BLE_Button is a BLE service template. It handles a read-only characteristic with a simple input (boolean values). The input's source is the button on the board itself - the characteristic's value changes when the button is pressed or released. The canonical source for this example lives at https://github.com/ARMmbed/mbed-os-example-ble/tree/master/BLE_Button
main.cpp
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 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 #include <events/mbed_events.h> 00017 00018 #include <mbed.h> 00019 #include "ble/BLE.h" 00020 #include "ble/Gap.h" 00021 #include "ButtonService.h" 00022 #include "pretty_printer.h" 00023 00024 const static char DEVICE_NAME[] = "Button"; 00025 00026 static EventQueue event_queue(/* event count */ 10 * EVENTS_EVENT_SIZE); 00027 00028 00029 class BatteryDemo : ble::Gap::EventHandler { 00030 public: 00031 BatteryDemo(BLE &ble, events::EventQueue &event_queue) : 00032 _ble(ble), 00033 _event_queue(event_queue), 00034 _led1(LED1, 1), 00035 _button(BLE_BUTTON_PIN_NAME, BLE_BUTTON_PIN_PULL), 00036 _button_service(NULL), 00037 _button_uuid(ButtonService::BUTTON_SERVICE_UUID), 00038 _adv_data_builder(_adv_buffer) { } 00039 00040 void start() { 00041 _ble.gap().setEventHandler(this); 00042 00043 _ble.init(this, &BatteryDemo::on_init_complete); 00044 00045 _event_queue.call_every(500, this, &BatteryDemo::blink); 00046 00047 _event_queue.dispatch_forever(); 00048 } 00049 00050 private: 00051 /** Callback triggered when the ble initialization process has finished */ 00052 void on_init_complete(BLE::InitializationCompleteCallbackContext *params) { 00053 if (params->error != BLE_ERROR_NONE) { 00054 printf("Ble initialization failed."); 00055 return; 00056 } 00057 00058 print_mac_address(); 00059 00060 /* Setup primary service. */ 00061 00062 _button_service = new ButtonService(_ble, false /* initial value for button pressed */); 00063 00064 _button.fall(Callback<void()>(this, &BatteryDemo::button_pressed)); 00065 _button.rise(Callback<void()>(this, &BatteryDemo::button_released)); 00066 00067 start_advertising(); 00068 } 00069 00070 void start_advertising() { 00071 /* Create advertising parameters and payload */ 00072 00073 ble::AdvertisingParameters adv_parameters( 00074 ble::advertising_type_t::CONNECTABLE_UNDIRECTED, 00075 ble::adv_interval_t(ble::millisecond_t(1000)) 00076 ); 00077 00078 _adv_data_builder.setFlags(); 00079 _adv_data_builder.setLocalServiceList(mbed::make_Span(&_button_uuid, 1)); 00080 _adv_data_builder.setName(DEVICE_NAME); 00081 00082 /* Setup advertising */ 00083 00084 ble_error_t error = _ble.gap().setAdvertisingParameters( 00085 ble::LEGACY_ADVERTISING_HANDLE, 00086 adv_parameters 00087 ); 00088 00089 if (error) { 00090 print_error(error, "_ble.gap().setAdvertisingParameters() failed"); 00091 return; 00092 } 00093 00094 error = _ble.gap().setAdvertisingPayload( 00095 ble::LEGACY_ADVERTISING_HANDLE, 00096 _adv_data_builder.getAdvertisingData() 00097 ); 00098 00099 if (error) { 00100 print_error(error, "_ble.gap().setAdvertisingPayload() failed"); 00101 return; 00102 } 00103 00104 /* Start advertising */ 00105 00106 error = _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE); 00107 00108 if (error) { 00109 print_error(error, "_ble.gap().startAdvertising() failed"); 00110 return; 00111 } 00112 } 00113 00114 void button_pressed(void) { 00115 _event_queue.call(Callback<void(bool)>(_button_service, &ButtonService::updateButtonState), true); 00116 } 00117 00118 void button_released(void) { 00119 _event_queue.call(Callback<void(bool)>(_button_service, &ButtonService::updateButtonState), false); 00120 } 00121 00122 void blink(void) { 00123 _led1 = !_led1; 00124 } 00125 00126 private: 00127 /* Event handler */ 00128 00129 virtual void onDisconnectionComplete(const ble::DisconnectionCompleteEvent&) { 00130 _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE); 00131 } 00132 00133 private: 00134 BLE &_ble; 00135 events::EventQueue &_event_queue; 00136 00137 DigitalOut _led1; 00138 InterruptIn _button; 00139 ButtonService *_button_service; 00140 00141 UUID _button_uuid; 00142 00143 uint8_t _adv_buffer[ble::LEGACY_ADVERTISING_MAX_SIZE]; 00144 ble::AdvertisingDataBuilder _adv_data_builder; 00145 }; 00146 00147 /** Schedule processing of events from the BLE middleware in the event queue. */ 00148 void schedule_ble_events(BLE::OnEventsToProcessCallbackContext *context) { 00149 event_queue.call(Callback<void()>(&context->ble, &BLE::processEvents)); 00150 } 00151 00152 int main() 00153 { 00154 BLE &ble = BLE::Instance(); 00155 ble.onEventsToProcess(schedule_ble_events); 00156 00157 BatteryDemo demo(ble, event_queue); 00158 demo.start(); 00159 00160 return 0; 00161 } 00162
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