FB_DataFifo.TcPOU
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<?xml version="1.0" encoding="utf-8"?>
<TcPlcObject Version="1.1.0.1" ProductVersion="3.1.4024.11">
<POU Name="FB_DataFifo" Id="{d56a36d5-a9e2-464d-82c2-924a10cada6f}" SpecialFunc="None">
<Declaration><![CDATA[FUNCTION_BLOCK FB_DataFifo
VAR_INPUT
bPutData : BOOL;
bGetData : BOOL;
bClearFifo : BOOL;
pPutData : pvoid;
pGetData : pvoid;
nDataLen : UDINT;
pFifoMemory : pvoid;
nFifoSize : DINT;
END_VAR
VAR_OUTPUT
bFifoEmpty : BOOL;
bFifoFull : BOOL;
iFifoSizeLeft : DINT;
END_VAR
VAR
fbGetTaskId : GETCURTASKINDEX;
nTaskId : BYTE;
iPutIndex : DINT;
iGetIndex : DINT;
pPutIndex : DINT;
pGetIndex : DINT;
bIs1Sec : BOOL;
END_VAR]]></Declaration>
<Implementation>
<ST><![CDATA[
IF bClearFifo THEN
iPutIndex := 0; iGetIndex := 0;
iFifoSizeLeft := nFifoSize;
bFifoEmpty := TRUE;
RETURN;
END_IF
IF NOT(bFifoFull) THEN
IF bPutData THEN
IF iPutIndex >= nFifoSize THEN
iPutIndex := 0;
END_IF
pPutIndex := iPutIndex * nDataLen;
MEMCPY(pFifoMemory + pPutIndex, pPutData, nDataLen);
iPutIndex := iPutIndex + 1;
iFifoSizeLeft := iFifoSizeLeft - 1;
END_IF
END_IF;
IF NOT(bFifoEmpty) THEN
IF bGetData THEN
bIs1Sec := iGetIndex >= nFifoSize;
IF bIs1Sec THEN
iGetIndex := 0;
END_IF
pGetIndex := iGetIndex * nDataLen;
MEMCPY(pGetData, pFifoMemory + pGetIndex , nDataLen);
iGetIndex := iGetIndex + 1;
iFifoSizeLeft := iFifoSizeLeft + 1;
END_IF
END_IF;
(*
_TaskInfo[GETCURTASKINDEX()].FirstCycle;
SystemTaskInfoArr[SystemInfo.RuntimeNo].firstCycle
*)
fbGetTaskId();
IF _TaskInfo[fbGetTaskId.index].FirstCycle THEN
iFifoSizeLeft := nFifoSize;
END_IF
IF iFifoSizeLeft = 0 THEN
bFifoFull := TRUE;
ELSE
bFifoFull := FALSE;
END_IF
IF iFifoSizeLeft >= nFifoSize THEN
bFifoEmpty := TRUE;
ELSE
bFifoEmpty := FALSE;
END_IF
]]></ST>
</Implementation>
<LineIds Name="FB_DataFifo">
<LineId Id="117" Count="1" />
<LineId Id="122" Count="1" />
<LineId Id="126" Count="0" />
<LineId Id="124" Count="0" />
<LineId Id="121" Count="0" />
<LineId Id="36" Count="14" />
<LineId Id="155" Count="1" />
<LineId Id="51" Count="8" />
<LineId Id="77" Count="0" />
<LineId Id="84" Count="1" />
<LineId Id="60" Count="0" />
<LineId Id="81" Count="0" />
<LineId Id="79" Count="0" />
<LineId Id="87" Count="1" />
<LineId Id="61" Count="15" />
<LineId Id="9" Count="0" />
</LineIds>
</POU>
</TcPlcObject>