Diff: source/main.cpp

Revision:

0:a1e69a052b91

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/main.cpp	Mon Aug 03 22:16:42 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;
+}
+