So I should keep the first part of the script to obtain the first conversion and add a second part to do 255-inputvalue and then again another conversion
like:
i=$1
n=(255-i)
bit0=$(( (i & 0x01) > 0 ))
bit1=$(( (i & 0x02) > 0 ))
bit2=$(( (i & 0x04) > 0 ))
bit3=$(( (i & 0x08) > 0 ))
bit4=$(( (i & 0x10) > 0 ))
bit5=$(( (i & 0x20) > 0 ))
bit6=$(( (i & 0x40) > 0 ))
bit7=$(( (i & 0x80) > 0 ))
Is there perhaps a quicker negation of already producted single bit0-bit7 bits ??
I need it for a little project in BeagleBone GPIO, not quite homework...(homework should be done many years ago....when I was younger with less woody brain... )
Thank you
Last edited by digiteltlc; 12-11-2013 at 04:44 AM..
REMEBER! What I have shown you is for 8 bits...
IF you require 16 bits the subtract your number from 65535...
(Similarly for 32 bits, etc...)
Look at your problem logically...
"$1" is the first user argument of your shell script and it looks as though you will be entering your script as something like this:-
<CR> == carraiage return...
You have saved this argument inside your variable "i"
So "i" now contains a _string_ representation of your binary value...
Use something like:-
To change each bit...
This method keeps it all inside bash builtins...
I am at work ATM so replies will be sporadic from me so have a go yourself... ;o)
Might I suggest using what is already available?
I hope that this is useful. I got the basis of this elsewhere on the board so I thought I should share it.
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