This will return the status of a receive filter. The filter ID retrieved from canFilterCreate, canFilterCreateOnce, or canFilterCreateX must be used to identify the filter.
Input:
filterid : SINT
ID for the filter.
Returns: INT
-1
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- Illegal filter ID.
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0
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- Filter not created.
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1
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- Filter active.
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2
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- Filter inactive (the number of received message has reached the limit for the filter).
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Declaration:
FUNCTION canFilterStatus : INT;
VAR_INPUT
filterid : SINT;
END_VAR;
Example:
INCLUDE rtcu.inc
VAR
canRX : canReceiveMessage;
buf : ARRAY [1..8] OF SINT;
END_VAR;
PROGRAM CANExample;
VAR
Filter_ID : SINT;
FilterOnce : SINT;
timer : TON;
END_VAR;
canOpen(baud := 250);
canRX(data := ADDR(buf));
timer.pt := 1000;
Filter_ID := canFilterCreate(xtd := TRUE, startID := 16#0EFDD600, length := 6);
BEGIN
...
canRX();
IF canRX.ready THEN
DebugMsg(message:="Message received!");
DebugFmt(message:="canRX.xtd= \1", v1:=INT(canRX.xtd));
DebugFmt(message:="canRX.ID= \4", v4:=canRX.ID);
DebugFmt(message:="canRX.DataSize= \1", v1:=INT(canRX.DataSize));
END_IF;
...
timer(trig := TRUE);
IF timer.q THEN
IF canFilterStatus(filterid := FilterOnce) <> 1 THEN
canFilterDestroy(filterid := FilterOnce);
FilterOnce := canFilterCreateOnce(xtd := TRUE, startID := 16#0E00FDD3, length := 1);
END_IF;
timer(trig := FALSE);
END_IF;
...
END;
END_PROGRAM;
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