Is CCS able to manage long tables

[joe06]

Hi All,
Is this delaration allowed on a 16F877 ?

BYTE myvar[3][40];

this makes 3 tables of 40 Bytes, resulting in a 120 bytes table. on a 16F877, each RAM banks are 96 bytes length, is CCS able to split this table to the different RAM banks ?
thanks
joe
___________________________
This message was ported from CCS's old forum
Original Post ID: 12662

[PCM programmer]

:=Hi All,
:=Is this delaration allowed on a 16F877 ?
:=
:=BYTE myvar[3][40];
:=
:=this makes 3 tables of 40 Bytes, resulting in a 120 bytes table. on a 16F877, each RAM banks are 96 bytes length, is CCS able to split this table to the different RAM banks ?
---------------------------------------------------------

CCS can not span ram banks with a large array.
___________________________
This message was ported from CCS's old forum
Original Post ID: 12675

[mark r. hahn]

:=Hi All,
:=Is this delaration allowed on a 16F877 ?
:=
:=BYTE myvar[3][40];
:=
:=this makes 3 tables of 40 Bytes, resulting in a 120 bytes table. on a 16F877, each RAM banks are 96 bytes length, is CCS able to split this table to the different RAM banks ?
:=thanks
:=joe

CCS can't handle this, but you can at the expense of some additional code. For example I had to have a 120 byte array for one project. I just split it into 2 60 byte arrays.

// in bank 0
byte array1[60];

// in bank 1
byte array2[60];

// use a function to access array
byte get_array_value(int index)
{
if (idx < 60)
return(array1[idx]);
else
return(array2[idx-60]);
}

Hey, I know it's sleazy. If you want better code, use one of the 18Fxxx parts, they have tons of RAM.

Mark
___________________________
This message was ported from CCS's old forum
Original Post ID: 12693

[joe06]

ok thanks, I finally found a trick for that, creating 2 functions read_array and write_array, with both dimensions passed as parameters, and using #locate to place my splitted arrays in different banks.
joe

:=:=Hi All,
:=:=Is this delaration allowed on a 16F877 ?
:=:=
:=:=BYTE myvar[3][40];
:=:=
:=:=this makes 3 tables of 40 Bytes, resulting in a 120 bytes table. on a 16F877, each RAM banks are 96 bytes length, is CCS able to split this table to the different RAM banks ?
:=---------------------------------------------------------
:=
:=CCS can not span ram banks with a large array.
___________________________
This message was ported from CCS's old forum
Original Post ID: 12705