Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear
#include <stdio.h> //header file
void Init_State_machine(); //prototype function delcarartion void is used to function return type//
void Gear_Down();
void Checking_Before_Takeoff();
void Raising_Gear();
void Gear_Up();
void Checking_Before_Landing();
void Lowering_Gear();
typedef enum State //typedef means keeping alias name
{
GR_DWN, //all possible states using enum to give enumerated value
CHK_BFR_TKFF,
RSING_GR,
GR_UP,
CHK_BFR_LND,
LWRNG_GR
}State_Type;
typedef enum Switch
{
Open, //switch we can use same enum for two switch further
Close
}Switch_Status;
typedef enum Pilot_Lever
{
Rising,
Falling, //here calling the different pilot_lever
UP,
DOWN
}Pilot_Lever_Status;
typedef enum Hydraulic_Mechanism
{
Working,
Malfunctioning //the different hydraulic_ machanism which is only disable when plane is in air
}Hydraulic_Mechanism_Status;
static volatile Switch_Status squat_switch; // there are four variable which are use to define conditions
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; //calling the status of the struct
char* light_Status;
char* direction_value_status;
char* hydraulic_pump_control_status;
char* gas_pressurized_spring_status[2];
}State_Table;
//array of structure state table
static State_Table State_Machine[6] = {
{"GearDown","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"}}
};
//we are here giving address of all functions to fuction pointer
//and we call the function passing arguments as an array
static void (*state_table[])(void) = {Gear_Down,Checking_Before_Takeoff,Raising_Gear,
Gear_Up,Checking_Before_Landing,Lowering_Gear};
//main function
int main()
{
Init_State_Machine(); //while loop start hear//
while(1)
{
state_table[current_state]();
}
}
void Init_State_Machine() //function declaration
{
current_state = GR_DWN; //In GEAR_DOWN light =GREEN
printf("\nState Machine is initialized & Program is in Gear_Down State & Light_Status : %s\n",State_Machine[current_state].light_Status);
}
void Gear_Down(void) //function delcaration
{
current_state = GR_DWN;
printf("\n Enter 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) //GEAR_down =rising -(0) and open-(0)//
{
current_state = CHK_BFR_TKFF;
printf("\n Current State:%s\n",State_Machine[current_state].current_state_indication);
printf("Light Status:%s\n",State_Machine[current_state].light_Status);
}
else
{
Gear_Down();
}
}
void Checking_Before_Takeoff()//function declarartion//
{
current_state = CHK_BFR_TKFF;
printf("\n Enter the Pilot's Lever Position,Squat Switch Status and Hydraulic Mechanism Status:");//console//
fflush(stdout);
scanf("%d %d %d",&pilot_lever,&squat_switch,&hydraulic_mechanism);//reads the address//
printf("\n Wait for 2 secs\n");
if(pilot_lever == Falling || squat_switch == Close)
{
Gear_Down();
}
else if (pilot_lever == UP && squat_switch == Open && hydraulic_mechanism == Working)
{ //chk_bfr_tkf= up(2),squat_switch=(0) and working=(0)
current_state = RSING_GR;
printf("\n Current State: %s\n",State_Machine[current_state].current_state_indication);
printf("Light Status:%s\n",State_Machine[current_state].light_Status);
printf("Direction Value Status:%s\n\n",State_Machine[current_state].direction_value_status);
}
else if (pilot_lever == UP && squat_switch == Open && hydraulic_mechanism == Malfunctioning)
{ //chk_bfr_tkf= up(2),squat_switch=(0) and working=(1)
printf("Light Status:%s\n",State_Machine[current_state].light_Status);
printf("Direction Value Status:%s\n",State_Machine[current_state].direction_value_status);
printf("Gas Pressurized Spring System Status:%s\n",State_Machine[current_state].gas_pressurized_spring_status[hydraulic_mechanism]);
}
}
void Raising_Gear() //function declarartion//
{
current_state = RSING_GR;
printf("\n Enter the Limit Switch Status, Pilot's Lever Position :");// enter the console of t limt switch and pilot lever posistions//
fflush(stdout);
scanf("%d %d",&pilot_lever,&limit_switch);
printf("\nWait for 1 sec\n");
if(pilot_lever == Falling && limit_switch == Open) //if statment will starts
{
current_state = CHK_BFR_LND;
printf ("\n Current 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 (pilot_lever == UP && limit_switch == Close) //chk_bfr_lnd= close(1) and pilot_lever =(2)
{
current_state = GR_UP;
printf ("\n Current 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();
}
}
void Gear_Up() //function declaration//
{
current_state = GR_UP;
printf("\n Enter the Pilot's Lever Position:"); //enter the cosole pilot lever position
fflush(stdout);
scanf("%d",&pilot_lever);
if(pilot_lever ==Falling) // if statement will starts pilot_lever == falling means "1"
{
current_state = CHK_BFR_LND;
printf("\n Current 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();
}
}
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:"); // print the console//
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_value_status);
}
else if(pilot_lever == DOWN && hydraulic_mechanism == Malfunctioning) // pilot_ lever= down(3)and hydr_mech=malfun(1)
{
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_value_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();
}
}
void Lowering_Gear() //function declarartion//
{
current_state = LWRNG_GR;
printf("\n Enter the Limit_Switch Status,Pilot_Lever Status ::"); //enter the console
fflush(stdout);
scanf("%d %d",&limit_switch,&pilot_lever);
if( limit_switch == Close && pilot_lever == Rising) // limit_switch =close(1) and pilot__ lever=rising(0)
{
current_state = CHK_BFR_TKFF;
printf("\n Current 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 ("\n Current 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();
}
}