#ifndef __ASSEMBLER__
typedef struct
{
int16_t  fld1;
uint8_t  fld2;
} record_t;
/**************/
record_t var1,var2;
#else
#define fld1 0
#define fld2 2
.extern var1,var2
#endif

#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <stddef.h>

#include "dds.h" // File containing struct to be processed

char * replace_dots( char * inStr)
{
char *inPtr = inStr ;
for ( ; *inStr; inStr++)
{
if ( *inStr == '.')
*inStr = '_' ;
}
return inPtr ;
}

#define print_offset( str, arg) fprintf( fileP, ".equ %s, %d \n\r", replace_dots(#arg), offsetof( str, arg))

int main( void)
{
FILE *fileP ;
char fileName[] = "dds_offsets.inc" ;

if ( (fileP = fopen( fileName, "wb")) == NULL )
{
printf( " Couldn't write to file %s.", fileName) ;
return 1 ;
}

print_offset( dds_t , A.Core.phaseInc) ;
print_offset( dds_t , B.Core.phaseInc) ;
print_offset( dds_t , C.Core.phaseInc) ;
print_offset( dds_t , A.wavePtr) ;
print_offset( dds_t , B.wavePtr) ;

fclose( fileP) ;
return 0 ;
}

.equ A_Core_phaseInc, 4

.equ B_Core_phaseInc, 36

.equ C_Core_phaseInc, 68  
...

#include "dds_offsets.inc"
...
ldr    r1, [r0, #A_Core_phaseInc]
...