-
Notifications
You must be signed in to change notification settings - Fork 0
/
convert.asm
714 lines (671 loc) · 17.1 KB
/
convert.asm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
;=============================================================================
; Ïîäïðîãðàììû äëÿ ïðåîáðàçîâàíèÿ ÷èñåë â ñòðîêè è îáðàòíî
;
; (C) 2017-2020 Vitaliy Zinoviev
; https://github.com/nf-zvv/IVC_Tracer_v2
;
; History
; =======
; 27.08.2017 äîáàâëåíà STR_TO_UINT16
; 24.07.2020 äîáàâëåíà ATOI
; 28.07.2020 äîáàâëåíà ITOA_FAST_DIV
;
;=============================================================================
#ifndef _CONVERT_ASM_
#define _CONVERT_ASM_
;=============================================================================
;
; Ïðåîáðàçîâàíèå ÷èñëà â ñòðîêó
;
;=============================================================================
;------------------------------------------------------------------------------
; Ïðåîáðàçîâàíèå 16-áèòíîãî ÷èñëà â ñòðîêó
; Ìåòîä: äåëåíèå íà 10 ñäâèãàìè è ñëîæåíèÿìè
;
; ITOA_FAST_DIV - ñ ó÷¸òîì çíàêà
; UTOA_FAST_DIV - áåç ó÷¸òà çíàêà
;
; Íåîáõîäèì áóôåð äëèíîé íå ìåíåå 7 áàéò äëÿ ñòðîêè (çíàê, 5 áàéò ÷èñëà, ñèìâîë \0)
;
; http://we.easyelectronics.ru/Soft/preobrazuem-v-stroku-chast-1-celye-chisla.html
;
; Èñïîëüçóþòñÿ: r18*, r19*, r20*, r21*, r23*, r26*, r27*, r28*, r29*
; Âõîä: X (r27:r26) - ÷èñëî
; Y (r29:r28) - óêàçàòåëü íà áóôåð
; Âûõîä: áóôåð
;------------------------------------------------------------------------------
ITOA_FAST_DIV:
clt
; îïðåäåëÿåì çíàê ÷èñëà
and r27,r27
brpl UTOA_FAST_DIV
set ; óñòàíîâèòü ôëàã T êàê ôëàã îòðèöàòåëüíîãî ÷èñëà
; Èçìåíèòü çíàê ÷èñëà
com r27
neg r26
sbci r27,0xFF
UTOA_FAST_DIV:
; çàïîëíÿåì áóôåð ïðîáåëàìè
ldi r18,7
ldi r19,' '
UTOA_FAST_DIV_ZEROING:
st Y+,r19
dec r18
brne UTOA_FAST_DIV_ZEROING
st -Y,__zero_reg__ ; ïîìåùàåì íîëü â êîíåö ñòðîêè
UTOA_FAST_DIV_1:
; res.quot = n >> 1;
movw r20,r26
lsr r21
ror r20
; res.quot += res.quot >> 1;
movw r18,r26
lsr r19
ror r18
lsr r19
ror r18
add r20,r18
adc r21,r19
; res.quot += res.quot >> 4;
movw r18,r20
ldi r23,0x04 ; 4 ñäâèãà
UTOA_FAST_DIV_2:
lsr r19
ror r18
dec r23
brne UTOA_FAST_DIV_2
add r20,r18
adc r21,r19
; res.quot += res.quot >> 8;
mov r18,r21
eor r19,r19
add r18,r20
adc r19,r21
; res.quot >>= 3;
movw r20,r18
ldi r23,0x03 ; 3 ñäâèãà
UTOA_FAST_DIV_3:
lsr r21
ror r20
dec r23
brne UTOA_FAST_DIV_3
; res.rem = (uint8_t)(n - ((res.quot << 1) + (qq & ~7ul)));
andi r18,0xF8 ; 248
mov r27,r26
sub r27,r18
mov r26,r20
add r26,r26
sub r27,r26
; if(res.rem > 9)
cpi r27,0x0A ; 10
brcs UTOA_FAST_DIV_4
; res.rem -= 10;
subi r27,0x0A ; 10
; res.quot++;
subi r20,0xFF ; 255
sbci r21,0xFF ; 255
; do
; {
; divmod10_t res = divmodu10(value);
; *--buffer = res.rem + '0';
UTOA_FAST_DIV_4:
subi r27,0xD0 ; 208
st -Y,r27
; value = res.quot;
movw r26,r20
; }
; while (value != 0);
sbiw r26,0x00 ; 0
brne UTOA_FAST_DIV_1
; return buffer;
; }
; Ïðîâåðèòü çíàê ÷èñëà
brtc UTOA_FAST_DIV_EXIT
ldi r23,'-'
st -Y,r23
clt
UTOA_FAST_DIV_EXIT:
ret
;--------------------------------------------------------------
; Ïðåîáðàçîâàíèå äâîè÷íîãî îäíîáàéòîâîãî ÷èñëà â ñòðîêó
;
; Èñïîëüçóþòñÿ: r16*, r17*
; Âõîä: r16 - ÷èñëî [0 - 255]
; Y - pointer to null-terminating string
; Âûõîä: Y - pointer to null-terminating string
;--------------------------------------------------------------
DEC_TO_STR4:
LDI r17, -1
DEC_TO_STR4_1:
INC r17
SUBI r16, 100
BRSH DEC_TO_STR4_1
SUBI r16, -100
SUBI r17,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r17
LDI r17, -1
DEC_TO_STR4_2:
INC r17
SUBI r16, 10
BRSH DEC_TO_STR4_2
SUBI r17,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r17
SUBI r16, -10
SUBI r16,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r16
CLR r16
ST Y+,r16 ; \0 - null-terminating string
RET
;------------------------------------------------------------------------------
; Convert unsigned number to string
;
; USED: r16*, r26*, r27*, r28*, r29*
; CALL:
; IN: X - ÷èñëî [0 - 9999], [0x0000 - 0x270F]
; Y - pointer to null-terminating string
; OUT: Y - pointer to null-terminating string
;------------------------------------------------------------------------------
DEC_TO_STR5:
LDI r16, -1
DEC_TO_STR5_1:
INC r16
SUBI r26, Low(1000)
SBCI r27, High(1000)
BRSH DEC_TO_STR5_1
SUBI r26, Low(-1000)
SBCI r27, High(-1000)
SUBI r16,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r16 ; ñîõðàíèòü êîä öèôðû
LDI r16, -1
DEC_TO_STR5_2:
INC r16
SUBI r26, Low(100)
SBCI r27, High(100)
BRSH DEC_TO_STR5_2
SUBI r26, -100
SUBI r16,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r16 ; ñîõðàíèòü êîä öèôðû
LDI r16, -1
DEC_TO_STR5_3:
INC r16
SUBI r26, 10
BRSH DEC_TO_STR5_3
SUBI r16,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r16 ; ñîõðàíèòü êîä öèôðû
SUBI r26,-10
SUBI r26,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r26 ; ñîõðàíèòü êîä öèôðû
CLR r16
ST Y+,r16 ; \0 - null-terminating string
ret
;------------------------------------------------------------------------------
; Convert signed number to string
;
; USED: r16*, r26*, r27*, r28*, r29*
; CALL:
; IN: X - ÷èñëî [0..65535], [0x0000..0xFFFF]
; Y - pointer to null-terminating string
; OUT: Y - pointer to null-terminating string
;------------------------------------------------------------------------------
DEC_TO_STR7:
; îïðåäåëèòü çíàê
SBRC r27,7
RJMP DEC_TO_STR7_SIGN
LDI r16,' '
ST Y+,r16
RJMP DEC_TO_STR7_START
DEC_TO_STR7_SIGN:
ldi r16,'-'
st Y+,r16
; ñìåíà çíàêà
com r26
com r27
subi r26,low(-1)
sbci r27,high(-1)
DEC_TO_STR7_START:
LDI r16, -1
DEC_TO_STR7_0:
INC r16
SUBI r26, Low(10000)
SBCI r27, High(10000)
BRSH DEC_TO_STR7_0
SUBI r26, Low(-10000)
SBCI r27, High(-10000)
SUBI r16,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r16 ; ñîõðàíèòü êîä öèôðû
LDI r16, -1
DEC_TO_STR7_1:
INC r16
SUBI r26, Low(1000)
SBCI r27, High(1000)
BRSH DEC_TO_STR7_1
SUBI r26, Low(-1000)
SBCI r27, High(-1000)
SUBI r16,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r16 ; ñîõðàíèòü êîä öèôðû
LDI r16, -1
DEC_TO_STR7_2:
INC r16
SUBI r26, Low(100)
SBCI r27, High(100)
BRSH DEC_TO_STR7_2
SUBI r26, -100
SUBI r16,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r16 ; ñîõðàíèòü êîä öèôðû
LDI r16, -1
DEC_TO_STR7_3:
INC r16
SUBI r26, 10
BRSH DEC_TO_STR7_3
SUBI r16,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r16 ; ñîõðàíèòü êîä öèôðû
SUBI r26,-10
SUBI r26,-0x30 ; ïðåîáðàçîâàòü öèôðó â ASCII êîä
ST Y+,r26 ; ñîõðàíèòü êîä öèôðû
CLR r16
ST Y+,r16 ; \0 - null-terminating string
RET
;=============================================================================
;
; Ïðåîáðàçîâàíèå ñòðîêè â ÷èñëî
;
;=============================================================================
;-----------------------------------------------------------------------------
; Ïðåîáðàçîâàíèå ñòðîêè â ÷èñëî
; Ðàáîòàåò êàê ñ ïîëîæèòåëüíûìè (0...65535),
; òàê è ñ îòðèöàòåëüíûìè ÷èñëàìè (-32767...32767)
; Êàê òîëüêî âñòðå÷àåòñÿ íå ÷èñëî, ïðåîáðàçîâàíèå çàâåðøàåòñÿ
;
; Èñïîëüçóþòñÿ: r16*, r24*, r25*, r28*, r29*
; Âõîä: Y (0-ended ñòðîêà)
; Âûõîä: r25:r24
;-----------------------------------------------------------------------------
ATOI:
clr r24 ; Î÷èñòèòü r24
clr r25 ; Î÷èñòèòü r25
clt
ATOI_1:
ld r16,Y+
cpi r16,0x20 ; ïðîáåë
breq ATOI_1
cpi r16,0x09
brcs atoi_2
cpi r16,0x0E
brcs ATOI_1
ATOI_2:
cpi r16,'+'
breq ATOI_3
cpi r16,'-'
brne ATOI_4
set
rjmp ATOI_3
ATOI_5:
rcall MULHI_CONST_10
add r24,r16
adc r25,__zero_reg__
ATOI_3:
ld r16,Y+
ATOI_4:
subi r16,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
cpi r16,0x0A ; 10
brcs ATOI_5
brtc ATOI_EXIT
; åñëè ÷èñëî îòðèöàòåëüíîå
com r25
neg r24
sbci r25,0xFF
ATOI_EXIT:
ret
;-----------------------------------------------------------------------------
; Óìíîæåíèå íà 10
;
; Èñïîëüçóþòñÿ: r0*, r1*, r23*, r24*, r25*
; Âõîä: r25:r24
; Âûõîä: r25:r24
;-----------------------------------------------------------------------------
MULHI_CONST_10:
ldi r23,10
mul r25,r23
mov r25,r0
mul r24,r23
mov r24,r0
add r25,r1
ret
;-----------------------------------------------------------------------------
; Ïðåîáðàçîâàíèå ñòðîêè â ÷èñëî
; 0...65535
; Èñïîëüçóþòñÿ: r16*, r24*, r25*, r28*, r29*
; Âõîä: Y (0-ended ñòðîêà)
; Âûõîä: r25:r24, r13
; r13 = 0 óñïåøíî
; r13 = 1 íå ÷èñëî
; r13 = 2 ñëèøêîì áîëüøîå
;-----------------------------------------------------------------------------
.def tmpL = r22
.def tmpH = r23
.def WL = r24
.def WH = r25
STR_TO_UINT16:
clr r24 ; Îáíóëÿåì ðåçóëüòàò
clr r25
rcall STR_LEN ; Îïðåäåëÿåì äëèíó ñòðîêè
cpi r16,1
breq STR_TO_UINT16_1DIGIT
cpi r16,2
breq STR_TO_UINT16_2DIGIT
cpi r16,3
breq STR_TO_UINT16_3DIGIT
cpi r16,4
breq STR_TO_UINT16_4DIGIT
cpi r16,5
breq STR_TO_UINT16_5DIGIT
rjmp STR_TO_UINT16_TOOBIG
;--------------------
STR_TO_UINT16_5DIGIT:
ld r17,Y+
rcall IS_DIGIT ; ïðîâåðÿåì - öèôðà ëè ýòî
tst r16
breq STR_TO_UINT16_NONDIGIT
subi r17,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
ldi tmpL,low(10000)
ldi tmpH,high(10000)
STR_TO_UINT16_LOOP5:
tst r17
breq STR_TO_UINT16_4DIGIT
add WL,tmpL
adc WH,tmpH
dec r17
rjmp STR_TO_UINT16_LOOP5
;--------------------
STR_TO_UINT16_4DIGIT:
ld r17,Y+
rcall IS_DIGIT ; ïðîâåðÿåì - öèôðà ëè ýòî
tst r16
breq STR_TO_UINT16_NONDIGIT
subi r17,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
ldi tmpL,low(1000)
ldi tmpH,high(1000)
STR_TO_UINT16_LOOP4:
tst r17
breq STR_TO_UINT16_3DIGIT
add WL,tmpL
adc WH,tmpH
dec r17
rjmp STR_TO_UINT16_LOOP4
;--------------------
STR_TO_UINT16_3DIGIT:
ld r17,Y+
rcall IS_DIGIT ; ïðîâåðÿåì - öèôðà ëè ýòî
tst r16
breq STR_TO_UINT16_NONDIGIT
subi r17,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
ldi tmpL,100
mul r17,tmpL
add WL,r0
adc WH,r1
;--------------------
STR_TO_UINT16_2DIGIT:
ld r17,Y+
rcall IS_DIGIT ; ïðîâåðÿåì - öèôðà ëè ýòî
tst r16
breq STR_TO_UINT16_NONDIGIT
subi r17,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
ldi tmpL,10
mul r17,tmpL
add WL,r0
adc WH,r1
;--------------------
STR_TO_UINT16_1DIGIT:
ld r17,Y+
rcall IS_DIGIT ; ïðîâåðÿåì - öèôðà ëè ýòî
tst r16
breq STR_TO_UINT16_NONDIGIT
subi r17,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
clr tmpL
add WL,r17
adc WH,tmpL
clr r13 ; ñòàòóñ - óñïåõ
ret
STR_TO_UINT16_NONDIGIT:
ldi r16,1
mov r13,r16
ret
STR_TO_UINT16_TOOBIG:
ldi r16,2
mov r13,r16
ret
.undef tmpL
.undef tmpH
;-----------------------------------------------------------------------------
; Ïðåîáðàçîâàíèå ñòðîêè â ÷èñëî
; 0...255
; Èñïîëüçóþòñÿ: r13*, r16*, r17*, r24* Y*
; Âõîä: Y (0-ended ñòðîêà)
; Âûõîä: r24, r13
; r13 = 0 óñïåøíî
; r13 = 1 íå ÷èñëî
; r13 = 2 ñëèøêîì áîëüøîå
; ÇÀÌÅ×ÀÍÈÅ! Ïðèìèòèâíûé êîä. Íàäî óëó÷øèòü.
;-----------------------------------------------------------------------------
STR_TO_UINT8:
ld r17,Y+
tst r17
breq str_end
rcall IS_DIGIT ; ïðîâåðÿåì - öèôðà ëè ýòî
tst r16
breq str_to_uint8_nondigit
inc r16 ; ïîäñ÷åò äëèíû ÷èñëà
rjmp STR_TO_UINT8
str_end:
; îêàçàëèñü çäåñü, çíà÷èò äëèíà ÷èñëà ïîäñ÷èòàíà
ld r17,-Y ; ñ÷èòàëè /0 - ñèìâîë êîíöà ñòðîêè
ld r17,-Y ; ñ÷èòàëè ïåðâóþ öèôðó - åäèíèöû
subi r17,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
mov WL,r17 ; ðåçóëüòàò - åäèíèöû
dec r16 ; óìåíüøàåì ñ÷åò÷èê öèôð
tst r16 ; íå êîí÷èëèñü ëè öèôðû?
breq str_to_uint8_finish
ld r17,-Y ; ñ÷èòàëè âòîðóþ öèôðó - äåñÿòêè
subi r17,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
ldi r18,10
mul r17,r18 ; âûïîëíÿåì óìíîæåíèå íà 10
add WL,r0 ; ïðèáàâëÿåì ê ðåçóëüòàòó äåñÿòêè
dec r16 ; óìåíüøàåì ñ÷åò÷èê öèôð
tst r16 ; íå êîí÷èëèñü ëè öèôðû?
breq str_to_uint8_finish
ld r17,-Y ; ñ÷èòàëè òðåòüþ öèôðó - ñîòíè
cpi r17,3 ; åñëè òðè è áîëüøå - ñëèøêîì ìíîãî
brsh str_to_uint8_too_big
str_to_uint8_next:
subi r17,'0' ; ïåðåâîäèì ASCII êîä öèôðû â ÷èñëî
ldi r18,100
mul r17,r18 ; âûïîëíÿåì óìíîæåíèå íà 100
add WL,r0 ; ïðèáàâëÿåì ê ðåçóëüòàòó ñîòíè
brcs str_to_uint8_too_big
dec r16 ; óìåíüøàåì ñ÷åò÷èê öèôð
tst r16 ; íå êîí÷èëèñü ëè öèôðû?
breq str_to_uint8_finish
; åñëè îêàçàëèñü òóò, çíà÷èò
; öèôðû òàê è íå êîí÷èëèñü - ñòàòóñ too big
str_to_uint8_too_big:
ldi r16,2
mov r13,r16
ret
str_to_uint8_nondigit:
ldi r16,1
mov r13,r16
ret
str_to_uint8_finish:
clr r13 ; ñòàòóñ - óñïåõ
ret
.undef WL
.undef WH
;=============================================================================
;
; Ïðåîáðàçîâàíèå ÷èñëà â BCD ôîðìàò
;
;=============================================================================
;--------------------------------------------------------------
; Ïðåîáðàçîâàíèå äâîè÷íîãî îäíîáàéòîâîãî ÷èñëà â BCD ôîðìàò
; Âõîä: r16
; Âûõîä: r8-r10 (BCD_1 - BCD_3)
;--------------------------------------------------------------
.def BCD_1 = r4
.def BCD_2 = r5
.def BCD_3 = r6
Bin1ToBCD3:
LDIL BCD_1, -1
Bin1ToBCD3_1:
INC BCD_1
SUBI r16, 100
BRSH Bin1ToBCD3_1
SUBI r16, -100
LDIL BCD_2, -1
Bin1ToBCD3_2:
INC BCD_2
SUBI r16, 10
BRSH Bin1ToBCD3_2
SUBI r16, -10
MOV BCD_3,r16
RET
;------------------------------------------------------------------------------
; Ïðåîáðàçîâàíèå äâîè÷íîãî äâóõáàéòîâîãî ÷èñëà â BCD ôîðìàò
; Âõîä: X(r27:r26)
; Âûõîä: r11-r14 (BCD_4 - BCD_7)
;------------------------------------------------------------------------------
.def BCD_4 = r22
.def BCD_5 = r23
.def BCD_6 = r24
.def BCD_7 = r25
Bin2ToBCD4:
LDIL BCD_4, -1
Bin2ToBCD4_1:
INC BCD_4
SUBI r26, Low(1000)
SBCI r27, High(1000)
BRSH Bin2ToBCD4_1
SUBI r26, Low(-1000)
SBCI r27, High(-1000)
LDIL BCD_5, -1
Bin2ToBCD4_2:
INC BCD_5
SUBI r26, Low(100)
SBCI r27, High(100)
BRSH Bin2ToBCD4_2
SUBI r26, -100
LDIL BCD_6, -1
Bin2ToBCD4_3:
INC BCD_6
SUBI r26, 10
BRSH Bin2ToBCD4_3
SUBI r26, -10
MOV BCD_7,r26
RET
;------------------------------------------------------------------------------
; 2BIN to 5BCD
; 16-bit binary to 5-digit packed BCD conversion (0..65535)
; "shift-plus-3" method
;
; Source: https://www.avrfreaks.net/forum/16bit-binary-bcd
;
; IN: r17:r16 = HEX value
; OUT: r20:r19:r18 = BCD value
;------------------------------------------------------------------------------
hexToBcd:
push r16
push r17
push r21
push r22
push xl
push xh
clr r18
clr r19
clr r20
clr xh
ldi r21, 16
hexToBcd1:
ldi xl, 20 + 1
hexToBcd2:
ld r22, -x
subi r22, -3
sbrc r22, 3
st x, r22
ld r22, x
subi r22, -0x30
sbrc r22, 7
st x, r22
cpi xl, 18
brne hexToBcd2
lsl r16
rol r17
rol r18
rol r19
rol r20
dec r21
brne hexToBcd1
pop xh
pop xl
pop r22
pop r21
pop r17
pop r16
ret
;------------------------------------------------------------------------------
;*
;* Bin3BCD == 24-bit Binary to BCD conversion
;*
;* fbin0:fbin1:fbin2 >>> tBCD0:tBCD1:tBCD2:tBCD3
;* hex dec
;* r16r17r18 >>> r20r21r22r23
;*
;------------------------------------------------------------------------------
.def fbin0 =r22 ; binary value byte 0 (LSB)
.def fbin1 =r23 ; binary value byte 1
.def fbin2 =r24 ; binary value byte 2 (MSB)
.def tBCD0 =r25 ; BCD value digits 0 and 1
.def tBCD1 =r26 ; BCD value digits 2 and 3
.def tBCD2 =r27 ; BCD value digits 4 and 5
.def tBCD3 =r28 ; BCD value digits 6 and 7 (MSD)
Bin3BCD16:
ldi tBCD3,0xfa ;initialize digits 7 and 6
binbcd_107:
subi tBCD3,-0x10 ;
subi fbin0,byte1(10000*1000) ;subit fbin,10^7
sbci fbin1,byte2(10000*1000) ;
sbci fbin2,byte3(10000*1000) ;
brcc binbcd_107 ;
binbcd_106: dec tBCD3 ;
subi fbin0,byte1(-10000*100) ;addit fbin,10^6
sbci fbin1,byte2(-10000*100) ;
sbci fbin2,byte3(-10000*100) ;
brcs binbcd_106 ;
ldi tBCD2,0xfa ;initialize digits 5 and 4
binbcd_105: subi tBCD2,-0x10 ;
subi fbin0,byte1(10000*10) ;subit fbin,10^5
sbci fbin1,byte2(10000*10) ;
sbci fbin2,byte3(10000*10) ;
brcc binbcd_105 ;
binbcd_104: dec tBCD2 ;
subi fbin0,byte1(-10000) ;addit fbin,10^4
sbci fbin1,byte2(-10000) ;
sbci fbin2,byte3(-10000) ;
brcs binbcd_104 ;
ldi tBCD1,0xfa ;initialize digits 3 and 2
binbcd_103: subi tBCD1,-0x10 ;
subi fbin0,byte1(1000) ;subiw fbin,10^3
sbci fbin1,byte2(1000) ;
brcc binbcd_103 ;
binbcd_102: dec tBCD1 ;
subi fbin0,byte1(-100) ;addiw fbin,10^2
sbci fbin1,byte2(-100) ;
brcs binbcd_102 ;
ldi tBCD0,0xfa ;initialize digits 1 and 0
binbcd_101: subi tBCD0,-0x10 ;
subi fbin0,10 ;subi fbin,10^1
brcc binbcd_101 ;
add tBCD0,fbin0 ;LSD
ret ;
#endif /* _CONVERT_ASM_ */
;------------------------------------------------------------------------------
; End of file
;------------------------------------------------------------------------------