main.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2015 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include <events/mbed_events.h>
00018 #include <mbed.h>
00019 #include "ble/BLE.h"
00020 #include "ble/gap/Gap.h"
00021 #include "ble/services/HeartRateService.h"
00022 #include "pretty_printer.h"
00023 
00024 const static char DEVICE_NAME[] = "Heartrate";
00025 
00026 static events::EventQueue event_queue(/* event count */ 16 * EVENTS_EVENT_SIZE);
00027 
00028 class HeartrateDemo : ble::Gap::EventHandler {
00029 public:
00030     HeartrateDemo(BLE &ble, events::EventQueue &event_queue) :
00031         _ble(ble),
00032         _event_queue(event_queue),
00033         _led1(LED1, 1),
00034         _connected(false),
00035         _hr_uuid(GattService::UUID_HEART_RATE_SERVICE),
00036         _hr_counter(100),
00037         _hr_service(ble, _hr_counter, HeartRateService::LOCATION_FINGER),
00038         _adv_data_builder(_adv_buffer) { }
00039 
00040     void start() {
00041         _ble.gap().setEventHandler(this);
00042 
00043         _ble.init(this, &HeartrateDemo::on_init_complete);
00044 
00045         _event_queue.call_every(500, this, &HeartrateDemo::blink);
00046         _event_queue.call_every(1000, this, &HeartrateDemo::update_sensor_value);
00047 
00048         _event_queue.dispatch_forever();
00049     }
00050 
00051 private:
00052     /** Callback triggered when the ble initialization process has finished */
00053     void on_init_complete(BLE::InitializationCompleteCallbackContext *params) {
00054         if (params->error != BLE_ERROR_NONE) {
00055             printf("Ble initialization failed.");
00056             return;
00057         }
00058 
00059         print_mac_address();
00060 
00061         start_advertising();
00062     }
00063 
00064     void start_advertising() {
00065         /* Create advertising parameters and payload */
00066 
00067         ble::AdvertisingParameters adv_parameters(
00068             ble::advertising_type_t::CONNECTABLE_UNDIRECTED,
00069             ble::adv_interval_t(ble::millisecond_t(1000))
00070         );
00071 
00072         _adv_data_builder.setFlags();
00073         _adv_data_builder.setAppearance(ble::adv_data_appearance_t::GENERIC_HEART_RATE_SENSOR);
00074         _adv_data_builder.setLocalServiceList(mbed::make_Span(&_hr_uuid, 1));
00075         _adv_data_builder.setName(DEVICE_NAME);
00076 
00077         /* Setup advertising */
00078 
00079         ble_error_t error = _ble.gap().setAdvertisingParameters(
00080             ble::LEGACY_ADVERTISING_HANDLE,
00081             adv_parameters
00082         );
00083 
00084         if (error) {
00085             printf("_ble.gap().setAdvertisingParameters() failed\r\n");
00086             return;
00087         }
00088 
00089         error = _ble.gap().setAdvertisingPayload(
00090             ble::LEGACY_ADVERTISING_HANDLE,
00091             _adv_data_builder.getAdvertisingData()
00092         );
00093 
00094         if (error) {
00095             printf("_ble.gap().setAdvertisingPayload() failed\r\n");
00096             return;
00097         }
00098 
00099         /* Start advertising */
00100 
00101         error = _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE);
00102 
00103         if (error) {
00104             printf("_ble.gap().startAdvertising() failed\r\n");
00105             return;
00106         }
00107     }
00108 
00109     void update_sensor_value() {
00110         if (_connected) {
00111             // Do blocking calls or whatever is necessary for sensor polling.
00112             // In our case, we simply update the HRM measurement.
00113             _hr_counter++;
00114 
00115             //  100 <= HRM bps <=175
00116             if (_hr_counter == 175) {
00117                 _hr_counter = 100;
00118             }
00119 
00120             _hr_service.updateHeartRate(_hr_counter);
00121         }
00122     }
00123 
00124     void blink(void) {
00125         _led1 = !_led1;
00126     }
00127 
00128 private:
00129     /* Event handler */
00130 
00131     void onDisconnectionComplete(const ble::DisconnectionCompleteEvent&) {
00132         _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE);
00133         _connected = false;
00134     }
00135 
00136     virtual void onConnectionComplete(const ble::ConnectionCompleteEvent &event) {
00137         if (event.getStatus() == BLE_ERROR_NONE) {
00138             _connected = true;
00139         }
00140     }
00141 
00142 private:
00143     BLE &_ble;
00144     events::EventQueue &_event_queue;
00145     DigitalOut _led1;
00146 
00147     bool _connected;
00148 
00149     UUID _hr_uuid;
00150 
00151     uint8_t _hr_counter;
00152     HeartRateService _hr_service;
00153 
00154     uint8_t _adv_buffer[ble::LEGACY_ADVERTISING_MAX_SIZE];
00155     ble::AdvertisingDataBuilder _adv_data_builder;
00156 };
00157 
00158 /** Schedule processing of events from the BLE middleware in the event queue. */
00159 void schedule_ble_events(BLE::OnEventsToProcessCallbackContext *context) {
00160     event_queue.call(Callback<void()>(&context->ble, &BLE::processEvents));
00161 }
00162 
00163 int main()
00164 {
00165     BLE &ble = BLE::Instance();
00166     ble.onEventsToProcess(schedule_ble_events);
00167 
00168     HeartrateDemo demo(ble, event_queue);
00169     demo.start();
00170 
00171     return 0;
00172 }
00173