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- /**
- * 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_HRS)
- #include "ble_hrs.h"
- #include <string.h>
- #include "ble_srv_common.h"
- #define OPCODE_LENGTH 1 /**< Length of opcode inside Heart Rate Measurement packet. */
- #define HANDLE_LENGTH 2 /**< Length of handle inside Heart Rate Measurement packet. */
- #define MAX_HRM_LEN (NRF_SDH_BLE_GATT_MAX_MTU_SIZE - OPCODE_LENGTH - HANDLE_LENGTH) /**< Maximum size of a transmitted Heart Rate Measurement. */
- #define INITIAL_VALUE_HRM 0 /**< Initial Heart Rate Measurement value. */
- // Heart Rate Measurement flag bits
- #define HRM_FLAG_MASK_HR_VALUE_16BIT (0x01 << 0) /**< Heart Rate Value Format bit. */
- #define HRM_FLAG_MASK_SENSOR_CONTACT_DETECTED (0x01 << 1) /**< Sensor Contact Detected bit. */
- #define HRM_FLAG_MASK_SENSOR_CONTACT_SUPPORTED (0x01 << 2) /**< Sensor Contact Supported bit. */
- #define HRM_FLAG_MASK_EXPENDED_ENERGY_INCLUDED (0x01 << 3) /**< Energy Expended Status bit. Feature Not Supported */
- #define HRM_FLAG_MASK_RR_INTERVAL_INCLUDED (0x01 << 4) /**< RR-Interval bit. */
- /**@brief Function for handling the Connect event.
- *
- * @param[in] p_hrs Heart Rate Service structure.
- * @param[in] p_ble_evt Event received from the BLE stack.
- */
- static void on_connect(ble_hrs_t * p_hrs, ble_evt_t const * p_ble_evt)
- {
- p_hrs->conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
- }
- /**@brief Function for handling the Disconnect event.
- *
- * @param[in] p_hrs Heart Rate Service structure.
- * @param[in] p_ble_evt Event received from the BLE stack.
- */
- static void on_disconnect(ble_hrs_t * p_hrs, ble_evt_t const * p_ble_evt)
- {
- UNUSED_PARAMETER(p_ble_evt);
- p_hrs->conn_handle = BLE_CONN_HANDLE_INVALID;
- }
- /**@brief Function for handling write events to the Heart Rate Measurement characteristic.
- *
- * @param[in] p_hrs Heart Rate Service structure.
- * @param[in] p_evt_write Write event received from the BLE stack.
- */
- static void on_hrm_cccd_write(ble_hrs_t * p_hrs, ble_gatts_evt_write_t const * p_evt_write)
- {
- if (p_evt_write->len == 2)
- {
- // CCCD written, update notification state
- if (p_hrs->evt_handler != NULL)
- {
- ble_hrs_evt_t evt;
- if (ble_srv_is_notification_enabled(p_evt_write->data))
- {
- evt.evt_type = BLE_HRS_EVT_NOTIFICATION_ENABLED;
- }
- else
- {
- evt.evt_type = BLE_HRS_EVT_NOTIFICATION_DISABLED;
- }
- p_hrs->evt_handler(p_hrs, &evt);
- }
- }
- }
- /**@brief Function for handling the Write event.
- *
- * @param[in] p_hrs Heart Rate Service structure.
- * @param[in] p_ble_evt Event received from the BLE stack.
- */
- static void on_write(ble_hrs_t * p_hrs, 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_hrs->hrm_handles.cccd_handle)
- {
- on_hrm_cccd_write(p_hrs, p_evt_write);
- }
- }
- void ble_hrs_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
- {
- ble_hrs_t * p_hrs = (ble_hrs_t *) p_context;
- switch (p_ble_evt->header.evt_id)
- {
- case BLE_GAP_EVT_CONNECTED:
- on_connect(p_hrs, p_ble_evt);
- break;
- case BLE_GAP_EVT_DISCONNECTED:
- on_disconnect(p_hrs, p_ble_evt);
- break;
- case BLE_GATTS_EVT_WRITE:
- on_write(p_hrs, p_ble_evt);
- break;
- default:
- // No implementation needed.
- break;
- }
- }
- /**@brief Function for encoding a Heart Rate Measurement.
- *
- * @param[in] p_hrs Heart Rate Service structure.
- * @param[in] heart_rate 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 hrm_encode(ble_hrs_t * p_hrs, uint16_t heart_rate, uint8_t * p_encoded_buffer)
- {
- uint8_t flags = 0;
- uint8_t len = 1;
- int i;
- // Set sensor contact related flags
- if (p_hrs->is_sensor_contact_supported)
- {
- flags |= HRM_FLAG_MASK_SENSOR_CONTACT_SUPPORTED;
- }
- if (p_hrs->is_sensor_contact_detected)
- {
- flags |= HRM_FLAG_MASK_SENSOR_CONTACT_DETECTED;
- }
- // Encode heart rate measurement
- if (heart_rate > 0xff)
- {
- flags |= HRM_FLAG_MASK_HR_VALUE_16BIT;
- len += uint16_encode(heart_rate, &p_encoded_buffer[len]);
- }
- else
- {
- p_encoded_buffer[len++] = (uint8_t)heart_rate;
- }
- // Encode rr_interval values
- if (p_hrs->rr_interval_count > 0)
- {
- flags |= HRM_FLAG_MASK_RR_INTERVAL_INCLUDED;
- }
- for (i = 0; i < p_hrs->rr_interval_count; i++)
- {
- if (len + sizeof(uint16_t) > p_hrs->max_hrm_len)
- {
- // Not all stored rr_interval values can fit into the encoded hrm,
- // move the remaining values to the start of the buffer.
- memmove(&p_hrs->rr_interval[0],
- &p_hrs->rr_interval[i],
- (p_hrs->rr_interval_count - i) * sizeof(uint16_t));
- break;
- }
- len += uint16_encode(p_hrs->rr_interval[i], &p_encoded_buffer[len]);
- }
- p_hrs->rr_interval_count -= i;
- // Add flags
- p_encoded_buffer[0] = flags;
- return len;
- }
- uint32_t ble_hrs_init(ble_hrs_t * p_hrs, const ble_hrs_init_t * p_hrs_init)
- {
- uint32_t err_code;
- ble_uuid_t ble_uuid;
- ble_add_char_params_t add_char_params;
- uint8_t encoded_initial_hrm[MAX_HRM_LEN];
- // Initialize service structure
- p_hrs->evt_handler = p_hrs_init->evt_handler;
- p_hrs->is_sensor_contact_supported = p_hrs_init->is_sensor_contact_supported;
- p_hrs->conn_handle = BLE_CONN_HANDLE_INVALID;
- p_hrs->is_sensor_contact_detected = false;
- p_hrs->rr_interval_count = 0;
- p_hrs->max_hrm_len = MAX_HRM_LEN;
- // Add service
- BLE_UUID_BLE_ASSIGN(ble_uuid, BLE_UUID_HEART_RATE_SERVICE);
- err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
- &ble_uuid,
- &p_hrs->service_handle);
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
- // Add heart rate measurement characteristic
- memset(&add_char_params, 0, sizeof(add_char_params));
- add_char_params.uuid = BLE_UUID_HEART_RATE_MEASUREMENT_CHAR;
- add_char_params.max_len = MAX_HRM_LEN;
- add_char_params.init_len = hrm_encode(p_hrs, INITIAL_VALUE_HRM, encoded_initial_hrm);
- add_char_params.p_init_value = encoded_initial_hrm;
- add_char_params.is_var_len = true;
- add_char_params.char_props.notify = 1;
- add_char_params.cccd_write_access = p_hrs_init->hrm_cccd_wr_sec;
- err_code = characteristic_add(p_hrs->service_handle, &add_char_params, &(p_hrs->hrm_handles));
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
- if (p_hrs_init->p_body_sensor_location != NULL)
- {
- // Add body sensor location characteristic
- memset(&add_char_params, 0, sizeof(add_char_params));
- add_char_params.uuid = BLE_UUID_BODY_SENSOR_LOCATION_CHAR;
- add_char_params.max_len = sizeof(uint8_t);
- add_char_params.init_len = sizeof(uint8_t);
- add_char_params.p_init_value = p_hrs_init->p_body_sensor_location;
- add_char_params.char_props.read = 1;
- add_char_params.read_access = p_hrs_init->bsl_rd_sec;
- err_code = characteristic_add(p_hrs->service_handle, &add_char_params, &(p_hrs->bsl_handles));
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
- }
- return NRF_SUCCESS;
- }
- uint32_t ble_hrs_heart_rate_measurement_send(ble_hrs_t * p_hrs, uint16_t heart_rate)
- {
- uint32_t err_code;
- // Send value if connected and notifying
- if (p_hrs->conn_handle != BLE_CONN_HANDLE_INVALID)
- {
- uint8_t encoded_hrm[MAX_HRM_LEN];
- uint16_t len;
- uint16_t hvx_len;
- ble_gatts_hvx_params_t hvx_params;
- len = hrm_encode(p_hrs, heart_rate, encoded_hrm);
- hvx_len = len;
- memset(&hvx_params, 0, sizeof(hvx_params));
- hvx_params.handle = p_hrs->hrm_handles.value_handle;
- hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
- hvx_params.offset = 0;
- hvx_params.p_len = &hvx_len;
- hvx_params.p_data = encoded_hrm;
- err_code = sd_ble_gatts_hvx(p_hrs->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;
- }
- void ble_hrs_rr_interval_add(ble_hrs_t * p_hrs, uint16_t rr_interval)
- {
- if (p_hrs->rr_interval_count == BLE_HRS_MAX_BUFFERED_RR_INTERVALS)
- {
- // The rr_interval buffer is full, delete the oldest value
- memmove(&p_hrs->rr_interval[0],
- &p_hrs->rr_interval[1],
- (BLE_HRS_MAX_BUFFERED_RR_INTERVALS - 1) * sizeof(uint16_t));
- p_hrs->rr_interval_count--;
- }
- // Add new value
- p_hrs->rr_interval[p_hrs->rr_interval_count++] = rr_interval;
- }
- bool ble_hrs_rr_interval_buffer_is_full(ble_hrs_t * p_hrs)
- {
- return (p_hrs->rr_interval_count == BLE_HRS_MAX_BUFFERED_RR_INTERVALS);
- }
- uint32_t ble_hrs_sensor_contact_supported_set(ble_hrs_t * p_hrs, bool is_sensor_contact_supported)
- {
- // Check if we are connected to peer
- if (p_hrs->conn_handle == BLE_CONN_HANDLE_INVALID)
- {
- p_hrs->is_sensor_contact_supported = is_sensor_contact_supported;
- return NRF_SUCCESS;
- }
- else
- {
- return NRF_ERROR_INVALID_STATE;
- }
- }
- void ble_hrs_sensor_contact_detected_update(ble_hrs_t * p_hrs, bool is_sensor_contact_detected)
- {
- p_hrs->is_sensor_contact_detected = is_sensor_contact_detected;
- }
- uint32_t ble_hrs_body_sensor_location_set(ble_hrs_t * p_hrs, uint8_t body_sensor_location)
- {
- ble_gatts_value_t gatts_value;
- // Initialize value struct.
- memset(&gatts_value, 0, sizeof(gatts_value));
- gatts_value.len = sizeof(uint8_t);
- gatts_value.offset = 0;
- gatts_value.p_value = &body_sensor_location;
- return sd_ble_gatts_value_set(p_hrs->conn_handle, p_hrs->bsl_handles.value_handle, &gatts_value);
- }
- void ble_hrs_on_gatt_evt(ble_hrs_t * p_hrs, nrf_ble_gatt_evt_t const * p_gatt_evt)
- {
- if ( (p_hrs->conn_handle == p_gatt_evt->conn_handle)
- && (p_gatt_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED))
- {
- p_hrs->max_hrm_len = p_gatt_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH;
- }
- }
- #endif // NRF_MODULE_ENABLED(BLE_HRS)
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