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 "mbed.h"
00018 #include "ble/BLE.h"
00019 #include "ble/services/HeartRateService.h"
00020 #include "ble/services/BatteryService.h"
00021 #include "ble/services/DeviceInformationService.h"
00022 
00023 DigitalOut led1(LED1);
00024 
00025 const static char     DEVICE_NAME[]        = "HRM1";
00026 static const uint16_t uuid16_list[]        = {GattService::UUID_HEART_RATE_SERVICE,
00027                                               GattService::UUID_DEVICE_INFORMATION_SERVICE};
00028 static volatile bool  triggerSensorPolling = false;
00029 
00030 uint8_t hrmCounter = 100; // init HRM to 100bps
00031 
00032 HeartRateService         *hrService;
00033 DeviceInformationService *deviceInfo;
00034 
00035 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
00036 {
00037     BLE::Instance(BLE::DEFAULT_INSTANCE).gap().startAdvertising(); // restart advertising
00038 }
00039 
00040 void periodicCallback(void)
00041 {
00042     led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
00043 
00044     /* Note that the periodicCallback() executes in interrupt context, so it is safer to do
00045      * heavy-weight sensor polling from the main thread. */
00046     triggerSensorPolling = true;
00047 }
00048 
00049 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
00050 {
00051     BLE &ble          = params->ble;
00052     ble_error_t error = params->error;
00053 
00054     if (error != BLE_ERROR_NONE) {
00055         return;
00056     }
00057 
00058     ble.gap().onDisconnection(disconnectionCallback);
00059 
00060     /* Setup primary service. */
00061     hrService = new HeartRateService(ble, hrmCounter, HeartRateService::LOCATION_FINGER);
00062 
00063     /* Setup auxiliary service. */
00064     deviceInfo = new DeviceInformationService(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1");
00065 
00066     /* Setup advertising. */
00067     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
00068     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
00069     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
00070     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
00071     ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
00072     ble.gap().setAdvertisingInterval(1000); /* 1000ms */
00073     ble.gap().startAdvertising();
00074 }
00075 
00076 int main(void)
00077 {
00078     led1 = 1;
00079     Ticker ticker;
00080     ticker.attach(periodicCallback, 1); // blink LED every second
00081 
00082     BLE& ble = BLE::Instance(BLE::DEFAULT_INSTANCE);
00083     ble.init(bleInitComplete);
00084 
00085     /* SpinWait for initialization to complete. This is necessary because the
00086      * BLE object is used in the main loop below. */
00087     while (ble.hasInitialized()  == false) { /* spin loop */ }
00088 
00089     // infinite loop
00090     while (1) {
00091         // check for trigger from periodicCallback()
00092         if (triggerSensorPolling && ble.getGapState().connected) {
00093             triggerSensorPolling = false;
00094 
00095             // Do blocking calls or whatever is necessary for sensor polling.
00096             // In our case, we simply update the HRM measurement.
00097             hrmCounter++;
00098             if (hrmCounter == 175) { //  100 <= HRM bps <=175
00099                 hrmCounter = 100;
00100             }
00101 
00102             hrService->updateHeartRate(hrmCounter);
00103         } else {
00104             ble.waitForEvent(); // low power wait for event
00105         }
00106     }
00107 }