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@19:1713b11694ea, 2014-06-11 (annotated)

Committer:
Rohit Grover
Date:
Wed Jun 11 14:45:05 2014 +0100
Revision:
19:1713b11694ea
Parent:
18:8a2e313f49cb
Child:
20:58bff62d0f7a
make use of the new GattService constructor which takes in an array of pointers to 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 19:1713b11694ea 39 GattCharacteristic *battChars[] = {
Rohit Grover 19:1713b11694ea 40 &battLevel,
Rohit Grover 19:1713b11694ea 41 };
Rohit Grover 19:1713b11694ea 42 GattService battService (GattService::UUID_BATTERY_SERVICE, battChars, sizeof(battChars) / sizeof(GattCharacteristic *));
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 18:8a2e313f49cb 48 static uint8_t hrmCounter = 100;
Rohit Grover 18:8a2e313f49cb 49 static uint8_t bpm[2] = {0x00, hrmCounter};
Rohit Grover 18:8a2e313f49cb 50 GattCharacteristic hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, bpm, sizeof(bpm), sizeof(bpm), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
Rohit Grover 18:8a2e313f49cb 51 static const uint8_t location = 0x03; /* Finger */
Rohit Grover 18:8a2e313f49cb 52 GattCharacteristic hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR,
Rohit Grover 18:8a2e313f49cb 53 (uint8_t *)&location, sizeof(location), sizeof(location),
Rohit Grover 18:8a2e313f49cb 54 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
Rohit Grover 19:1713b11694ea 55 GattCharacteristic *hrmChars[] = {
Rohit Grover 19:1713b11694ea 56 &hrmRate, &hrmLocation,
Rohit Grover 19:1713b11694ea 57 };
Rohit Grover 19:1713b11694ea 58 GattService hrmService(GattService::UUID_HEART_RATE_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
ktownsend 0:87a7fc231fae 59
ktownsend 0:87a7fc231fae 60 /* Device Information service */
Rohit Grover 8:49d8ee0aac11 61 static const uint8_t deviceName[] = {'m', 'b', 'e', 'd'};
Rohit Grover 18:8a2e313f49cb 62 GattCharacteristic deviceManufacturer (GattCharacteristic::UUID_MANUFACTURER_NAME_STRING_CHAR,
Rohit Grover 18:8a2e313f49cb 63 (uint8_t *)deviceName, sizeof(deviceName), sizeof(deviceName),
Rohit Grover 18:8a2e313f49cb 64 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
Rohit Grover 19:1713b11694ea 65 GattCharacteristic *devInfoChars[] = {
Rohit Grover 19:1713b11694ea 66 &deviceManufacturer,
Rohit Grover 19:1713b11694ea 67 };
Rohit Grover 19:1713b11694ea 68 GattService deviceInformationService (GattService::UUID_DEVICE_INFORMATION_SERVICE,
Rohit Grover 19:1713b11694ea 69 devInfoChars, sizeof(devInfoChars) / sizeof(GattCharacteristic *));
ktownsend 0:87a7fc231fae 70
rgrover1 7:daab8ba5139e 71 static const uint16_t uuid16_list[] = {
rgrover1 7:daab8ba5139e 72 GattService::UUID_BATTERY_SERVICE,
rgrover1 7:daab8ba5139e 73 GattService::UUID_DEVICE_INFORMATION_SERVICE,
rgrover1 7:daab8ba5139e 74 GattService::UUID_HEART_RATE_SERVICE
rgrover1 7:daab8ba5139e 75 };
ktownsend 0:87a7fc231fae 76
rgrover1 7:daab8ba5139e 77 void timeoutCallback(void)
ktownsend 0:87a7fc231fae 78 {
Rohit Grover 9:5d693381e883 79 DEBUG("Advertising Timeout!\n\r");
rgrover1 7:daab8ba5139e 80 // Restart the advertising process with a much slower interval,
rgrover1 7:daab8ba5139e 81 // only start advertising again after a button press, etc.
rgrover1 7:daab8ba5139e 82 }
ktownsend 0:87a7fc231fae 83
rgrover1 7:daab8ba5139e 84 void connectionCallback(void)
rgrover1 7:daab8ba5139e 85 {
Rohit Grover 9:5d693381e883 86 DEBUG("Connected!\n\r");
rgrover1 7:daab8ba5139e 87 }
ktownsend 0:87a7fc231fae 88
rgrover1 7:daab8ba5139e 89 void disconnectionCallback(void)
ktownsend 0:87a7fc231fae 90 {
Rohit Grover 9:5d693381e883 91 DEBUG("Disconnected!\n\r");
Rohit Grover 9:5d693381e883 92 DEBUG("Restarting the advertising process\n\r");
rgrover1 7:daab8ba5139e 93 ble.startAdvertising();
rgrover1 7:daab8ba5139e 94 }
Rohit Grover 3:24e2b056d229 95
rgrover1 7:daab8ba5139e 96 void updatesEnabledCallback(uint16_t charHandle)
rgrover1 7:daab8ba5139e 97 {
rgrover1 7:daab8ba5139e 98 if (charHandle == hrmRate.getHandle()) {
Rohit Grover 9:5d693381e883 99 DEBUG("Heart rate notify enabled\n\r");
ktownsend 0:87a7fc231fae 100 }
rgrover1 7:daab8ba5139e 101 }
ktownsend 0:87a7fc231fae 102
rgrover1 7:daab8ba5139e 103 void updatesDisabledCallback(uint16_t charHandle)
rgrover1 7:daab8ba5139e 104 {
rgrover1 7:daab8ba5139e 105 if (charHandle == hrmRate.getHandle()) {
Rohit Grover 9:5d693381e883 106 DEBUG("Heart rate notify disabled\n\r");
ktownsend 0:87a7fc231fae 107 }
rgrover1 7:daab8ba5139e 108 }
ktownsend 0:87a7fc231fae 109
Rohit Grover 13:3ca2045597e7 110 /**
Rohit Grover 13:3ca2045597e7 111 * Runs once a second in interrupt context triggered by the 'ticker'; updates
Rohit Grover 13:3ca2045597e7 112 * battery level and hrmCounter if there is a connection.
Rohit Grover 13:3ca2045597e7 113 */
Rohit Grover 11:1d9aafee4984 114 void periodicCallback(void)
Rohit Grover 11:1d9aafee4984 115 {
Rohit Grover 11:1d9aafee4984 116 led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 11:1d9aafee4984 117
Rohit Grover 11:1d9aafee4984 118 if (ble.getGapState().connected) {
Rohit Grover 11:1d9aafee4984 119 /* Update battery level */
Rohit Grover 11:1d9aafee4984 120 batt++;
Rohit Grover 11:1d9aafee4984 121 if (batt > 100) {
Rohit Grover 11:1d9aafee4984 122 batt = 72;
Rohit Grover 11:1d9aafee4984 123 }
Rohit Grover 11:1d9aafee4984 124 ble.updateCharacteristicValue(battLevel.getHandle(), (uint8_t *)&batt, sizeof(batt));
Rohit Grover 11:1d9aafee4984 125
Rohit Grover 11:1d9aafee4984 126 /* Update the HRM measurement */
Rohit Grover 11:1d9aafee4984 127 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
Rohit Grover 11:1d9aafee4984 128 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 11:1d9aafee4984 129 hrmCounter++;
Rohit Grover 11:1d9aafee4984 130 if (hrmCounter == 175) {
Rohit Grover 11:1d9aafee4984 131 hrmCounter = 100;
Rohit Grover 11:1d9aafee4984 132 }
Rohit Grover 18:8a2e313f49cb 133 bpm[1] = hrmCounter;
Rohit Grover 11:1d9aafee4984 134 ble.updateCharacteristicValue(hrmRate.getHandle(), bpm, sizeof(bpm));
Rohit Grover 11:1d9aafee4984 135 }
Rohit Grover 11:1d9aafee4984 136 }
Rohit Grover 11:1d9aafee4984 137
ktownsend 0:87a7fc231fae 138 int main(void)
ktownsend 0:87a7fc231fae 139 {
Rohit Grover 3:24e2b056d229 140 led1 = 1;
Rohit Grover 11:1d9aafee4984 141 Ticker ticker;
Rohit Grover 11:1d9aafee4984 142 ticker.attach(periodicCallback, 1);
ktownsend 0:87a7fc231fae 143
Rohit Grover 15:7ba28817e31e 144 DEBUG("Initialising the nRF51822\n\r");
Rohit Grover 15:7ba28817e31e 145 ble.init();
Rohit Grover 15:7ba28817e31e 146
ktownsend 0:87a7fc231fae 147 /* Setup the local GAP/GATT event handlers */
rgrover1 7:daab8ba5139e 148 ble.onTimeout(timeoutCallback);
rgrover1 7:daab8ba5139e 149 ble.onConnection(connectionCallback);
rgrover1 7:daab8ba5139e 150 ble.onDisconnection(disconnectionCallback);
rgrover1 7:daab8ba5139e 151 ble.onUpdatesEnabled(updatesEnabledCallback);
rgrover1 7:daab8ba5139e 152 ble.onUpdatesDisabled(updatesDisabledCallback);
ktownsend 0:87a7fc231fae 153
Rohit Grover 15:7ba28817e31e 154 /* setup advertising */
rgrover1 7:daab8ba5139e 155 ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
rgrover1 7:daab8ba5139e 156 ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
rgrover1 7:daab8ba5139e 157 ble.accumulateAdvertisingPayload(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
rgrover1 7:daab8ba5139e 158 ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
rgrover1 7:daab8ba5139e 159 ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
rgrover1 7:daab8ba5139e 160 ble.startAdvertising();
Rohit Grover 3:24e2b056d229 161
Rohit Grover 11:1d9aafee4984 162 ble.addService(deviceInformationService);
Rohit Grover 11:1d9aafee4984 163 ble.addService(battService);
Rohit Grover 11:1d9aafee4984 164 ble.addService(hrmService);
ktownsend 0:87a7fc231fae 165
Rohit Grover 11:1d9aafee4984 166 while (true) {
Rohit Grover 11:1d9aafee4984 167 ble.waitForEvent();
ktownsend 0:87a7fc231fae 168 }
ktownsend 0:87a7fc231fae 169 }