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Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear

VVimalraj V23 Jan 2023

Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear

/*
 * main.c
 *
 *  Created on: 18-Jan-2023
 *      Author: vvima
 */
#include
#include "States.h"

static void (*state_table[])(void) = {Gear_Down, Checking_Before_Takeoff, Raising_Gear,
									Gear_Up, Checking_Before_Landing, Lowering_Gear};
int main()

{
	Init_State_Machine();
	while(1)
	{
		state_table[current_state]();
	}
}



/*
 * states.h
 *
 *  Created on: 18-Jan-2023
 *      Author: vvima
 */

#ifndef STATES_H_
#define STATES_H_

/* -----Functions----- */
void Init_State_Machine();
void Gear_Down();
void Checking_Before_Takeoff();
void Raising_Gear();
void Gear_Up();
void Checking_Before_Landing();
void Lowering_Gear();

typedef enum State
{

	GR_DWN,
	CHK_BFR_TKFF,
	RSING_GR,
	GR_UP,
	CHK_BFR_LND,
	LWRNG_GR

}State_Type;

typedef enum Switch
{

	Open,
	Close//Plane is in ground

}Switch_Status;

typedef enum Pilot_Lever
{

	Rising,
	Falling,
	UP,
	DOWN

}Pilot_Lever_Status;

typedef enum Hydraulic_Mechanism
{

	Working,
	Malfunctioning

}Hydraulic_Mechanism_Status;

/* -----input for changing the State----- */
static volatile Switch_Status squat_switch;
static volatile Switch_Status limit_switch;
static volatile Pilot_Lever_Status pilot_lever;
static volatile Hydraulic_Mechanism_Status hydraulic_mechanism;


State_Type current_state;

typedef struct
{
	char* current_state_indication;
	char* light_status;
	char* direction_valve_status;
	char* hydraulic_pump_control_status;
	char* gas_pressurized_spring_status[2];
}State_Table;

static State_Table State_Machine[6] = {
		{"Gear Down","Green","Down","Enabled",{0,0}},
				{"Checking Before Take Off","Green","Down","Enabled",{0,0}},
				{"Raising Gear","Red","Up","Enabled",{"Disabled","Enabled"}},
				{"Gear Up","Off","Null","Disabled",{0,0}},
				{"Checking Before Landing","Red","Down","Enabled",{0,0}},
				{"Lowering Gear","Green","Down","Enabled",{"Disabled","Enabled"}}
};



#endif /* STATES_H_ */

/*
 * Init_state_machine.c
 *
 *  Created on: 18-Jan-2023
 *      Author: vvima
 */

#include "states.h"
#include
void Init_State_Machine()
{
	//System Initialized and its in State_A
	current_state = GR_DWN;
	printf("\nState Machine is initialized & Program is in Gear_Down State & Light Status : %s\n"
			,State_Machine[current_state].light_status);
}


/*
 * Gear_Down.c
 *
 *  Created on: 18-Jan-2023
 *      Author: vvima
 */
#include
#include "states.h"

void Gear_Down(void)
{
	current_state = GR_DWN;
	printf("\nEnter the Pilot's Lever Position and Squat Switch Status:");
	fflush(stdout);
	scanf("%d %d",&pilot_lever,&squat_switch);
	if(pilot_lever == Rising && squat_switch == Open)
	{
		current_state = CHK_BFR_TKFF;
		printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
		printf("Light Status:%s\n",State_Machine[current_state].light_status);
	}
	else
	{
		Gear_Down();
	}

}


/*
 * Chk_bfr_Takeoff.c
 *
 *  Created on: 18-Jan-2023
 *      Author: vvima
 */
#include "states.h"
#include

void Checking_Before_Takeoff()
{
	current_state = CHK_BFR_TKFF;
	//printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
		printf("\nEnter the Pilot's Lever Position,Squat Switch Status and Hydraulic Mechanism Status:");
		fflush(stdout);
		scanf("%d %d %d",&pilot_lever,&squat_switch,&hydraulic_mechanism);
		printf("\nWait for 2 secs\n");
		if(pilot_lever == Falling || squat_switch == Close)
		{
			Gear_Down();
		}

		else if(pilot_lever == UP && squat_switch == Open && hydraulic_mechanism == Working)
		{
			current_state = RSING_GR;
			printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
			printf("Light Status:%s\n",State_Machine[current_state].light_status);
			printf("Direction Valve Status:%s\n\n",State_Machine[current_state].direction_valve_status);
		}

		else if(pilot_lever == UP && squat_switch == Open && hydraulic_mechanism == Malfunctioning)
		{
			current_state = RSING_GR;
			printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
			printf("Light Status:%s\n",State_Machine[current_state].light_status);
			printf("Direction Valve Status:%s\n",State_Machine[current_state].direction_valve_status);
			printf("Gas Pressurized Spring System Status:%s\n",State_Machine[current_state].gas_pressurized_spring_status[hydraulic_mechanism]);
		}
}

/*
 * Raising_gear.c
 *
 *  Created on: 19-Jan-2023
 *      Author: vvima
 */
#include
#include "States.h"

void Raising_Gear()
{
	current_state = RSING_GR;
	//printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
	printf("\nEnter the Limit Switch Status,Pilots Leaver Status:");
	fflush(stdout);
	scanf("%d %d",&limit_switch,&pilot_lever);
	printf("\nWait for 1 sec\n");
	if(pilot_lever == Falling && limit_switch == Open)
	{
		current_state = CHK_BFR_LND;
		printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
		printf("Light Status:%s\n",State_Machine[current_state].light_status);
		printf("Hydraulic Control for Landing Gear Status:%s\n",State_Machine[current_state].hydraulic_pump_control_status);

	}
	else if(limit_switch == Close && pilot_lever == UP)
	{
		current_state = GR_UP;
		printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
		printf("Light Status:%s\n",State_Machine[current_state].light_status);
		printf("Hydraulic Control for Landing Gear Status:%s\n",State_Machine[current_state].hydraulic_pump_control_status);
	}

	else
	{
		Raising_Gear();
	}
}

/*
 * Gear_up.c
 *
 *  Created on: 19-Jan-2023
 *      Author: vvima
 */
#include "states.h"
#include

void Gear_Up()
{
	current_state = GR_UP;
		//printf("Current State : %s\n",State_Machine[current_state].current_state_indication);
		printf("\nEnter the Pilot's Lever Position:");
		fflush(stdout);
		scanf("%d",&pilot_lever);
		if(pilot_lever == Falling)
		{
			current_state = CHK_BFR_LND;
			printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
			printf("Light Status:%s\n",State_Machine[current_state].light_status);
			printf("Hydraulic Control for Landing Gear Status:%s\n",State_Machine[current_state].hydraulic_pump_control_status);
		}
		else
		{
			Gear_Up();
		}
}

/*
 * Chk_bfr_landing.c
 *
 *  Created on: 19-Jan-2023
 *      Author: vvima
 */
#include "states.h"
#include

void Checking_Before_Landing()
{
	current_state = CHK_BFR_LND;
		//printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
		printf("\nEnter the Pilot's Lever Position and Status of Hydraulic Mechanism:");
		fflush(stdout);
		scanf("%d %d",&pilot_lever,&hydraulic_mechanism);
		if(pilot_lever == DOWN && hydraulic_mechanism == Working)
		{
			current_state = LWRNG_GR;
			printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
			printf("Light Status:%s\n",State_Machine[current_state].light_status);
			printf("Direction Valve Status:%s\n",State_Machine[current_state].direction_valve_status);
		}
		else if(pilot_lever == DOWN && hydraulic_mechanism == Malfunctioning)
		{
			current_state = LWRNG_GR;
			printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
			printf("Light Status:%s\n",State_Machine[current_state].light_status);
			printf("Direction Valve Status:%s\n",State_Machine[current_state].direction_valve_status);
			printf("Gas Pressurized Spring System Status:%s\n",State_Machine[current_state].gas_pressurized_spring_status[hydraulic_mechanism]);
		}

		 if(pilot_lever == (UP || Rising || Falling))
		{
				Checking_Before_Landing();
		}

}


/*
 * lowering_gear.c
 *
 *  Created on: 19-Jan-2023
 *      Author: vvima
 */
#include "states.h"
#include

void Lowering_Gear()
{
	current_state = LWRNG_GR;
	//printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
	printf("\nEnter the Limit Switch Status,Pilots Leaver Status::");
	fflush(stdout);
	scanf("%d %d",&limit_switch,&pilot_lever);
	if( limit_switch == Close && pilot_lever == Rising )
		{
		current_state = CHK_BFR_TKFF;
		printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
		printf("Light Status:%s\n",State_Machine[current_state].light_status);
		}
	if(limit_switch == Open && pilot_lever == DOWN)
	{
		current_state = GR_DWN;
		printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
		printf("Light Status:%s\n",State_Machine[current_state].light_status);
		printf("Hydraulic Control for Landing Gear Status:%s\n",State_Machine[current_state].hydraulic_pump_control_status);
	}

	else
	{
		Lowering_Gear();
	}
}

OutPut:

State Machine is initialized & Program is in Gear_Down State & Light Status : Green

Enter the Pilot's Lever Position and Squat Switch Status:0 0

Current State : Checking Before Take Off
Light Status:Green

Enter the Pilot's Lever Position,Squat Switch Status and Hydraulic Mechanism Status:2 0 1

Wait for 2 secs

Current State : Raising Gear
Light Status:Red
Direction Valve Status:Up
Gas Pressurized Spring System Status:Enabled

Enter the Limit Switch Status,Pilots Leaver Status:1 2

Wait for 1 sec

Current State : Gear Up
Light Status:Off
Hydraulic Control for Landing Gear Status:Disabled

Enter the Pilot's Lever Position:1

Current State : Checking Before Landing
Light Status:Red
Hydraulic Control for Landing Gear Status:Enabled

Enter the Pilot's Lever Position and Status of Hydraulic Mechanism:3 1

Current State : Lowering Gear
Light Status:Green
Direction Valve Status:Down
Gas Pressurized Spring System Status:Enabled

Enter the Limit Switch Status,Pilots Leaver Status::
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