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Structure Help

 
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Jerry
Guest
Structure Help
PostPosted: Tue Feb 15, 2005 8:18 pm     Reply with quote
This is some sample code that I have found on web.

Can I define a structure this way with this PCH compiler.

Getting error #27 Expression must evaluate to a constant.

This is a portion of code.

Code:


#include <18F252.h>
#fuses hs, nowdt, noprotect, nolvp, put, NOOSCSEN
#device *=16 icd=TRUE
#device adc=8

#define FONT_COUNT 1

const unsigned char dot_font_table[] = {
      /* ' ' charwidth: 2 */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */

      /* '!' charwidth: 2 */
      0x00,    /*  [  ]  */
      0x80,    /*  [* ]  */
      0x80,    /*  [* ]  */
      0x80,    /*  [* ]  */
      0x00,    /*  [  ]  */
      0x80,    /*  [* ]  */
      0x00,    /*  [  ]  */
};

const unsigned char font_width_table[] = {
       2, /* ' ' */
       2, /* '!' */
};

    typedef struct
    {
       char store_width;            /* font storage width in bytes */
       char font_height;            /* font height for storage */
       char *font_table;            /* font table start address in memory */
       char fixed_width;            /* fixed width of font. If zero */
                                    /* then use the width table. */
       char *width_table;            /* variable width table start address */
       char charmap_beg;         /* start ascii offset in table */
       char charmap_end;         /* end ascii offset in table */
       char char_def;            /* code for undefined char code */
    } FONT_DEF;
   

FONT_DEF fonts[FONT_COUNT] = {
            {1,  7, dot_font_table, 0, width_width_table,' ','!','!'}};



main()
{

}


Thanks in advance for any help.

Jerry
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Tue Feb 15, 2005 9:35 pm     Reply with quote
No pointers to constants allowed in CCS.
Jerry
Guest
PostPosted: Tue Feb 15, 2005 9:55 pm     Reply with quote
What would be the correct syntax if I don't use the constants for tables.


Thanks

Jerry
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

View user's profile Send private message Send e-mail

PostPosted: Tue Feb 15, 2005 10:13 pm     Reply with quote
Like this:
Code:

#include <18F252.h>
#fuses hs, nowdt, noprotect, nolvp, put, NOOSCSEN
#device *=16 icd=TRUE
#device adc=8

#define FONT_COUNT 1

unsigned char dot_font_table[] = {
      /* ' ' charwidth: 2 */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */
      0x00,    /*  [  ]  */

      /* '!' charwidth: 2 */
      0x00,    /*  [  ]  */
      0x80,    /*  [* ]  */
      0x80,    /*  [* ]  */
      0x80,    /*  [* ]  */
      0x00,    /*  [  ]  */
      0x80,    /*  [* ]  */
      0x00,    /*  [  ]  */
};

unsigned char font_width_table[] = {
       2, /* ' ' */
       2, /* '!' */
};

    typedef struct
    {
       char store_width;            /* font storage width in bytes */
       char font_height;            /* font height for storage */
       char *font_table;            /* font table start address in memory */
       char fixed_width;            /* fixed width of font. If zero */
                                    /* then use the width table. */
       char *width_table;            /* variable width table start address */
       char charmap_beg;         /* start ascii offset in table */
       char charmap_end;         /* end ascii offset in table */
       char char_def;            /* code for undefined char code */
    } FONT_DEF;
   

FONT_DEF fonts[FONT_COUNT] = {
            1,  7, dot_font_table, 0, font_width_table,' ','!','!'};



main()
{

}
Jerry
Guest
PostPosted: Tue Feb 15, 2005 10:24 pm     Reply with quote
Hey Mark;

I get the same error ???

Now what

Thanks Jerry
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

View user's profile Send private message Send e-mail

PostPosted: Wed Feb 16, 2005 8:22 am     Reply with quote
Did you copy and paste the code I posted? It compiles just fine for me.
Jerry
Guest
PostPosted: Wed Feb 16, 2005 10:46 pm     Reply with quote
Thanks Very Happy
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