wanjun chen / Nucleo_BLE_API_IOTIO

IOTIO

Fork of Nucleo_BLE_API by ST Americas mbed Team

services/HeartRateService.h@2:584d5bedac75, 2016-10-29 (annotated)

Committer:
16038618
Date:
Sat Oct 29 14:16:12 2016 +0000
Revision:
2:584d5bedac75
Parent:
0:289fd2dae405 
IOTIO

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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_HEART_RATE_SERVICE_H__
sjallouli 0:289fd2dae405 18 #define __BLE_HEART_RATE_SERVICE_H__
sjallouli 0:289fd2dae405 19
sjallouli 0:289fd2dae405 20 #include "BLEDevice.h"
sjallouli 0:289fd2dae405 21
sjallouli 0:289fd2dae405 22 /* Heart Rate Service */
sjallouli 0:289fd2dae405 23 /* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
sjallouli 0:289fd2dae405 24 /* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
sjallouli 0:289fd2dae405 25 /* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
sjallouli 0:289fd2dae405 26 class HeartRateService {
sjallouli 0:289fd2dae405 27 public:
sjallouli 0:289fd2dae405 28 enum {
sjallouli 0:289fd2dae405 29 LOCATION_OTHER = 0,
sjallouli 0:289fd2dae405 30 LOCATION_CHEST,
sjallouli 0:289fd2dae405 31 LOCATION_WRIST,
sjallouli 0:289fd2dae405 32 LOCATION_FINGER,
sjallouli 0:289fd2dae405 33 LOCATION_HAND,
sjallouli 0:289fd2dae405 34 LOCATION_EAR_LOBE,
sjallouli 0:289fd2dae405 35 LOCATION_FOOT,
sjallouli 0:289fd2dae405 36 };
sjallouli 0:289fd2dae405 37
sjallouli 0:289fd2dae405 38 public:
sjallouli 0:289fd2dae405 39 /**
sjallouli 0:289fd2dae405 40 * Constructor.
sjallouli 0:289fd2dae405 41 *
sjallouli 0:289fd2dae405 42 * param[in] _ble
sjallouli 0:289fd2dae405 43 * Reference to the underlying BLEDevice.
sjallouli 0:289fd2dae405 44 * param[in] hrmCounter (8-bit)
sjallouli 0:289fd2dae405 45 * initial value for the hrm counter.
sjallouli 0:289fd2dae405 46 * param[in] location
sjallouli 0:289fd2dae405 47 * Sensor's location.
sjallouli 0:289fd2dae405 48 */
sjallouli 0:289fd2dae405 49 HeartRateService(BLEDevice &_ble, uint8_t hrmCounter, uint8_t location) :
sjallouli 0:289fd2dae405 50 ble(_ble),
sjallouli 0:289fd2dae405 51 valueBytes(hrmCounter),
sjallouli 0:289fd2dae405 52 hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, valueBytes.getPointer(),
sjallouli 0:289fd2dae405 53 valueBytes.getNumValueBytes(), HeartRateValueBytes::MAX_VALUE_BYTES,
sjallouli 0:289fd2dae405 54 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
sjallouli 0:289fd2dae405 55 hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, (uint8_t *)&location, sizeof(location), sizeof(location),
sjallouli 0:289fd2dae405 56 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ),
sjallouli 0:289fd2dae405 57 controlPoint(GattCharacteristic::UUID_HEART_RATE_CONTROL_POINT_CHAR, (uint8_t *)&controlPointValue,
sjallouli 0:289fd2dae405 58 sizeof(controlPointValue), sizeof(controlPointValue), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE) {
sjallouli 0:289fd2dae405 59 setupService();
sjallouli 0:289fd2dae405 60 }
sjallouli 0:289fd2dae405 61
sjallouli 0:289fd2dae405 62 /**
sjallouli 0:289fd2dae405 63 * Same constructor as above, but with a 16-bit HRM Counter value.
sjallouli 0:289fd2dae405 64 */
sjallouli 0:289fd2dae405 65 HeartRateService(BLEDevice &_ble, uint16_t hrmCounter, uint8_t location) :
sjallouli 0:289fd2dae405 66 ble(_ble),
sjallouli 0:289fd2dae405 67 valueBytes(hrmCounter),
sjallouli 0:289fd2dae405 68 hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, valueBytes.getPointer(),
sjallouli 0:289fd2dae405 69 valueBytes.getNumValueBytes(), HeartRateValueBytes::MAX_VALUE_BYTES,
sjallouli 0:289fd2dae405 70 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
sjallouli 0:289fd2dae405 71 hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, (uint8_t *)&location, sizeof(location), sizeof(location),
sjallouli 0:289fd2dae405 72 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ),
sjallouli 0:289fd2dae405 73 controlPoint(GattCharacteristic::UUID_HEART_RATE_CONTROL_POINT_CHAR, (uint8_t *)&controlPointValue,
sjallouli 0:289fd2dae405 74 sizeof(controlPointValue), sizeof(controlPointValue), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE) {
sjallouli 0:289fd2dae405 75 setupService();
sjallouli 0:289fd2dae405 76 }
sjallouli 0:289fd2dae405 77
sjallouli 0:289fd2dae405 78 /**
sjallouli 0:289fd2dae405 79 * Set a new 8-bit value for heart rate.
sjallouli 0:289fd2dae405 80 */
sjallouli 0:289fd2dae405 81 void updateHeartRate(uint8_t hrmCounter) {
sjallouli 0:289fd2dae405 82 valueBytes.updateHeartRate(hrmCounter);
sjallouli 0:289fd2dae405 83 ble.updateCharacteristicValue(hrmRate.getValueAttribute().getHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
sjallouli 0:289fd2dae405 84 }
sjallouli 0:289fd2dae405 85
sjallouli 0:289fd2dae405 86 /**
sjallouli 0:289fd2dae405 87 * Set a new 16-bit value for heart rate.
sjallouli 0:289fd2dae405 88 */
sjallouli 0:289fd2dae405 89 void updateHeartRate(uint16_t hrmCounter) {
sjallouli 0:289fd2dae405 90 valueBytes.updateHeartRate(hrmCounter);
sjallouli 0:289fd2dae405 91 ble.updateCharacteristicValue(hrmRate.getValueAttribute().getHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
sjallouli 0:289fd2dae405 92 }
sjallouli 0:289fd2dae405 93
sjallouli 0:289fd2dae405 94 /**
sjallouli 0:289fd2dae405 95 * This callback allows the UART service to receive updates to the
sjallouli 0:289fd2dae405 96 * txCharacteristic. The application should forward the call to this
sjallouli 0:289fd2dae405 97 * function from the global onDataWritten() callback handler; or if that's
sjallouli 0:289fd2dae405 98 * not used, this method can be used as a callback directly.
sjallouli 0:289fd2dae405 99 */
sjallouli 0:289fd2dae405 100 virtual void onDataWritten(const GattCharacteristicWriteCBParams *params) {
sjallouli 0:289fd2dae405 101 if (params->charHandle == controlPoint.getValueAttribute().getHandle()) {
sjallouli 0:289fd2dae405 102 /* Do something here if the new value is 1; else you can override this method by
sjallouli 0:289fd2dae405 103 * extending this class.
sjallouli 0:289fd2dae405 104 * @NOTE: if you are extending this class, be sure to also call
sjallouli 0:289fd2dae405 105 * ble.onDataWritten(this, &ExtendedHRService::onDataWritten); in
sjallouli 0:289fd2dae405 106 * your constructor.
sjallouli 0:289fd2dae405 107 */
sjallouli 0:289fd2dae405 108 }
sjallouli 0:289fd2dae405 109 }
sjallouli 0:289fd2dae405 110
sjallouli 0:289fd2dae405 111 private:
sjallouli 0:289fd2dae405 112 void setupService(void) {
sjallouli 0:289fd2dae405 113 static bool serviceAdded = false; /* We should only ever need to add the heart rate service once. */
sjallouli 0:289fd2dae405 114 if (serviceAdded) {
sjallouli 0:289fd2dae405 115 return;
sjallouli 0:289fd2dae405 116 }
sjallouli 0:289fd2dae405 117
sjallouli 0:289fd2dae405 118 GattCharacteristic *charTable[] = {&hrmRate, &hrmLocation, &controlPoint};
sjallouli 0:289fd2dae405 119 GattService hrmService(GattService::UUID_HEART_RATE_SERVICE, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
sjallouli 0:289fd2dae405 120
sjallouli 0:289fd2dae405 121 ble.addService(hrmService);
sjallouli 0:289fd2dae405 122 serviceAdded = true;
sjallouli 0:289fd2dae405 123
sjallouli 0:289fd2dae405 124 ble.onDataWritten(this, &HeartRateService::onDataWritten);
sjallouli 0:289fd2dae405 125 }
sjallouli 0:289fd2dae405 126
sjallouli 0:289fd2dae405 127 private:
sjallouli 0:289fd2dae405 128 /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */
sjallouli 0:289fd2dae405 129 struct HeartRateValueBytes {
sjallouli 0:289fd2dae405 130 static const unsigned MAX_VALUE_BYTES = 3; /* FLAGS + up to two bytes for heart-rate */
sjallouli 0:289fd2dae405 131 static const unsigned FLAGS_BYTE_INDEX = 0;
sjallouli 0:289fd2dae405 132
sjallouli 0:289fd2dae405 133 static const unsigned VALUE_FORMAT_BITNUM = 0;
sjallouli 0:289fd2dae405 134 static const uint8_t VALUE_FORMAT_FLAG = (1 << VALUE_FORMAT_BITNUM);
sjallouli 0:289fd2dae405 135
sjallouli 0:289fd2dae405 136 HeartRateValueBytes(uint8_t hrmCounter) : valueBytes() {
sjallouli 0:289fd2dae405 137 updateHeartRate(hrmCounter);
sjallouli 0:289fd2dae405 138 }
sjallouli 0:289fd2dae405 139
sjallouli 0:289fd2dae405 140 HeartRateValueBytes(uint16_t hrmCounter) : valueBytes() {
sjallouli 0:289fd2dae405 141 updateHeartRate(hrmCounter);
sjallouli 0:289fd2dae405 142 }
sjallouli 0:289fd2dae405 143
sjallouli 0:289fd2dae405 144 void updateHeartRate(uint8_t hrmCounter) {
sjallouli 0:289fd2dae405 145 valueBytes[FLAGS_BYTE_INDEX] &= ~VALUE_FORMAT_FLAG;
sjallouli 0:289fd2dae405 146 valueBytes[FLAGS_BYTE_INDEX + 1] = hrmCounter;
sjallouli 0:289fd2dae405 147 }
sjallouli 0:289fd2dae405 148
sjallouli 0:289fd2dae405 149 void updateHeartRate(uint16_t hrmCounter) {
sjallouli 0:289fd2dae405 150 valueBytes[FLAGS_BYTE_INDEX] |= VALUE_FORMAT_FLAG;
sjallouli 0:289fd2dae405 151 valueBytes[FLAGS_BYTE_INDEX + 1] = (uint8_t)(hrmCounter & 0xFF);
sjallouli 0:289fd2dae405 152 valueBytes[FLAGS_BYTE_INDEX + 2] = (uint8_t)(hrmCounter >> 8);
sjallouli 0:289fd2dae405 153 }
sjallouli 0:289fd2dae405 154
sjallouli 0:289fd2dae405 155 uint8_t *getPointer(void) {
sjallouli 0:289fd2dae405 156 return valueBytes;
sjallouli 0:289fd2dae405 157 }
sjallouli 0:289fd2dae405 158
sjallouli 0:289fd2dae405 159 const uint8_t *getPointer(void) const {
sjallouli 0:289fd2dae405 160 return valueBytes;
sjallouli 0:289fd2dae405 161 }
sjallouli 0:289fd2dae405 162
sjallouli 0:289fd2dae405 163 unsigned getNumValueBytes(void) const {
sjallouli 0:289fd2dae405 164 return 1 + ((valueBytes[FLAGS_BYTE_INDEX] & VALUE_FORMAT_FLAG) ? sizeof(uint16_t) : sizeof(uint8_t));
sjallouli 0:289fd2dae405 165 }
sjallouli 0:289fd2dae405 166
sjallouli 0:289fd2dae405 167 private:
sjallouli 0:289fd2dae405 168 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
sjallouli 0:289fd2dae405 169 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
sjallouli 0:289fd2dae405 170 uint8_t valueBytes[MAX_VALUE_BYTES];
sjallouli 0:289fd2dae405 171 };
sjallouli 0:289fd2dae405 172
sjallouli 0:289fd2dae405 173 private:
sjallouli 0:289fd2dae405 174 BLEDevice &ble;
sjallouli 0:289fd2dae405 175 HeartRateValueBytes valueBytes;
sjallouli 0:289fd2dae405 176 uint8_t controlPointValue;
sjallouli 0:289fd2dae405 177 GattCharacteristic hrmRate;
sjallouli 0:289fd2dae405 178 GattCharacteristic hrmLocation;
sjallouli 0:289fd2dae405 179 GattCharacteristic controlPoint;
sjallouli 0:289fd2dae405 180 };
sjallouli 0:289fd2dae405 181
sjallouli 0:289fd2dae405 182 #endif /* #ifndef __BLE_HEART_RATE_SERVICE_H__*/