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xitoa.S
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xitoa.S
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;---------------------------------------------------------------------------;
; Extended itoa, puts, printf and atoi (C)ChaN, 2006
;
; Module size: 277/261 words (max)
;
#define USE_XPUTS
#define USE_XITOA
#define USE_XPRINTF
#define CR_CRLF
#define USE_XATOI
.nolist
#include <avr/io.h> // Include device specific definitions.
.list
#ifdef SPM_PAGESIZE // Recent devices have "lpm Rd,Z+" and "movw".
.macro _LPMI reg
lpm \reg, Z+
.endm
.macro _MOVW dh,dl, sh,sl
movw \dl, \sl
.endm
#else // Earlier devices do not have "lpm Rd,Z+" nor "movw".
.macro _LPMI reg
lpm
mov \reg, r0
adiw ZL, 1
.endm
.macro _MOVW dh,dl, sh,sl
mov \dl, \sl
mov \dh, \sh
.endm
#endif
;---------------------------------------------------------------------------
; Stub function to forward to user output function
;
;Prototype: void xputc (char chr // a character to be output
; );
;Size: 17/17 words
.section .bss
.global xfunc_out ; xfunc_out must be initialized before using this module.
xfunc_out: .ds.w 1
.section .text
.global xputc
.func xputc
xputc:
#ifdef CR_CRLF
cpi r24, 10 ;LF --> CRLF
brne 1f ;
ldi r24, 13 ;
rcall 1f ;
ldi r24, 10 ;/
1:
#endif
push ZH
push ZL
lds ZL, xfunc_out+0 ;Pointer to the registered output function.
lds ZH, xfunc_out+1 ;/
sbiw ZL, 0
breq 2f
icall
2: pop ZL
pop ZH
ret
.endfunc
;---------------------------------------------------------------------------
; Direct ROM string output
;
;Prototype: void xputs (const prog_char *str // rom string to be output
; );
;Size: 10/7 words
#ifdef USE_XPUTS
.global xputs
.func xputs
xputs:
_MOVW ZH,ZL, r25,r24 ; Z = pointer to rom string
1: _LPMI r24
cpi r24, 0
breq 2f
rcall xputc
rjmp 1b
2: ret
.endfunc
#endif
;---------------------------------------------------------------------------
; Extended direct numeral string output (32bit version)
;
;Prototype: void xitoa (long value, // value to be output
; char radix, // radix
; char width); // minimum width
;Size: 59/59 words
;
#ifdef USE_XITOA
.global xitoa
.func xitoa
xitoa:
;r25:r22 = value, r20 = base, r18 = digits
clr r31 ;r31 = stack level
ldi r30, ' ' ;r30 = sign
ldi r19, ' ' ;r19 = filler
sbrs r20, 7 ;When base indicates signd format and the value
rjmp 0f ;is minus, add a '-'.
neg r20 ;
sbrs r25, 7 ;
rjmp 0f ;
ldi r30, '-' ;
com r22 ;
com r23 ;
com r24 ;
com r25 ;
adc r22, r1 ;
adc r23, r1 ;
adc r24, r1 ;
adc r25, r1 ;/
0: sbrs r18, 7 ;When digits indicates zero filled,
rjmp 1f ;filler is '0'.
neg r18 ;
ldi r19, '0' ;/
;----- string conversion loop
1: ldi r21, 32 ;r26 = r25:r22 % r20
clr r26 ;r25:r22 /= r20
2: lsl r22 ;
rol r23 ;
rol r24 ;
rol r25 ;
rol r26 ;
cp r26, r20 ;
brcs 3f ;
sub r26, r20 ;
inc r22 ;
3: dec r21 ;
brne 2b ;/
cpi r26, 10 ;r26 is a numeral digit '0'-'F'
brcs 4f ;
subi r26, -7 ;
4: subi r26, -'0' ;/
push r26 ;Stack it
inc r31 ;/
cp r22, r1 ;Repeat until r25:r22 gets zero
cpc r23, r1 ;
cpc r24, r1 ;
cpc r25, r1 ;
brne 1b ;/
cpi r30, '-' ;Minus sign if needed
brne 5f ;
push r30 ;
inc r31 ;/
5: cp r31, r18 ;Filler
brcc 6f ;
push r19 ;
inc r31 ;
rjmp 5b ;/
6: pop r24 ;Flush stacked digits and exit
rcall xputc ;
dec r31 ;
brne 6b ;/
ret
.endfunc
#endif
;---------------------------------------------------------------------------;
; Formatted string output (16/32bit version)
;
;Prototype:
; void xprintf (const prog_char *format, ...);
;Size: 104/94 words
;
#ifdef USE_XPRINTF
.global xprintf
.func xprintf
xprintf:
push YH
push YL
in YL, _SFR_IO_ADDR(SPL)
#ifdef SPH
in YH, _SFR_IO_ADDR(SPH)
#else
clr YH
#endif
#if FLASHEND > 0x1FFFF
adiw YL, 6 ;Y = pointer to arguments
#else
adiw YL, 5 ;Y = pointer to arguments
#endif
ld ZL, Y+ ;Z = pointer to format string
ld ZH, Y+ ;/
0: _LPMI r24 ;Get a format char
cpi r24, 0 ;End of format string?
breq 90f ;/
cpi r24, '%' ;Is format?
breq 20f ;/
1: rcall xputc ;Put a normal character
rjmp 0b ;/
90: pop YL
pop YH
ret
20: ldi r18, 0 ;r18: digits
clt ;T: filler
_LPMI r21 ;Get flags
cpi r21, '%' ;Is a %?
breq 1b ;/
cpi r21, '0' ;Zero filled?
brne 23f ;
set ;/
22: _LPMI r21 ;Get width
23: cpi r21, '9'+1 ;
brcc 24f ;
subi r21, '0' ;
brcs 90b ;
lsl r18 ;
mov r0, r18 ;
lsl r18 ;
lsl r18 ;
add r18, r0 ;
add r18, r21 ;
rjmp 22b ;/
24: brtc 25f ;get value (low word)
neg r18 ;
25: ld r24, Y+ ;
ld r25, Y+ ;/
cpi r21, 'c' ;Is type character?
breq 1b ;/
cpi r21, 's' ;Is type RAM string?
breq 50f ;/
cpi r21, 'S' ;Is type ROM string?
breq 60f ;/
_MOVW r23,r22,r25,r24 ;r25:r22 = value
clr r24 ;
clr r25 ;
clt ;/
cpi r21, 'l' ;Is long int?
brne 26f ;
ld r24, Y+ ;get value (high word)
ld r25, Y+ ;
set ;
_LPMI r21 ;/
26: cpi r21, 'd' ;Is type signed decimal?
brne 27f ;/
ldi r20, -10 ;
brts 40f ;
sbrs r23, 7 ;
rjmp 40f ;
ldi r24, -1 ;
ldi r25, -1 ;
rjmp 40f ;/
27: cpi r21, 'u' ;Is type unsigned decimal?
ldi r20, 10 ;
breq 40f ;/
cpi r21, 'X' ;Is type hexdecimal?
ldi r20, 16 ;
breq 40f ;/
cpi r21, 'b' ;Is type binary?
ldi r20, 2 ;
breq 40f ;/
rjmp 90b ;abort
40: push ZH ;Output the value
push ZL ;
rcall xitoa ;
42: pop ZL ;
pop ZH ;
rjmp 0b ;/
50: push ZH ;Put a string on the RAM
push ZL
_MOVW ZH,ZL, r25,r24
51: ld r24, Z+
cpi r24, 0
breq 42b
rcall xputc
rjmp 51b
60: push ZH ;Put a string on the ROM
push ZL
rcall xputs
rjmp 42b
.endfunc
#endif
;---------------------------------------------------------------------------
; Extended numeral string input
;
;Prototype:
; char xatoi ( /* 1: Successful, 0: Failed */
; const char **str, /* pointer to pointer to source string */
; long *res /* result */
; );
;Size: 94/91 words
;
#ifdef USE_XATOI
.global xatoi
.func xatoi
xatoi:
_MOVW r1, r0, r23, r22
_MOVW XH, XL, r25, r24
ld ZL, X+
ld ZH, X+
clr r18 ;r21:r18 = 0;
clr r19 ;
clr r20 ;
clr r21 ;/
clt ;T = 0;
ldi r25, 10 ;r25 = 10;
rjmp 41f ;/
40: adiw ZL, 1 ;Z++;
41: ld r22, Z ;r22 = *Z;
cpi r22, ' ' ;if(r22 == ' ') continue
breq 40b ;/
brcs 70f ;if(r22 < ' ') error;
cpi r22, '-' ;if(r22 == '-') {
brne 42f ; T = 1;
set ; continue;
rjmp 40b ;}
42: cpi r22, '9'+1 ;if(r22 > '9') error;
brcc 70f ;/
cpi r22, '0' ;if(r22 < '0') error;
brcs 70f ;/
brne 51f ;if(r22 > '0') cv_start;
ldi r25, 8 ;r25 = 8;
adiw ZL, 1 ;r22 = *(++Z);
ld r22, Z ;/
cpi r22, ' '+1 ;if(r22 <= ' ') exit;
brcs 80f ;/
cpi r22, 'b' ;if(r22 == 'b') {
brne 43f ; r25 = 2;
ldi r25, 2 ; cv_start;
rjmp 50f ;}
43: cpi r22, 'x' ;if(r22 != 'x') error;
brne 51f ;/
ldi r25, 16 ;r25 = 16;
50: adiw ZL, 1 ;Z++;
ld r22, Z ;r22 = *Z;
51: cpi r22, ' '+1 ;if(r22 <= ' ') break;
brcs 80f ;/
cpi r22, 'a' ;if(r22 >= 'a') r22 =- 0x20;
brcs 52f ;
subi r22, 0x20 ;/
52: subi r22, '0' ;if((r22 -= '0') < 0) error;
brcs 70f ;/
cpi r22, 10 ;if(r22 >= 10) {
brcs 53f ; r22 -= 7;
subi r22, 7 ; if(r22 < 10)
cpi r22, 10 ;
brcs 70f ;}
53: cp r22, r25 ;if(r22 >= r25) error;
brcc 70f ;/
60: ldi r24, 33 ;r21:r18 *= r25;
sub r23, r23 ;
61: brcc 62f ;
add r23, r25 ;
62: lsr r23 ;
ror r21 ;
ror r20 ;
ror r19 ;
ror r18 ;
dec r24 ;
brne 61b ;/
add r18, r22 ;r21:r18 += r22;
adc r19, r24 ;
adc r20, r24 ;
adc r21, r24 ;/
rjmp 50b ;repeat
70: ldi r24, 0
rjmp 81f
80: ldi r24, 1
81: brtc 82f
clr r22
com r18
com r19
com r20
com r21
adc r18, r22
adc r19, r22
adc r20, r22
adc r21, r22
82: st -X, ZH
st -X, ZL
_MOVW XH, XL, r1, r0
st X+, r18
st X+, r19
st X+, r20
st X+, r21
clr r1
ret
.endfunc
#endif