Diff: source/main.cpp

Revision:

0:dbcc46819a5e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/main.cpp	Fri Nov 15 15:31:52 2019 +0000
@@ -0,0 +1,168 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2014 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.h"
+#include "pretty_printer.h"
+
+static DigitalOut led1(LED1, 1);
+
+const static char DEVICE_NAME[] = "STEP COUNTER";
+
+const static uint16_t STEP_COUNTER_SERVICE_UUID = 0xA000;
+const static uint16_t STEP_COUNTER_CHARACTERISTIC_UUID = 0xA001;
+
+int step_count = 0;
+int id = 0;
+ReadWriteGattCharacteristic<int> step_count_state(STEP_COUNTER_CHARACTERISTIC_UUID, &step_count, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
+
+static events::EventQueue event_queue(/* event count */ 16 * EVENTS_EVENT_SIZE);
+
+class StepCounter : ble::Gap::EventHandler {
+public:
+    StepCounter(BLE &ble, events::EventQueue &event_queue) :
+        _ble(ble),
+        _event_queue(event_queue),
+        _step_counter_uuid(STEP_COUNTER_SERVICE_UUID),
+        _adv_data_builder(_adv_buffer) { }
+
+    void start() {
+        _ble.gap().setEventHandler(this);
+
+        _ble.init(this, &StepCounter::on_init_complete);
+        _event_queue.call_every(500, this, &StepCounter::blink);
+        _event_queue.call_every(1000, this, &StepCounter::update_step_count);
+
+        _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) {
+            print_error(params->error, "Ble initialization failed.");
+            return;
+        }
+        
+        _ble.gattServer().onDataWritten(this, &StepCounter::on_data_written);
+
+        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.setLocalServiceList(mbed::make_Span(&_step_counter_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) {
+            print_error(error, "_ble.gap().setAdvertisingParameters() failed");
+            return;
+        }
+
+        error = _ble.gap().setAdvertisingPayload(
+            ble::LEGACY_ADVERTISING_HANDLE,
+            _adv_data_builder.getAdvertisingData()
+        );
+
+        if (error) {
+            print_error(error, "_ble.gap().setAdvertisingPayload() failed");
+            return;
+        }
+
+        /* Start advertising */
+
+        error = _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE);
+
+        if (error) {
+            print_error(error, "_ble.gap().startAdvertising() failed");
+            return;
+        }
+    }
+    
+    void on_data_written(const GattWriteCallbackParams *params) {
+        if ((params->handle == step_count_state.getValueHandle()) && (params->len == 1)) {
+            step_count = *(params->data);
+        }
+        step_count = 0;
+    }
+
+    void update_step_count() {
+        if (_ble.gap().getState().connected) {
+            step_count++;
+
+            _ble.gattServer().write(step_count_state.getValueHandle(), (uint8_t *)&step_count, sizeof(int));
+        }
+    }
+
+    void blink(void) {
+        led1 = !led1;
+    }
+
+private:
+    /* Event handler */
+
+    void onDisconnectionComplete(const ble::DisconnectionCompleteEvent&) {
+        _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE);
+    }
+
+private:
+    BLE &_ble;
+    events::EventQueue &_event_queue;
+    
+    UUID _step_counter_uuid;
+
+    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();
+    
+    GattCharacteristic *charTable[] = {&step_count_state};
+    GattService step_count_service(STEP_COUNTER_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+    ble.addService(step_count_service);
+    
+    ble.onEventsToProcess(schedule_ble_events);
+
+    StepCounter demo(ble, event_queue);
+    demo.start();
+
+    return 0;
+}