File content as of revision 5:b0baff4a124f:

/* 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 "nRF51822n.h"

nRF51822n  nrf;                 /* BLE radio driver */

DigitalOut led1(LED1);
DigitalOut led2(LED2);
Ticker     flipper;
Serial     pc(USBTX, USBRX);

/* Battery Level Service */
uint8_t            batt      = 72; /* Battery level */
uint8_t            read_batt = 0; /* Variable to hold battery level reads */
GattService        battService (GattService::UUID_BATTERY_SERVICE);
GattCharacteristic battLevel   (GattCharacteristic::UUID_BATTERY_LEVEL_CHAR,
                                1,
                                1,
                                GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY |
                                GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);

/* Heart Rate Service */
/* Service:  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
/* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
/* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
GattService        hrmService    (GattService::UUID_HEART_RATE_SERVICE);
GattCharacteristic hrmRate       (
    GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR,
    2,
    3,
    GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
GattCharacteristic hrmLocation   (
    GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR,
    1,
    1,
    GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);

/* Device Information service */
uint8_t deviceName[4] = {'m', 'b', 'e', 'd'};
GattService        deviceInformationService (
    GattService::UUID_DEVICE_INFORMATION_SERVICE);
GattCharacteristic deviceManufacturer (
    GattCharacteristic::UUID_MANUFACTURER_NAME_STRING_CHAR,
    sizeof(deviceName),
    sizeof(deviceName),
    GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);

/* Advertising data and parameters */
GapAdvertisingData advData;
GapAdvertisingData scanResponse;
GapAdvertisingParams advParams (GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
uint16_t           uuid16_list[] = {GattService::UUID_BATTERY_SERVICE,
                                    GattService::UUID_DEVICE_INFORMATION_SERVICE,
                                    GattService::UUID_HEART_RATE_SERVICE};

void tickerCallback(void);

/**************************************************************************/
/*!
    @brief  This custom class can be used to override any GapEvents
            that you are interested in handling on an application level.
*/
/**************************************************************************/
class GapEventHandler : public GapEvents
{
    virtual void onTimeout(void)
    {
        pc.printf("Advertising Timeout!\n\r");
        // Restart the advertising process with a much slower interval,
        // only start advertising again after a button press, etc.
    }

    virtual void onConnected(void)
    {
        pc.printf("Connected!\n\r");
    }

    virtual void onDisconnected(void)
    {
        pc.printf("Disconnected!\n\r");
        pc.printf("Restarting the advertising process\n\r");
        nrf.getGap().startAdvertising(advParams);
    }
};

/**************************************************************************/
/*!
    @brief  This custom class can be used to override any GattServerEvents
            that you are interested in handling on an application level.
*/
/**************************************************************************/
class GattServerEventHandler : public GattServerEvents
{
    //virtual void onDataSent(uint16_t charHandle) {}
    //virtual void onDataWritten(uint16_t charHandle) {}

    virtual void onUpdatesEnabled(uint16_t charHandle)
    {
        if (charHandle == hrmRate.getHandle()) {
            pc.printf("Heart rate notify enabled\n\r");
        }
    }

    virtual void onUpdatesDisabled(uint16_t charHandle)
    {
        if (charHandle == hrmRate.getHandle()) {
            pc.printf("Heart rate notify disabled\n\r");
        }
    }

    //virtual void onConfirmationReceived(uint16_t charHandle) {}
};

/**************************************************************************/
/*!
    @brief  Program entry point
*/
/**************************************************************************/
int main(void)
{
    /* Setup blinky: led1 is toggled in main, led2 is toggled via Ticker */
    led1 = 1;
    led2 = 1;
    flipper.attach(&tickerCallback, 1.0);

    /* Setup the local GAP/GATT event handlers */
    nrf.getGap().setEventHandler(new GapEventHandler());
    nrf.getGattServer().setEventHandler(new GattServerEventHandler());

    /* Initialise the nRF51822 */
    pc.printf("Initialising the nRF51822\n\r");
    nrf.init();

    /* Make sure we get a clean start */
    nrf.reset();

    /* Add BLE-Only flag and complete service list to the advertising data */
    advData.addFlags(GapAdvertisingData::BREDR_NOT_SUPPORTED);
    advData.addData(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS,
                    (uint8_t *)uuid16_list, sizeof(uuid16_list));
    advData.addAppearance(GapAdvertisingData::HEART_RATE_SENSOR_HEART_RATE_BELT);
    nrf.getGap().setAdvertisingData(advData, scanResponse);

    /* Add the Battery Level service */
    battService.addCharacteristic(battLevel);
    nrf.getGattServer().addService(battService);

    /* Add the Device Information service */
    deviceInformationService.addCharacteristic(deviceManufacturer);
    nrf.getGattServer().addService(deviceInformationService);

    /* Add the Heart Rate service */
    hrmService.addCharacteristic(hrmRate);
    hrmService.addCharacteristic(hrmLocation);
    nrf.getGattServer().addService(hrmService);

    /* Start advertising (make sure you've added all your data first) */
    nrf.getGap().startAdvertising(advParams);

    /* Wait until we are connected to a central device before updating
     * anything */
    pc.printf("Waiting for a connection ...");
    while (!nrf.getGap().state.connected) {
    }
    pc.printf("Connected!\n\r");

    /* Now that we're live, update the battery level characteristic, and */
    /* change the device manufacturer characteristic to 'mbed' */
    nrf.getGattServer().updateValue(battLevel.getHandle(), (uint8_t *)&batt,
                                    sizeof(batt));
    nrf.getGattServer().updateValue(deviceManufacturer.getHandle(),
                                    deviceName,
                                    sizeof(deviceName));

    /* Set the heart rate monitor location (one time only) */
    /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
    uint8_t location = 0x03; /* Finger */
    uint8_t hrmCounter = 100;
    nrf.getGattServer().updateValue(hrmLocation.getHandle(),
                                    (uint8_t *)&location,
                                    sizeof(location));

    /* Do blinky on LED1 while we're waiting for BLE events */
    for (;; ) {
        led1 = !led1;
        wait(1);

        /* Update battery level */
        batt++;
        if (batt > 100) {
            batt = 72;
        }
        nrf.getGattServer().updateValue(battLevel.getHandle(),
                                        (uint8_t *)&batt,
                                        sizeof(batt));

      /* Update the HRM measurement */
      /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
      /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
        hrmCounter++;
        if (hrmCounter == 175) {
            hrmCounter = 100;
        }
        uint8_t bpm[2] = {0x00, hrmCounter};
        nrf.getGattServer().updateValue(hrmRate.getHandle(), bpm, sizeof(bpm));
    }
}

/**************************************************************************/
/*!
    @brief  Ticker callback to switch led2 state
*/
/**************************************************************************/
void tickerCallback(void)
{
    led2 = !led2;
}