Jacob Rosenthal / BLE_API

Holla back

Fork of BLE_API by Bluetooth Low Energy

services/HealthThermometerService.h@123:d2cdf4ebe524, 2014-10-10 (annotated)

Committer:
jakerosenthal@gmail.com
Date:
Fri Oct 10 17:32:22 2014 -0700
Branch:
2chains
Revision:
123:d2cdf4ebe524
Parent:
118:620d28e7a1ba 
first attempt at chaining onconnect and ondisconnect

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Rohit Grover 118:620d28e7a1ba 1 /* mbed Microcontroller Library
Rohit Grover 118:620d28e7a1ba 2 * Copyright (c) 2006-2013 ARM Limited
Rohit Grover 118:620d28e7a1ba 3 *
Rohit Grover 118:620d28e7a1ba 4 * Licensed under the Apache License, Version 2.0 (the "License");
Rohit Grover 118:620d28e7a1ba 5 * you may not use this file except in compliance with the License.
Rohit Grover 118:620d28e7a1ba 6 * You may obtain a copy of the License at
Rohit Grover 118:620d28e7a1ba 7 *
Rohit Grover 118:620d28e7a1ba 8 * http://www.apache.org/licenses/LICENSE-2.0
Rohit Grover 118:620d28e7a1ba 9 *
Rohit Grover 118:620d28e7a1ba 10 * Unless required by applicable law or agreed to in writing, software
Rohit Grover 118:620d28e7a1ba 11 * distributed under the License is distributed on an "AS IS" BASIS,
Rohit Grover 118:620d28e7a1ba 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Rohit Grover 118:620d28e7a1ba 13 * See the License for the specific language governing permissions and
Rohit Grover 118:620d28e7a1ba 14 * limitations under the License.
Rohit Grover 118:620d28e7a1ba 15 */
Rohit Grover 118:620d28e7a1ba 16
Rohit Grover 118:620d28e7a1ba 17 #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__
Rohit Grover 118:620d28e7a1ba 18 #define __BLE_HEALTH_THERMOMETER_SERVICE_H__
Rohit Grover 118:620d28e7a1ba 19
Rohit Grover 118:620d28e7a1ba 20 #include "BLEDevice.h"
Rohit Grover 118:620d28e7a1ba 21
Rohit Grover 118:620d28e7a1ba 22 /* Health Thermometer Service */
Rohit Grover 118:620d28e7a1ba 23 /* Service: https://developer.bluetooth.org/gatt/profiles/Pages/ProfileViewer.aspx?u=org.bluetooth.profile.health_thermometer.xml */
Rohit Grover 118:620d28e7a1ba 24 /* Temperature Measurement: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
Rohit Grover 118:620d28e7a1ba 25 /* Temperature Type: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_type.xml */
Rohit Grover 118:620d28e7a1ba 26 class HealthThermometerService {
Rohit Grover 118:620d28e7a1ba 27 public:
Rohit Grover 118:620d28e7a1ba 28 enum {
Rohit Grover 118:620d28e7a1ba 29 LOCATION_ARMPIT = 1,
Rohit Grover 118:620d28e7a1ba 30 LOCATION_BODY,
Rohit Grover 118:620d28e7a1ba 31 LOCATION_EAR,
Rohit Grover 118:620d28e7a1ba 32 LOCATION_FINGER,
Rohit Grover 118:620d28e7a1ba 33 LOCATION_GI_TRACT,
Rohit Grover 118:620d28e7a1ba 34 LOCATION_MOUTH,
Rohit Grover 118:620d28e7a1ba 35 LOCATION_RECTUM,
Rohit Grover 118:620d28e7a1ba 36 LOCATION_TOE,
Rohit Grover 118:620d28e7a1ba 37 LOCATION_EAR_DRUM,
Rohit Grover 118:620d28e7a1ba 38 };
Rohit Grover 118:620d28e7a1ba 39
Rohit Grover 118:620d28e7a1ba 40 public:
Rohit Grover 118:620d28e7a1ba 41
Rohit Grover 118:620d28e7a1ba 42 /**
Rohit Grover 118:620d28e7a1ba 43 * @param[in] _ble reference to the BLE device
Rohit Grover 118:620d28e7a1ba 44 * @param[in] initialTemp initial value in celsius
Rohit Grover 118:620d28e7a1ba 45 * @param[in] _location
Rohit Grover 118:620d28e7a1ba 46 */
Rohit Grover 118:620d28e7a1ba 47 HealthThermometerService(BLEDevice &_ble, float initialTemp, uint8_t _location) :
Rohit Grover 118:620d28e7a1ba 48 ble(_ble),
Rohit Grover 118:620d28e7a1ba 49 valueBytes(initialTemp),
Rohit Grover 118:620d28e7a1ba 50 tempMeasurement(GattCharacteristic::UUID_TEMPERATURE_MEASUREMENT_CHAR, valueBytes.getPointer(),
Rohit Grover 118:620d28e7a1ba 51 sizeof(TemperatureValueBytes), sizeof(TemperatureValueBytes),
Rohit Grover 118:620d28e7a1ba 52 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
Rohit Grover 118:620d28e7a1ba 53 tempLocation(GattCharacteristic::UUID_TEMPERATURE_TYPE_CHAR, (uint8_t *)&_location, sizeof(_location), sizeof(_location),
Rohit Grover 118:620d28e7a1ba 54 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ) {
Rohit Grover 118:620d28e7a1ba 55
Rohit Grover 118:620d28e7a1ba 56 GattCharacteristic *hrmChars[] = {&tempMeasurement, &tempLocation, };
Rohit Grover 118:620d28e7a1ba 57 GattService hrmService(GattService::UUID_HEALTH_THERMOMETER_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
Rohit Grover 118:620d28e7a1ba 58
Rohit Grover 118:620d28e7a1ba 59 ble.addService(hrmService);
Rohit Grover 118:620d28e7a1ba 60 }
Rohit Grover 118:620d28e7a1ba 61
Rohit Grover 118:620d28e7a1ba 62 void updateTemperature(float temperature) {
Rohit Grover 118:620d28e7a1ba 63 if (ble.getGapState().connected) {
Rohit Grover 118:620d28e7a1ba 64 valueBytes.updateTemperature(temperature);
Rohit Grover 118:620d28e7a1ba 65 ble.updateCharacteristicValue(tempMeasurement.getValueAttribute().getHandle(), valueBytes.getPointer(), sizeof(TemperatureValueBytes));
Rohit Grover 118:620d28e7a1ba 66 }
Rohit Grover 118:620d28e7a1ba 67 }
Rohit Grover 118:620d28e7a1ba 68
Rohit Grover 118:620d28e7a1ba 69 private:
Rohit Grover 118:620d28e7a1ba 70 /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */
Rohit Grover 118:620d28e7a1ba 71 struct TemperatureValueBytes {
Rohit Grover 118:620d28e7a1ba 72 static const unsigned OFFSET_OF_FLAGS = 0;
Rohit Grover 118:620d28e7a1ba 73 static const unsigned OFFSET_OF_VALUE = OFFSET_OF_FLAGS + sizeof(uint8_t);
Rohit Grover 118:620d28e7a1ba 74 static const unsigned SIZEOF_VALUE_BYTES = sizeof(uint8_t) + sizeof(float);
Rohit Grover 118:620d28e7a1ba 75
Rohit Grover 118:620d28e7a1ba 76 static const unsigned TEMPERATURE_UNITS_FLAG_POS = 0;
Rohit Grover 118:620d28e7a1ba 77 static const unsigned TIMESTAMP_FLAG_POS = 1;
Rohit Grover 118:620d28e7a1ba 78 static const unsigned TEMPERATURE_TYPE_FLAG_POS = 2;
Rohit Grover 118:620d28e7a1ba 79
Rohit Grover 118:620d28e7a1ba 80 static const uint8_t TEMPERATURE_UNITS_CELSIUS = 0;
Rohit Grover 118:620d28e7a1ba 81 static const uint8_t TEMPERATURE_UNITS_FAHRENHEIT = 1;
Rohit Grover 118:620d28e7a1ba 82
Rohit Grover 118:620d28e7a1ba 83 TemperatureValueBytes(float initialTemperature) : bytes() {
Rohit Grover 118:620d28e7a1ba 84 /* assumption: temperature values are expressed in Celsius */
Rohit Grover 118:620d28e7a1ba 85 bytes[OFFSET_OF_FLAGS] = (TEMPERATURE_UNITS_CELSIUS << TEMPERATURE_UNITS_FLAG_POS) |
Rohit Grover 118:620d28e7a1ba 86 (false << TIMESTAMP_FLAG_POS) |
Rohit Grover 118:620d28e7a1ba 87 (false << TEMPERATURE_TYPE_FLAG_POS);
Rohit Grover 118:620d28e7a1ba 88 updateTemperature(initialTemperature);
Rohit Grover 118:620d28e7a1ba 89 }
Rohit Grover 118:620d28e7a1ba 90
Rohit Grover 118:620d28e7a1ba 91 void updateTemperature(float temp) {
Rohit Grover 118:620d28e7a1ba 92 uint32_t temp_ieee11073 = quick_ieee11073_from_float(temp);
Rohit Grover 118:620d28e7a1ba 93 memcpy(&bytes[OFFSET_OF_VALUE], &temp_ieee11073, sizeof(float));
Rohit Grover 118:620d28e7a1ba 94 }
Rohit Grover 118:620d28e7a1ba 95
Rohit Grover 118:620d28e7a1ba 96 uint8_t *getPointer(void) {
Rohit Grover 118:620d28e7a1ba 97 return bytes;
Rohit Grover 118:620d28e7a1ba 98 }
Rohit Grover 118:620d28e7a1ba 99
Rohit Grover 118:620d28e7a1ba 100 const uint8_t *getPointer(void) const {
Rohit Grover 118:620d28e7a1ba 101 return bytes;
Rohit Grover 118:620d28e7a1ba 102 }
Rohit Grover 118:620d28e7a1ba 103
Rohit Grover 118:620d28e7a1ba 104 private:
Rohit Grover 118:620d28e7a1ba 105 /**
Rohit Grover 118:620d28e7a1ba 106 * @brief A very quick conversion between a float temperature and 11073-20601 FLOAT-Type.
Rohit Grover 118:620d28e7a1ba 107 * @param temperature The temperature as a float.
Rohit Grover 118:620d28e7a1ba 108 * @return The temperature in 11073-20601 FLOAT-Type format.
Rohit Grover 118:620d28e7a1ba 109 */
Rohit Grover 118:620d28e7a1ba 110 uint32_t quick_ieee11073_from_float(float temperature) {
Rohit Grover 118:620d28e7a1ba 111 uint8_t exponent = 0xFE; //exponent is -2
Rohit Grover 118:620d28e7a1ba 112 uint32_t mantissa = (uint32_t)(temperature * 100);
Rohit Grover 118:620d28e7a1ba 113
Rohit Grover 118:620d28e7a1ba 114 return (((uint32_t)exponent) << 24) | mantissa;
Rohit Grover 118:620d28e7a1ba 115 }
Rohit Grover 118:620d28e7a1ba 116
Rohit Grover 118:620d28e7a1ba 117
Rohit Grover 118:620d28e7a1ba 118 private:
Rohit Grover 118:620d28e7a1ba 119 /* First byte = 8-bit flags, Second field is a float holding the temperature value. */
Rohit Grover 118:620d28e7a1ba 120 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.temperature_measurement.xml */
Rohit Grover 118:620d28e7a1ba 121 uint8_t bytes[SIZEOF_VALUE_BYTES];
Rohit Grover 118:620d28e7a1ba 122 };
Rohit Grover 118:620d28e7a1ba 123
Rohit Grover 118:620d28e7a1ba 124 private:
Rohit Grover 118:620d28e7a1ba 125 BLEDevice &ble;
Rohit Grover 118:620d28e7a1ba 126 TemperatureValueBytes valueBytes;
Rohit Grover 118:620d28e7a1ba 127 GattCharacteristic tempMeasurement;
Rohit Grover 118:620d28e7a1ba 128 GattCharacteristic tempLocation;
Rohit Grover 118:620d28e7a1ba 129 };
Rohit Grover 118:620d28e7a1ba 130
Rohit Grover 118:620d28e7a1ba 131 #endif /* #ifndef __BLE_HEALTH_THERMOMETER_SERVICE_H__*/