
hr with 30102
Dependencies: BLE_API mbed X_NUCLEO_IDB0XA1
Fork of BLE_HeartRate by
Diff: HeartRateService.h
- Revision:
- 39:6390604f904c
- Child:
- 41:9cef0129da5f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HeartRateService.h Fri Aug 22 14:55:52 2014 +0000 @@ -0,0 +1,97 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef __BLE_HEART_RATE_SERVICE_H__ +#define __BLE_HEART_RATE_SERVICE_H__ + +#include "BLEDevice.h" + +/* Heart Rate Service */ +/* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */ +/* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */ +/* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */ +class HeartRateService { +public: + static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_OTHER = 0; + static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_CHEST = 1; + static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_WRIST = 2; + static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_FINGER = 3; + static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_HAND = 4; + static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_EAR_LOBE = 5; + static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_FOOT = 6; + +public: + HeartRateService(BLEDevice &_ble, uint8_t _hrmCounter, uint8_t _location) : + ble(_ble), + bpm(_hrmCounter), + hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, bpm.getPointer(), HeartRateValueBytes::SIZEOF_ARRAY, HeartRateValueBytes::SIZEOF_ARRAY, + GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY), + hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, (uint8_t *)&_location, sizeof(_location), sizeof(_location), + GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ) { + + static bool serviceAdded = false; /* We should only ever need to add the heart rate service once. */ + if (serviceAdded) { + return; + } + + GattCharacteristic *hrmChars[] = {&hrmRate, &hrmLocation, }; + GattService hrmService(GattService::UUID_HEART_RATE_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *)); + + ble.addService(hrmService); + serviceAdded = true; + } + + void updateHeartRate(uint8_t hrmCounter) { + if (ble.getGapState().connected) { + bpm.updateHeartRate(hrmCounter); + ble.updateCharacteristicValue(hrmRate.getHandle(), bpm.getPointer(), HeartRateValueBytes::SIZEOF_ARRAY); + } + } + +private: + /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */ + struct HeartRateValueBytes { + static const unsigned SIZEOF_ARRAY = 2; + + HeartRateValueBytes(uint8_t hrmCounter) : beatsPerMinute() { + updateHeartRate(hrmCounter); + } + + void updateHeartRate(uint8_t hrmCounter) { + beatsPerMinute[1] = hrmCounter; + } + + uint8_t *getPointer(void) { + return beatsPerMinute; + } + + const uint8_t *getPointer(void) const { + return beatsPerMinute; + } + + /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */ + /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */ + uint8_t beatsPerMinute[SIZEOF_ARRAY]; + }; + +private: + BLEDevice &ble; + HeartRateValueBytes bpm; + GattCharacteristic hrmRate; + GattCharacteristic hrmLocation; +}; + +#endif /* #ifndef __BLE_HEART_RATE_SERVICE_H__*/