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main.cpp
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main.cpp
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/* mbed Microcontroller Library
* Copyright (c) 2006-2015 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <events/mbed_events.h>
#include <mbed.h>
#include "ble/BLE.h"
#include "ble/gap/Gap.h"
#include "ble/services/HeartRateService.h"
#include "pretty_printer.h"
const static char DEVICE_NAME[] = "Heartrate";
static events::EventQueue event_queue(/* event count */ 16 * EVENTS_EVENT_SIZE);
class HeartrateDemo : ble::Gap::EventHandler {
public:
HeartrateDemo(BLE &ble, events::EventQueue &event_queue) :
_ble(ble),
_event_queue(event_queue),
_led1(LED1, 1),
_connected(false),
_hr_uuid(GattService::UUID_HEART_RATE_SERVICE),
_hr_counter(100),
_hr_service(ble, _hr_counter, HeartRateService::LOCATION_FINGER),
_adv_data_builder(_adv_buffer) { }
void start() {
_ble.gap().setEventHandler(this);
_ble.init(this, &HeartrateDemo::on_init_complete);
_event_queue.call_every(500, this, &HeartrateDemo::blink);
_event_queue.call_every(1000, this, &HeartrateDemo::update_sensor_value);
_event_queue.dispatch_forever();
}
private:
/** Callback triggered when the ble initialization process has finished */
void on_init_complete(BLE::InitializationCompleteCallbackContext *params) {
if (params->error != BLE_ERROR_NONE) {
printf("Ble initialization failed.");
return;
}
print_mac_address();
start_advertising();
}
void start_advertising() {
/* Create advertising parameters and payload */
ble::AdvertisingParameters adv_parameters(
ble::advertising_type_t::CONNECTABLE_UNDIRECTED,
ble::adv_interval_t(ble::millisecond_t(1000))
);
_adv_data_builder.setFlags();
_adv_data_builder.setAppearance(ble::adv_data_appearance_t::GENERIC_HEART_RATE_SENSOR);
_adv_data_builder.setLocalServiceList(mbed::make_Span(&_hr_uuid, 1));
_adv_data_builder.setName(DEVICE_NAME);
/* Setup advertising */
ble_error_t error = _ble.gap().setAdvertisingParameters(
ble::LEGACY_ADVERTISING_HANDLE,
adv_parameters
);
if (error) {
printf("_ble.gap().setAdvertisingParameters() failed\r\n");
return;
}
error = _ble.gap().setAdvertisingPayload(
ble::LEGACY_ADVERTISING_HANDLE,
_adv_data_builder.getAdvertisingData()
);
if (error) {
printf("_ble.gap().setAdvertisingPayload() failed\r\n");
return;
}
/* Start advertising */
error = _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE);
if (error) {
printf("_ble.gap().startAdvertising() failed\r\n");
return;
}
}
void update_sensor_value() {
if (_connected) {
// Do blocking calls or whatever is necessary for sensor polling.
// In our case, we simply update the HRM measurement.
_hr_counter++;
// 100 <= HRM bps <=175
if (_hr_counter == 175) {
_hr_counter = 100;
}
_hr_service.updateHeartRate(_hr_counter);
}
}
void blink(void) {
_led1 = !_led1;
}
private:
/* Event handler */
void onDisconnectionComplete(const ble::DisconnectionCompleteEvent&) {
_ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE);
_connected = false;
}
virtual void onConnectionComplete(const ble::ConnectionCompleteEvent &event) {
if (event.getStatus() == BLE_ERROR_NONE) {
_connected = true;
}
}
private:
BLE &_ble;
events::EventQueue &_event_queue;
DigitalOut _led1;
bool _connected;
UUID _hr_uuid;
uint8_t _hr_counter;
HeartRateService _hr_service;
uint8_t _adv_buffer[ble::LEGACY_ADVERTISING_MAX_SIZE];
ble::AdvertisingDataBuilder _adv_data_builder;
};
/** Schedule processing of events from the BLE middleware in the event queue. */
void schedule_ble_events(BLE::OnEventsToProcessCallbackContext *context) {
event_queue.call(Callback<void()>(&context->ble, &BLE::processEvents));
}
int main()
{
BLE &ble = BLE::Instance();
ble.onEventsToProcess(schedule_ble_events);
HeartrateDemo demo(ble, event_queue);
demo.start();
return 0;
}