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- /**
- * Copyright (c) 2016 - 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.
- *
- */
- #include <stdint.h>
- #include <string.h>
- #include "ble.h"
- #include "sdk_macros.h"
- #include "ble_srv_common.h"
- #include "nrf_ble_cgms.h"
- #include "cgms_meas.h"
- #include "cgms_db.h"
- /**@brief Function for encoding a Glucose measurement.
- *
- * @param[in] p_meas Measurement to be encoded.
- * @param[out] p_encoded_buffer Pointer to buffer where the encoded measurement is to be stored.
- *
- * @return Size of encoded measurement.
- */
- static uint8_t cgms_meas_encode(nrf_ble_cgms_t * p_cgms,
- const nrf_ble_cgms_meas_t * p_meas,
- uint8_t * p_encoded_buffer)
- {
- uint8_t len = 2;
- uint8_t flags = p_meas->flags;
- len += uint16_encode(p_meas->glucose_concentration,
- &p_encoded_buffer[len]);
- len += uint16_encode(p_meas->time_offset,
- &p_encoded_buffer[len]);
- if (p_meas->sensor_status_annunciation.warning != 0)
- {
- p_encoded_buffer[len++] = p_meas->sensor_status_annunciation.warning;
- flags |= NRF_BLE_CGMS_STATUS_FLAGS_WARNING_OCT_PRESENT;
- }
- if (p_meas->sensor_status_annunciation.calib_temp != 0)
- {
- p_encoded_buffer[len++] = p_meas->sensor_status_annunciation.calib_temp;
- flags |= NRF_BLE_CGMS_STATUS_FLAGS_CALTEMP_OCT_PRESENT;
- }
- if (p_meas->sensor_status_annunciation.status != 0)
- {
- p_encoded_buffer[len++] = p_meas->sensor_status_annunciation.status;
- flags |= NRF_BLE_CGMS_STATUS_FLAGS_STATUS_OCT_PRESENT;
- }
- // Trend field
- if (p_cgms->feature.feature & NRF_BLE_CGMS_FEAT_CGM_TREND_INFORMATION_SUPPORTED)
- {
- if (flags & NRF_BLE_CGMS_FLAG_TREND_INFO_PRESENT)
- {
- len += uint16_encode(p_meas->trend, &p_encoded_buffer[len]);
- }
- }
- // Quality field
- if (p_cgms->feature.feature & NRF_BLE_CGMS_FEAT_CGM_QUALITY_SUPPORTED)
- {
- if (flags & NRF_BLE_CGMS_FLAGS_QUALITY_PRESENT)
- {
- len += uint16_encode(p_meas->quality, &p_encoded_buffer[len]);
- }
- }
- p_encoded_buffer[1] = flags;
- p_encoded_buffer[0] = len;
- return len;
- }
- /**@brief Function for adding a characteristic for the Continuous Glucose Meter Measurement.
- *
- * @param[in] p_cgms Service instance.
- *
- * @return NRF_SUCCESS if characteristic was successfully added, otherwise an error code.
- */
- ret_code_t cgms_meas_char_add(nrf_ble_cgms_t * p_cgms)
- {
- uint8_t num_recs;
- uint8_t encoded_cgms_meas[NRF_BLE_CGMS_MEAS_LEN_MAX];
- ble_add_char_params_t add_char_params;
- ble_cgms_rec_t initial_cgms_rec_value;
- memset(&add_char_params, 0, sizeof(add_char_params));
- memset(&initial_cgms_rec_value, 0, sizeof(ble_cgms_rec_t));
- num_recs = cgms_db_num_records_get();
- if (num_recs > 0)
- {
- uint32_t err_code = cgms_db_record_get(num_recs - 1, &initial_cgms_rec_value);
- if (err_code != NRF_SUCCESS)
- {
- return err_code;
- }
- }
- add_char_params.uuid = BLE_UUID_CGM_MEASUREMENT;
- add_char_params.max_len = NRF_BLE_CGMS_MEAS_LEN_MAX;
- add_char_params.init_len = cgms_meas_encode(p_cgms,
- &initial_cgms_rec_value.meas,
- encoded_cgms_meas);
- add_char_params.p_init_value = encoded_cgms_meas;
- add_char_params.is_var_len = true;
- add_char_params.char_props.notify = true;
- add_char_params.cccd_write_access = SEC_JUST_WORKS;
- return characteristic_add(p_cgms->service_handle,
- &add_char_params,
- &p_cgms->char_handles.measurment);
- }
- ret_code_t cgms_meas_send(nrf_ble_cgms_t * p_cgms, ble_cgms_rec_t * p_rec, uint8_t * p_count)
- {
- uint32_t err_code;
- uint8_t encoded_meas[NRF_BLE_CGMS_MEAS_LEN_MAX + NRF_BLE_CGMS_MEAS_REC_LEN_MAX];
- uint16_t len = 0;
- uint16_t hvx_len = NRF_BLE_CGMS_MEAS_LEN_MAX;
- int i;
- ble_gatts_hvx_params_t hvx_params;
- for (i = 0; i < *p_count; i++)
- {
- uint8_t meas_len = cgms_meas_encode(p_cgms, &(p_rec[i].meas), (encoded_meas + len));
- if (len + meas_len >= NRF_BLE_CGMS_MEAS_LEN_MAX)
- {
- break;
- }
- len += meas_len;
- }
- *p_count = i;
- hvx_len = len;
- memset(&hvx_params, 0, sizeof(hvx_params));
- hvx_params.handle = p_cgms->char_handles.measurment.value_handle;
- hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
- hvx_params.offset = 0;
- hvx_params.p_len = &hvx_len;
- hvx_params.p_data = encoded_meas;
- err_code = sd_ble_gatts_hvx(p_cgms->conn_handle, &hvx_params);
- if (err_code == NRF_SUCCESS)
- {
- if (hvx_len != len)
- {
- err_code = NRF_ERROR_DATA_SIZE;
- }
- else
- {
- // Measurement successfully sent
- p_cgms->racp_data.racp_proc_records_reported += *p_count;
- }
- }
- return err_code;
- }
- /**@brief Function for handling the Glucose measurement CCCD write event.
- *
- * @param[in] p_cgms Service instance.
- * @param[in] p_evt_write WRITE event to be handled.
- */
- static void on_meas_cccd_write(nrf_ble_cgms_t * p_cgms, ble_gatts_evt_write_t const * p_evt_write)
- {
- if (p_evt_write->len == 2)
- {
- // CCCD written, update notification state
- if (p_cgms->evt_handler != NULL)
- {
- nrf_ble_cgms_evt_t evt;
- if (ble_srv_is_notification_enabled(p_evt_write->data))
- {
- evt.evt_type = NRF_BLE_CGMS_EVT_NOTIFICATION_ENABLED;
- }
- else
- {
- evt.evt_type = NRF_BLE_CGMS_EVT_NOTIFICATION_DISABLED;
- }
- p_cgms->evt_handler(p_cgms, &evt);
- }
- }
- }
- /**@brief Function for handling the WRITE event.
- *
- * @details Handles WRITE events from the BLE stack.
- *
- * @param[in] p_cgms Glucose Service structure.
- * @param[in] p_ble_evt Event received from the BLE stack.
- */
- void cgms_meas_on_write(nrf_ble_cgms_t * p_cgms, ble_gatts_evt_write_t const * p_evt_write)
- {
- if (p_evt_write->handle == p_cgms->char_handles.measurment.cccd_handle)
- {
- on_meas_cccd_write(p_cgms, p_evt_write);
- }
- }
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