Microbug / BLE_API_FOTA

Lightly modified version of the BLE stack, that doesn't bring up a DFUService by default... as we have our own.

Fork of BLE_API by Bluetooth Low Energy

services/HealthThermometerService.h@118:620d28e7a1ba, 2014-09-22 (annotated)

Committer:
Rohit Grover
Date:
Mon Sep 22 10:59:09 2014 +0100
Revision:
118:620d28e7a1ba
Child:
235:448f29f4ae7f
Release 0.2.0

=============



Highlights:

  Introducing standard services to simplify applications.

  Add support for over-the-air firmware updates.



Features

~~~~~~~~



- This release introduces 'templates' for common services such as heart-rate,

  battery-level, device-info, UART, device-firmware-update etc. These services

  take the shape of class declarations within header files aggregated under a

  new folder called 'services/'. These service-classes provide a high-level

  API hopefully easing the burden of developing BLE applications. The

  underlying APIs to work with characteristics and services are still

  available to allow greater control if needed. We expect to grow the

  supported services to include all SIG defined BLE profiles.



- WriteCallbackParams now includes the characteristic's value-attribute

  handle; this changes the signature of onDataWritten().



- BLEDevice::onDataWritten() now allows chaining of callbacks--this means that

  it is possible to chain together multiple onDataWritten callbacks

  (potentially from different modules of an application) to receive updates to

  characteristics. Many services, such as DFU and UART add their own

  onDataWritten callbacks behind the scenes to trap interesting events. It is

  also possible to chain callbacks to functions within objects.



- Added the following expectation for GattCharacteristic: If valuePtr ==

  NULL, initialLength == 0, and properties == READ for the value attribute of

  a characteristic, then that particular characteristic may be considered

  optional and dropped while instantiating the service with the underlying BLE

  stack.



- Introducing the typedef GattAttribute::Handle_t to capture Attribute handles.



Bugfixes

~~~~~~~~



None.



Compatibility

~~~~~~~~~~~~~



The signature of onDataWritten() has seen a change; so application programs

using this new version of the BLE API will need minor modifications. Please

refer to sample programs under BLE team page.

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__*/