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using idata

i tried to make a space but it's still said "missing ';' before '_at_'"
i wrote :
char idata nim[14] _at_ 0x00;

and is idata starting address at 0x80?
and data starting address at 0x00?

so, if i want to set an array starting at the first address of idata, is it right if i define the array as idata and starting address at 0x00?

or i should starting at 0x80?

thanks very much

sincerly,
hardian

Parents

0 Jon Ward over 24 years ago

I created the following program:

char idata nim[14] _at_ 0x00;

void main (void)
{
}

And compiled it with no errors. The following listing file was generated:

C51 COMPILER V6.10  TEST                                                                   01/26/2001 19:19:14 PAGE 1   


C51 COMPILER V6.10, COMPILATION OF MODULE TEST
OBJECT MODULE PLACED IN .\test.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE .\test.c DEBUG OBJECTEXTEND CODE SYMBOLS

stmt level    source

   1          char idata nim[14] _at_ 0x00;
   2          
   3          void main (void)
   4          {
   5   1      }
   6          
C51 COMPILER V6.10  TEST                                                                   01/26/2001 19:19:14 PAGE 2   

ASSEMBLY LISTING OF GENERATED OBJECT CODE


             ; FUNCTION main (BEGIN)
                                           ; SOURCE LINE # 3
                                           ; SOURCE LINE # 4
                                           ; SOURCE LINE # 5
0000 22                RET     
             ; FUNCTION main (END)

C51 COMPILER V6.10  TEST                                                                   01/26/2001 19:19:14 PAGE 3   

NAME                                    CLASS   MSPACE  TYPE    OFFSET  SIZE
====                                    =====   ======  ====    ======  ====


main . . . . . . . . . . . . . . . . .  PUBLIC   CODE   PROC     0000H  -----
nim. . . . . . . . . . . . . . . . . .  PUBLIC   IDATA  ARRAY    0000H  14


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =      1    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)

Jon

Reply

0 Jon Ward over 24 years ago

I created the following program:

char idata nim[14] _at_ 0x00;

void main (void)
{
}

And compiled it with no errors. The following listing file was generated:

C51 COMPILER V6.10  TEST                                                                   01/26/2001 19:19:14 PAGE 1   


C51 COMPILER V6.10, COMPILATION OF MODULE TEST
OBJECT MODULE PLACED IN .\test.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE .\test.c DEBUG OBJECTEXTEND CODE SYMBOLS

stmt level    source

   1          char idata nim[14] _at_ 0x00;
   2          
   3          void main (void)
   4          {
   5   1      }
   6          
C51 COMPILER V6.10  TEST                                                                   01/26/2001 19:19:14 PAGE 2   

ASSEMBLY LISTING OF GENERATED OBJECT CODE


             ; FUNCTION main (BEGIN)
                                           ; SOURCE LINE # 3
                                           ; SOURCE LINE # 4
                                           ; SOURCE LINE # 5
0000 22                RET     
             ; FUNCTION main (END)

C51 COMPILER V6.10  TEST                                                                   01/26/2001 19:19:14 PAGE 3   

NAME                                    CLASS   MSPACE  TYPE    OFFSET  SIZE
====                                    =====   ======  ====    ======  ====


main . . . . . . . . . . . . . . . . .  PUBLIC   CODE   PROC     0000H  -----
nim. . . . . . . . . . . . . . . . . .  PUBLIC   IDATA  ARRAY    0000H  14


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =      1    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)

Jon

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