bit order inverting

[Macgman2000]

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

[mister_e]

in a loop.. well i guess.


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


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

[Dwayne]

Hello Nick,

Nick
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


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

[mister_e]

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


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

Bit7 will be Bit0 and so on


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!


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...

[Macgman2000]

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