Gray Code
Stampers,
Anyone have a listing or details on GRAY CODE?
I know it is a "sort of" binary code where only one bit changes at a
time, but as for the sequence I have no idea!
Tim Stockman
Anyone have a listing or details on GRAY CODE?
I know it is a "sort of" binary code where only one bit changes at a
time, but as for the sequence I have no idea!
Tim Stockman
Comments
>Stampers,
>
>Anyone have a listing or details on GRAY CODE?
>
>I know it is a "sort of" binary code where only one bit changes at a
>time, but as for the sequence I have no idea!
Here ya go:
http://www.opticalencoder.com/copi_abs_enc.html
Gray code is an expanding binary sequence, where only a one-bit, bit change
is permitted during the expansion (iterative count). It's cumbersome on one
hand, but great for absolute encoders on the other. As the text will show,
a series of OR statements can be used for decoding.
I believe Tracy may have a "state machine" (which see) on his website for
decoding Grey code. It pretty much follows the cite above. Check on his
website at :
[noparse][[/noparse] http://ourworld.compuserve.com/homepages/emesys/BS2misc.htm ]
for the Gray code to binary routine.
Regards,
Bruce
>Tim Stockman
to the next higher value, change only the least significant bit which
brings you to the new state. Horowitz and Hill cover this on page 477 (2nd
ed.)
4-bit Gray code is:
Value Gray code
MSb LSb
0 0000
1 0001
2 0011
3 0010
4 0110
5 0111
6 0101
7 0100
8 1100
9 1101
A 1111
B 1110
C 1010
D 1011
E 1001
F 1000
Steve Roberts: sroberts@s...