Jie Li / Mbed 2 deprecated BLE_HeartRate

Heart Rate Monitor example for the BLE API using nRF51822 native mode drivers

Dependencies:   BLE_API mbed nRF51822 X_NUCLEO_IDB0XA1

Fork of BLE_HeartRate by Bluetooth Low Energy

main.cpp@7:daab8ba5139e, 2014-06-10 (annotated)

Committer:
rgrover1
Date:
Tue Jun 10 09:21:43 2014 +0000
Revision:
7:daab8ba5139e
Parent:
5:b0baff4a124f
Child:
8:49d8ee0aac11
Update to using the latest versions of the underlying APIs and waitForEvent() to reduce power consumption.

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"
rgrover1 7:daab8ba5139e 18 #include "BLEPeripheral.h"
ktownsend 0:87a7fc231fae 19
rgrover1 7:daab8ba5139e 20 BLEPeripheral ble; /* 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 */
rgrover1 7:daab8ba5139e 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,
rgrover1 7:daab8ba5139e 32 1, /* initialLen */
rgrover1 7:daab8ba5139e 33 1, /* maxLen */
rgrover1 7:daab8ba5139e 34 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 35
ktownsend 0:87a7fc231fae 36 /* Heart Rate Service */
ktownsend 0:87a7fc231fae 37 /* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
ktownsend 0:87a7fc231fae 38 /* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
ktownsend 0:87a7fc231fae 39 /* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 3:24e2b056d229 40 GattService hrmService (GattService::UUID_HEART_RATE_SERVICE);
rgrover1 7:daab8ba5139e 41 GattCharacteristic hrmRate (GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR,
rgrover1 7:daab8ba5139e 42 2, /* initialLen */
rgrover1 7:daab8ba5139e 43 3, /* maxLen */
rgrover1 7:daab8ba5139e 44 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
rgrover1 7:daab8ba5139e 45 GattCharacteristic hrmLocation (GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR,
rgrover1 7:daab8ba5139e 46 1, /* initialLen */
rgrover1 7:daab8ba5139e 47 1, /* maxLen */
rgrover1 7:daab8ba5139e 48 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 49
ktownsend 0:87a7fc231fae 50 /* Device Information service */
Rohit Grover 3:24e2b056d229 51 uint8_t deviceName[4] = {'m', 'b', 'e', 'd'};
rgrover1 7:daab8ba5139e 52 GattService deviceInformationService (GattService::UUID_DEVICE_INFORMATION_SERVICE);
Rohit Grover 3:24e2b056d229 53 GattCharacteristic deviceManufacturer (
Rohit Grover 3:24e2b056d229 54 GattCharacteristic::UUID_MANUFACTURER_NAME_STRING_CHAR,
rgrover1 7:daab8ba5139e 55 sizeof(deviceName), /* initialLen */
rgrover1 7:daab8ba5139e 56 sizeof(deviceName), /* maxLen */
Rohit Grover 3:24e2b056d229 57 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 58
rgrover1 7:daab8ba5139e 59 static const uint16_t uuid16_list[] = {
rgrover1 7:daab8ba5139e 60 GattService::UUID_BATTERY_SERVICE,
rgrover1 7:daab8ba5139e 61 GattService::UUID_DEVICE_INFORMATION_SERVICE,
rgrover1 7:daab8ba5139e 62 GattService::UUID_HEART_RATE_SERVICE
rgrover1 7:daab8ba5139e 63 };
ktownsend 0:87a7fc231fae 64
ktownsend 0:87a7fc231fae 65 void tickerCallback(void);
ktownsend 0:87a7fc231fae 66
rgrover1 7:daab8ba5139e 67 void timeoutCallback(void)
ktownsend 0:87a7fc231fae 68 {
rgrover1 7:daab8ba5139e 69 pc.printf("Advertising Timeout!\n\r");
rgrover1 7:daab8ba5139e 70 // Restart the advertising process with a much slower interval,
rgrover1 7:daab8ba5139e 71 // only start advertising again after a button press, etc.
rgrover1 7:daab8ba5139e 72 }
ktownsend 0:87a7fc231fae 73
rgrover1 7:daab8ba5139e 74 void connectionCallback(void)
rgrover1 7:daab8ba5139e 75 {
rgrover1 7:daab8ba5139e 76 pc.printf("Connected!\n\r");
rgrover1 7:daab8ba5139e 77 }
ktownsend 0:87a7fc231fae 78
rgrover1 7:daab8ba5139e 79 void disconnectionCallback(void)
ktownsend 0:87a7fc231fae 80 {
rgrover1 7:daab8ba5139e 81 pc.printf("Disconnected!\n\r");
rgrover1 7:daab8ba5139e 82 pc.printf("Restarting the advertising process\n\r");
rgrover1 7:daab8ba5139e 83 ble.startAdvertising();
rgrover1 7:daab8ba5139e 84 }
Rohit Grover 3:24e2b056d229 85
rgrover1 7:daab8ba5139e 86 void updatesEnabledCallback(uint16_t charHandle)
rgrover1 7:daab8ba5139e 87 {
rgrover1 7:daab8ba5139e 88 if (charHandle == hrmRate.getHandle()) {
rgrover1 7:daab8ba5139e 89 pc.printf("Heart rate notify enabled\n\r");
ktownsend 0:87a7fc231fae 90 }
rgrover1 7:daab8ba5139e 91 }
ktownsend 0:87a7fc231fae 92
rgrover1 7:daab8ba5139e 93 void updatesDisabledCallback(uint16_t charHandle)
rgrover1 7:daab8ba5139e 94 {
rgrover1 7:daab8ba5139e 95 if (charHandle == hrmRate.getHandle()) {
rgrover1 7:daab8ba5139e 96 pc.printf("Heart rate notify disabled\n\r");
ktownsend 0:87a7fc231fae 97 }
rgrover1 7:daab8ba5139e 98 }
ktownsend 0:87a7fc231fae 99
ktownsend 0:87a7fc231fae 100 /**************************************************************************/
ktownsend 0:87a7fc231fae 101 /*!
ktownsend 0:87a7fc231fae 102 @brief Program entry point
ktownsend 0:87a7fc231fae 103 */
ktownsend 0:87a7fc231fae 104 /**************************************************************************/
ktownsend 0:87a7fc231fae 105 int main(void)
ktownsend 0:87a7fc231fae 106 {
ktownsend 0:87a7fc231fae 107 /* Setup blinky: led1 is toggled in main, led2 is toggled via Ticker */
Rohit Grover 3:24e2b056d229 108 led1 = 1;
Rohit Grover 3:24e2b056d229 109 led2 = 1;
ktownsend 0:87a7fc231fae 110 flipper.attach(&tickerCallback, 1.0);
ktownsend 0:87a7fc231fae 111
ktownsend 0:87a7fc231fae 112 /* Setup the local GAP/GATT event handlers */
rgrover1 7:daab8ba5139e 113 ble.onTimeout(timeoutCallback);
rgrover1 7:daab8ba5139e 114 ble.onConnection(connectionCallback);
rgrover1 7:daab8ba5139e 115 ble.onDisconnection(disconnectionCallback);
rgrover1 7:daab8ba5139e 116 ble.onUpdatesEnabled(updatesEnabledCallback);
rgrover1 7:daab8ba5139e 117 ble.onUpdatesDisabled(updatesDisabledCallback);
ktownsend 0:87a7fc231fae 118
ktownsend 0:87a7fc231fae 119 /* Initialise the nRF51822 */
ktownsend 0:87a7fc231fae 120 pc.printf("Initialising the nRF51822\n\r");
rgrover1 7:daab8ba5139e 121 ble.init();
ktownsend 0:87a7fc231fae 122
ktownsend 0:87a7fc231fae 123 /* Add BLE-Only flag and complete service list to the advertising data */
rgrover1 7:daab8ba5139e 124 ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
rgrover1 7:daab8ba5139e 125 ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
rgrover1 7:daab8ba5139e 126 ble.accumulateAdvertisingPayload(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
ktownsend 0:87a7fc231fae 127
ktownsend 0:87a7fc231fae 128 /* Add the Battery Level service */
ktownsend 0:87a7fc231fae 129 battService.addCharacteristic(battLevel);
rgrover1 7:daab8ba5139e 130 ble.addService(battService);
ktownsend 0:87a7fc231fae 131
ktownsend 0:87a7fc231fae 132 /* Add the Device Information service */
ktownsend 0:87a7fc231fae 133 deviceInformationService.addCharacteristic(deviceManufacturer);
rgrover1 7:daab8ba5139e 134 ble.addService(deviceInformationService);
Rohit Grover 3:24e2b056d229 135
ktownsend 0:87a7fc231fae 136 /* Add the Heart Rate service */
ktownsend 0:87a7fc231fae 137 hrmService.addCharacteristic(hrmRate);
ktownsend 0:87a7fc231fae 138 hrmService.addCharacteristic(hrmLocation);
rgrover1 7:daab8ba5139e 139 ble.addService(hrmService);
Rohit Grover 3:24e2b056d229 140
rgrover1 7:daab8ba5139e 141 ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
rgrover1 7:daab8ba5139e 142 ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
rgrover1 7:daab8ba5139e 143 ble.startAdvertising();
Rohit Grover 3:24e2b056d229 144
Rohit Grover 3:24e2b056d229 145 /* Wait until we are connected to a central device before updating
Rohit Grover 3:24e2b056d229 146 * anything */
ktownsend 0:87a7fc231fae 147 pc.printf("Waiting for a connection ...");
rgrover1 7:daab8ba5139e 148 while (!ble.getGapState().connected) {
rgrover1 7:daab8ba5139e 149 ble.waitForEvent();
ktownsend 0:87a7fc231fae 150 }
ktownsend 0:87a7fc231fae 151 pc.printf("Connected!\n\r");
Rohit Grover 3:24e2b056d229 152
rgrover1 7:daab8ba5139e 153 /* Now that we're live, update the battery level characteristic, and
rgrover1 7:daab8ba5139e 154 * change the device manufacturer characteristic to 'mbed' */
rgrover1 7:daab8ba5139e 155 ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
rgrover1 7:daab8ba5139e 156 ble.updateCharacteristicValue(deviceManufacturer.getHandle(), deviceName, sizeof(deviceName));
ktownsend 0:87a7fc231fae 157
ktownsend 0:87a7fc231fae 158 /* Set the heart rate monitor location (one time only) */
ktownsend 0:87a7fc231fae 159 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
rgrover1 7:daab8ba5139e 160 uint8_t location = 0x03; /* Finger */
ktownsend 0:87a7fc231fae 161 uint8_t hrmCounter = 100;
rgrover1 7:daab8ba5139e 162 ble.updateCharacteristicValue(hrmLocation.getHandle(), (uint8_t *)&location, sizeof(location));
ktownsend 0:87a7fc231fae 163
ktownsend 0:87a7fc231fae 164 /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 3:24e2b056d229 165 for (;; ) {
Rohit Grover 3:24e2b056d229 166 led1 = !led1;
Rohit Grover 3:24e2b056d229 167 wait(1);
Rohit Grover 3:24e2b056d229 168
Rohit Grover 3:24e2b056d229 169 /* Update battery level */
Rohit Grover 3:24e2b056d229 170 batt++;
Rohit Grover 3:24e2b056d229 171 if (batt > 100) {
Rohit Grover 3:24e2b056d229 172 batt = 72;
Rohit Grover 3:24e2b056d229 173 }
rgrover1 7:daab8ba5139e 174 ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
ktownsend 0:87a7fc231fae 175
rgrover1 7:daab8ba5139e 176 /* Update the HRM measurement */
rgrover1 7:daab8ba5139e 177 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
rgrover1 7:daab8ba5139e 178 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 3:24e2b056d229 179 hrmCounter++;
Rohit Grover 3:24e2b056d229 180 if (hrmCounter == 175) {
Rohit Grover 3:24e2b056d229 181 hrmCounter = 100;
Rohit Grover 3:24e2b056d229 182 }
Rohit Grover 3:24e2b056d229 183 uint8_t bpm[2] = {0x00, hrmCounter};
rgrover1 7:daab8ba5139e 184 ble.updateCharacteristicValue(hrmRate.getHandle(), bpm, sizeof(bpm));
ktownsend 0:87a7fc231fae 185 }
ktownsend 0:87a7fc231fae 186 }
ktownsend 0:87a7fc231fae 187
ktownsend 0:87a7fc231fae 188 /**************************************************************************/
ktownsend 0:87a7fc231fae 189 /*!
ktownsend 0:87a7fc231fae 190 @brief Ticker callback to switch led2 state
ktownsend 0:87a7fc231fae 191 */
ktownsend 0:87a7fc231fae 192 /**************************************************************************/
ktownsend 0:87a7fc231fae 193 void tickerCallback(void)
ktownsend 0:87a7fc231fae 194 {
ktownsend 0:87a7fc231fae 195 led2 = !led2;
ktownsend 0:87a7fc231fae 196 }