How to avoid continuous shooting (holding fire key)?

[lukebord1]

Hi enthusiasts! I've a FIRE issue:

it's easy to write a "single shot" routine, by playing with variables. But...

is there a way to get a kind of "keypress/keyup" listener, in order to avoid an annoying continuous shooting while holding the fire key?

[lukebord1]

Thanks to a great BiNMaN suggestion, here's the solution combined with my code:

IF KEY 4   // shoot
 IF PARAMA = 0   // avoid continuous shooting while key holding
   IF G = 4   // single shoot condition (0-3 gives bullet's direction)
    LET PARAMA = 1
    LET G = IMAGE   // used for bullet's direction
    SPAWN 5 10   // bullet sprite
   ENDIF
 ENDIF
ELSE
 LET PARAMA = 0
ENDIF