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鐑棬涓嬭浇

闄勪欢涓績&闄勪欢鑱氬悎2.0
For Discuz! X2.5 © hgcad.com

OSCAT搴撴枃浠舵簮浠ｇ爜_ST璇█2020_3_5.pdf

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涓婁紶浼氬憳: tripodwang
涓婁紶鏃堕棿: 2020-03-05
鏈珯缃戝潃: bbs.hicodesys.com
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涓嬭浇闄勪欢

OSCAT搴撴枃浠舵簮浠ｇ爜_ST璇█:

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(* @NESTEDCOMMENTS := 'Yes' *)

(* @PATH := '\/Buffer Management' *)

(* @OBJECTFLAGS := '0, 8' *)

(* @SYMFILEFLAGS := '2048' *)

FUNCTION _BUFFER_CLEAR : BOOL

VAR_INPUT

PT: POINTER TO BYTE;

SIZE: UINT;

END_VAR

VAR

ptw: POINTER TO DWORD;

temp

WORD;

end,end32 : DWORD;

END_VAR

version 1.2 31.oct. 2008

programmer hugo

tested by oscat

this function will initialize a given arrayof byte with 0.

the function needs to be called: _buffer_clear(adr("array"),sizeof("array"));

this function will manipulate a given array.

the function manipulates the original array,it rerturnes true when finished.

because this function works with pointers itsvery time efficient and it needs no extra memory.

(* @END_DECLARATION := '0' *)

(* this routine uses 32 bit access to gainspeed *)

(* first access bytes till pointer is alignedfor 32 bit access *)

temp := pt;

end := temp + UINT_TO_DWORD(size);

end32 := end - 3;

WHILE (pt < end) AND ((temp AND16#00000003) > 0) DO

pt^:= 0;

pt:= pt + 1;

temp:= temp + 1;

END_WHILE;

(* pointer is aligned, now copy 32 bits at atime *)

ptw := pt;

WHILE ptw < end32 DO (* *)

ptw^:= 0;

ptw:= ptw + 4;

END_WHILE;

(* copy the remaining bytes in byte mode *)

pt := ptw;

WHILE pt < end DO

pt^:= 0;

pt:= pt + 1;

END_WHILE;

_BUFFER_CLEAR := TRUE;

(* revision History

hm 5.mar. 2008 rev 1.0

originalversion

hm 16.mar. 2008 rev 1.1

addedtype conversion to avoid warnings under codesys 30

chagedtype of input size to uint

deletedunused variable i

hm 31.oct. 2008 rev 1.2

correctedan error while routine would write outside of arrays

END_FUNCTION

[hide]

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