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/*-------------------------------------------------------------------------
x_ftoa.c - wrapper function to use _convert_float
Copyright (C) 2004, Vangelis Rokas <vrokas at otenet.gr>
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
As a special exception, if you link this library with other files,
some of which are compiled with SDCC, to produce an executable,
this library does not by itself cause the resulting executable to
be covered by the GNU General Public License. This exception does
not however invalidate any other reasons why the executable file
might be covered by the GNU General Public License.
-------------------------------------------------------------------------*/
#include <float.h>
extern int convert_frac;
extern int convert_int;
/* char x_ftoa(float, __data char *, unsigned char, unsigned char); */
extern int POSTDEC1;
extern int PLUSW2;
extern int FSR0L;
extern int FSR0H;
extern int PREINC1;
extern int PREINC2;
extern int FSR2L;
extern int FSR2H;
#define _vv0x00 0x00
#define _vv0x01 0x01
#define _vv0x02 0x02
#define _vv0x03 0x03
#define _vv0x04 0x04
/* do not warn about unreferenced arguments/missing return values */
#pragma save
#pragma disable_warning 59
#pragma disable_warning 85
char x_cnvint_wrap(unsigned long num, __data char *buffer)
{
__asm
movff _vv0x00, _POSTDEC1
movff _vv0x01, _POSTDEC1
movff _vv0x02, _POSTDEC1
movff _vv0x03, _POSTDEC1
movlw 2
movff _PLUSW2, _vv0x00
movlw 3
movff _PLUSW2, _vv0x01
movlw 4
movff _PLUSW2, _vv0x02
movlw 5
movff _PLUSW2, _vv0x03
movlw 6
movff _PLUSW2, _FSR0L
movlw 7
movff _PLUSW2, _FSR0H
call _convert_int
/* return value is already in WREG */
movff _PREINC1, _vv0x03
movff _PREINC1, _vv0x02
movff _PREINC1, _vv0x01
movff _PREINC1, _vv0x00
__endasm ;
}
char x_cnvfrac_wrap(unsigned long num, __data char *buffer, unsigned char prec)
{
num;
buffer;
prec;
__asm
movff _vv0x00, _POSTDEC1
movff _vv0x01, _POSTDEC1
movff _vv0x02, _POSTDEC1
movff _vv0x03, _POSTDEC1
movff _vv0x04, _POSTDEC1
movlw 2
movff _PLUSW2, _vv0x00
movlw 3
movff _PLUSW2, _vv0x01
movlw 4
movff _PLUSW2, _vv0x02
movlw 5
movff _PLUSW2, _vv0x03
movlw 6
movff _PLUSW2, _FSR0L
movlw 7
movff _PLUSW2, _FSR0H
movlw 8
movff _PLUSW2, _vv0x04
call _convert_frac
/* return value is already in WREG */
movff _PREINC1, _vv0x04
movff _PREINC1, _vv0x03
movff _PREINC1, _vv0x02
movff _PREINC1, _vv0x01
movff _PREINC1, _vv0x00
__endasm ;
}
#pragma restore
union float_long {
unsigned long l;
float f;
};
char x_ftoa(float num, __data char *buffer, unsigned char buflen, unsigned char prec)
{
char len;
signed char expn;
unsigned long ll;
unsigned long li;
// volatile
union float_long f_l;
len = buflen;
while(len--)buffer[len] = 0;
f_l.f = num;
if((f_l.l & SIGNBIT) == SIGNBIT) {
f_l.l &= ~SIGNBIT;
*buffer = '-';
buffer++;
}
expn = EXCESS - EXP(f_l.l); // - 24;
ll = MANT(f_l.l);
li = 0;
while( expn ) {
if(expn < 0) {
li <<= 1;
if(ll & 0x00800000UL)li |= 1;
ll <<= 1;
expn++;
} else {
ll >>= 1;
expn--;
}
}
if(li)
len = x_cnvint_wrap(li, buffer);
else {
*buffer = '0'; len = 1;
}
buffer += len;
if(prec) {
*buffer = '.'; len++;
buffer++;
len += x_cnvfrac_wrap(ll, buffer, 24-prec);
buffer[ prec ] = '\0';
}
return (len);
}
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