Bluetooth Low Energy / Mbed 2 deprecated BLE_LED

template for an actuator service

Dependencies:   BLE_API mbed nRF51822

Demo for an Actuator Service

To help you create your own BLE services, we've created a series of service templates. The *actuator service template* demonstrates the use of a read-write characteristic to control a LED through a phone app.

The template covers:

1. Setting up advertising and connection states.

2. Assigning UUIDs to the service and its characteristic.

3. Creating an input characteristic: read-write, boolean. This characteristic offers control of the LED.

4. Constructing a service class and adding it to the BLE stack.

main.cpp

Committer:
rgrover1
Date:
2015-06-08
Revision:
4:16e8c289c99e
Parent:
1:a84c3717aa5e
Child:
6:fca54d71d10e

File content as of revision 4:16e8c289c99e:

/* 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 "LEDService.h"

BLEDevice  ble;
DigitalOut alivenessLED(LED1);
DigitalOut actuatedLED(LED2);

const static char     DEVICE_NAME[] = "LED";
static const uint16_t uuid16_list[] = {LEDService::LED_SERVICE_UUID};

LEDService *ledServicePtr;

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

void periodicCallback(void)
{
    //alivenessLED = !alivenessLED; /* Do blinky on LED1 to indicate system aliveness. */
}

/**
 * This callback allows the LEDService to receive updates to the ledState Characteristic.
 *
 * @param[in] params
 *     Information about the characterisitc being updated.
 */
void onDataWrittenCallback(const GattCharacteristicWriteCBParams *params) {
    if ((params->charHandle == ledServicePtr->getValueHandle()) && (params->len == 1)) {
        actuatedLED = *(params->data);
    }
}

int main(void)
{
    alivenessLED = 0;
    actuatedLED  = 0;

    Ticker ticker;
    ticker.attach(periodicCallback, 1);

    ble.init();
    ble.onDisconnection(disconnectionCallback);
    ble.onDataWritten(onDataWrittenCallback);

    bool initialValueForLEDCharacteristic = false;
    LEDService ledService(ble, initialValueForLEDCharacteristic);
    ledServicePtr = &ledService;

    /* 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::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.setAdvertisingInterval(1000); /* 1000ms. */
    ble.startAdvertising();

    while (true) {
        ble.waitForEvent();
    }
}