bit order inverting

Hello,

What is the quickest way to invert the order of bits in an 8bit register? Currently I have data that is essentially backwards in order...IE, LSB is in the MSB poisition and MSB is in the LSB position.....

TempVar = 11011010, I want to flip it to this FinalVar= 01011011

Best Regards,
Nick

in a loop.. well i guess.

Code:

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for BitToShift=0 to 7
    FinalVar.0[7-BitToShift]=InitialVar.0[BitToShift]
    next

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There's probably a tons of way but this is the first who comes..

Hello Nick,

Nick

Quote:

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What is the quickest way to invert the order of bits in an 8bit register? Currently I have data that is essentially backwards in order...IE, LSB is in the MSB poisition and MSB is in the LSB position.....

TempVar = 11011010, I want to flip it to this FinalVar= 01011011

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First off:
to invert the bits you subtract from 255
TembVar=255-TembVar

11011010 would become 00100101

Second off:

Your example is NOT a switch of LSB/MSB

11011010 would be 10101101

The Rev command could be used.... you would reverse bits.

(right out of the manual)
B0 = %10101100 REV 4 (You would use 8)

Your example shows this... Is this what you want?

Edit: (I notice Steve and I were looking at the exact same forum thread in which we were playing with reversing strings....) Steve you is fast!

DWayne

Dwayne...you're not only hearing impaired, your blind too ROFL... just kidding

Quote:

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TempVar = 11011010, I want to flip it to this FinalVar= 01011011

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Bit7 will be Bit0 and so on

Quote:

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Originally Posted by Dwayne

Edit: (I notice Steve and I were looking at the exact same forum thread in which we were playing with reversing strings....) Steve you is fast!

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Sometime i just sit in the Who's online and look what's happening... no secret :)

BUT Yeah you're right REV will do the job. I never used it before 'cause i never had to swap bits. YEAH STEVE RTFM!!!

I post this picture for me...

Actually I clocked in data to a Temp Variable. The data came in lsb first. So in actuality I want the mirror image of the bit order. Example:

TempVar=11000001....this was shifted in lsb first, 8x so lsb is now in msb position.

I want it to be msb in msb position......FinalVar=10000011. I will try out your suggestion. Thanks!


Best Regards,
Nick