Bluetooth Low Energy enabled device with "Switch" feature, compatible with BlueST Protocol.

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main.cpp

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00001 /**
00002  *******************************************************************************
00003  * @file    main.cpp
00004  * @author  Davide Aliprandi, STMicroelectronics
00005  * @version V1.0.0
00006  * @date    March 31st, 2018
00007  * @brief   mbed test application for the STMicroelectronics X-NUCLEO-IDB05A1
00008  *          Bluetooth Low energy Expansion Board.
00009  *******************************************************************************
00010  * @attention
00011  *
00012  * <h2><center>&copy; COPYRIGHT(c) 2018 STMicroelectronics</center></h2>
00013  *
00014  * Redistribution and use in source and binary forms, with or without
00015  * modification, are permitted provided that the following conditions are met:
00016  *   1. Redistributions of source code must retain the above copyright notice,
00017  *      this list of conditions and the following disclaimer.
00018  *   2. Redistributions in binary form must reproduce the above copyright
00019  *      notice, this list of conditions and the following disclaimer in the
00020  *      documentation and/or other materials provided with the distribution.
00021  *   3. Neither the name of STMicroelectronics nor the names of its
00022  *      contributors may be used to endorse or promote products derived from
00023  *      this software without specific prior written permission.
00024  *
00025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 
00029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00035  * POSSIBILITY OF SUCH DAMAGE.
00036  *
00037  *******************************************************************************
00038  */
00039 
00040 
00041 /* Includes ------------------------------------------------------------------*/
00042 
00043 /* mbed specific header files. */
00044 #include <events/mbed_events.h>
00045 #include <mbed.h>
00046 #include "ble/BLE.h"
00047 #include "CustomService.h"
00048 
00049 
00050 /* Definitions ---------------------------------------------------------------*/
00051 
00052 #define BLE_ADVERTISING_INTERVAL_ms 1000
00053 #define BLUETOOTH_PERIODIC_CALLBACK_ms 500
00054 #define DELAY_1 100
00055 
00056 
00057 /* Variables -----------------------------------------------------------------*/
00058 
00059 /* Switch and toggle state. */
00060 CustomService::switch_state_t switch_state;
00061 bool toggle_state;
00062 
00063 /* LED to indicate system state. */
00064 DigitalOut led_state(LED1); //Conflicts with SPI CLK on D13.
00065 
00066 /* Bluetooth. */
00067 const static char    DEVICE_NAME[] = "SWITCH_DEVICE";
00068 const static uint8_t MANUFACTURER_SPECIFIC_DATA[]= {0x01,0x80,0x20,0x00,0x00,0x00};
00069 static EventQueue event_queue(/* event count */ 10 * EVENTS_EVENT_SIZE);
00070 CustomService *custom_service;
00071 
00072 /* Button event. */
00073 InterruptIn event(USER_BUTTON);
00074 
00075 
00076 /* Bluetooth related functions -----------------------------------------------*/
00077 
00078 void on_disconnection_callback(const Gap::DisconnectionCallbackParams_t *params)
00079 {
00080     (void) params;
00081     BLE::Instance().gap().startAdvertising();
00082 }
00083 
00084 /**
00085  * This callback allows the custom service to read updates from the
00086  * characteristic.
00087  *
00088  * @param[in] params
00089  *     Information about the characterisitc being updated.
00090  */
00091 /*
00092 void on_data_read_callback(const GattReadCallbackParams *params) {
00093     static uint16_t time_stamp = 0;
00094 
00095     if (params->handle == custom_service->getValueHandle()) {
00096         // Reading led state and sending it via bluetooth.
00097         if (BLE::Instance().getGapState().connected) {
00098             event_queue.call(Callback<void(uint16_t, uint8_t)>(custom_service, &CustomService::send_state), time_stamp++, led_state.read() ? CustomService::SWITCH_ON : CustomService::SWITCH_OFF);
00099         }
00100     }
00101 }
00102 */
00103 
00104 /**
00105  * This callback allows the custom service to write updates to the
00106  * characteristic.
00107  *
00108  * @param[in] params
00109  *     Information about the characterisitc being updated.
00110  */
00111 void on_data_written_callback(const GattWriteCallbackParams *params) {
00112 
00113     if (params->handle == custom_service->getValueHandle()) {
00114         /* Receiving command via bluetooth and writing it to the led state. */
00115         led_state.write(((CustomService::switch_state_t) ((uint8_t *) (params->data))[SWITCH_DATA_INDEX]));
00116     }
00117 }
00118 
00119 /**
00120  * This function is called periodically.
00121  */
00122 void periodic_callback(void)
00123 {
00124     static uint16_t time_stamp = 0;
00125 
00126     /* Reading toggle command and sending it via bluetooth. */
00127     if (toggle_state) {
00128         if (BLE::Instance().getGapState().connected) {
00129             event_queue.call(Callback<void(uint16_t, uint8_t)>(custom_service, &CustomService::send_state), time_stamp++, switch_state);
00130             toggle_state = false;
00131         }
00132     }
00133 }
00134 
00135 /**
00136  * This function is called when the ble initialization process has failled.
00137  */
00138 void on_ble_init_error_callback(BLE &ble, ble_error_t error)
00139 {
00140     /* Initialization error handling should go here */
00141 }
00142 
00143 /**
00144  * Callback triggered when the ble initialization process has finished.
00145  */
00146 void ble_init_complete(BLE::InitializationCompleteCallbackContext *params)
00147 {
00148     BLE& ble   = params->ble;
00149     ble_error_t error = params->error;
00150 
00151     if (error != BLE_ERROR_NONE) {
00152         /* In case of error, forward the error handling to on_ble_init_error_callback */
00153         on_ble_init_error_callback(ble, error);
00154         return;
00155     }
00156 
00157     /* Ensure that it is the default instance of BLE */
00158     if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
00159         return;
00160     }
00161 
00162     ble.gap().onDisconnection(on_disconnection_callback);
00163     ble.gattServer().onDataWritten(on_data_written_callback);
00164     //ble.gattServer().onDataRead(on_data_read_callback);
00165 
00166     custom_service = new CustomService(ble);
00167 
00168     /* Setup advertising data. */
00169     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
00170     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS, (uint8_t *) CUSTOM_SERVICE_UUID, sizeof(CUSTOM_SERVICE_UUID));
00171     ble.gap().accumulateScanResponse(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA, MANUFACTURER_SPECIFIC_DATA, sizeof(MANUFACTURER_SPECIFIC_DATA));
00172     ble.gap().accumulateScanResponse(GapAdvertisingData::COMPLETE_LOCAL_NAME, (const uint8_t *) DEVICE_NAME, sizeof(DEVICE_NAME) - 1);
00173     ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
00174     ble.gap().setAdvertisingInterval(BLE_ADVERTISING_INTERVAL_ms);
00175     ble.gap().startAdvertising();
00176 }
00177 
00178 void schedule_ble_events_processing(BLE::OnEventsToProcessCallbackContext* context) {
00179     BLE &ble = BLE::Instance();
00180     event_queue.call(Callback<void()>(&ble, &BLE::processEvents));
00181 }
00182 
00183 
00184 /* Custom service related functions ------------------------------------------*/
00185 
00186 void button_callback(void) {
00187     switch_state = (CustomService::switch_state_t) (CustomService::SWITCH_ON - switch_state);
00188     toggle_state = true;
00189 }
00190 
00191 
00192 /* Main function -------------------------------------------------------------*/
00193 
00194 int main()
00195 {
00196     /*----- Initialization. -----*/
00197 
00198     /* Printing to the console. */
00199     printf("Switch Node Application Example\r\n\n");
00200 
00201     /* Bluetooth. */
00202     event_queue.call_every(BLUETOOTH_PERIODIC_CALLBACK_ms, periodic_callback);
00203     BLE &ble = BLE::Instance();
00204     ble.onEventsToProcess(schedule_ble_events_processing);
00205     ble.init(ble_init_complete);
00206 
00207     /* Attaching and enabling interrupt handlers. */
00208     event.fall(button_callback);
00209 
00210     /* Setting up initial state: switch feature OFF, i.e. led OFF, and no toggle
00211        state triggered. */
00212     switch_state = CustomService::SWITCH_OFF;
00213     led_state.write(switch_state);
00214     toggle_state = false;
00215 
00216     /* Start. */
00217     event_queue.dispatch_forever();
00218 
00219     return 0;
00220 }