[Sdcc-user] Storage class "code"

[Thorsten G. <tho...@gm...>]

Hi all,

a few words to the question about the storage of a data array
in code space.

To store an array in code space you can do this (e.g.) :

unsigned int code CRC16Table[256] = {
    0x0000,  0x1021,  0x2042,  0x3063,  0x4084,  0x50a5,  0x60c6,  0x70e7,
    0x8108,  0x9129,  0xa14a,  0xb16b,  0xc18c,  0xd1ad,  0xe1ce,  0xf1ef,
    .......
    0x6e17,  0x7e36,  0x4e55,  0x5e74,  0x2e93,  0x3eb2,  0x0ed1,  0x1ef0
    };

for a one-dimensional array, or e.g.

unsigned char code LOCATION[4][16] = {
{0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,
                                       
0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F},
                                      
{0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,
                                       
0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF},
                                      
{0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,
                                       
0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F},
                                      
{0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,
                                       
0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF} };

for a two dimensional array.

The storage classes and their usage are described in the SDCC doc (pdf)
on page 20/21.

I hope it will help...

Best regards, Thorsten

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                       Dipl.-Ing.(FH) Thorsten Godau

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