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Split from Rotating bits in a word value.

 NEED for DWord in STL

fritz

Hello Gengus

leavea space between the "SLW" and the number and the"unexpected input end" error will be gone.

@Aret:
Nice work, I did a minor correction to the STL code and ran it through PLCSIM, the logicbelow should do the job:

[code]L #input
PUSH
SRW 1
AW W#16#5555
TAK
SLW 1
AW W#16#AAAA
OW
PUSH
SRW 2
AW W#16#3333
TAK
SLW 2
AW W#16#CCCC
OW
PUSH
SRW 4
AW W#16#F0F
TAK
SLW 4
AW W#16#F0F0
OW
CAW
T #output[/code]

I hope this helps

vigneshvasanth

need  rotating bits in a Dword Value using STL

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Split fromRotating bits in a word value.

The old posting where you originally posted, was discussing the mirroring of bits. In pseudo code it could be something like:

for n = 0 to 31
OUT.[n] = IN.[31-n]
end

The code is just not optimum, but it will work. Consider this point as the STL might be a handful to debug. 

C code concept 1:
(Reversing bits)                  ** Mr Jacek introduced me to this site

unsigned int v; // 32-bit word to reverse bit order    

// swap odd and even bits
v = ((v >> 1) & 0x55555555) | ((v & 0x55555555) << 1);

// swap consecutive pairs
v = ((v >> 2) & 0x33333333) | ((v & 0x33333333) << 2);

// swap nibbles ...
v = ((v >> 4) & 0x0F0F0F0F) | ((v & 0x0F0F0F0F) << 4);

// swap bytes
v = ((v >> 8) & 0x00FF00FF) | ((v & 0x00FF00FF) << 8);

// swap 2-byte long pairs
v = ( v >> 16             ) | ( v               << 16);

C code concept 2:
(Possible origin which the STL was based on)

The STL code based on concept 2..