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Wrap around memory

 
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Wrap around memory
PostPosted: Mon Oct 04, 2004 10:01 pm     Reply with quote
Hello everyone,

I need to implement a "wrap around" access on a 24LC256 memory.
It�s a kind of datalooger, in wich I will always have to read the last 32768
memory positions.
Suppose the logger has saved data until position X. Well, I will have to read, from X-32767 to position X.
Well, I have tried several ways, but nothing. Is there a way I could define a variable just from 0 to 32767 ?

Any help will be appreciated.
Haplo



Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia

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PostPosted: Mon Oct 04, 2004 10:10 pm     Reply with quote
Easy:

Code:
int16 Y;

Y++;
if (Y==32768)
    Y=0;


Or even better:

Code:

int16 Y;

Y++;
bit_clear(Y,15);
asmallri



Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia

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PostPosted: Mon Oct 04, 2004 10:23 pm     Reply with quote
or

Code:

signed int16 Y;

Y = abs(++y);


or

Code:

int16 Y;

Y = (++Y % 32768);
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