I don't think the compiler can tell what the address of "x" would be at
compile time. Common practice is to initialize such a table at run time.
I can imagine (just a thought), an assembler .org directive to reserve a
pgm memory for your table at fixed address which would be a constant
expression then, but it's not worth doing in my opinion.
Regards, Marek
On Sat, 2011-03-19 at 00:20 +0100, Volkmar Dierkes wrote:
> Hello,
>
> I want to create a table like this:
>
> unsigned char lcd_display_function[] PROGMEM = {
> LOK_FCT0_POSX, LOK_FCT0_POSY, LOK_FCT0_ENDX, LOK_FCT0_POSY,
> SOFTKEY_BORDER0_COLOR,
> CLCD_FIFO_CMD_SUBEND};
>
> Each value is a constant in a range of 0<=x<=255 defined with #define.
>
> This works fine so far, but I am in the need to add also an address of
> another table in PROGMEM, like this:
>
> unsigned char foo[] PROGMEM = {0, 1, 2};
>
> I tried several ways to add this to the list above, like this:
>
> #define lo8(x) (((int)(x)&0xff))
> #define hi8(x) (((int)(x)>>8))
>
> unsigned char lcd_display_function[] PROGMEM = {
> CLCD_FIFO_CMD_FILLRECT, LOK_FCT0_POSX, LOK_FCT0_POSY, LOK_FCT0_ENDX,
> LOK_FCT0_POSY, SOFTKEY_BORDER0_COLOR,
> lo8(foo), hi8(foo),
> CLCD_FIFO_CMD_SUBEND};
>
> but it results always in an error:
> error: initializer element is not constant
>
> Do you have any idea how this could be solved?
>
> Thanks
> Volkmar
>
>
>
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