len = hrm_encode(p_hrs, heart_rate, encoded_hrm);
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hvx_len = len;
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memset(&hvx_params, 0, sizeof(hvx_params));
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hvx_params.handle = p_hrs->hrm_handles.value_handle;
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hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
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hvx_params.offset = 0;
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hvx_params.p_len = &hvx_len;
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hvx_params.p_data = encoded_hrm;
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err_code = sd_ble_gatts_hvx(p_hrs->conn_handle, &hvx_params);
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if ((err_code == NRF_SUCCESS) && (hvx_len != len))
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{
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err_code = NRF_ERROR_DATA_SIZE;
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}
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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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void ble_hrs_rr_interval_add(ble_hrs_t * p_hrs, uint16_t rr_interval)
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{
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if (p_hrs->rr_interval_count == BLE_HRS_MAX_BUFFERED_RR_INTERVALS)
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{
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// The rr_interval buffer is full, delete the oldest value
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memmove(&p_hrs->rr_interval[0],
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&p_hrs->rr_interval[1],
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(BLE_HRS_MAX_BUFFERED_RR_INTERVALS - 1) * sizeof(uint16_t));
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p_hrs->rr_interval_count--;
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}
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// Add new value
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p_hrs->rr_interval[p_hrs->rr_interval_count++] = rr_interval;
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}
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bool ble_hrs_rr_interval_buffer_is_full(ble_hrs_t * p_hrs)
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{
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return (p_hrs->rr_interval_count == BLE_HRS_MAX_BUFFERED_RR_INTERVALS);
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}
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uint32_t ble_hrs_sensor_contact_supported_set(ble_hrs_t * p_hrs, bool is_sensor_contact_supported)
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{
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// Check if we are connected to peer
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if (p_hrs->conn_handle == BLE_CONN_HANDLE_INVALID)
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{
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p_hrs->is_sensor_contact_supported = is_sensor_contact_supported;
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return NRF_SUCCESS;
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}
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else
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{
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return NRF_ERROR_INVALID_STATE;
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}
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}
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void ble_hrs_sensor_contact_detected_update(ble_hrs_t * p_hrs, bool is_sensor_contact_detected)
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{
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p_hrs->is_sensor_contact_detected = is_sensor_contact_detected;
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}
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uint32_t ble_hrs_body_sensor_location_set(ble_hrs_t * p_hrs, uint8_t body_sensor_location)
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{
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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 = sizeof(uint8_t);
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gatts_value.offset = 0;
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gatts_value.p_value = &body_sensor_location;
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return sd_ble_gatts_value_set(p_hrs->conn_handle, p_hrs->bsl_handles.value_handle, &gatts_value);
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}
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void ble_hrs_on_gatt_evt(ble_hrs_t * p_hrs, nrf_ble_gatt_evt_t const * p_gatt_evt)
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{
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if ( (p_hrs->conn_handle == p_gatt_evt->conn_handle)
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&& (p_gatt_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED))
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{
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p_hrs->max_hrm_len = p_gatt_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH;
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}
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}
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#endif // NRF_MODULE_ENABLED(BLE_HRS)
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