Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear
// Karthick Raj K /embd offline
//project 2
#include <stdio.h> 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 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; 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"}} }; void Lowering_Gear() { current_state = LWRNG_GR; //printf("\ncurrent State:%s\n,State_Machine[current_state].current_state_indication); printf("\n Enter the limit Switch Status,pilot's lever Position"); fflush(stdout); scanf("%d%d",&pilot_lever, &limit_switch); if(limit_switch == Close && pilot_lever == Rising ) { current_state=CHK_BFR_TKFF; printf("\n Current State:%s\n",State_Machine[current_state].current_state_indication); printf("\nLight Status: %s",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("\nLight Status: %s",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(); } } void Checking_Before_Takeoff() { current_state = CHK_BFR_TKFF; //printf("\nCurrent State:%s\n,State_Machine[current_state],current_state_indication); printf("\n Enter 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("\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) { current_state=RSING_GR; printf("\n Current State:%s\n",State_Machine[current_state].current_state_indication); printf("\nLight Status: %s",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) {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]); } } void Checking_Before_Landing() { current_state = CHK_BFR_LND; //printf("\nCurrent State:%s\n,State_Machine[current_state].current_state_indication); printf("\n Enter the Pilot's Lever Position and Hydraulic Mechanism Status:"); fflush(stdout); scanf("%d %d",&pilot_lever, &hydraulic_mechanism); if(pilot_lever == DOWN && hydraulic_mechanism == Working) { current_state = LWRNG_GR; printf("\n Current State:%s\n",State_Machine[current_state].current_state_indication); printf("\nLight State: %s",State_Machine[current_state].light_status); printf("Direction Valve Status:%s\n\n",State_Machine[current_state].direction_valve_status); } else if(pilot_lever== DOWN && hydraulic_mechanism == Malfunctioning) { current_state = LWRNG_GR; printf("\n Current State:%s\n",State_Machine[current_state].current_state_indication); printf("\nLight Status: %s",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(); } } void Raising_Gear() { current_state = RSING_GR; //printf("\nCurrent State:%s\n,State_Machine[current_state].current_state_indication); printf("\n Enter the Limit Switch Status,Pilots Lever 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("\n Current State:%s\n",State_Machine[current_state].current_state_indication); printf("\nLight State: %s",State_Machine[current_state].light_status); printf("Hydraulic Control for Landing Gear State:%s\n\n",State_Machine[current_state].hydraulic_pump_control_status); } else if(limit_switch == Close && pilot_lever == UP) { current_state=GR_UP; printf("\n Current State:%s\n",State_Machine[current_state].current_state_indication); printf("\n Light State: %s",State_Machine[current_state].light_status); printf("\n Hydraulic Control for landing Gear Status:%s\n",State_Machine[current_state].hydraulic_pump_control_status); } else { Raising_Gear(); } } void Gear_Down(void) { current_state = GR_DWN; //printf("\nCurrent State:%s\n,State_Machine[current_state],current_state_indication); printf("\n Enter the pilot's Lever Position, 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("\n Current State:%s\n",State_Machine[current_state].current_state_indication); printf("\nLight State: %s",State_Machine[current_state].light_status); } else { Gear_Down(); } } void Init_State_Machine() { //system initialised and its in state_A current_state = GR_DWN; printf("\n State Machine is initialized & Program is in Gear_Down_state & Light_Status:%s\n",State_Machine[current_state].light_status); } void Gear_Up() { current_state = GR_UP; //printf("\nCurrent State:%s\n,State_Machine[current_state].current state_indication); printf("\n Enter the Pilot's lever Position "); fflush(stdout); scanf("%d",&pilot_lever); if(pilot_lever == Falling) { current_state=CHK_BFR_LND; printf("\n Current State:%s\n",State_Machine[current_state].current_state_indication); printf("\nLight Status: %s",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(); } } 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](); } }