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 
00017 #include "mbed.h"
00018 #include "BLEDevice.h"
00019 #include "HeartRateService.h"
00020 #include "DeviceInformationService.h"
00021 
00022 /* Enable the following if you need to throttle the connection interval. This has
00023  * the effect of reducing energy consumption after a connection is made;
00024  * particularly for applications where the central may want a fast connection
00025  * interval.*/
00026 #define UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL 0
00027 
00028 BLEDevice  ble;
00029 DigitalOut led1(LED1);
00030 
00031 const static char     DEVICE_NAME[]        = "HRM1";
00032 static const uint16_t uuid16_list[]        = {GattService::UUID_HEART_RATE_SERVICE,
00033                                               GattService::UUID_DEVICE_INFORMATION_SERVICE};
00034 static volatile bool  triggerSensorPolling = false;
00035 
00036 void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
00037 {
00038     ble.startAdvertising(); // restart advertising
00039 }
00040 
00041 void periodicCallback(void)
00042 {
00043     led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
00044 
00045     /* Note that the periodicCallback() executes in interrupt context, so it is safer to do
00046      * heavy-weight sensor polling from the main thread. */
00047     triggerSensorPolling = true;
00048 }
00049 
00050 int main(void)
00051 {
00052     led1 = 1;
00053     Ticker ticker;
00054     ticker.attach(periodicCallback, 1); // blink LED every second
00055 
00056     ble.init();
00057     ble.onDisconnection(disconnectionCallback);
00058 
00059     /* Setup primary service. */
00060     uint8_t hrmCounter = 100; // init HRM to 100bps
00061     HeartRateService hrService(ble, hrmCounter, HeartRateService::LOCATION_FINGER);
00062 
00063     /* Setup auxiliary service. */
00064     DeviceInformationService deviceInfo(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1");
00065 
00066     /* Setup advertising. */
00067     ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
00068     ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
00069     ble.accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
00070     ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
00071     ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
00072     ble.setAdvertisingInterval(1000);
00073     ble.startAdvertising();
00074 
00075     // infinite loop
00076     while (1) {
00077         // check for trigger from periodicCallback()
00078         if (triggerSensorPolling && ble.getGapState().connected) {
00079             triggerSensorPolling = false;
00080 
00081             // Do blocking calls or whatever is necessary for sensor polling.
00082             // In our case, we simply update the HRM measurement. 
00083             hrmCounter++;
00084             
00085             //  100 <= HRM bps <=175
00086             if (hrmCounter == 175) {
00087                 hrmCounter = 100;
00088             }
00089             
00090             // update bps
00091             hrService.updateHeartRate(hrmCounter);
00092         } else {
00093             ble.waitForEvent(); // low power wait for event
00094         }
00095     }
00096 }