# needs two volume pumps and a pipe analyzer
# fill_pump points to the tank storage
# evac_pump points back to the gas-feed
# analyzer is on a pipe between punps and tank
# !!! Remember to set volume pump to 10l !!! 

alias tank_stor d0
alias fill_pump d1
alias evac_pump d2
alias analyzer d3

alias tank_in r0
alias tank_hash r1
alias stor_press r2
alias gas_move r3
alias fill_press r4

define canister_hash 42280099
define smart_canister_hash -668314371

start:
ls tank_in tank_stor 0 Occupied # check tank in

beqz tank_in evac
bgtz tank_in setpress

evac:
l stor_press analyzer Pressure # get pipe pressure
s evac_pump On 1 # run evac_pump
s fill_pump On 0 # stop fill_pump
bgtz stor_press evac # pressure >0, evac more
# else, shut off evac_pump and go to start
s evac_pump On 0
j start

setpress:
ls tank_hash tank_stor 0 OccupantHash # ident tank
# set safe fill-pressure
beq tank_hash canister_hash regular
beq tank_hash smart_canister_hash smart

regular:
move fill_press 8000000 # regular tank safe max
j fill # start filling

smart:
move fill_press 18000000 # smart tank safe max
j fill # start filling

fill:
ls stor_press tank_stor 0 Pressure # get tank press
slt gas_move stor_press fill_press # room for more?
s fill_pump On gas_move # trigger fill pump
j start