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C166 User's Guide

C166 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Error Messages Library Reference Library Files Source Code Standard Types jmp_buf ptrdiff_t size_t va_list wchar_t Macros HARRAY HVAR MARRAY MVAR XARRAY XVAR Routines By Category Buffer Manipulation Routines Character Routines Data Conversion Routines Intrinsic Routines Math Routines Memory Allocation Routines Stream I/O Routines String Routines Variable Length Argument Routines Miscellaneous Routines Include Files SFR Definitions absacc.h assert.h ctype.h float.h intrins.h limits.h math.h membox.h setjmp.h stdarg.h stddef.h stdio.h stdlib.h string.h Reference _alloc_boxf _alloc_boxh _alloc_boxn _atomic_ _bfld_ _calloc_boxf _calloc_boxh _calloc_boxn _chkdouble_ _chkfloat_ _crol_ _cror_ _diswdt_ _einit_ _endatomic_ _free_boxf _free_boxh _free_boxn _getkey _idle_ _init_boxf _init_boxh _init_boxn _irol_ _iror_ _lrol_ _lror_ _nop_ _pop_ _prior_ _priord_ _push_ _pwrdn_ _sof_ _srvwdt_ _testclear_ _testset_ _tolower _toupper _trap_ abs acos asin assert atan atan2 atof atoi atol calloc calloc_b ceil cos cosh exp fabs floor fmemccpy fmemchr fmemcmp fmemcpy fmemmove fmemset fmod free free_b fstrcat fstrchr fstrcmp fstrcpy fstrcspn fstrlen fstrncat fstrncmp fstrncpy fstrpbrk fstrpos fstrrchr fstrrpbrk fstrrpos fstrspn getchar gets hmemcmp hmemcpy hstrcmp hstrcpy init_mempool init_mempool_b isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper isxdigit labs log log10 longjmp malloc malloc_b memccpy memchr memcmp memcpy memmove memset modf offsetof pow printf putchar puts rand realloc realloc_b scanf setjmp sin sinh sprintf sqrt srand sscanf strcat strchr strcmp strcpy strcspn strlen strncat strncmp strncpy strpbrk strpos strrchr strrpbrk strrpos strspn strstr strtod strtol strtoul tan tanh toascii toint tolower toupper ungetchar va_arg va_end va_start vprintf vsprintf xcalloc xfree xinit_mempool xmalloc xmemccpy xmemchr xmemcmp xmemcpy xmemmove xmemset xrealloc xstrcmp xstrcpy xstrlen xstrncpy Appendix

_sof_

Summary
#include <intrins.h>

unsigned int _sof_ (
  void *ptr);          /* Tiny Model */

or

unsigned int _sof_ (
  void huge *ptr);     /* Other Models */
Description

The _sof_ routine converts ptr to a segment offset for segment 0. The result of _sof_ is valid only if the pointer refers to segment 0 in the C16x address space (0000h-0FFFFh).

The _sof_ routine is typically used to initialize source and destination pointers for PEC transfers. The offset value is calculated inline without a call to a library function.

Return Value

The _sof_ routine returns the offset of ptr in the 0 segment.

Example
 1     #include <intrins.h>
 2     #include <reg166.h>
 3
 4     int idata buf [5];
 5
 6     void main (void)  {
 7       DSTP0 = _sof_ ((void huge *)buf);  /* dest pointer */
 8       SRCP0 = (unsigned int) &ADDAT;     /* source pointer */
 9       PECC0 = 0x0205;                    /* transfer 5 words */
10     }

ASSEMBLY LISTING OF GENERATED OBJECT CODE

             ; FUNCTION main (BEGIN  RMASK = @0x4010)
                                    ; SOURCE LINE # 6
                                    ; SOURCE LINE # 7
0000 E6F40000 R    MOV     R4,#SOF (buf)
0004 F6F4E2FD      MOV     0FDE2H,R4
                                    ; SOURCE LINE # 8
0008 E6F4A0FE      MOV     R4,#0FEA0H ; ADDAT
000C F6F4E0FD      MOV     0FDE0H,R4
                                    ; SOURCE LINE # 9
0010 E6600502      MOV     PECC0,#0205H
                                    ; SOURCE LINE # 10
0014 CB00          RET
             ; FUNCTION main (END    RMASK = @0x4010)
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