Bluetooth Low Energy / Mbed 2 deprecated BLE_Button

A template for applications where some small amount of data needs to be notified to a phone app over BLE. It is a good starting point for notifications.

Dependencies:   BLE_API mbed nRF51822

Demo for an Input Service

To help you create your own BLE services, we've created a series of service templates. The *input service template* demonstrates the use of a simple input (boolean values) from a read-only characteristic.

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-only, boolean, with notifications. This characteristic is updated according to the button's state.

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

main.cpp

Committer:
rgrover1
Date:
2015-09-29
Revision:
8:a7ba7aaba460
Parent:
6:18d8750f39ee
Child:
9:0f6951db24f1

File content as of revision 8:a7ba7aaba460:

/* 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 "BLE.h"
#include "ButtonService.h"

BLE         ble;
DigitalOut  led1(LED1);
InterruptIn button(BUTTON1);

const static char     DEVICE_NAME[] = "Button";
static const uint16_t uuid16_list[] = {ButtonService::BUTTON_SERVICE_UUID};

ButtonService *buttonServicePtr;

void buttonPressedCallback(void)
{
    buttonServicePtr->updateButtonState(true);
}

void buttonReleasedCallback(void)
{
    buttonServicePtr->updateButtonState(false);
}

void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
{
    ble.gap().startAdvertising();
}

void periodicCallback(void)
{
    led1 = !led1; /* Do blinky on LED1 to indicate system aliveness. */
}

int main(void)
{
    led1 = 1;
    Ticker ticker;
    ticker.attach(periodicCallback, 1);
    button.fall(buttonPressedCallback);
    button.rise(buttonReleasedCallback);

    ble.init();
    ble.gap().onDisconnection(disconnectionCallback);

    ButtonService buttonService(ble, false /* initial value for button pressed */);
    buttonServicePtr = &buttonService;

    /* setup advertising */
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.gap().setAdvertisingInterval(1000); /* 1000ms. */
    ble.gap().startAdvertising();

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