John Pote schrieb:
> Hi everyone,
>
> Have been using SDCC (Version 2.6.0 #4309 (Jul 28 2006)) for an Atmel
> AT89C2051 (MCS51) chip which has the rather limited RAM space of 64
> bytes. I wish to have a number of strings (char arrays) in code space as
> well as arrays of pointers to such strings. (The array of pointers is so
> the strings can be accessed via an index rather than by name.)
>
> The code,
>
> const char Thw_cmd[] = "thw";
> const char Cnts_cmd[] = "cnts";
> const char *cmds[] = { Thw_cmd, Cnts_cmd, NULL };
>
> duely places the strings in code space BUT the *cmds[] array in RAM
> space. As a result it also adds quite a bit of code to initialise cmds[].
>
> Is it possible to have the compiler place the cmds[] array in code space
> as well? That being so how could I declare a function so it would take a
> pointer so such a const array of pointers to const strings?
Only constants can be placed in code space. cmds is not constant (it is
a non-constant array of pointers to constants), thus has to be placed in
writeable memory. You probably want to write
const char * const cmds[] = { Thw_cmd, Cnts_cmd, NULL };
instead (this is a constant array of pointers to constants).
Philipp
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