BLE lib
Fork of Nucleo_BLE_API by
services/HealthThermometerService.h
- Committer:
- sjallouli
- Date:
- 2014-12-19
- Revision:
- 0:289fd2dae405
File content as of revision 0:289fd2dae405:
/* 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_HEALTH_THERMOMETER_SERVICE_H__ #define __BLE_HEALTH_THERMOMETER_SERVICE_H__ #include "BLEDevice.h" /* Health Thermometer Service */ /* Service: https://developer.bluetooth.org/gatt/profiles/Pages/ProfileViewer.aspx?u=org.bluetooth.profile.health_thermometer.xml */ /* Temperature Measurement: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */ /* Temperature Type: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_type.xml */ class HealthThermometerService { public: enum { LOCATION_ARMPIT = 1, LOCATION_BODY, LOCATION_EAR, LOCATION_FINGER, LOCATION_GI_TRACT, LOCATION_MOUTH, LOCATION_RECTUM, LOCATION_TOE, LOCATION_EAR_DRUM, }; public: /** * @param[in] _ble reference to the BLE device * @param[in] initialTemp initial value in celsius * @param[in] _location */ HealthThermometerService(BLEDevice &_ble, float initialTemp, uint8_t _location) : ble(_ble), valueBytes(initialTemp), tempMeasurement(GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, valueBytes.getPointer(), sizeof(TemperatureValueBytes), sizeof(TemperatureValueBytes), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY), tempLocation(GattCharacteristic::UUID_TEMPERATURE_TYPE_CHAR, (uint8_t *)&_location, sizeof(_location), sizeof(_location), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ) { GattCharacteristic *hrmChars[] = {&tempMeasurement, &tempLocation, }; GattService hrmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *)); ble.addService(hrmService); } void updateTemperature(float temperature) { if (ble.getGapState().connected) { valueBytes.updateTemperature(temperature); ble.updateCharacteristicValue(tempMeasurement.getValueAttribute().getHandle(), valueBytes.getPointer(), sizeof(TemperatureValueBytes)); } } private: /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */ struct TemperatureValueBytes { static const unsigned OFFSET_OF_FLAGS = 0; static const unsigned OFFSET_OF_VALUE = OFFSET_OF_FLAGS + sizeof(uint8_t); static const unsigned SIZEOF_VALUE_BYTES = sizeof(uint8_t) + sizeof(float); static const unsigned TEMPERATURE_UNITS_FLAG_POS = 0; static const unsigned TIMESTAMP_FLAG_POS = 1; static const unsigned TEMPERATURE_TYPE_FLAG_POS = 2; static const uint8_t TEMPERATURE_UNITS_CELSIUS = 0; static const uint8_t TEMPERATURE_UNITS_FAHRENHEIT = 1; TemperatureValueBytes(float initialTemperature) : bytes() { /* assumption: temperature values are expressed in Celsius */ bytes[OFFSET_OF_FLAGS] = (TEMPERATURE_UNITS_CELSIUS << TEMPERATURE_UNITS_FLAG_POS) | (false << TIMESTAMP_FLAG_POS) | (false << TEMPERATURE_TYPE_FLAG_POS); updateTemperature(initialTemperature); } void updateTemperature(float temp) { uint32_t temp_ieee11073 = quick_ieee11073_from_float(temp); memcpy(&bytes[OFFSET_OF_VALUE], &temp_ieee11073, sizeof(float)); } uint8_t *getPointer(void) { return bytes; } const uint8_t *getPointer(void) const { return bytes; } private: /** * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type. * @param temperature The temperature as a float. * @return The temperature in 11073-20601 FLOAT-Type format. */ uint32_t quick_ieee11073_from_float(float temperature) { uint8_t exponent = 0xFE; //exponent is -2 uint32_t mantissa = (uint32_t)(temperature * 100); return (((uint32_t)exponent) << 24) | mantissa; } private: /* First byte = 8-bit flags, Second field is a float holding the temperature value. */ /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */ uint8_t bytes[SIZEOF_VALUE_BYTES]; }; private: BLEDevice &ble; TemperatureValueBytes valueBytes; GattCharacteristic tempMeasurement; GattCharacteristic tempLocation; }; #endif /* #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__*/