Diff: main.cpp

Revision:

0:f23a00038055

--- /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();
+
+    }
+}
+
+