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AnnexF/lag1_st.txt
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 06 May 2016 11:01:21 +0300
changeset 1006 0668ba32de98
parent 0 fb772792efd1
permissions -rwxr-xr-x
fix C compilation warning about function prototype in __SET_EXTERNAL

Example warning:
./POUS.c:1220:3: error: function declaration isn't a prototype [-Werror=strict-prototypes]
__SET_EXTERNAL(data__->,KN_AUT,,__GET_VAR(data__->KEY_AUT.STATE_OUT));
^
compilation terminated due to -Wfatal-errors.
cc1: all warnings being treated as errors 
 FUNCTION_BLOCK LAG1
   VAR_INPUT
     RUN : BOOL ;     (* 1 = run, 0 = reset *)
     XIN : REAL ;     (* Input variable *)
     TAU : TIME ;     (* Filter time constant *)
     CYCLE : TIME ;   (* Sampling time interval *)
   END_VAR
   VAR_OUTPUT XOUT : REAL ; END_VAR  (* Filtered output *)
   VAR K : REAL ;     (* Smoothing constant, 0.0<=K<1.0 *)
   END_VAR
   IF RUN THEN XOUT := XOUT + K * (XIN - XOUT) ;
   ELSE XOUT := XIN ;
        K := TIME_TO_REAL(CYCLE) / TIME_TO_REAL(CYCLE + TAU) ;
   END_IF ;
 END_FUNCTION_BLOCK
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