Seat sensor first upload wokring 07092016
Dependencies: BLE_API mbed nRF51822
Diff: main.cpp
- Revision:
- 0:f23a00038055
diff -r 000000000000 -r f23a00038055 main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Wed Sep 07 15:08:48 2016 +0000 @@ -0,0 +1,191 @@ +/* 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/BLE.h" +#include "ButtonService.h" + +Serial pc(USBTX, USBRX); +DigitalOut led1(LED1); //sets led1 to digital out for connection status indicator +DigitalOut led2(LED2); //sets led1 to digital out for seat status indicator +InterruptIn button(P0_7); //sets Pin 7 to an interrupt enabled input for chair status updating + +const static char DEVICE_NAME[] = "Seat Sensor"; //specifies name of the device to be found +static const uint16_t uuid16_list[] = {ButtonService::BUTTON_SERVICE_UUID}; + +Ticker ticker; //defines a ticker for periodic callback for connection indicator +Timer debounceTimer; //defines a timer for the debouncing loop +int pin = P0_7; +BLE ble; + +enum { //an enumerator defining the three possible output states. Chair empty(RELEASED) =0. Chair OCCUPIED(PRESSED) = 1. Chair default(IDLE) = 2. + RELEASED = 0, + PRESSED, + IDLE +}; + +static uint8_t buttonState = IDLE; //initialised buttonState(Chair state) to the default(IDLE) +static ButtonService *buttonServicePtr; + +/*function is called from the ISR when the chair becomes occupied, resetting the debounce timer and changing button state*/ +void buttonPressedCallback(void) +{ + + debounceTimer.reset(); + buttonState = PRESSED; + +} +/*function is called from the ISR when the chair becomes empty, resetting the debounce timer and changing button state*/ +void buttonReleasedCallback(void) +{ + + debounceTimer.reset(); + buttonState = RELEASED; + +} + + +/* upon disconnecting advertising process is repeated */ +void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params) +{ + + BLE::Instance().gap().startAdvertising(); + +} + +/* on connection state is outputted updating firefly */ +void connectionCallback(const Gap::ConnectionCallbackParams_t *params) +{ + + // buttonServicePtr->updateButtonState(button.read()); + + +} + +/* periodic callback for indicating state of the board */ +void periodicCallback(void) +{ + if(ble.getGapState().connected == 0) { + led1=!led1; + } else { + led1= 1; + } + +} + +/** + * This function is called when the ble initialization process has failled + */ +void onBleInitError(BLE &ble, ble_error_t error) +{ + /* Initialization error handling should go here */ +} + +/** + * Callback triggered when the ble initialization process has finished + */ +void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) +{ + BLE& ble = params->ble; + ble_error_t error = params->error; + + if (error != BLE_ERROR_NONE) { + /* In case of error, forward the error handling to onBleInitError */ + onBleInitError(ble, error); + return; + } + + + /* Ensure that it is the default instance of BLE */ + if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) { + return; + } + + ble.gap().onDisconnection(disconnectionCallback); + ble.gap().onConnection(connectionCallback); + + /* Setup primary service */ + buttonServicePtr = new ButtonService(ble, false /* initial value for button pressed */); + + /* 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(); + +} + +int main(void) +{ + + debounceTimer.start(); //initialises the debounce timer + ticker.attach(periodicCallback, 1); // periodic ticker indicating the board it setup and running + button.fall(buttonPressedCallback); //interrupt call for chair occupied + button.rise(buttonReleasedCallback);//interrupt call for chair empty + + BLE &ble = BLE::Instance(); + ble.init(bleInitComplete); + + + while (ble.hasInitialized() == false) + { + /* spin loop */ + } + + /* updates state to the firefly upon mbed board booting */ + if (button.read() == 1) { + buttonServicePtr->updateButtonState(1); + led2 = !button.read(); + } else { + buttonServicePtr->updateButtonState(0); + led2 = !button.read(); + } + + /*main while loop*/ + while (true) { + + /*this is the debouncing loop, debounce only occurs upon state change from occupied + to empty so as to detect and ignore temporary shifting in the occupants position causing the system to believe the state has changed */ + + while(buttonState != IDLE) + { + if((buttonState == PRESSED)&&(debounceTimer.read_ms() > 200)) + { + + led2=buttonState; + buttonServicePtr->updateButtonState(buttonState); + buttonState = IDLE; + + } + + else if ((buttonState == RELEASED) && (debounceTimer.read_ms()>2000)) //debounce timer set to 2 seconds, can be adjusted for more realtime or reliable updates + { + + led2=buttonState; + buttonServicePtr->updateButtonState(buttonState); + buttonState = IDLE; + + } + } + + ble.waitForEvent(); + + } +} + +