Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear
states.h // User defined library
#ifndef STATES_H_
#define STATES_H_
#include
/*.........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_pressurised_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",{NULL,NULL}},
{"Lowering Gear","Green","Down","Enabled",{"Disabled","Enabled"}}
};
#endif /* STATES_H_ */
1) Main.c
#include
#include "States.h"
static void (*state_table[])(void) = {Gear_Down, Checking_Before_Takeoff, Raising_Gear,
Gear_Up, Checking_Before_Landing, Lowering_Gear}; //syntax
int main()
{
Init_State_Machine();
while(1)
{
state_table[current_state]();
}
}
2) Init_State_Machine.c
#include "States.h" //User defined Library
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);
}
3) Gear_Down
#include
#include "States.h"
void Gear_Down(void)
{
current_state = GR_DWN;
//printf("\nCurrent State : %s\n",State_Machine[current_state].current_state_indication);
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();
}
}
4) Checking_Before_Takeoff
#include "States.h"
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_pressurised_spring_status[hydraulic_mechanism]);
}
}
5) Raising_Gear
#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();
}
}
6) Gear_Up
#include "States.h"
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();
}
}
7) Checking_Before_Landing
#include "States.h"
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_pressurised_spring_status[hydraulic_mechanism]);
}
if(pilot_lever == (Up || Rising || Falling))
{
Checking_Before_Landing();
}
}
8) Lowering_Gear
#include
#include "States.h"
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();
}
}
RUN AS :
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:0 0 1
Wait for 2 secs