An example of creating and updating a simple GATT Service using the BLE_API
Dependencies: BLE_API mbed nRF51822 X_NUCLEO_IDB0XA1
This example creates and updates a standard Battery Level service, and a single GATT characteristic that contains the battery level.
main.cpp
- Committer:
- rgrover1
- Date:
- 2014-09-22
- Revision:
- 8:45beed07b093
- Parent:
- 5:77ad8d8dc9c5
- Child:
- 12:4024aa3f72b0
File content as of revision 8:45beed07b093:
/* 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 "BatteryService.h" BLEDevice ble; DigitalOut led1(LED1); #define NEED_CONSOLE_OUTPUT 0 /* Set this if you need debug messages on the console; * it will have an impact on code-size and power * consumption. */ #if NEED_CONSOLE_OUTPUT Serial pc(USBTX, USBRX); #define DEBUG(...) { pc.printf(__VA_ARGS__); } #else #define DEBUG(...) /* nothing */ #endif /* #if NEED_CONSOLE_OUTPUT */ BatteryService *batteryServicePtr = NULL; void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason) { DEBUG("Disconnected handle %u!\n\r", handle); DEBUG("Restarting the advertising process\n\r"); ble.startAdvertising(); } /** * Runs once a second in interrupt context triggered by the 'ticker'; updates * battery level if there is a connection. */ void periodicCallback(void) { led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */ if (ble.getGapState().connected) { /* Update battery level */ static uint8_t batt = 50; batt++; if (batt > 100) { batt = 72; } batteryServicePtr->updateBatteryLevel(batt); } } int main(void) { led1 = 1; Ticker ticker; ticker.attach(periodicCallback, 1); DEBUG("Initialising the nRF51822\n\r"); ble.init(); ble.onDisconnection(disconnectionCallback); /* setup advertising */ ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED); ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); ble.setAdvertisingInterval(160); /* 100ms; in multiples of 0.625ms. */ ble.startAdvertising(); BatteryService batterService(ble); batteryServicePtr = &batterService; while (true) { ble.waitForEvent(); } }