Diff: source/main.cpp
- Revision:
- 0:38e06c586f64
- Child:
- 1:b07c6505284b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/source/main.cpp Thu Apr 23 07:55:49 2020 +0000
@@ -0,0 +1,173 @@
+/* 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;
+}
+
Karl Chuang
