Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear
#include // header file
void Initiate_State_Machine(); // 6 diff 1state funcs
void GearDown();
void CheckingBeforeTakeOFF();
void RaisingGear();
void GearUp();
void CheckBeforeLanding();
void LoweringGear();
static void (*statetable[])(void) = {GearDown, CheckingBeforeTakeOFF, RaisingGear, GearUp, CheckBeforeLanding, LoweringGear};
typedef enum State
{
GEAR_DOWN,
CHECKING_BEFORE_TAKEOFF,
RAISING_GEAR,
GEAR_UP,
CHECK_BEFORE_LANDING,
LOWERING_GEAR,
} State_Type;
typedef enum Switch
{
on, //on = 0 as input
off // off = 1 as input ,,plane is on ground
} Switch_status;
typedef enum pilot_lever
{
Raising, //0
falling, //1
up,
down
} pilot_lever;
typedef enum hydraulic_mechanism
{
working,//1
not_working //0
} hydraulic_mechanism;
static volatile Switch_status squat_switch;
static volatile Switch_status limit_switch;
static volatile pilot_lever pl;
static volatile hydraulic_mechanism hm;
State_Type current_state;
typedef struct
{
char *current_state_indication;
char *light;
char *direction_valve_status;
char *landing_gear_hydraulic_control;
char *Gas_Pressurized_Spring_system_status[2]; //two gas pressururized,
} State_Table;
static State_Table State_Machine[6] = {{"GearDown", "Green", "Down", "Enabled", {NULL, NULL}},
{"CheckingBeforeTakeOFF", "Green", "Down", "Enabled", {NULL, NULL}},
{"RaisingGear", "Red", "Up", "Enabled", {NULL, NULL}},
{"GearUp", "Off", "NULL", "Disabled", {NULL, NULL}},
{"CheckBeforeLanding", "Red", "Down", "Enabled", {NULL, NULL}},
{"LoweringGear", "Green", "Down", "Enabled", {"Disabled", "Enabled"}}};
int main()
{
Initiate_State_Machine();
while (1)
{
statetable[current_state]();
}
}
void GearDown(void)
{
current_state = GEAR_DOWN;
printf("Please Enter the status of pilot's lever and squat switch :\n");
fflush(stdout);
scanf("%d %d",&pl, &squat_switch);
if (pl == Raising && squat_switch == on)
{
current_state = CHECKING_BEFORE_TAKEOFF;
printf("current state:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is :%s\n", State_Machine[current_state].light);
}
else
{
GearDown();
}
}
// CheckingBeforeTakeOFF
void CheckingBeforeTakeOFF(void)
{
current_state = CHECKING_BEFORE_TAKEOFF;
printf("Enter the status of pilot's lever and squat switch and hydraulic mechanism:\n");
fflush(stdout);
scanf("%d %d %d", &pl, &squat_switch, &hm);
if (pl == falling && squat_switch == off)
{
GearDown();
}
else if (pl == Raising && squat_switch == on && hm == working)
{
current_state = RAISING_GEAR;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
printf("Status of Direction valve:%s\n", State_Machine[current_state].direction_valve_status);
}
else if (pl == Raising && squat_switch == on && hm == not_working)
{
current_state = RAISING_GEAR;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
printf("Status of Direction valve:%s\n", State_Machine[current_state].direction_valve_status);
printf("Status of gas pressurised Spring System:%s\n", State_Machine[current_state].Gas_Pressurized_Spring_system_status);
}
}
// RaisingGear
void RaisingGear(void)
{
current_state = RAISING_GEAR;
printf("give the status of pilot's lever and limit switch: \n");
fflush(stdout);
scanf("%d %d", &pl, &limit_switch);
if (pl == falling && limit_switch == on)
{
current_state = CHECK_BEFORE_LANDING;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
printf("Landing Gear Hydraulic Control:%s\n", State_Machine[current_state].landing_gear_hydraulic_control);
}
else if (pl == Raising && limit_switch == off)
{
current_state = GEAR_UP;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
printf("Landing Gear Hydraulic Control:%s\n", State_Machine[current_state].landing_gear_hydraulic_control);
}
else
{
RaisingGear();
}
}
// GearUp
void GearUp(void)
{
current_state = GEAR_UP;
printf("Enter the status of pilot's lever: \n");
fflush(stdout);
scanf("%d", &pl);
if (pl == falling)
{
current_state = CHECK_BEFORE_LANDING;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
printf("Landing Gear Hydraulic Control:%s\n", State_Machine[current_state].landing_gear_hydraulic_control);
}
else
{
GearUp();
}
}
// CheckBeforeLanding
void CheckBeforeLanding(void)
{
current_state = CHECK_BEFORE_LANDING;
printf("Enter the status of pilot's lever and hydraulic mechanism status: \n");
fflush(stdout);
scanf("%d %d", &pl, &hm);
if (pl == falling && hm == working)
{
current_state = LOWERING_GEAR;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
printf("Status of Direction valve:%s\n", State_Machine[current_state].direction_valve_status);
}
else if(pl == falling && hm == not_working)
{
current_state = LOWERING_GEAR;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
printf("Status of Direction valve:%s\n", State_Machine[current_state].direction_valve_status);
printf("Status of gas pressurised Spring System:%s\n", State_Machine[current_state].Gas_Pressurized_Spring_system_status);
}
else if(pl == (Raising))
{
CheckBeforeLanding();
}
}
// LoweringGear.
void LoweringGear(void)
{
current_state = LOWERING_GEAR;
printf("Enter the status of pilot's lever and limit switch: \n");
fflush(stdout);
scanf("%d %d", &pl, &limit_switch);
if (pl == falling && limit_switch == on)
{
current_state = CHECKING_BEFORE_TAKEOFF;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
}
else if (pl == Raising && limit_switch == off)
{
current_state = GEAR_DOWN;
printf("Current State:%s\n", State_Machine[current_state].current_state_indication);
printf("Light is:%s\n", State_Machine[current_state].light);
printf("Landing Gear Hydraulic Control:%s\n", State_Machine[current_state].landing_gear_hydraulic_control);
}
if (limit_switch == off)
{
LoweringGear();
}
}
// Initiate_State_Machine
void Initiate_State_Machine()
{
current_state
= GEAR_DOWN;
printf("The Finite State Machine is Intialized and current the program is in"
"GearDown State & Light is:%s\n",
State_Machine[current_state].light);
}
Output
void Gear_Down(); 0 0
void Checking_Before_Takeoff(); 2 0 1
void Raising_Gear(); 1 2
void Gear_Up(); 1
void Checking_Before_Landing(); 3 1