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lib/derivative_st.txt
author Mario de Sousa <msousa@fe.up.pt>
Thu, 31 Mar 2011 21:06:36 +0100
changeset 262 197ba42d78b2
parent 192 c6c2a3d487ac
child 276 1679f514f38a
permissions -rwxr-xr-x
Do not crash when checking semantics of undeclared symbolic_variable.
NOTE: this update may have broken the printing of error messages
during semantic analysis of IL code.
192
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 FUNCTION_BLOCK DERIVATIVE
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   VAR_INPUT
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     RUN : BOOL ;          (* 0 = reset                  *)
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     XIN : REAL ;          (* Input to be differentiated *)
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     CYCLE : TIME ;        (* Sampling period            *)
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   END_VAR
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   VAR_OUTPUT
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     XOUT : REAL ;         (* Differentiated output      *)
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   END_VAR
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   VAR X1, X2, X3 : REAL ; END_VAR
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   IF RUN THEN
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      XOUT := (3.0 * (XIN - X3) + X1 - X2)
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              / (10.0 * TIME_TO_REAL(CYCLE)) ;
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      X3 := X2 ; X2 := X1 ; X1 := XIN ;
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   ELSE XOUT := 0.0; X1 := XIN ; X2 := XIN ; X3 := XIN ;
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   END_IF ;
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 END_FUNCTION_BLOCK
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