File content as of revision 52:6bbf62943106:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "mbed.h"
#include "BLEDevice.h"
#include "HeartRateService.h"
#include "BatteryService.h"
#include "DeviceInformationService.h"

/* Enable the following if you need to throttle the connection interval. This has
 * the effect of reducing energy consumption after a connection is made;
 * particularly for applications where the central may want a fast connection
 * interval.*/
#define UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL 0

BLEDevice  ble;
DigitalOut led1(LED1);

const static char     DEVICE_NAME[]        = "Nordic_HRM";
static const uint16_t uuid16_list[]        = {GattService::UUID_HEART_RATE_SERVICE,
                                              GattService::UUID_BATTERY_SERVICE,
                                              GattService::UUID_DEVICE_INFORMATION_SERVICE};
static volatile bool  triggerSensorPolling = false;

void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
{
    ble.startAdvertising(); // restart advertising
}

void onConnectionCallback(Gap::Handle_t handle, Gap::addr_type_t peerAddrType, const Gap::address_t peerAddr, const Gap::ConnectionParams_t *params)
{
    #if UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL
    /* Updating connection parameters can be attempted only after a connection has been
     * established. Please note that the ble-Central is still the final arbiter for
     * the effective parameters; the peripheral can only hope that the request is
     * honored. Please also be mindful of the constraints that might be enforced by
     * the BLE stack on the underlying controller.*/
    #define MIN_CONN_INTERVAL 250  /**< Minimum connection interval (250 ms) */
    #define MAX_CONN_INTERVAL 350  /**< Maximum connection interval (350 ms). */
    #define CONN_SUP_TIMEOUT  6000 /**< Connection supervisory timeout (6 seconds). */
    #define SLAVE_LATENCY     4

        Gap::ConnectionParams_t gap_conn_params;
        gap_conn_params.minConnectionInterval        = Gap::MSEC_TO_GAP_DURATION_UNITS(MIN_CONN_INTERVAL);
        gap_conn_params.maxConnectionInterval        = Gap::MSEC_TO_GAP_DURATION_UNITS(MAX_CONN_INTERVAL);
        gap_conn_params.connectionSupervisionTimeout = Gap::MSEC_TO_GAP_DURATION_UNITS(CONN_SUP_TIMEOUT);
        gap_conn_params.slaveLatency                 = SLAVE_LATENCY;
        ble.updateConnectionParams(handle, &gap_conn_params);
    #endif /* #if UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL */
}

void periodicCallback(void)
{
    led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */

    /* Note that the periodicCallback() executes in interrupt context, so it is safer to do
     * heavy-weight sensor polling from the main thread. */
    triggerSensorPolling = true;
}

int main(void)
{
    led1 = 1;
    Ticker ticker;
    ticker.attach(periodicCallback, 1);

    ble.init();
    ble.onDisconnection(disconnectionCallback);
#if UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL
    ble.onConnection(onConnectionCallback);
#endif /* #if UPDATE_PARAMS_FOR_LONGER_CONNECTION_INTERVAL */

    /* Setup primary service. */
    uint8_t hrmCounter = 100;
    HeartRateService hrService(ble, hrmCounter, HeartRateService::LOCATION_FINGER);

    /* Setup auxiliary services. */
    BatteryService           battery(ble);
    DeviceInformationService deviceInfo(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1");

    /* Setup advertising. */
    ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
    ble.accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.setAdvertisingInterval(1600); /* 1000ms; in multiples of 0.625ms. */
    ble.startAdvertising();

    while (true) {
        if (triggerSensorPolling && ble.getGapState().connected) {
            triggerSensorPolling = false;

            /* Do blocking calls or whatever is necessary for sensor polling. */
            /* In our case, we simply update the dummy HRM measurement. */
            hrmCounter++;
            if (hrmCounter == 175) {
                hrmCounter = 100;
            }

            hrService.updateHeartRate(hrmCounter);
        } else {
            ble.waitForEvent();
        }
    }
}