Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear
AIM:- Implement the Code for controlling the retraction and extension of Airplane’s landing gear
GEAR_DOWN(0):
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
CHECKING_BEFORE_TAKING OFF(1):
Enter the Pilot's Lever Position,Squat Switch Status and Hydraulic Mechanism Status:2 0 0
Wait for 2 secs
Current State: Raising Gear
Light Status:Red
Direction Value Status:Up
RISING_GEAR(2):
Enter the Limit Switch Status, Pilot's Lever Position :1 2
Wait for 1 sec
Current State: Gear Up
Light Status:Off
Hydraulic Control for Landing Gear Status:Disabled
GEAR_UP(3):
Enter the Pilot's Lever Position:1
Current State:Checking Before Landing
Light Status:Red
Hydraulic Control for Landing Gear Status:Enabled
CHECKING_BEFORE_LANDING(4):
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
LOWRING_GEAR(5):
Enter the Limit_Switch Status,Pilot_Lever Status ::1 0
Current State: Checking Before Take Off
Light Status:Green
CONDITIONS:-
PROGRAM:-
#include<stdlib.h>
typedef enum States
{
Gear_down,
Checking_before_Take_off,
Raising_Gear,
Gear_Up,
Checking_before_Landing,
Lowering_Gear
}State_Type;
typedef enum switches
{
Open,
Close
}Switch;
typedef enum pilot
{
Rising,
Falling,
Up,
Down,
}Pilot_Lever;
typedef enum Hydraulic
{
Working,
Not_Working
}Hydraulic_Mechanism;
static volatile Switch limit;
static volatile Switch squat;
static volatile Pilot_Lever a;
static volatile Hydraulic_Mechanism b;
State_Type current_state;
typedef struct
{
char* next_state;
char* light;
char* direction_valve;
char* hydraulic_control;
}position;
void gear_down();
void checking_before_take_off();
void raising_gear();
void gear_up();
void checking_before_landing();
void lowering_gear();
static
void(*position[])(void)={gear_down,
checking_before_take_off,
raising_gear,
gear_up,
checking_before_landing,
lowering_gear
};
static position state_machine[6]={{"GEAR DOWN","GREEN","DOWN","ENABLED"},
{"CHECKING BEFORE TAKEOFF","GREEN","DOWN","ENABLED"},
{"RAISING GEAR","RED","UP","ENABLED"},
{"GEAR UP","OFF","NULL","DISABLED"},
{"CHECKING BEFORE LANDING","RED","DOWN","ENABLED"},
{"LOWERING GEAR","GREEN","DOWN","ENABLED"}
};
int main()
{
current_state=Gear_down;
while(1)
{
position[current_state]();
}
}
void gear_down()
{
current_state=Gear_down;
scanf("%d %d",&a,&squat);
if((a==Rising)&&(squat==Open))
{
current_state=Checking_before_Take_off;
printf("Next state is %s\n",state_machine[current_state].next_state);
printf("Light is %s\n",state_machine[current_state].light);
printf("Direction valve is %s\n",state_machine[current_state].direction_valve);
printf("Hydraulic control is
%s\n",state_machine[current_state].hydraulic_control);
}
else
{
gear_down();
}}
void checking_before_take_off()
{
current_state=Checking_before_Take_off;
scanf("%d %d %d",&a,&squat,&b);
if((a==Falling)||(squat==Close))
{
current_state=Gear_down;
printf("Next state is %s\n",state_machine[current_state].next_state);
printf("Light is %s\n",state_machine[current_state].light);
printf("Direction valve is %s\n",state_machine[current_state].direction_valve);
printf("Hydraulic control is
%s\n",state_machine[current_state].hydraulic_control);
}
else if((a==Up)&&(b==Working))
{
current_state=Raising_Gear;
printf("Next state is %s\n",state_machine[current_state].next_state);
printf("Light is %s\n",state_machine[current_state].light);
printf("Direction valve is %s\n",state_machine[current_state].direction_valve);
printf("Hydraulic control is
%s\n",state_machine[current_state].hydraulic_control);
}
else
{
checking_before_take_off();
}
}
void raising_gear()
{
current_state=Raising_Gear;
scanf("%d %d",&a,&limit);
if(a==Falling)
{
current_state=Checking_before_Landing;
printf("Next state is %s\n",state_machine[current_state].next_state);
printf("Light is %s\n",state_machine[current_state].light);
printf("Direction valve is %s\n",state_machine[current_state].direction_valve);
printf("Hydraulic control is %s\n",state_machine[current_state].hydraulic_control);
}
else if(limit==Close)
{
current_state=Gear_Up;
printf("Next state is %s\n",state_machine[current_state].next_state);
printf("Light is %s\n",state_machine[current_state].light);
printf("Direction valve is %s\n",state_machine[current_state].direction_valve);
printf("Hydraulic control is %s\n",state_machine[current_state].hydraulic_control);
}
}
void gear_up()
{
current_state=Gear_Up;
scanf("%d",&a);
if(a==Falling)
{
current_state=Checking_before_Landing;
}
else
{
gear_up();
}
}
void checking_before_landing()
{
current_state=Checking_before_Landing;
scanf("%d %d",&a,&b);
if(a==Down||b==Not_Working)
{
current_state=Lowering_Gear;
}
else
{
checking_before_landing();
}
}
void lowering_gear()
{
current_state=Lowering_Gear;
scanf("%d %d",&limit,&a);
if(limit==Open)
{
current_state= Gear_down;
}
else if(a==Rising)
{
current_state=Checking_before_Take_off;
}
else
{
lowering_gear();
}
}