#include "mbed.h"
#define Close 0
#define Open 1
#define Alarm 2

Timer timer2;
PwmOut Buzzer(p21);
DigitalOut Door_LED(LED1);
DigitalOut warning(LED4);

InterruptIn switchEvent(p8);
InterruptIn Door_Stat(p15);

int status = 0;
int timer_status = 0;


void Buzzer_ctrl(int n)
{
	if(n == 1)
		Buzzer = 0.5; // buzzer on
	else
		Buzzer = 0;  // buzzer off

}

void Alarm_off()
{
	// debouncing
	wait_ms(50);
	if(switchEvent == 0)
	{
		Buzzer_ctrl(0);
	}
}

void Door_Closed()
{
	wait_ms(50);
	if(Door_Stat == 1) //Case of hole sensor indicate 1(closed)
	{
		if(timer2.read_ms()>10000)
			status = Alarm;
		else
			status = Close;

		timer2.reset();
		timer_status = 0;
	}

}

void Door_Opened()
{
	wait_ms(50);
	if(Door_Stat == 0) //Case of hole sensor indicate 0(open)
		status = Open; // go to status Opened
	if(timer_status == 0)
	{
		timer2.start();
		timer_status = 1;
	}


}



int main()
{



	//buzzer setting
	Buzzer.period(0.010);
	Buzzer = 0;

	switchEvent.fall(Alarm_off);

	Door_Stat.fall(Door_Opened);
	Door_Stat.rise(Door_Closed);

	while (true)
	{
		if(status == Close)
		{
			Door_LED = Close;
			timer2.reset();
			timer_status = 0;
		}
		else if(status == Open)
		{
			Door_LED = Open;
			 //when the open, timer starts.
			if(timer2.read_ms()>10000)
				Buzzer_ctrl(1);
		}

		else if(status == Alarm)
		{
			Door_LED = Close;
			timer2.reset();
			timer_status = 0;
		}
		else
		{
			warning = 1;

		}


	}
}