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@16:f3361e20642d, 2014-06-11 (annotated)

Committer:
Rohit Grover
Date:
Wed Jun 11 09:06:14 2014 +0100
Revision:
16:f3361e20642d
Parent:
15:7ba28817e31e
Child:
17:583b765af55f
minor white-space diffs having to do with coding style

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"
Rohit Grover 10:2436164b692e 18 #include "BLEDevice.h"
ktownsend 0:87a7fc231fae 19
Rohit Grover 10:2436164b692e 20 BLEDevice ble;
ktownsend 0:87a7fc231fae 21
Rohit Grover 3:24e2b056d229 22 DigitalOut led1(LED1);
Rohit Grover 9:5d693381e883 23
Rohit Grover 9:5d693381e883 24 #define NEED_CONSOLE_OUTPUT 0 /* Set this if you need debug messages on the console;
Rohit Grover 9:5d693381e883 25 * it will have an impact on code-size and power
Rohit Grover 9:5d693381e883 26 * consumption. */
Rohit Grover 9:5d693381e883 27
Rohit Grover 9:5d693381e883 28 #if NEED_CONSOLE_OUTPUT
Rohit Grover 9:5d693381e883 29 Serial pc(USBTX, USBRX);
Rohit Grover 9:5d693381e883 30 #define DEBUG(...) { pc.printf(__VA_ARGS__); }
Rohit Grover 9:5d693381e883 31 #else
Rohit Grover 9:5d693381e883 32 #define DEBUG(...) /* nothing */
Rohit Grover 9:5d693381e883 33 #endif /* #if NEED_CONSOLE_OUTPUT */
ktownsend 0:87a7fc231fae 34
ktownsend 0:87a7fc231fae 35 /* Battery Level Service */
Rohit Grover 3:24e2b056d229 36 uint8_t batt = 72; /* Battery level */
rgrover1 7:daab8ba5139e 37 uint8_t read_batt = 0; /* Variable to hold battery level reads */
Rohit Grover 3:24e2b056d229 38 GattService battService (GattService::UUID_BATTERY_SERVICE);
Rohit Grover 16:f3361e20642d 39 GattCharacteristic battLevel (GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, 1, 1,
rgrover1 7:daab8ba5139e 40 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 41
ktownsend 0:87a7fc231fae 42 /* Heart Rate Service */
ktownsend 0:87a7fc231fae 43 /* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
ktownsend 0:87a7fc231fae 44 /* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
ktownsend 0:87a7fc231fae 45 /* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 16:f3361e20642d 46 GattService hrmService(GattService::UUID_HEART_RATE_SERVICE);
Rohit Grover 16:f3361e20642d 47 GattCharacteristic hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, 2, 3, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
Rohit Grover 16:f3361e20642d 48 GattCharacteristic hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, 1, 1, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 49
ktownsend 0:87a7fc231fae 50 /* Device Information service */
Rohit Grover 8:49d8ee0aac11 51 static const uint8_t deviceName[] = {'m', 'b', 'e', 'd'};
rgrover1 7:daab8ba5139e 52 GattService deviceInformationService (GattService::UUID_DEVICE_INFORMATION_SERVICE);
Rohit Grover 16:f3361e20642d 53 GattCharacteristic deviceManufacturer (GattCharacteristic::UUID_MANUFACTURER_NAME_STRING_CHAR,
Rohit Grover 16:f3361e20642d 54 sizeof(deviceName), sizeof(deviceName), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 55
rgrover1 7:daab8ba5139e 56 static const uint16_t uuid16_list[] = {
rgrover1 7:daab8ba5139e 57 GattService::UUID_BATTERY_SERVICE,
rgrover1 7:daab8ba5139e 58 GattService::UUID_DEVICE_INFORMATION_SERVICE,
rgrover1 7:daab8ba5139e 59 GattService::UUID_HEART_RATE_SERVICE
rgrover1 7:daab8ba5139e 60 };
ktownsend 0:87a7fc231fae 61
rgrover1 7:daab8ba5139e 62 void timeoutCallback(void)
ktownsend 0:87a7fc231fae 63 {
Rohit Grover 9:5d693381e883 64 DEBUG("Advertising Timeout!\n\r");
rgrover1 7:daab8ba5139e 65 // Restart the advertising process with a much slower interval,
rgrover1 7:daab8ba5139e 66 // only start advertising again after a button press, etc.
rgrover1 7:daab8ba5139e 67 }
ktownsend 0:87a7fc231fae 68
rgrover1 7:daab8ba5139e 69 void connectionCallback(void)
rgrover1 7:daab8ba5139e 70 {
Rohit Grover 9:5d693381e883 71 DEBUG("Connected!\n\r");
rgrover1 7:daab8ba5139e 72 }
ktownsend 0:87a7fc231fae 73
rgrover1 7:daab8ba5139e 74 void disconnectionCallback(void)
ktownsend 0:87a7fc231fae 75 {
Rohit Grover 9:5d693381e883 76 DEBUG("Disconnected!\n\r");
Rohit Grover 9:5d693381e883 77 DEBUG("Restarting the advertising process\n\r");
rgrover1 7:daab8ba5139e 78 ble.startAdvertising();
rgrover1 7:daab8ba5139e 79 }
Rohit Grover 3:24e2b056d229 80
rgrover1 7:daab8ba5139e 81 void updatesEnabledCallback(uint16_t charHandle)
rgrover1 7:daab8ba5139e 82 {
rgrover1 7:daab8ba5139e 83 if (charHandle == hrmRate.getHandle()) {
Rohit Grover 9:5d693381e883 84 DEBUG("Heart rate notify enabled\n\r");
ktownsend 0:87a7fc231fae 85 }
rgrover1 7:daab8ba5139e 86 }
ktownsend 0:87a7fc231fae 87
rgrover1 7:daab8ba5139e 88 void updatesDisabledCallback(uint16_t charHandle)
rgrover1 7:daab8ba5139e 89 {
rgrover1 7:daab8ba5139e 90 if (charHandle == hrmRate.getHandle()) {
Rohit Grover 9:5d693381e883 91 DEBUG("Heart rate notify disabled\n\r");
ktownsend 0:87a7fc231fae 92 }
rgrover1 7:daab8ba5139e 93 }
ktownsend 0:87a7fc231fae 94
Rohit Grover 13:3ca2045597e7 95 /**
Rohit Grover 13:3ca2045597e7 96 * Runs once a second in interrupt context triggered by the 'ticker'; updates
Rohit Grover 13:3ca2045597e7 97 * battery level and hrmCounter if there is a connection.
Rohit Grover 13:3ca2045597e7 98 */
Rohit Grover 11:1d9aafee4984 99 void periodicCallback(void)
Rohit Grover 11:1d9aafee4984 100 {
Rohit Grover 11:1d9aafee4984 101 led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 11:1d9aafee4984 102
Rohit Grover 11:1d9aafee4984 103 if (ble.getGapState().connected) {
Rohit Grover 11:1d9aafee4984 104 /* Update battery level */
Rohit Grover 11:1d9aafee4984 105 batt++;
Rohit Grover 11:1d9aafee4984 106 if (batt > 100) {
Rohit Grover 11:1d9aafee4984 107 batt = 72;
Rohit Grover 11:1d9aafee4984 108 }
Rohit Grover 11:1d9aafee4984 109 ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
Rohit Grover 11:1d9aafee4984 110
Rohit Grover 11:1d9aafee4984 111 /* Update the HRM measurement */
Rohit Grover 11:1d9aafee4984 112 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
Rohit Grover 11:1d9aafee4984 113 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 11:1d9aafee4984 114 static uint8_t hrmCounter = 100;
Rohit Grover 11:1d9aafee4984 115 hrmCounter++;
Rohit Grover 11:1d9aafee4984 116 if (hrmCounter == 175) {
Rohit Grover 11:1d9aafee4984 117 hrmCounter = 100;
Rohit Grover 11:1d9aafee4984 118 }
Rohit Grover 11:1d9aafee4984 119 uint8_t bpm[2] = {0x00, hrmCounter};
Rohit Grover 11:1d9aafee4984 120 ble.updateCharacteristicValue(hrmRate.getHandle(), bpm, sizeof(bpm));
Rohit Grover 11:1d9aafee4984 121 }
Rohit Grover 11:1d9aafee4984 122 }
Rohit Grover 11:1d9aafee4984 123
ktownsend 0:87a7fc231fae 124 int main(void)
ktownsend 0:87a7fc231fae 125 {
Rohit Grover 3:24e2b056d229 126 led1 = 1;
Rohit Grover 11:1d9aafee4984 127 Ticker ticker;
Rohit Grover 11:1d9aafee4984 128 ticker.attach(periodicCallback, 1);
ktownsend 0:87a7fc231fae 129
Rohit Grover 15:7ba28817e31e 130 DEBUG("Initialising the nRF51822\n\r");
Rohit Grover 15:7ba28817e31e 131 ble.init();
Rohit Grover 15:7ba28817e31e 132
ktownsend 0:87a7fc231fae 133 /* Setup the local GAP/GATT event handlers */
rgrover1 7:daab8ba5139e 134 ble.onTimeout(timeoutCallback);
rgrover1 7:daab8ba5139e 135 ble.onConnection(connectionCallback);
rgrover1 7:daab8ba5139e 136 ble.onDisconnection(disconnectionCallback);
rgrover1 7:daab8ba5139e 137 ble.onUpdatesEnabled(updatesEnabledCallback);
rgrover1 7:daab8ba5139e 138 ble.onUpdatesDisabled(updatesDisabledCallback);
ktownsend 0:87a7fc231fae 139
Rohit Grover 15:7ba28817e31e 140 /* setup advertising */
rgrover1 7:daab8ba5139e 141 ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
rgrover1 7:daab8ba5139e 142 ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
rgrover1 7:daab8ba5139e 143 ble.accumulateAdvertisingPayload(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
rgrover1 7:daab8ba5139e 144 ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
rgrover1 7:daab8ba5139e 145 ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
rgrover1 7:daab8ba5139e 146 ble.startAdvertising();
Rohit Grover 3:24e2b056d229 147
Rohit Grover 11:1d9aafee4984 148 /* Add the Device Information service */
Rohit Grover 11:1d9aafee4984 149 deviceInformationService.addCharacteristic(deviceManufacturer);
Rohit Grover 11:1d9aafee4984 150 ble.addService(deviceInformationService);
rgrover1 7:daab8ba5139e 151 ble.updateCharacteristicValue(deviceManufacturer.getHandle(), deviceName, sizeof(deviceName));
ktownsend 0:87a7fc231fae 152
Rohit Grover 11:1d9aafee4984 153 /* Add the Battery Level service */
Rohit Grover 11:1d9aafee4984 154 battService.addCharacteristic(battLevel);
Rohit Grover 11:1d9aafee4984 155 ble.addService(battService);
Rohit Grover 11:1d9aafee4984 156 ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
Rohit Grover 11:1d9aafee4984 157
Rohit Grover 11:1d9aafee4984 158 /* Add the Heart Rate service */
Rohit Grover 11:1d9aafee4984 159 hrmService.addCharacteristic(hrmRate);
Rohit Grover 11:1d9aafee4984 160 hrmService.addCharacteristic(hrmLocation);
Rohit Grover 11:1d9aafee4984 161 ble.addService(hrmService);
ktownsend 0:87a7fc231fae 162 /* Set the heart rate monitor location (one time only) */
ktownsend 0:87a7fc231fae 163 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 11:1d9aafee4984 164 uint8_t location = 0x03; /* Finger */
rgrover1 7:daab8ba5139e 165 ble.updateCharacteristicValue(hrmLocation.getHandle(), (uint8_t *)&location, sizeof(location));
ktownsend 0:87a7fc231fae 166
Rohit Grover 11:1d9aafee4984 167 while (true) {
Rohit Grover 11:1d9aafee4984 168 ble.waitForEvent();
ktownsend 0:87a7fc231fae 169 }
ktownsend 0:87a7fc231fae 170 }