pointer to table

[stan cartwright]

Is it possible to have several tables and change the pointer to any one?
I tried data=data1 but get- can't find data error. There doesn't seem to be a way without if then or select case which would be too slow.
It's been asked before. I'll try using strings instead. Is mid(stringvar) as fast as reading a table item?

sub plot
readtable data,ptr,pixel
etc.
end sub
table data1
1,2,3
end table
table data2
4,5,6
end table

[stan cartwright]

It got complicated with strings. I want tables/arrays of glcd colours, 0's don't plot and re,bl,gn defined as ili9341 colours which are 16 bit numbers I think.
I'm using a 18f25k22
• Up to 64 Kbytes Linear Program Memory
I'm new to pics and haven't done basic since the 80's when you could use a rem statement to store data or code because you knew the address. Don't think that's useful now.
If I dim four arrays ,dim a1(100),a2(100)..could I find the address of 1st element and use that with peek?

[Anobium]

If you use arrays then just address the specific element or elements should be no need for peek or poke.

If you explain what outcome you are trying to achieve , and, some high level pseudo code - folks may be able to assist.

Anobium

P.S. if you using v0.98.00 RC4 please stop using. There is a very serious bug and results of pretty simple calcs with braces anda array elements with no yield the correct ASM or Hex file.

[stan cartwright]

It's a simple sprite sub to plot/erase...or not plot/erase pixels on ili9341.
I need to be able to change sprite_data to point to sprite_data1 , 2 etc.
a 12x12 sprite is 144 bytes and a table is only 255 bytes so a big table is out.
I could read the tables into an array and use a pointer to each data set..hmm,I'll try that.
I'll look at the asm of some code and see how arrays and tables are done if I can follow it.
I changed my code to use select case and a var to use different tables but as the code stood it tested for each pixel in the table so was visually flickery.

sub sprite (sprite_x,sprite_y,sprite_height,sprite_width,sprite_data,pset_sprite)
  ptr=0:py=sprite_y
  if pset_sprite=0 then ;erase sprite
    for sprite_row=1 to sprite_height
      for sprite_column=0 to sprite_width-1
        ReadTable sprite_data,ptr,pixel
        if pixel>0 then ;erase pixel
          pset sprite_x+sprite_column,py,GLCDBackground
        end if
        ptr=ptr+1
      next sprite_column
      py=py+1
    next sprite_row
  else ;plot sprite
    for sprite_row=1 to sprite_height
      for sprite_column=0 to sprite_width-1
        ReadTable sprite_data,ptr,pixel
        if pixel>0 then ;plot pixel
          pset sprite_x+sprite_column,py,pixel
        end if
        ptr=ptr+1
      next sprite_column
      py=py+1
    next sprite_row
  end if
end sub
;
table sprite_data
0,0,0,0,0,ye,ye,0,0,0,0,0
0,0,0,ye,ye,wh,wh,ye,ye,0,0,0
0,0,ye,bl,bl,wh,wh,bl,bl,ye,0,0
0,ye,bl,bl,bl,wh,wh,bl,bl,bl,ye,0
0,ye,bl,bl,bl,wh,wh,bl,bl,bl,ye,0
ye,wh,wh,wh,wh,wh,wh,wh,wh,wh,wh,ye
ye,re,re,re,re,re,re,re,re,re,re,ye
0,ye,re,wh,wh,wh,wh,wh,wh,re,ye,0
0,ye,re,wh,wh,wh,wh,wh,wh,re,ye,0
0,0,ye,re,re,wh,wh,re,re,ye,0,0
0,0,0,ye,re,re,re,re,ye,0,0,0
0,0,0,0,0,ye,ye,0,0,0,0,0
end table