main.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2015 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 
00017 #include <events/mbed_events.h>
00018 #include <mbed.h>
00019 #include "ble/BLE.h"
00020 #include "ble/Gap.h"
00021 #include "ble/services/HeartRateService.h"
00022 
00023 DigitalOut led1(LED1, 1);
00024 
00025 const static char     DEVICE_NAME[] = "HRM";
00026 static const uint16_t uuid16_list[] = {GattService::UUID_HEART_RATE_SERVICE};
00027 
00028 static uint8_t hrmCounter = 100; // init HRM to 100bps
00029 static HeartRateService *hrServicePtr;
00030 
00031 static EventQueue eventQueue(/* event count */ 16 * EVENTS_EVENT_SIZE);
00032 
00033 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
00034 {
00035     BLE::Instance().gap().startAdvertising(); // restart advertising
00036 }
00037 
00038 void updateSensorValue() {
00039     // Do blocking calls or whatever is necessary for sensor polling.
00040     // In our case, we simply update the HRM measurement.
00041     hrmCounter++;
00042 
00043     //  100 <= HRM bps <=175
00044     if (hrmCounter == 175) {
00045         hrmCounter = 100;
00046     }
00047 
00048     hrServicePtr->updateHeartRate(hrmCounter);
00049 }
00050 
00051 void periodicCallback(void)
00052 {
00053     led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
00054 
00055     if (BLE::Instance().getGapState().connected) {
00056         eventQueue.call(updateSensorValue);
00057     }
00058 }
00059 
00060 void onBleInitError(BLE &ble, ble_error_t error)
00061 {
00062     (void)ble;
00063     (void)error;
00064    /* Initialization error handling should go here */
00065 }
00066 
00067 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
00068 {
00069     BLE&        ble   = params->ble;
00070     ble_error_t error = params->error;
00071 
00072     if (error != BLE_ERROR_NONE) {
00073         onBleInitError(ble, error);
00074         return;
00075     }
00076 
00077     if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
00078         return;
00079     }
00080 
00081     ble.gap().onDisconnection(disconnectionCallback);
00082 
00083     /* Setup primary service. */
00084     hrServicePtr = new HeartRateService(ble, hrmCounter, HeartRateService::LOCATION_FINGER);
00085 
00086     /* Setup advertising. */
00087     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
00088     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
00089     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
00090     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
00091     ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
00092     ble.gap().setAdvertisingInterval(1000); /* 1000ms */
00093     ble.gap().startAdvertising();
00094 }
00095 
00096 void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
00097     BLE &ble = BLE::Instance();
00098     eventQueue.call(Callback<void()>(&ble, &BLE::processEvents));
00099 }
00100 
00101 int main()
00102 {
00103     eventQueue.call_every(500, periodicCallback);
00104 
00105     BLE &ble = BLE::Instance();
00106     ble.onEventsToProcess(scheduleBleEventsProcessing);
00107     ble.init(bleInitComplete);
00108 
00109     eventQueue.dispatch_forever();
00110 
00111     return 0;
00112 }