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@18:8a2e313f49cb, 2014-06-11 (annotated)

Committer:
Rohit Grover
Date:
Wed Jun 11 14:02:16 2014 +0100
Revision:
18:8a2e313f49cb
Parent:
17:583b765af55f
Child:
19:1713b11694ea
GattServer::addService() automatically sets initial value 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"
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 */
Rohit Grover 18:8a2e313f49cb 37 GattCharacteristic battLevel (GattCharacteristic::UUID_BATTERY_LEVEL_CHAR, &batt, sizeof(batt), sizeof(batt),
Rohit Grover 18:8a2e313f49cb 38 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
Rohit Grover 3:24e2b056d229 39 GattService battService (GattService::UUID_BATTERY_SERVICE);
ktownsend 0:87a7fc231fae 40
ktownsend 0:87a7fc231fae 41 /* Heart Rate Service */
ktownsend 0:87a7fc231fae 42 /* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
ktownsend 0:87a7fc231fae 43 /* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
ktownsend 0:87a7fc231fae 44 /* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 18:8a2e313f49cb 45 static uint8_t hrmCounter = 100;
Rohit Grover 18:8a2e313f49cb 46 static uint8_t bpm[2] = {0x00, hrmCounter};
Rohit Grover 18:8a2e313f49cb 47 GattCharacteristic hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, bpm, sizeof(bpm), sizeof(bpm), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
Rohit Grover 18:8a2e313f49cb 48 static const uint8_t location = 0x03; /* Finger */
Rohit Grover 18:8a2e313f49cb 49 GattCharacteristic hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR,
Rohit Grover 18:8a2e313f49cb 50 (uint8_t *)&location, sizeof(location), sizeof(location),
Rohit Grover 18:8a2e313f49cb 51 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
Rohit Grover 16:f3361e20642d 52 GattService hrmService(GattService::UUID_HEART_RATE_SERVICE);
ktownsend 0:87a7fc231fae 53
ktownsend 0:87a7fc231fae 54 /* Device Information service */
Rohit Grover 8:49d8ee0aac11 55 static const uint8_t deviceName[] = {'m', 'b', 'e', 'd'};
Rohit Grover 18:8a2e313f49cb 56 GattCharacteristic deviceManufacturer (GattCharacteristic::UUID_MANUFACTURER_NAME_STRING_CHAR,
Rohit Grover 18:8a2e313f49cb 57 (uint8_t *)deviceName, sizeof(deviceName), sizeof(deviceName),
Rohit Grover 18:8a2e313f49cb 58 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
rgrover1 7:daab8ba5139e 59 GattService deviceInformationService (GattService::UUID_DEVICE_INFORMATION_SERVICE);
ktownsend 0:87a7fc231fae 60
rgrover1 7:daab8ba5139e 61 static const uint16_t uuid16_list[] = {
rgrover1 7:daab8ba5139e 62 GattService::UUID_BATTERY_SERVICE,
rgrover1 7:daab8ba5139e 63 GattService::UUID_DEVICE_INFORMATION_SERVICE,
rgrover1 7:daab8ba5139e 64 GattService::UUID_HEART_RATE_SERVICE
rgrover1 7:daab8ba5139e 65 };
ktownsend 0:87a7fc231fae 66
rgrover1 7:daab8ba5139e 67 void timeoutCallback(void)
ktownsend 0:87a7fc231fae 68 {
Rohit Grover 9:5d693381e883 69 DEBUG("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 {
Rohit Grover 9:5d693381e883 76 DEBUG("Connected!\n\r");
rgrover1 7:daab8ba5139e 77 }
ktownsend 0:87a7fc231fae 78
rgrover1 7:daab8ba5139e 79 void disconnectionCallback(void)
ktownsend 0:87a7fc231fae 80 {
Rohit Grover 9:5d693381e883 81 DEBUG("Disconnected!\n\r");
Rohit Grover 9:5d693381e883 82 DEBUG("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()) {
Rohit Grover 9:5d693381e883 89 DEBUG("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()) {
Rohit Grover 9:5d693381e883 96 DEBUG("Heart rate notify disabled\n\r");
ktownsend 0:87a7fc231fae 97 }
rgrover1 7:daab8ba5139e 98 }
ktownsend 0:87a7fc231fae 99
Rohit Grover 13:3ca2045597e7 100 /**
Rohit Grover 13:3ca2045597e7 101 * Runs once a second in interrupt context triggered by the 'ticker'; updates
Rohit Grover 13:3ca2045597e7 102 * battery level and hrmCounter if there is a connection.
Rohit Grover 13:3ca2045597e7 103 */
Rohit Grover 11:1d9aafee4984 104 void periodicCallback(void)
Rohit Grover 11:1d9aafee4984 105 {
Rohit Grover 11:1d9aafee4984 106 led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 11:1d9aafee4984 107
Rohit Grover 11:1d9aafee4984 108 if (ble.getGapState().connected) {
Rohit Grover 11:1d9aafee4984 109 /* Update battery level */
Rohit Grover 11:1d9aafee4984 110 batt++;
Rohit Grover 11:1d9aafee4984 111 if (batt > 100) {
Rohit Grover 11:1d9aafee4984 112 batt = 72;
Rohit Grover 11:1d9aafee4984 113 }
Rohit Grover 11:1d9aafee4984 114 ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
Rohit Grover 11:1d9aafee4984 115
Rohit Grover 11:1d9aafee4984 116 /* Update the HRM measurement */
Rohit Grover 11:1d9aafee4984 117 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
Rohit Grover 11:1d9aafee4984 118 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 11:1d9aafee4984 119 hrmCounter++;
Rohit Grover 11:1d9aafee4984 120 if (hrmCounter == 175) {
Rohit Grover 11:1d9aafee4984 121 hrmCounter = 100;
Rohit Grover 11:1d9aafee4984 122 }
Rohit Grover 18:8a2e313f49cb 123 bpm[1] = hrmCounter;
Rohit Grover 11:1d9aafee4984 124 ble.updateCharacteristicValue(hrmRate.getHandle(), bpm, sizeof(bpm));
Rohit Grover 11:1d9aafee4984 125 }
Rohit Grover 11:1d9aafee4984 126 }
Rohit Grover 11:1d9aafee4984 127
ktownsend 0:87a7fc231fae 128 int main(void)
ktownsend 0:87a7fc231fae 129 {
Rohit Grover 3:24e2b056d229 130 led1 = 1;
Rohit Grover 11:1d9aafee4984 131 Ticker ticker;
Rohit Grover 11:1d9aafee4984 132 ticker.attach(periodicCallback, 1);
ktownsend 0:87a7fc231fae 133
Rohit Grover 15:7ba28817e31e 134 DEBUG("Initialising the nRF51822\n\r");
Rohit Grover 15:7ba28817e31e 135 ble.init();
Rohit Grover 15:7ba28817e31e 136
ktownsend 0:87a7fc231fae 137 /* Setup the local GAP/GATT event handlers */
rgrover1 7:daab8ba5139e 138 ble.onTimeout(timeoutCallback);
rgrover1 7:daab8ba5139e 139 ble.onConnection(connectionCallback);
rgrover1 7:daab8ba5139e 140 ble.onDisconnection(disconnectionCallback);
rgrover1 7:daab8ba5139e 141 ble.onUpdatesEnabled(updatesEnabledCallback);
rgrover1 7:daab8ba5139e 142 ble.onUpdatesDisabled(updatesDisabledCallback);
ktownsend 0:87a7fc231fae 143
Rohit Grover 15:7ba28817e31e 144 /* setup advertising */
rgrover1 7:daab8ba5139e 145 ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
rgrover1 7:daab8ba5139e 146 ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
rgrover1 7:daab8ba5139e 147 ble.accumulateAdvertisingPayload(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
rgrover1 7:daab8ba5139e 148 ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
rgrover1 7:daab8ba5139e 149 ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
rgrover1 7:daab8ba5139e 150 ble.startAdvertising();
Rohit Grover 3:24e2b056d229 151
Rohit Grover 11:1d9aafee4984 152 /* Add the Device Information service */
Rohit Grover 11:1d9aafee4984 153 deviceInformationService.addCharacteristic(deviceManufacturer);
Rohit Grover 11:1d9aafee4984 154 ble.addService(deviceInformationService);
ktownsend 0:87a7fc231fae 155
Rohit Grover 11:1d9aafee4984 156 /* Add the Battery Level service */
Rohit Grover 11:1d9aafee4984 157 battService.addCharacteristic(battLevel);
Rohit Grover 11:1d9aafee4984 158 ble.addService(battService);
Rohit Grover 11:1d9aafee4984 159
Rohit Grover 11:1d9aafee4984 160 /* Add the Heart Rate service */
Rohit Grover 11:1d9aafee4984 161 hrmService.addCharacteristic(hrmRate);
Rohit Grover 11:1d9aafee4984 162 hrmService.addCharacteristic(hrmLocation);
Rohit Grover 11:1d9aafee4984 163 ble.addService(hrmService);
ktownsend 0:87a7fc231fae 164
Rohit Grover 11:1d9aafee4984 165 while (true) {
Rohit Grover 11:1d9aafee4984 166 ble.waitForEvent();
ktownsend 0:87a7fc231fae 167 }
ktownsend 0:87a7fc231fae 168 }