wanjun chen / Nucleo_BLE_API_IOTIO

IOTIO

Fork of Nucleo_BLE_API by ST Americas mbed Team

services/HealthThermometerService.h@0:289fd2dae405, 2014-12-19 (annotated)

Committer:
sjallouli
Date:
Fri Dec 19 18:54:46 2014 +0000
Revision:
0:289fd2dae405
BLE_API for Nucleo Bluetoothe Low Energy Shield

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sjallouli 0:289fd2dae405 1 /* mbed Microcontroller Library
sjallouli 0:289fd2dae405 2 * Copyright (c) 2006-2013 ARM Limited
sjallouli 0:289fd2dae405 3 *
sjallouli 0:289fd2dae405 4 * Licensed under the Apache License, Version 2.0 (the "License");
sjallouli 0:289fd2dae405 5 * you may not use this file except in compliance with the License.
sjallouli 0:289fd2dae405 6 * You may obtain a copy of the License at
sjallouli 0:289fd2dae405 7 *
sjallouli 0:289fd2dae405 8 * http://www.apache.org/licenses/LICENSE-2.0
sjallouli 0:289fd2dae405 9 *
sjallouli 0:289fd2dae405 10 * Unless required by applicable law or agreed to in writing, software
sjallouli 0:289fd2dae405 11 * distributed under the License is distributed on an "AS IS" BASIS,
sjallouli 0:289fd2dae405 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
sjallouli 0:289fd2dae405 13 * See the License for the specific language governing permissions and
sjallouli 0:289fd2dae405 14 * limitations under the License.
sjallouli 0:289fd2dae405 15 */
sjallouli 0:289fd2dae405 16
sjallouli 0:289fd2dae405 17 #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__
sjallouli 0:289fd2dae405 18 #define __BLE_HEALTH_THERMOMETER_SERVICE_H__
sjallouli 0:289fd2dae405 19
sjallouli 0:289fd2dae405 20 #include "BLEDevice.h"
sjallouli 0:289fd2dae405 21
sjallouli 0:289fd2dae405 22 /* Health Thermometer Service */
sjallouli 0:289fd2dae405 23 /* Service: https://developer.bluetooth.org/gatt/profiles/Pages/ProfileViewer.aspx?u=org.bluetooth.profile.health_thermometer.xml */
sjallouli 0:289fd2dae405 24 /* Temperature Measurement: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
sjallouli 0:289fd2dae405 25 /* Temperature Type: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_type.xml */
sjallouli 0:289fd2dae405 26 class HealthThermometerService {
sjallouli 0:289fd2dae405 27 public:
sjallouli 0:289fd2dae405 28 enum {
sjallouli 0:289fd2dae405 29 LOCATION_ARMPIT = 1,
sjallouli 0:289fd2dae405 30 LOCATION_BODY,
sjallouli 0:289fd2dae405 31 LOCATION_EAR,
sjallouli 0:289fd2dae405 32 LOCATION_FINGER,
sjallouli 0:289fd2dae405 33 LOCATION_GI_TRACT,
sjallouli 0:289fd2dae405 34 LOCATION_MOUTH,
sjallouli 0:289fd2dae405 35 LOCATION_RECTUM,
sjallouli 0:289fd2dae405 36 LOCATION_TOE,
sjallouli 0:289fd2dae405 37 LOCATION_EAR_DRUM,
sjallouli 0:289fd2dae405 38 };
sjallouli 0:289fd2dae405 39
sjallouli 0:289fd2dae405 40 public:
sjallouli 0:289fd2dae405 41
sjallouli 0:289fd2dae405 42 /**
sjallouli 0:289fd2dae405 43 * @param[in] _ble reference to the BLE device
sjallouli 0:289fd2dae405 44 * @param[in] initialTemp initial value in celsius
sjallouli 0:289fd2dae405 45 * @param[in] _location
sjallouli 0:289fd2dae405 46 */
sjallouli 0:289fd2dae405 47 HealthThermometerService(BLEDevice &_ble, float initialTemp, uint8_t _location) :
sjallouli 0:289fd2dae405 48 ble(_ble),
sjallouli 0:289fd2dae405 49 valueBytes(initialTemp),
sjallouli 0:289fd2dae405 50 tempMeasurement(GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, valueBytes.getPointer(),
sjallouli 0:289fd2dae405 51 sizeof(TemperatureValueBytes), sizeof(TemperatureValueBytes),
sjallouli 0:289fd2dae405 52 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
sjallouli 0:289fd2dae405 53 tempLocation(GattCharacteristic::UUID_TEMPERATURE_TYPE_CHAR, (uint8_t *)&_location, sizeof(_location), sizeof(_location),
sjallouli 0:289fd2dae405 54 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ) {
sjallouli 0:289fd2dae405 55
sjallouli 0:289fd2dae405 56 GattCharacteristic *hrmChars[] = {&tempMeasurement, &tempLocation, };
sjallouli 0:289fd2dae405 57 GattService hrmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
sjallouli 0:289fd2dae405 58
sjallouli 0:289fd2dae405 59 ble.addService(hrmService);
sjallouli 0:289fd2dae405 60 }
sjallouli 0:289fd2dae405 61
sjallouli 0:289fd2dae405 62 void updateTemperature(float temperature) {
sjallouli 0:289fd2dae405 63 if (ble.getGapState().connected) {
sjallouli 0:289fd2dae405 64 valueBytes.updateTemperature(temperature);
sjallouli 0:289fd2dae405 65 ble.updateCharacteristicValue(tempMeasurement.getValueAttribute().getHandle(), valueBytes.getPointer(), sizeof(TemperatureValueBytes));
sjallouli 0:289fd2dae405 66 }
sjallouli 0:289fd2dae405 67 }
sjallouli 0:289fd2dae405 68
sjallouli 0:289fd2dae405 69 private:
sjallouli 0:289fd2dae405 70 /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */
sjallouli 0:289fd2dae405 71 struct TemperatureValueBytes {
sjallouli 0:289fd2dae405 72 static const unsigned OFFSET_OF_FLAGS = 0;
sjallouli 0:289fd2dae405 73 static const unsigned OFFSET_OF_VALUE = OFFSET_OF_FLAGS + sizeof(uint8_t);
sjallouli 0:289fd2dae405 74 static const unsigned SIZEOF_VALUE_BYTES = sizeof(uint8_t) + sizeof(float);
sjallouli 0:289fd2dae405 75
sjallouli 0:289fd2dae405 76 static const unsigned TEMPERATURE_UNITS_FLAG_POS = 0;
sjallouli 0:289fd2dae405 77 static const unsigned TIMESTAMP_FLAG_POS = 1;
sjallouli 0:289fd2dae405 78 static const unsigned TEMPERATURE_TYPE_FLAG_POS = 2;
sjallouli 0:289fd2dae405 79
sjallouli 0:289fd2dae405 80 static const uint8_t TEMPERATURE_UNITS_CELSIUS = 0;
sjallouli 0:289fd2dae405 81 static const uint8_t TEMPERATURE_UNITS_FAHRENHEIT = 1;
sjallouli 0:289fd2dae405 82
sjallouli 0:289fd2dae405 83 TemperatureValueBytes(float initialTemperature) : bytes() {
sjallouli 0:289fd2dae405 84 /* assumption: temperature values are expressed in Celsius */
sjallouli 0:289fd2dae405 85 bytes[OFFSET_OF_FLAGS] = (TEMPERATURE_UNITS_CELSIUS << TEMPERATURE_UNITS_FLAG_POS) |
sjallouli 0:289fd2dae405 86 (false << TIMESTAMP_FLAG_POS) |
sjallouli 0:289fd2dae405 87 (false << TEMPERATURE_TYPE_FLAG_POS);
sjallouli 0:289fd2dae405 88 updateTemperature(initialTemperature);
sjallouli 0:289fd2dae405 89 }
sjallouli 0:289fd2dae405 90
sjallouli 0:289fd2dae405 91 void updateTemperature(float temp) {
sjallouli 0:289fd2dae405 92 uint32_t temp_ieee11073 = quick_ieee11073_from_float(temp);
sjallouli 0:289fd2dae405 93 memcpy(&bytes[OFFSET_OF_VALUE], &temp_ieee11073, sizeof(float));
sjallouli 0:289fd2dae405 94 }
sjallouli 0:289fd2dae405 95
sjallouli 0:289fd2dae405 96 uint8_t *getPointer(void) {
sjallouli 0:289fd2dae405 97 return bytes;
sjallouli 0:289fd2dae405 98 }
sjallouli 0:289fd2dae405 99
sjallouli 0:289fd2dae405 100 const uint8_t *getPointer(void) const {
sjallouli 0:289fd2dae405 101 return bytes;
sjallouli 0:289fd2dae405 102 }
sjallouli 0:289fd2dae405 103
sjallouli 0:289fd2dae405 104 private:
sjallouli 0:289fd2dae405 105 /**
sjallouli 0:289fd2dae405 106 * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type.
sjallouli 0:289fd2dae405 107 * @param temperature The temperature as a float.
sjallouli 0:289fd2dae405 108 * @return The temperature in 11073-20601 FLOAT-Type format.
sjallouli 0:289fd2dae405 109 */
sjallouli 0:289fd2dae405 110 uint32_t quick_ieee11073_from_float(float temperature) {
sjallouli 0:289fd2dae405 111 uint8_t exponent = 0xFE; //exponent is -2
sjallouli 0:289fd2dae405 112 uint32_t mantissa = (uint32_t)(temperature * 100);
sjallouli 0:289fd2dae405 113
sjallouli 0:289fd2dae405 114 return (((uint32_t)exponent) << 24) | mantissa;
sjallouli 0:289fd2dae405 115 }
sjallouli 0:289fd2dae405 116
sjallouli 0:289fd2dae405 117
sjallouli 0:289fd2dae405 118 private:
sjallouli 0:289fd2dae405 119 /* First byte = 8-bit flags, Second field is a float holding the temperature value. */
sjallouli 0:289fd2dae405 120 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
sjallouli 0:289fd2dae405 121 uint8_t bytes[SIZEOF_VALUE_BYTES];
sjallouli 0:289fd2dae405 122 };
sjallouli 0:289fd2dae405 123
sjallouli 0:289fd2dae405 124 private:
sjallouli 0:289fd2dae405 125 BLEDevice &ble;
sjallouli 0:289fd2dae405 126 TemperatureValueBytes valueBytes;
sjallouli 0:289fd2dae405 127 GattCharacteristic tempMeasurement;
sjallouli 0:289fd2dae405 128 GattCharacteristic tempLocation;
sjallouli 0:289fd2dae405 129 };
sjallouli 0:289fd2dae405 130
sjallouli 0:289fd2dae405 131 #endif /* #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__*/