Using arrays to form a grid of bits

[Jim McBride]

I would like to map out an area using a grid of x,y bits. I can set(clear/test) individual bits of a single dimension array with:
bit_set(grid[i],n), setting the nth bit of the ith variable types location in the array.
Is it possible to set bits in a two dimensional array?
i.e. grid[ix][iy]
I can't find any reference to setting bits in a multi-dimensional array.
Any help/ideas/new approaches will be greatly appreciated!!
JMc
___________________________
This message was ported from CCS's old forum
Original Post ID: 12204

[Pete Smith]

:=I would like to map out an area using a grid of x,y bits. I can set(clear/test) individual bits of a single dimension array with:
:=bit_set(grid[i],n), setting the nth bit of the ith variable types location in the array.
:=Is it possible to set bits in a two dimensional array?
:=i.e. grid[ix][iy]
:=I can't find any reference to setting bits in a multi-dimensional array.

The CCS compiler doesn't allow arrays of bits. On occasion, it would be handy to do this automatically, but it doesn't hurt to do the conversion myself!

:=Any help/ideas/new approaches will be greatly appreciated!!

I do it pretty much the way you do it, but I use a function as a wrapper, so I have

write_array(value,x,y)

and

value=read_array(x,y)

where I pretty much do what you've done above.

Pete.
___________________________
This message was ported from CCS's old forum
Original Post ID: 12206

[Hans Wedemeyer]

Is this what you mean... ?

I read you question and it appears to me you answered it yourself. ! :-) Athough you did not say how big the array should be, in the case of 32 X 32 bits

int32 Grid[32]; // becomes a 32 X 32 two dimensional array of BITS

Simply using your original code allows you to set/clear or get
any bit at x,y

bit_set(Grid[i],n); // where Grid[i] is the X and n is the Y

bit_clear(Grid[i],n);

bit_test(Grid[i],n);
___________________________
This message was ported from CCS's old forum
Original Post ID: 12244

[Jim Mcbride]

<font face="Courier New" size=-1>:=:=I would like to map out an area using a grid of x,y bits. I can set(clear/test) individual bits of a single dimension array with:
:=:=bit_set(grid[i],n), setting the nth bit of the ith variable types location in the array.
:=:=Is it possible to set bits in a two dimensional array?
:=:=i.e. grid[ix][iy]
:=:=I can't find any reference to setting bits in a multi-dimensional array.
:=
:=The CCS compiler doesn't allow arrays of bits. On occasion, it would be handy to do this automatically, but it doesn't hurt to do the conversion myself!
:=
:=:=Any help/ideas/new approaches will be greatly appreciated!!
:=
:=I do it pretty much the way you do it, but I use a function as a wrapper, so I have
:=
:=write_array(value,x,y)
:=
:=and
:=
:=value=read_array(x,y)
:=
:=where I pretty much do what you've done above.
:=
:=Pete.

If I try to make an array large enouph for my application, I get out of ram errors pretty quick. Using 16 bit pointers halped a little, but not nearly enough. So I thought I would build my own array in memory directly using read/write_bank(). The problem is that no matter what I try the I can't simulate putting anything into memory where I want it. I tried turning off 16 bit pointers. I have tried all banks with no success. I can write to an address and get back a totally diferent number. What am I missing??

oops..
ok reading and writting to the same bank and getting data. Simulator File Register window still does not show data in memory location.</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 12306