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@22:299658c5fa3c, 2014-06-12 (annotated)

Committer:
Rohit Grover
Date:
Thu Jun 12 08:12:51 2014 +0100
Revision:
22:299658c5fa3c
Parent:
20:58bff62d0f7a
Child:
26:e6ad33b227c6
simplify demo to only contain the heart-rate service

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;
Rohit Grover 3:24e2b056d229 21 DigitalOut led1(LED1);
Rohit Grover 9:5d693381e883 22
Rohit Grover 9:5d693381e883 23 #define NEED_CONSOLE_OUTPUT 0 /* Set this if you need debug messages on the console;
Rohit Grover 22:299658c5fa3c 24 * it will have an impact on code-size and power consumption. */
Rohit Grover 9:5d693381e883 25
Rohit Grover 9:5d693381e883 26 #if NEED_CONSOLE_OUTPUT
Rohit Grover 9:5d693381e883 27 Serial pc(USBTX, USBRX);
Rohit Grover 9:5d693381e883 28 #define DEBUG(...) { pc.printf(__VA_ARGS__); }
Rohit Grover 9:5d693381e883 29 #else
Rohit Grover 9:5d693381e883 30 #define DEBUG(...) /* nothing */
Rohit Grover 9:5d693381e883 31 #endif /* #if NEED_CONSOLE_OUTPUT */
ktownsend 0:87a7fc231fae 32
ktownsend 0:87a7fc231fae 33 /* Heart Rate Service */
ktownsend 0:87a7fc231fae 34 /* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
ktownsend 0:87a7fc231fae 35 /* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
ktownsend 0:87a7fc231fae 36 /* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 18:8a2e313f49cb 37 static uint8_t hrmCounter = 100;
Rohit Grover 18:8a2e313f49cb 38 static uint8_t bpm[2] = {0x00, hrmCounter};
Rohit Grover 20:58bff62d0f7a 39 GattCharacteristic hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, bpm, sizeof(bpm), sizeof(bpm),
Rohit Grover 20:58bff62d0f7a 40 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
Rohit Grover 18:8a2e313f49cb 41 static const uint8_t location = 0x03; /* Finger */
Rohit Grover 18:8a2e313f49cb 42 GattCharacteristic hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR,
Rohit Grover 18:8a2e313f49cb 43 (uint8_t *)&location, sizeof(location), sizeof(location),
Rohit Grover 18:8a2e313f49cb 44 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
Rohit Grover 22:299658c5fa3c 45 GattCharacteristic *hrmChars[] = {&hrmRate, &hrmLocation, };
Rohit Grover 19:1713b11694ea 46 GattService hrmService(GattService::UUID_HEART_RATE_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
ktownsend 0:87a7fc231fae 47
rgrover1 7:daab8ba5139e 48 void disconnectionCallback(void)
ktownsend 0:87a7fc231fae 49 {
Rohit Grover 9:5d693381e883 50 DEBUG("Disconnected!\n\r");
Rohit Grover 9:5d693381e883 51 DEBUG("Restarting the advertising process\n\r");
rgrover1 7:daab8ba5139e 52 ble.startAdvertising();
rgrover1 7:daab8ba5139e 53 }
Rohit Grover 3:24e2b056d229 54
Rohit Grover 13:3ca2045597e7 55 /**
Rohit Grover 22:299658c5fa3c 56 * Triggered periodically by the 'ticker' interrupt; updates hrmCounter.
Rohit Grover 13:3ca2045597e7 57 */
Rohit Grover 11:1d9aafee4984 58 void periodicCallback(void)
Rohit Grover 11:1d9aafee4984 59 {
Rohit Grover 11:1d9aafee4984 60 led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 11:1d9aafee4984 61
Rohit Grover 11:1d9aafee4984 62 if (ble.getGapState().connected) {
Rohit Grover 11:1d9aafee4984 63 /* Update the HRM measurement */
Rohit Grover 11:1d9aafee4984 64 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
Rohit Grover 11:1d9aafee4984 65 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 11:1d9aafee4984 66 hrmCounter++;
Rohit Grover 11:1d9aafee4984 67 if (hrmCounter == 175) {
Rohit Grover 11:1d9aafee4984 68 hrmCounter = 100;
Rohit Grover 11:1d9aafee4984 69 }
Rohit Grover 18:8a2e313f49cb 70 bpm[1] = hrmCounter;
Rohit Grover 11:1d9aafee4984 71 ble.updateCharacteristicValue(hrmRate.getHandle(), bpm, sizeof(bpm));
Rohit Grover 11:1d9aafee4984 72 }
Rohit Grover 11:1d9aafee4984 73 }
Rohit Grover 11:1d9aafee4984 74
ktownsend 0:87a7fc231fae 75 int main(void)
ktownsend 0:87a7fc231fae 76 {
Rohit Grover 3:24e2b056d229 77 led1 = 1;
Rohit Grover 11:1d9aafee4984 78 Ticker ticker;
Rohit Grover 11:1d9aafee4984 79 ticker.attach(periodicCallback, 1);
ktownsend 0:87a7fc231fae 80
Rohit Grover 15:7ba28817e31e 81 DEBUG("Initialising the nRF51822\n\r");
Rohit Grover 15:7ba28817e31e 82 ble.init();
rgrover1 7:daab8ba5139e 83 ble.onDisconnection(disconnectionCallback);
ktownsend 0:87a7fc231fae 84
Rohit Grover 15:7ba28817e31e 85 /* setup advertising */
rgrover1 7:daab8ba5139e 86 ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
rgrover1 7:daab8ba5139e 87 ble.accumulateAdvertisingPayload(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
rgrover1 7:daab8ba5139e 88 ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
rgrover1 7:daab8ba5139e 89 ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
rgrover1 7:daab8ba5139e 90 ble.startAdvertising();
Rohit Grover 3:24e2b056d229 91
Rohit Grover 11:1d9aafee4984 92 ble.addService(hrmService);
ktownsend 0:87a7fc231fae 93
Rohit Grover 11:1d9aafee4984 94 while (true) {
Rohit Grover 11:1d9aafee4984 95 ble.waitForEvent();
ktownsend 0:87a7fc231fae 96 }
ktownsend 0:87a7fc231fae 97 }