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 
00021 #if !defined(IDB0XA1_D13_PATCH)
00022 DigitalOut led1(LED1, 1);   // LED conflicts SPI_CLK in case of D13 patch
00023 #endif  
00024 
00025 const static char     DEVICE_NAME[]        = "HRM1";
00026 static const uint16_t uuid16_list[]        = {GattService::UUID_HEART_RATE_SERVICE};
00027 
00028 static volatile bool  triggerSensorPolling = false;
00029 
00030 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
00031 {
00032     (void)params;
00033     BLE::Instance().gap().startAdvertising(); // restart advertising
00034 }
00035 
00036 void periodicCallback(void)
00037 {
00038 #if !defined(IDB0XA1_D13_PATCH)
00039     led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
00040 #endif
00041 
00042     /* Note that the periodicCallback() executes in interrupt context, so it is safer to do
00043      * heavy-weight sensor polling from the main thread. */
00044     triggerSensorPolling = true;
00045 }
00046 
00047 void onBleInitError(BLE &ble, ble_error_t error)
00048 {
00049     (void)ble;
00050     (void)error;
00051    /* Initialization error handling should go here */
00052 }
00053 
00054 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
00055 {
00056     BLE&        ble   = params->ble;
00057     ble_error_t error = params->error;
00058 
00059     if (error != BLE_ERROR_NONE) {
00060         onBleInitError(ble, error);
00061         return;
00062     }
00063 
00064     if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
00065         return;
00066     }
00067 
00068     ble.gap().onDisconnection(disconnectionCallback);
00069 
00070     /* Setup primary service. */
00071     uint8_t hrmCounter = 60; // init HRM to 60bps
00072     HeartRateService hrService(ble, hrmCounter, HeartRateService::LOCATION_FINGER);
00073 
00074     /* Setup advertising. */
00075     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
00076     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
00077     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
00078     ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
00079     ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
00080     ble.gap().setAdvertisingInterval(1000); /* 1000ms */
00081     ble.gap().startAdvertising();
00082 
00083     // infinite loop
00084     while (true) {
00085         // check for trigger from periodicCallback()
00086         if (triggerSensorPolling && ble.getGapState().connected) {
00087             triggerSensorPolling = false;
00088 
00089             // Do blocking calls or whatever is necessary for sensor polling.
00090             // In our case, we simply update the HRM measurement.
00091             hrmCounter++;
00092 
00093             //  60 <= HRM bps <= 100
00094             if (hrmCounter == 100) {
00095                 hrmCounter = 60;
00096             }
00097 
00098             // update bps
00099             hrService.updateHeartRate(hrmCounter);
00100         } else {
00101             ble.waitForEvent(); // low power wait for event
00102         }
00103     }
00104 }
00105 
00106 int main(void)
00107 {
00108     Ticker ticker;
00109     ticker.attach(periodicCallback, 1); // blink LED every second
00110 
00111     BLE::Instance().init(bleInitComplete);
00112 }
00113