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@13:3ca2045597e7, 2014-06-10 (annotated)

Committer:
Rohit Grover
Date:
Tue Jun 10 14:36:25 2014 +0100
Revision:
13:3ca2045597e7
Parent:
11:1d9aafee4984
Child:
15:7ba28817e31e
minor updates to comment headers

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 3:24e2b056d229 39 GattCharacteristic battLevel (GattCharacteristic::UUID_BATTERY_LEVEL_CHAR,
rgrover1 7:daab8ba5139e 40 1, /* initialLen */
rgrover1 7:daab8ba5139e 41 1, /* maxLen */
rgrover1 7:daab8ba5139e 42 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 43
ktownsend 0:87a7fc231fae 44 /* Heart Rate Service */
ktownsend 0:87a7fc231fae 45 /* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
ktownsend 0:87a7fc231fae 46 /* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
ktownsend 0:87a7fc231fae 47 /* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 3:24e2b056d229 48 GattService hrmService (GattService::UUID_HEART_RATE_SERVICE);
rgrover1 7:daab8ba5139e 49 GattCharacteristic hrmRate (GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR,
rgrover1 7:daab8ba5139e 50 2, /* initialLen */
rgrover1 7:daab8ba5139e 51 3, /* maxLen */
rgrover1 7:daab8ba5139e 52 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
rgrover1 7:daab8ba5139e 53 GattCharacteristic hrmLocation (GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR,
rgrover1 7:daab8ba5139e 54 1, /* initialLen */
rgrover1 7:daab8ba5139e 55 1, /* maxLen */
rgrover1 7:daab8ba5139e 56 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 57
ktownsend 0:87a7fc231fae 58 /* Device Information service */
Rohit Grover 8:49d8ee0aac11 59 static const uint8_t deviceName[] = {'m', 'b', 'e', 'd'};
rgrover1 7:daab8ba5139e 60 GattService deviceInformationService (GattService::UUID_DEVICE_INFORMATION_SERVICE);
Rohit Grover 3:24e2b056d229 61 GattCharacteristic deviceManufacturer (
Rohit Grover 3:24e2b056d229 62 GattCharacteristic::UUID_MANUFACTURER_NAME_STRING_CHAR,
rgrover1 7:daab8ba5139e 63 sizeof(deviceName), /* initialLen */
rgrover1 7:daab8ba5139e 64 sizeof(deviceName), /* maxLen */
Rohit Grover 3:24e2b056d229 65 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
ktownsend 0:87a7fc231fae 66
rgrover1 7:daab8ba5139e 67 static const uint16_t uuid16_list[] = {
rgrover1 7:daab8ba5139e 68 GattService::UUID_BATTERY_SERVICE,
rgrover1 7:daab8ba5139e 69 GattService::UUID_DEVICE_INFORMATION_SERVICE,
rgrover1 7:daab8ba5139e 70 GattService::UUID_HEART_RATE_SERVICE
rgrover1 7:daab8ba5139e 71 };
ktownsend 0:87a7fc231fae 72
rgrover1 7:daab8ba5139e 73 void timeoutCallback(void)
ktownsend 0:87a7fc231fae 74 {
Rohit Grover 9:5d693381e883 75 DEBUG("Advertising Timeout!\n\r");
rgrover1 7:daab8ba5139e 76 // Restart the advertising process with a much slower interval,
rgrover1 7:daab8ba5139e 77 // only start advertising again after a button press, etc.
rgrover1 7:daab8ba5139e 78 }
ktownsend 0:87a7fc231fae 79
rgrover1 7:daab8ba5139e 80 void connectionCallback(void)
rgrover1 7:daab8ba5139e 81 {
Rohit Grover 9:5d693381e883 82 DEBUG("Connected!\n\r");
rgrover1 7:daab8ba5139e 83 }
ktownsend 0:87a7fc231fae 84
rgrover1 7:daab8ba5139e 85 void disconnectionCallback(void)
ktownsend 0:87a7fc231fae 86 {
Rohit Grover 9:5d693381e883 87 DEBUG("Disconnected!\n\r");
Rohit Grover 9:5d693381e883 88 DEBUG("Restarting the advertising process\n\r");
rgrover1 7:daab8ba5139e 89 ble.startAdvertising();
rgrover1 7:daab8ba5139e 90 }
Rohit Grover 3:24e2b056d229 91
rgrover1 7:daab8ba5139e 92 void updatesEnabledCallback(uint16_t charHandle)
rgrover1 7:daab8ba5139e 93 {
rgrover1 7:daab8ba5139e 94 if (charHandle == hrmRate.getHandle()) {
Rohit Grover 9:5d693381e883 95 DEBUG("Heart rate notify enabled\n\r");
ktownsend 0:87a7fc231fae 96 }
rgrover1 7:daab8ba5139e 97 }
ktownsend 0:87a7fc231fae 98
rgrover1 7:daab8ba5139e 99 void updatesDisabledCallback(uint16_t charHandle)
rgrover1 7:daab8ba5139e 100 {
rgrover1 7:daab8ba5139e 101 if (charHandle == hrmRate.getHandle()) {
Rohit Grover 9:5d693381e883 102 DEBUG("Heart rate notify disabled\n\r");
ktownsend 0:87a7fc231fae 103 }
rgrover1 7:daab8ba5139e 104 }
ktownsend 0:87a7fc231fae 105
Rohit Grover 13:3ca2045597e7 106 /**
Rohit Grover 13:3ca2045597e7 107 * Runs once a second in interrupt context triggered by the 'ticker'; updates
Rohit Grover 13:3ca2045597e7 108 * battery level and hrmCounter if there is a connection.
Rohit Grover 13:3ca2045597e7 109 */
Rohit Grover 11:1d9aafee4984 110 void periodicCallback(void)
Rohit Grover 11:1d9aafee4984 111 {
Rohit Grover 11:1d9aafee4984 112 led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 11:1d9aafee4984 113
Rohit Grover 11:1d9aafee4984 114 if (ble.getGapState().connected) {
Rohit Grover 11:1d9aafee4984 115 /* Update battery level */
Rohit Grover 11:1d9aafee4984 116 batt++;
Rohit Grover 11:1d9aafee4984 117 if (batt > 100) {
Rohit Grover 11:1d9aafee4984 118 batt = 72;
Rohit Grover 11:1d9aafee4984 119 }
Rohit Grover 11:1d9aafee4984 120 ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
Rohit Grover 11:1d9aafee4984 121
Rohit Grover 11:1d9aafee4984 122 /* Update the HRM measurement */
Rohit Grover 11:1d9aafee4984 123 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
Rohit Grover 11:1d9aafee4984 124 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 11:1d9aafee4984 125 static uint8_t hrmCounter = 100;
Rohit Grover 11:1d9aafee4984 126 hrmCounter++;
Rohit Grover 11:1d9aafee4984 127 if (hrmCounter == 175) {
Rohit Grover 11:1d9aafee4984 128 hrmCounter = 100;
Rohit Grover 11:1d9aafee4984 129 }
Rohit Grover 11:1d9aafee4984 130 uint8_t bpm[2] = {0x00, hrmCounter};
Rohit Grover 11:1d9aafee4984 131 ble.updateCharacteristicValue(hrmRate.getHandle(), bpm, sizeof(bpm));
Rohit Grover 11:1d9aafee4984 132 }
Rohit Grover 11:1d9aafee4984 133 }
Rohit Grover 11:1d9aafee4984 134
ktownsend 0:87a7fc231fae 135 int main(void)
ktownsend 0:87a7fc231fae 136 {
Rohit Grover 3:24e2b056d229 137 led1 = 1;
Rohit Grover 11:1d9aafee4984 138 Ticker ticker;
Rohit Grover 11:1d9aafee4984 139 ticker.attach(periodicCallback, 1);
ktownsend 0:87a7fc231fae 140
ktownsend 0:87a7fc231fae 141 /* Setup the local GAP/GATT event handlers */
rgrover1 7:daab8ba5139e 142 ble.onTimeout(timeoutCallback);
rgrover1 7:daab8ba5139e 143 ble.onConnection(connectionCallback);
rgrover1 7:daab8ba5139e 144 ble.onDisconnection(disconnectionCallback);
rgrover1 7:daab8ba5139e 145 ble.onUpdatesEnabled(updatesEnabledCallback);
rgrover1 7:daab8ba5139e 146 ble.onUpdatesDisabled(updatesDisabledCallback);
ktownsend 0:87a7fc231fae 147
Rohit Grover 9:5d693381e883 148 DEBUG("Initialising the nRF51822\n\r");
rgrover1 7:daab8ba5139e 149 ble.init();
ktownsend 0:87a7fc231fae 150
rgrover1 7:daab8ba5139e 151 ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
rgrover1 7:daab8ba5139e 152 ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
rgrover1 7:daab8ba5139e 153 ble.accumulateAdvertisingPayload(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
ktownsend 0:87a7fc231fae 154
rgrover1 7:daab8ba5139e 155 ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
rgrover1 7:daab8ba5139e 156 ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
rgrover1 7:daab8ba5139e 157 ble.startAdvertising();
Rohit Grover 3:24e2b056d229 158
Rohit Grover 11:1d9aafee4984 159 /* Add the Device Information service */
Rohit Grover 11:1d9aafee4984 160 deviceInformationService.addCharacteristic(deviceManufacturer);
Rohit Grover 11:1d9aafee4984 161 ble.addService(deviceInformationService);
rgrover1 7:daab8ba5139e 162 ble.updateCharacteristicValue(deviceManufacturer.getHandle(), deviceName, sizeof(deviceName));
ktownsend 0:87a7fc231fae 163
Rohit Grover 11:1d9aafee4984 164 /* Add the Battery Level service */
Rohit Grover 11:1d9aafee4984 165 battService.addCharacteristic(battLevel);
Rohit Grover 11:1d9aafee4984 166 ble.addService(battService);
Rohit Grover 11:1d9aafee4984 167 ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
Rohit Grover 11:1d9aafee4984 168
Rohit Grover 11:1d9aafee4984 169 /* Add the Heart Rate service */
Rohit Grover 11:1d9aafee4984 170 hrmService.addCharacteristic(hrmRate);
Rohit Grover 11:1d9aafee4984 171 hrmService.addCharacteristic(hrmLocation);
Rohit Grover 11:1d9aafee4984 172 ble.addService(hrmService);
ktownsend 0:87a7fc231fae 173 /* Set the heart rate monitor location (one time only) */
ktownsend 0:87a7fc231fae 174 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 11:1d9aafee4984 175 uint8_t location = 0x03; /* Finger */
rgrover1 7:daab8ba5139e 176 ble.updateCharacteristicValue(hrmLocation.getHandle(), (uint8_t *)&location, sizeof(location));
ktownsend 0:87a7fc231fae 177
Rohit Grover 11:1d9aafee4984 178 while (true) {
Rohit Grover 11:1d9aafee4984 179 ble.waitForEvent();
ktownsend 0:87a7fc231fae 180 }
ktownsend 0:87a7fc231fae 181 }