Lustre Programming Language Help For Students
Introduction To LUSTRE
LUSTRE, whose main application field is the programming of automatic control and signal processing systems. In this field, design istra- ditionally driven by means of two types of tools. First, specifications are often systems of equations (differential or finite difference equations, boolean equations, . . .). Second, implementations are often nets of operators connected with wires (switches, gates, analog diagrams). Such tools present several ad&tag- as a basis for a programming language.
Let us illustrate the use of LUSTRE language through the programming of a stopwatch.
@ode TWO-STATES (init. set, reset: bool) returns (state : bool) ; let state = tel : running = init -> if set and not prefstate) then true else if reset and precstate) then false ale0 prefetate) ; TWO,STATES(falee. start-stop. atart,stop); The complete program of this first version of the stopwatch is as follows: node SIMPLE-STOPWATCH (start-stop, reset. hs: boo11 returns (time: int): var CK. running: bool: let time = current(COUNT((0. 1. reset) when CK)); CK = true -> (HS and running) or reset: running = TWO,STATESffalse, start-atop, start-stop); tel;
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