James Crosby / Mbed 2 deprecated BLE_HeartRate

BLE heart rate example, with yotta machinations.

Dependencies:   BLE_API mbed nRF51822

Fork of BLE_HeartRate by Bluetooth Low Energy

main.cpp@5:b0baff4a124f, 2014-05-29 (annotated)

Committer:
Rohit Grover
Date:
Thu May 29 09:58:58 2014 +0100
Revision:
5:b0baff4a124f
Parent:
4:12890f3c62eb
Child:
7:daab8ba5139e
use accessor methods to get handle for characteristics

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ktownsend 0:87a7fc231fae 1 /* mbed Microcontroller Library
ktownsend 0:87a7fc231fae 2 * Copyright (c) 2006-2013 ARM Limited
ktownsend 0:87a7fc231fae 3 *
ktownsend 0:87a7fc231fae 4 * Licensed under the Apache License, Version 2.0 (the "License");
ktownsend 0:87a7fc231fae 5 * you may not use this file except in compliance with the License.
ktownsend 0:87a7fc231fae 6 * You may obtain a copy of the License at
ktownsend 0:87a7fc231fae 7 *
ktownsend 0:87a7fc231fae 8 * http://www.apache.org/licenses/LICENSE-2.0
ktownsend 0:87a7fc231fae 9 *
ktownsend 0:87a7fc231fae 10 * Unless required by applicable law or agreed to in writing, software
ktownsend 0:87a7fc231fae 11 * distributed under the License is distributed on an "AS IS" BASIS,
ktownsend 0:87a7fc231fae 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ktownsend 0:87a7fc231fae 13 * See the License for the specific language governing permissions and
ktownsend 0:87a7fc231fae 14 * limitations under the License.
ktownsend 0:87a7fc231fae 15 */
ktownsend 0:87a7fc231fae 16
ktownsend 0:87a7fc231fae 17 #include "mbed.h"
ktownsend 0:87a7fc231fae 18 #include "nRF51822n.h"
ktownsend 0:87a7fc231fae 19
Rohit Grover 3:24e2b056d229 20 nRF51822n nrf; /* BLE radio driver */
ktownsend 0:87a7fc231fae 21
Rohit Grover 3:24e2b056d229 22 DigitalOut led1(LED1);
Rohit Grover 3:24e2b056d229 23 DigitalOut led2(LED2);
Rohit Grover 3:24e2b056d229 24 Ticker flipper;
Rohit Grover 3:24e2b056d229 25 Serial pc(USBTX, USBRX);
ktownsend 0:87a7fc231fae 26
ktownsend 0:87a7fc231fae 27 /* Battery Level Service */
Rohit Grover 3:24e2b056d229 28 uint8_t batt = 72; /* Battery level */
ktownsend 0:87a7fc231fae 29 uint8_t read_batt = 0; /* Variable to hold battery level reads */
Rohit Grover 3:24e2b056d229 30 GattService battService (GattService::UUID_BATTERY_SERVICE);
Rohit Grover 3:24e2b056d229 31 GattCharacteristic battLevel (GattCharacteristic::UUID_BATTERY_LEVEL_CHAR,
Rohit Grover 3:24e2b056d229 32 1,
Rohit Grover 3:24e2b056d229 33 1,
Rohit Grover 3:24e2b056d229 34 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY |
Rohit Grover 3:24e2b056d229 35 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 36
ktownsend 0:87a7fc231fae 37 /* Heart Rate Service */
ktownsend 0:87a7fc231fae 38 /* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
ktownsend 0:87a7fc231fae 39 /* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
ktownsend 0:87a7fc231fae 40 /* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 3:24e2b056d229 41 GattService hrmService (GattService::UUID_HEART_RATE_SERVICE);
Rohit Grover 3:24e2b056d229 42 GattCharacteristic hrmRate (
Rohit Grover 3:24e2b056d229 43 GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR,
Rohit Grover 3:24e2b056d229 44 2,
Rohit Grover 3:24e2b056d229 45 3,
Rohit Grover 3:24e2b056d229 46 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
Rohit Grover 3:24e2b056d229 47 GattCharacteristic hrmLocation (
Rohit Grover 3:24e2b056d229 48 GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR,
Rohit Grover 3:24e2b056d229 49 1,
Rohit Grover 3:24e2b056d229 50 1,
Rohit Grover 3:24e2b056d229 51 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 52
ktownsend 0:87a7fc231fae 53 /* Device Information service */
Rohit Grover 3:24e2b056d229 54 uint8_t deviceName[4] = {'m', 'b', 'e', 'd'};
Rohit Grover 3:24e2b056d229 55 GattService deviceInformationService (
Rohit Grover 3:24e2b056d229 56 GattService::UUID_DEVICE_INFORMATION_SERVICE);
Rohit Grover 3:24e2b056d229 57 GattCharacteristic deviceManufacturer (
Rohit Grover 3:24e2b056d229 58 GattCharacteristic::UUID_MANUFACTURER_NAME_STRING_CHAR,
Rohit Grover 3:24e2b056d229 59 sizeof(deviceName),
Rohit Grover 3:24e2b056d229 60 sizeof(deviceName),
Rohit Grover 3:24e2b056d229 61 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 62
ktownsend 0:87a7fc231fae 63 /* Advertising data and parameters */
Rohit Grover 3:24e2b056d229 64 GapAdvertisingData advData;
Rohit Grover 3:24e2b056d229 65 GapAdvertisingData scanResponse;
Rohit Grover 3:24e2b056d229 66 GapAdvertisingParams advParams (GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
Rohit Grover 3:24e2b056d229 67 uint16_t uuid16_list[] = {GattService::UUID_BATTERY_SERVICE,
Rohit Grover 3:24e2b056d229 68 GattService::UUID_DEVICE_INFORMATION_SERVICE,
Rohit Grover 3:24e2b056d229 69 GattService::UUID_HEART_RATE_SERVICE};
ktownsend 0:87a7fc231fae 70
ktownsend 0:87a7fc231fae 71 void tickerCallback(void);
ktownsend 0:87a7fc231fae 72
ktownsend 0:87a7fc231fae 73 /**************************************************************************/
ktownsend 0:87a7fc231fae 74 /*!
ktownsend 0:87a7fc231fae 75 @brief This custom class can be used to override any GapEvents
ktownsend 0:87a7fc231fae 76 that you are interested in handling on an application level.
ktownsend 0:87a7fc231fae 77 */
ktownsend 0:87a7fc231fae 78 /**************************************************************************/
ktownsend 0:87a7fc231fae 79 class GapEventHandler : public GapEvents
ktownsend 0:87a7fc231fae 80 {
Rohit Grover 3:24e2b056d229 81 virtual void onTimeout(void)
ktownsend 0:87a7fc231fae 82 {
ktownsend 0:87a7fc231fae 83 pc.printf("Advertising Timeout!\n\r");
ktownsend 0:87a7fc231fae 84 // Restart the advertising process with a much slower interval,
ktownsend 0:87a7fc231fae 85 // only start advertising again after a button press, etc.
Rohit Grover 3:24e2b056d229 86 }
ktownsend 0:87a7fc231fae 87
ktownsend 0:87a7fc231fae 88 virtual void onConnected(void)
ktownsend 0:87a7fc231fae 89 {
ktownsend 0:87a7fc231fae 90 pc.printf("Connected!\n\r");
ktownsend 0:87a7fc231fae 91 }
ktownsend 0:87a7fc231fae 92
ktownsend 0:87a7fc231fae 93 virtual void onDisconnected(void)
ktownsend 0:87a7fc231fae 94 {
ktownsend 0:87a7fc231fae 95 pc.printf("Disconnected!\n\r");
ktownsend 0:87a7fc231fae 96 pc.printf("Restarting the advertising process\n\r");
ktownsend 0:87a7fc231fae 97 nrf.getGap().startAdvertising(advParams);
ktownsend 0:87a7fc231fae 98 }
ktownsend 0:87a7fc231fae 99 };
ktownsend 0:87a7fc231fae 100
ktownsend 0:87a7fc231fae 101 /**************************************************************************/
ktownsend 0:87a7fc231fae 102 /*!
ktownsend 0:87a7fc231fae 103 @brief This custom class can be used to override any GattServerEvents
ktownsend 0:87a7fc231fae 104 that you are interested in handling on an application level.
ktownsend 0:87a7fc231fae 105 */
ktownsend 0:87a7fc231fae 106 /**************************************************************************/
ktownsend 0:87a7fc231fae 107 class GattServerEventHandler : public GattServerEvents
ktownsend 0:87a7fc231fae 108 {
ktownsend 0:87a7fc231fae 109 //virtual void onDataSent(uint16_t charHandle) {}
ktownsend 0:87a7fc231fae 110 //virtual void onDataWritten(uint16_t charHandle) {}
Rohit Grover 3:24e2b056d229 111
ktownsend 0:87a7fc231fae 112 virtual void onUpdatesEnabled(uint16_t charHandle)
ktownsend 0:87a7fc231fae 113 {
Rohit Grover 5:b0baff4a124f 114 if (charHandle == hrmRate.getHandle()) {
Rohit Grover 3:24e2b056d229 115 pc.printf("Heart rate notify enabled\n\r");
Rohit Grover 3:24e2b056d229 116 }
ktownsend 0:87a7fc231fae 117 }
ktownsend 0:87a7fc231fae 118
ktownsend 0:87a7fc231fae 119 virtual void onUpdatesDisabled(uint16_t charHandle)
ktownsend 0:87a7fc231fae 120 {
Rohit Grover 5:b0baff4a124f 121 if (charHandle == hrmRate.getHandle()) {
Rohit Grover 3:24e2b056d229 122 pc.printf("Heart rate notify disabled\n\r");
Rohit Grover 3:24e2b056d229 123 }
ktownsend 0:87a7fc231fae 124 }
ktownsend 0:87a7fc231fae 125
ktownsend 0:87a7fc231fae 126 //virtual void onConfirmationReceived(uint16_t charHandle) {}
ktownsend 0:87a7fc231fae 127 };
ktownsend 0:87a7fc231fae 128
ktownsend 0:87a7fc231fae 129 /**************************************************************************/
ktownsend 0:87a7fc231fae 130 /*!
ktownsend 0:87a7fc231fae 131 @brief Program entry point
ktownsend 0:87a7fc231fae 132 */
ktownsend 0:87a7fc231fae 133 /**************************************************************************/
ktownsend 0:87a7fc231fae 134 int main(void)
ktownsend 0:87a7fc231fae 135 {
ktownsend 0:87a7fc231fae 136 /* Setup blinky: led1 is toggled in main, led2 is toggled via Ticker */
Rohit Grover 3:24e2b056d229 137 led1 = 1;
Rohit Grover 3:24e2b056d229 138 led2 = 1;
ktownsend 0:87a7fc231fae 139 flipper.attach(&tickerCallback, 1.0);
ktownsend 0:87a7fc231fae 140
ktownsend 0:87a7fc231fae 141 /* Setup the local GAP/GATT event handlers */
ktownsend 0:87a7fc231fae 142 nrf.getGap().setEventHandler(new GapEventHandler());
ktownsend 0:87a7fc231fae 143 nrf.getGattServer().setEventHandler(new GattServerEventHandler());
ktownsend 0:87a7fc231fae 144
ktownsend 0:87a7fc231fae 145 /* Initialise the nRF51822 */
ktownsend 0:87a7fc231fae 146 pc.printf("Initialising the nRF51822\n\r");
ktownsend 0:87a7fc231fae 147 nrf.init();
ktownsend 0:87a7fc231fae 148
ktownsend 0:87a7fc231fae 149 /* Make sure we get a clean start */
ktownsend 0:87a7fc231fae 150 nrf.reset();
ktownsend 0:87a7fc231fae 151
ktownsend 0:87a7fc231fae 152 /* Add BLE-Only flag and complete service list to the advertising data */
ktownsend 0:87a7fc231fae 153 advData.addFlags(GapAdvertisingData::BREDR_NOT_SUPPORTED);
Rohit Grover 3:24e2b056d229 154 advData.addData(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS,
Rohit Grover 3:24e2b056d229 155 (uint8_t *)uuid16_list, sizeof(uuid16_list));
ktownsend 0:87a7fc231fae 156 advData.addAppearance(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
ktownsend 0:87a7fc231fae 157 nrf.getGap().setAdvertisingData(advData, scanResponse);
ktownsend 0:87a7fc231fae 158
ktownsend 0:87a7fc231fae 159 /* Add the Battery Level service */
ktownsend 0:87a7fc231fae 160 battService.addCharacteristic(battLevel);
ktownsend 0:87a7fc231fae 161 nrf.getGattServer().addService(battService);
ktownsend 0:87a7fc231fae 162
ktownsend 0:87a7fc231fae 163 /* Add the Device Information service */
ktownsend 0:87a7fc231fae 164 deviceInformationService.addCharacteristic(deviceManufacturer);
ktownsend 0:87a7fc231fae 165 nrf.getGattServer().addService(deviceInformationService);
Rohit Grover 3:24e2b056d229 166
ktownsend 0:87a7fc231fae 167 /* Add the Heart Rate service */
ktownsend 0:87a7fc231fae 168 hrmService.addCharacteristic(hrmRate);
ktownsend 0:87a7fc231fae 169 hrmService.addCharacteristic(hrmLocation);
ktownsend 0:87a7fc231fae 170 nrf.getGattServer().addService(hrmService);
Rohit Grover 3:24e2b056d229 171
ktownsend 0:87a7fc231fae 172 /* Start advertising (make sure you've added all your data first) */
ktownsend 0:87a7fc231fae 173 nrf.getGap().startAdvertising(advParams);
Rohit Grover 3:24e2b056d229 174
Rohit Grover 3:24e2b056d229 175 /* Wait until we are connected to a central device before updating
Rohit Grover 3:24e2b056d229 176 * anything */
ktownsend 0:87a7fc231fae 177 pc.printf("Waiting for a connection ...");
Rohit Grover 3:24e2b056d229 178 while (!nrf.getGap().state.connected) {
ktownsend 0:87a7fc231fae 179 }
ktownsend 0:87a7fc231fae 180 pc.printf("Connected!\n\r");
Rohit Grover 3:24e2b056d229 181
ktownsend 0:87a7fc231fae 182 /* Now that we're live, update the battery level characteristic, and */
ktownsend 0:87a7fc231fae 183 /* change the device manufacturer characteristic to 'mbed' */
Rohit Grover 5:b0baff4a124f 184 nrf.getGattServer().updateValue(battLevel.getHandle(), (uint8_t *)&batt,
Rohit Grover 3:24e2b056d229 185 sizeof(batt));
Rohit Grover 5:b0baff4a124f 186 nrf.getGattServer().updateValue(deviceManufacturer.getHandle(),
Rohit Grover 3:24e2b056d229 187 deviceName,
Rohit Grover 3:24e2b056d229 188 sizeof(deviceName));
ktownsend 0:87a7fc231fae 189
ktownsend 0:87a7fc231fae 190 /* Set the heart rate monitor location (one time only) */
ktownsend 0:87a7fc231fae 191 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
ktownsend 0:87a7fc231fae 192 uint8_t location = 0x03; /* Finger */
ktownsend 0:87a7fc231fae 193 uint8_t hrmCounter = 100;
Rohit Grover 5:b0baff4a124f 194 nrf.getGattServer().updateValue(hrmLocation.getHandle(),
Rohit Grover 3:24e2b056d229 195 (uint8_t *)&location,
Rohit Grover 3:24e2b056d229 196 sizeof(location));
ktownsend 0:87a7fc231fae 197
ktownsend 0:87a7fc231fae 198 /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 3:24e2b056d229 199 for (;; ) {
Rohit Grover 3:24e2b056d229 200 led1 = !led1;
Rohit Grover 3:24e2b056d229 201 wait(1);
Rohit Grover 3:24e2b056d229 202
Rohit Grover 3:24e2b056d229 203 /* Update battery level */
Rohit Grover 3:24e2b056d229 204 batt++;
Rohit Grover 3:24e2b056d229 205 if (batt > 100) {
Rohit Grover 3:24e2b056d229 206 batt = 72;
Rohit Grover 3:24e2b056d229 207 }
Rohit Grover 5:b0baff4a124f 208 nrf.getGattServer().updateValue(battLevel.getHandle(),
Rohit Grover 3:24e2b056d229 209 (uint8_t *)&batt,
Rohit Grover 3:24e2b056d229 210 sizeof(batt));
ktownsend 0:87a7fc231fae 211
ktownsend 0:87a7fc231fae 212 /* Update the HRM measurement */
ktownsend 0:87a7fc231fae 213 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
ktownsend 0:87a7fc231fae 214 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 3:24e2b056d229 215 hrmCounter++;
Rohit Grover 3:24e2b056d229 216 if (hrmCounter == 175) {
Rohit Grover 3:24e2b056d229 217 hrmCounter = 100;
Rohit Grover 3:24e2b056d229 218 }
Rohit Grover 3:24e2b056d229 219 uint8_t bpm[2] = {0x00, hrmCounter};
Rohit Grover 5:b0baff4a124f 220 nrf.getGattServer().updateValue(hrmRate.getHandle(), bpm, sizeof(bpm));
ktownsend 0:87a7fc231fae 221 }
ktownsend 0:87a7fc231fae 222 }
ktownsend 0:87a7fc231fae 223
ktownsend 0:87a7fc231fae 224 /**************************************************************************/
ktownsend 0:87a7fc231fae 225 /*!
ktownsend 0:87a7fc231fae 226 @brief Ticker callback to switch led2 state
ktownsend 0:87a7fc231fae 227 */
ktownsend 0:87a7fc231fae 228 /**************************************************************************/
ktownsend 0:87a7fc231fae 229 void tickerCallback(void)
ktownsend 0:87a7fc231fae 230 {
ktownsend 0:87a7fc231fae 231 led2 = !led2;
ktownsend 0:87a7fc231fae 232 }