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@37:d310a72115c7, 2014-07-11 (annotated)

Committer:
Rohit Grover
Date:
Fri Jul 11 11:34:55 2014 +0100
Revision:
37:d310a72115c7
Parent:
36:ea2a1b4f51c1
Child:
39:6390604f904c
updated heart-rate demo to use the new connectionParams APIs

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"
Rohit Grover 34:44dc6efc0b50 19 #include "ble_hrs.h"
ktownsend 0:87a7fc231fae 20
Rohit Grover 10:2436164b692e 21 BLEDevice ble;
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 22:299658c5fa3c 25 * it will have an impact on code-size and power consumption. */
Rohit Grover 9:5d693381e883 26
Rohit Grover 9:5d693381e883 27 #if NEED_CONSOLE_OUTPUT
Rohit Grover 9:5d693381e883 28 Serial pc(USBTX, USBRX);
Rohit Grover 9:5d693381e883 29 #define DEBUG(...) { pc.printf(__VA_ARGS__); }
Rohit Grover 9:5d693381e883 30 #else
Rohit Grover 9:5d693381e883 31 #define DEBUG(...) /* nothing */
Rohit Grover 9:5d693381e883 32 #endif /* #if NEED_CONSOLE_OUTPUT */
ktownsend 0:87a7fc231fae 33
Rohit Grover 29:76d865c718a6 34 const static char DEVICE_NAME[] = "Nordic_HRM";
Rohit Grover 26:e6ad33b227c6 35
ktownsend 0:87a7fc231fae 36 /* Heart Rate Service */
ktownsend 0:87a7fc231fae 37 /* Service: https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
ktownsend 0:87a7fc231fae 38 /* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
ktownsend 0:87a7fc231fae 39 /* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
Rohit Grover 18:8a2e313f49cb 40 static uint8_t hrmCounter = 100;
Rohit Grover 18:8a2e313f49cb 41 static uint8_t bpm[2] = {0x00, hrmCounter};
Rohit Grover 20:58bff62d0f7a 42 GattCharacteristic hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, bpm, sizeof(bpm), sizeof(bpm),
Rohit Grover 20:58bff62d0f7a 43 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
Rohit Grover 34:44dc6efc0b50 44 static uint8_t location = BLE_HRS_BODY_SENSOR_LOCATION_FINGER;
Rohit Grover 18:8a2e313f49cb 45 GattCharacteristic hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR,
Rohit Grover 18:8a2e313f49cb 46 (uint8_t *)&location, sizeof(location), sizeof(location),
Rohit Grover 18:8a2e313f49cb 47 GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);
Rohit Grover 22:299658c5fa3c 48 GattCharacteristic *hrmChars[] = {&hrmRate, &hrmLocation, };
Rohit Grover 19:1713b11694ea 49 GattService hrmService(GattService::UUID_HEART_RATE_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
ktownsend 0:87a7fc231fae 50
Rohit Grover 30:3dc9e6f2bc8c 51 static const uint16_t uuid16_list[] = {GattService::UUID_HEART_RATE_SERVICE};
Rohit Grover 27:97adf2b76b9c 52
Rohit Grover 36:ea2a1b4f51c1 53 static volatile bool triggerSensorPolling = false; /* set to high periodically to indicate to the main thread that
Rohit Grover 36:ea2a1b4f51c1 54 * polling is necessary. */
Rohit Grover 37:d310a72115c7 55 static Gap::ConnectionParams_t connectionParams;
Rohit Grover 36:ea2a1b4f51c1 56
Rohit Grover 35:ba3e3174331a 57 void disconnectionCallback(Gap::Handle_t handle)
ktownsend 0:87a7fc231fae 58 {
Rohit Grover 35:ba3e3174331a 59 DEBUG("Disconnected handle %u!\n\r", handle);
Rohit Grover 9:5d693381e883 60 DEBUG("Restarting the advertising process\n\r");
rgrover1 7:daab8ba5139e 61 ble.startAdvertising();
rgrover1 7:daab8ba5139e 62 }
Rohit Grover 3:24e2b056d229 63
Rohit Grover 37:d310a72115c7 64 void onConnectionCallback(Gap::Handle_t handle)
Rohit Grover 37:d310a72115c7 65 {
Rohit Grover 37:d310a72115c7 66 DEBUG("connected. Got handle %u\r\n", handle);
Rohit Grover 37:d310a72115c7 67
Rohit Grover 37:d310a72115c7 68 connectionParams.slaveLatency = 1;
Rohit Grover 37:d310a72115c7 69 if (ble.updateConnectionParams(handle, &connectionParams) != BLE_ERROR_NONE) {
Rohit Grover 37:d310a72115c7 70 DEBUG("failed to update connection paramter\r\n");
Rohit Grover 37:d310a72115c7 71 }
Rohit Grover 37:d310a72115c7 72 }
Rohit Grover 37:d310a72115c7 73
Rohit Grover 13:3ca2045597e7 74 /**
Rohit Grover 36:ea2a1b4f51c1 75 * Triggered periodically by the 'ticker' interrupt.
Rohit Grover 13:3ca2045597e7 76 */
Rohit Grover 11:1d9aafee4984 77 void periodicCallback(void)
Rohit Grover 11:1d9aafee4984 78 {
Rohit Grover 11:1d9aafee4984 79 led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
Rohit Grover 36:ea2a1b4f51c1 80 triggerSensorPolling = true; /* Note that the periodicCallback() executes in
Rohit Grover 36:ea2a1b4f51c1 81 * interrupt context, so it is safer to do
Rohit Grover 36:ea2a1b4f51c1 82 * heavy-weight sensor polling from the main
Rohit Grover 36:ea2a1b4f51c1 83 * thread.*/
Rohit Grover 11:1d9aafee4984 84 }
Rohit Grover 11:1d9aafee4984 85
ktownsend 0:87a7fc231fae 86 int main(void)
ktownsend 0:87a7fc231fae 87 {
Rohit Grover 3:24e2b056d229 88 led1 = 1;
Rohit Grover 11:1d9aafee4984 89 Ticker ticker;
Rohit Grover 11:1d9aafee4984 90 ticker.attach(periodicCallback, 1);
ktownsend 0:87a7fc231fae 91
Rohit Grover 15:7ba28817e31e 92 DEBUG("Initialising the nRF51822\n\r");
Rohit Grover 15:7ba28817e31e 93 ble.init();
rgrover1 7:daab8ba5139e 94 ble.onDisconnection(disconnectionCallback);
Rohit Grover 37:d310a72115c7 95 ble.onConnection(onConnectionCallback);
Rohit Grover 37:d310a72115c7 96
Rohit Grover 37:d310a72115c7 97 ble.getPreferredConnectionParams(&connectionParams);
ktownsend 0:87a7fc231fae 98
Rohit Grover 15:7ba28817e31e 99 /* setup advertising */
Rohit Grover 29:76d865c718a6 100 ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
Rohit Grover 27:97adf2b76b9c 101 ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t*)uuid16_list, sizeof(uuid16_list));
rgrover1 7:daab8ba5139e 102 ble.accumulateAdvertisingPayload(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
Rohit Grover 29:76d865c718a6 103 ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
rgrover1 7:daab8ba5139e 104 ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
rgrover1 7:daab8ba5139e 105 ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */
rgrover1 7:daab8ba5139e 106 ble.startAdvertising();
Rohit Grover 3:24e2b056d229 107
Rohit Grover 11:1d9aafee4984 108 ble.addService(hrmService);
ktownsend 0:87a7fc231fae 109
Rohit Grover 11:1d9aafee4984 110 while (true) {
Rohit Grover 36:ea2a1b4f51c1 111 if (triggerSensorPolling) {
Rohit Grover 36:ea2a1b4f51c1 112 triggerSensorPolling = false;
Rohit Grover 36:ea2a1b4f51c1 113
Rohit Grover 36:ea2a1b4f51c1 114 /* Do blocking calls or whatever is necessary for sensor polling. */
Rohit Grover 36:ea2a1b4f51c1 115 /* In our case, we simply update the dummy HRM measurement. */
Rohit Grover 36:ea2a1b4f51c1 116 hrmCounter++;
Rohit Grover 36:ea2a1b4f51c1 117 if (hrmCounter == 175) {
Rohit Grover 36:ea2a1b4f51c1 118 hrmCounter = 100;
Rohit Grover 36:ea2a1b4f51c1 119 }
Rohit Grover 36:ea2a1b4f51c1 120
Rohit Grover 36:ea2a1b4f51c1 121 if (ble.getGapState().connected) {
Rohit Grover 36:ea2a1b4f51c1 122 /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
Rohit Grover 36:ea2a1b4f51c1 123 /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
Rohit Grover 36:ea2a1b4f51c1 124 bpm[1] = hrmCounter;
Rohit Grover 36:ea2a1b4f51c1 125 ble.updateCharacteristicValue(hrmRate.getHandle(), bpm, sizeof(bpm));
Rohit Grover 36:ea2a1b4f51c1 126 }
Rohit Grover 36:ea2a1b4f51c1 127 } else {
Rohit Grover 36:ea2a1b4f51c1 128 ble.waitForEvent();
Rohit Grover 36:ea2a1b4f51c1 129 }
ktownsend 0:87a7fc231fae 130 }
ktownsend 0:87a7fc231fae 131 }