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/*
* Copyright (C) 2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
.text
/* Main function of the elevator control.
* This function will be called whenever an input port changes.
*/
.globl elevator_control_main
elevator_control_main:
call elevator_set_direction
cmpb $0, elevator_door_phase
jne _elevator_button_functions
call elevator_move
call elevator_set_floor
_elevator_button_functions:
call elevator_update_floor_led
call elevator_update_button_lights
ret
/* This callback function should close the door again.
* It should get called via time_call_after, after the
* door was opened and 5 seconds have passed.
*/
elevator_door_timer_done:
ret
/* This function should update the 8 Segment LED with the current
* position that the elevator is in (found in elevator_floor
* variable)
*/
.globl elevator_update_floor_led
elevator_update_floor_led:
ret
/* This function should check, if the elevator has reached a
* floor and should update the elevator_floor variable
* accordingly.
* You can use the "cabin position sensor floor X" to check if the
* elevator is at a floor position.
*/
.globl elevator_set_floor
elevator_set_floor:
ret
/* This function should update the button lights after one button
* was pressed.
*/
elevator_update_button_lights:
ret
/* calculate the destination bitmask and return it in variable %al.
* The destination bitmask should have the following content:
* Bit pos.: 87654321.
* Content: 0000021E
* 0: set to 0.
* 2: bit set, if either second floor call button or 2nd floor destination
* button was pressed.
* 1: bit set, if either first floor downwards call button, or first floor
* upwards call button, or first floor destination button was pressed.
* E: bit set, if either ground floor call button, or ground floor destination
* button was pressed.
*/
.globl elevator_destination_bitmask
elevator_destination_bitmask:
ret
/* This function should set the direction indicators lights based on
* the requested destination. In case the elevator could move
* both upwards and downwards, the direction the elevator has
* at the moment should be kept.
* Also, the variable elevator_direction should be set to a value
* indicating the direction, which you can use later on again.
* Choose sane values for this.
*/
elevator_set_direction:
ret
/* This function should turn on the motor if
* - the doors are closed and
* - the elevator can move to a target.
* It should also set the direction flag of the elevator.
* As a safety mechanism, it should force the motor off,
* in case any door is open.
*/
elevator_move:
ret
/* This function should turn off the destination button
* lights.
*/
elevator_turnoff_destination_lights:
ret
/* This function should turn off the call lights. */
elevator_turnoff_call_lights:
ret
/* This function should stop the elevator, if it has reached a
* destination level and should open the door.
* It should also turn off the corresponding
* lights on the buttons, both inside and outside the elevator.
* Finally, it should set up a callback handler that is called after 5
* seconds which will close the door again. Use time_call_after to do
* this (edx: pointer to callback, eax number of seconds after which the
* callback is called).
*/
elevator_open_door:
ret
.data
/* floor, the elevator is currently in.
* 0=Ground floor, 1=1st floor, 2=2nd floor */
.globl elevator_floor
elevator_floor:
.byte 0
/* direction of elevator. Define contents to your own liking.
*/
elevator_direction:
.byte 0
/* 0: door closed, elevator can move
* 1: door opening, waiting 5 seconds
*/
elevator_door_phase:
.byte 0
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