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
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
|
/**********************************************************/
/* Serial Bootloader for Atmel megaAVR Controllers */
/* */
/* tested with ATmega8, ATmega128 and ATmega168 */
/* should work with other mega's, see code for details */
/* */
/* ATmegaBOOT.c */
/* */
/* 20070626: hacked for Arduino Diecimila (which auto- */
/* resets when a USB connection is made to it) */
/* by D. Mellis */
/* 20060802: hacked for Arduino by D. Cuartielles */
/* based on a previous hack by D. Mellis */
/* and D. Cuartielles */
/* */
/* Monitor and debug functions were added to the original */
/* code by Dr. Erik Lins, chip45.com. (See below) */
/* */
/* Thanks to Karl Pitrich for fixing a bootloader pin */
/* problem and more informative LED blinking! */
/* */
/* For the latest version see: */
/* http://www.chip45.com/ */
/* */
/* ------------------------------------------------------ */
/* */
/* based on stk500boot.c */
/* Copyright (c) 2003, Jason P. Kyle */
/* All rights reserved. */
/* see avr1.org for original file and information */
/* */
/* This program 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 of the License, or */
/* (at your option) any later version. */
/* */
/* This program 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 program; if not, write */
/* to the Free Software Foundation, Inc., */
/* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* */
/* Licence can be viewed at */
/* http://www.fsf.org/licenses/gpl.txt */
/* */
/* Target = Atmel AVR m128,m64,m32,m16,m8,m162,m163,m169, */
/* m8515,m8535. ATmega161 has a very small boot block so */
/* isn't supported. */
/* */
/* Tested with m168 */
/**********************************************************/
/* $Id$ */
/* some includes */
#include <inttypes.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
/* the current avr-libc eeprom functions do not support the ATmega168 */
/* own eeprom write/read functions are used instead */
#ifndef __AVR_ATmega168__
#include <avr/eeprom.h>
#endif
/* Use the F_CPU defined in Makefile */
/* 20060803: hacked by DojoCorp */
/* 20070626: hacked by David A. Mellis to decrease waiting time for auto-reset */
/* set the waiting time for the bootloader */
/* get this from the Makefile instead */
/* #define MAX_TIME_COUNT (F_CPU>>4) */
/* 20070707: hacked by David A. Mellis - after this many errors give up and launch application */
#define MAX_ERROR_COUNT 5
/* set the UART baud rate */
/* 20060803: hacked by DojoCorp */
//#define BAUD_RATE 115200
#define BAUD_RATE 19200
/* SW_MAJOR and MINOR needs to be updated from time to time to avoid warning message from AVR Studio */
/* never allow AVR Studio to do an update !!!! */
#define HW_VER 0x02
#define SW_MAJOR 0x01
#define SW_MINOR 0x10
/* Adjust to suit whatever pin your hardware uses to enter the bootloader */
/* ATmega128 has two UARTS so two pins are used to enter bootloader and select UART */
/* BL0... means UART0, BL1... means UART1 */
#ifdef __AVR_ATmega128__
#define BL_DDR DDRF
#define BL_PORT PORTF
#define BL_PIN PINF
#define BL0 PINF7
#define BL1 PINF6
#else
/* other ATmegas have only one UART, so only one pin is defined to enter bootloader */
#define BL_DDR DDRD
#define BL_PORT PORTD
#define BL_PIN PIND
#define BL PIND6
#endif
/* onboard LED is used to indicate, that the bootloader was entered (3x flashing) */
/* if monitor functions are included, LED goes on after monitor was entered */
#ifdef __AVR_ATmega128__
/* Onboard LED is connected to pin PB7 (e.g. Crumb128, PROBOmega128, Savvy128) */
#define LED_DDR DDRB
#define LED_PORT PORTB
#define LED_PIN PINB
#define LED PINB7
#else
/* Onboard LED is connected to pin PB2 (e.g. Crumb8, Crumb168) */
#define LED_DDR DDRB
#define LED_PORT PORTB
#define LED_PIN PINB
/* 20060803: hacked by DojoCorp, LED pin is B5 in Arduino */
/* #define LED PINB2 */
#define LED PINB5
#endif
/* monitor functions will only be compiled when using ATmega128, due to bootblock size constraints */
#ifdef __AVR_ATmega128__
#define MONITOR
#endif
/* define various device id's */
/* manufacturer byte is always the same */
#define SIG1 0x1E // Yep, Atmel is the only manufacturer of AVR micros. Single source :(
#if defined __AVR_ATmega128__
#define SIG2 0x97
#define SIG3 0x02
#define PAGE_SIZE 0x80U //128 words
#elif defined __AVR_ATmega64__
#define SIG2 0x96
#define SIG3 0x02
#define PAGE_SIZE 0x80U //128 words
#elif defined __AVR_ATmega32__
#define SIG2 0x95
#define SIG3 0x02
#define PAGE_SIZE 0x40U //64 words
#elif defined __AVR_ATmega16__
#define SIG2 0x94
#define SIG3 0x03
#define PAGE_SIZE 0x40U //64 words
#elif defined __AVR_ATmega8__
#define SIG2 0x93
#define SIG3 0x07
#define PAGE_SIZE 0x20U //32 words
#elif defined __AVR_ATmega88__
#define SIG2 0x93
#define SIG3 0x0a
#define PAGE_SIZE 0x20U //32 words
#elif defined __AVR_ATmega168__
#define SIG2 0x94
#define SIG3 0x06
#define PAGE_SIZE 0x40U //64 words
#elif defined __AVR_ATmega162__
#define SIG2 0x94
#define SIG3 0x04
#define PAGE_SIZE 0x40U //64 words
#elif defined __AVR_ATmega163__
#define SIG2 0x94
#define SIG3 0x02
#define PAGE_SIZE 0x40U //64 words
#elif defined __AVR_ATmega169__
#define SIG2 0x94
#define SIG3 0x05
#define PAGE_SIZE 0x40U //64 words
#elif defined __AVR_ATmega8515__
#define SIG2 0x93
#define SIG3 0x06
#define PAGE_SIZE 0x20U //32 words
#elif defined __AVR_ATmega8535__
#define SIG2 0x93
#define SIG3 0x08
#define PAGE_SIZE 0x20U //32 words
#endif
/* function prototypes */
void putch(char);
char getch(void);
void getNch(uint8_t);
void byte_response(uint8_t);
void nothing_response(void);
char gethex(void);
void puthex(char);
void flash_led(uint8_t);
/* some variables */
union address_union {
uint16_t word;
uint8_t byte[2];
} address;
union length_union {
uint16_t word;
uint8_t byte[2];
} length;
struct flags_struct {
unsigned eeprom : 1;
unsigned rampz : 1;
} flags;
uint8_t buff[256];
uint8_t address_high;
uint8_t pagesz=0x80;
uint8_t i;
uint8_t bootuart = 0;
uint8_t error_count = 0;
void (*app_start)(void) = 0x0000;
/* main program starts here */
int main(void)
{
uint8_t ch,ch2;
uint16_t w;
#ifdef WATCHDOG_MODS
ch = MCUSR;
MCUSR = 0;
WDTCSR |= _BV(WDCE) | _BV(WDE);
WDTCSR = 0;
// Check if the WDT was used to reset, in which case we dont bootload and skip straight to the code. woot.
if (! (ch & _BV(EXTRF))) // if its a not an external reset...
app_start(); // skip bootloader
#else
asm volatile("nop\n\t");
#endif
/* set pin direction for bootloader pin and enable pullup */
/* for ATmega128, two pins need to be initialized */
#ifdef __AVR_ATmega128__
BL_DDR &= ~_BV(BL0);
BL_DDR &= ~_BV(BL1);
BL_PORT |= _BV(BL0);
BL_PORT |= _BV(BL1);
#else
/* We run the bootloader regardless of the state of this pin. Thus, don't
put it in a different state than the other pins. --DAM, 070709
BL_DDR &= ~_BV(BL);
BL_PORT |= _BV(BL);
*/
#endif
#ifdef __AVR_ATmega128__
/* check which UART should be used for booting */
if(bit_is_clear(BL_PIN, BL0)) {
bootuart = 1;
}
else if(bit_is_clear(BL_PIN, BL1)) {
bootuart = 2;
}
#endif
/* check if flash is programmed already, if not start bootloader anyway */
if(pgm_read_byte_near(0x0000) != 0xFF) {
#ifdef __AVR_ATmega128__
/* no UART was selected, start application */
if(!bootuart) {
app_start();
}
#else
/* check if bootloader pin is set low */
/* we don't start this part neither for the m8, nor m168 */
//if(bit_is_set(BL_PIN, BL)) {
// app_start();
//}
#endif
}
#ifdef __AVR_ATmega128__
/* no bootuart was selected, default to uart 0 */
if(!bootuart) {
bootuart = 1;
}
#endif
/* initialize UART(s) depending on CPU defined */
#ifdef __AVR_ATmega128__
if(bootuart == 1) {
UBRR0L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
UBRR0H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
UCSR0A = 0x00;
UCSR0C = 0x06;
UCSR0B = _BV(TXEN0)|_BV(RXEN0);
}
if(bootuart == 2) {
UBRR1L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
UBRR1H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
UCSR1A = 0x00;
UCSR1C = 0x06;
UCSR1B = _BV(TXEN1)|_BV(RXEN1);
}
#elif defined __AVR_ATmega163__
UBRR = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
UBRRHI = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
UCSRA = 0x00;
UCSRB = _BV(TXEN)|_BV(RXEN);
#elif defined __AVR_ATmega168__
UBRR0L = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
UBRR0H = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
UCSR0B = (1<<RXEN0) | (1<<TXEN0);
UCSR0C = (1<<UCSZ00) | (1<<UCSZ01);
/* Enable internal pull-up resistor on pin D0 (RX), in order
to supress line noise that prevents the bootloader from
timing out (DAM: 20070509) */
DDRD &= ~_BV(PIND0);
PORTD |= _BV(PIND0);
#elif defined __AVR_ATmega8__
/* m8 */
UBRRH = (((F_CPU/BAUD_RATE)/16)-1)>>8; // set baud rate
UBRRL = (((F_CPU/BAUD_RATE)/16)-1);
UCSRB = (1<<RXEN)|(1<<TXEN); // enable Rx & Tx
UCSRC = (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0); // config USART; 8N1
#else
/* m16,m32,m169,m8515,m8535 */
UBRRL = (uint8_t)(F_CPU/(BAUD_RATE*16L)-1);
UBRRH = (F_CPU/(BAUD_RATE*16L)-1) >> 8;
UCSRA = 0x00;
UCSRC = 0x06;
UCSRB = _BV(TXEN)|_BV(RXEN);
#endif
/* set LED pin as output */
LED_DDR |= _BV(LED);
/* flash onboard LED to signal entering of bootloader */
#ifdef __AVR_ATmega128__
// 4x for UART0, 5x for UART1
flash_led(NUM_LED_FLASHES + bootuart);
#else
flash_led(NUM_LED_FLASHES);
#endif
/* 20050803: by DojoCorp, this is one of the parts provoking the
system to stop listening, cancelled from the original */
//putch('\0');
/* forever loop */
for (;;) {
/* get character from UART */
ch = getch();
/* A bunch of if...else if... gives smaller code than switch...case ! */
/* Hello is anyone home ? */
if(ch=='0') {
nothing_response();
}
/* Request programmer ID */
/* Not using PROGMEM string due to boot block in m128 being beyond 64kB boundry */
/* Would need to selectively manipulate RAMPZ, and it's only 9 characters anyway so who cares. */
else if(ch=='1') {
if (getch() == ' ') {
putch(0x14);
putch('A');
putch('V');
putch('R');
putch(' ');
putch('I');
putch('S');
putch('P');
putch(0x10);
} else {
if (++error_count == MAX_ERROR_COUNT)
app_start();
}
}
/* AVR ISP/STK500 board commands DON'T CARE so default nothing_response */
else if(ch=='@') {
ch2 = getch();
if (ch2>0x85) getch();
nothing_response();
}
/* AVR ISP/STK500 board requests */
else if(ch=='A') {
ch2 = getch();
if(ch2==0x80) byte_response(HW_VER); // Hardware version
else if(ch2==0x81) byte_response(SW_MAJOR); // Software major version
else if(ch2==0x82) byte_response(SW_MINOR); // Software minor version
else if(ch2==0x98) byte_response(0x03); // Unknown but seems to be required by avr studio 3.56
else byte_response(0x00); // Covers various unnecessary responses we don't care about
}
/* Device Parameters DON'T CARE, DEVICE IS FIXED */
else if(ch=='B') {
getNch(20);
nothing_response();
}
/* Parallel programming stuff DON'T CARE */
else if(ch=='E') {
getNch(5);
nothing_response();
}
/* Enter programming mode */
else if(ch=='P') {
nothing_response();
}
/* Leave programming mode */
else if(ch=='Q') {
nothing_response();
#ifdef WATCHDOG_MODS
// autoreset via watchdog (sneaky!)
WDTCSR = _BV(WDE);
while (1); // 16 ms
#endif
}
/* Erase device, don't care as we will erase one page at a time anyway. */
else if(ch=='R') {
nothing_response();
}
/* Set address, little endian. EEPROM in bytes, FLASH in words */
/* Perhaps extra address bytes may be added in future to support > 128kB FLASH. */
/* This might explain why little endian was used here, big endian used everywhere else. */
else if(ch=='U') {
address.byte[0] = getch();
address.byte[1] = getch();
nothing_response();
}
/* Universal SPI programming command, disabled. Would be used for fuses and lock bits. */
else if(ch=='V') {
getNch(4);
byte_response(0x00);
}
/* Write memory, length is big endian and is in bytes */
else if(ch=='d') {
length.byte[1] = getch();
length.byte[0] = getch();
flags.eeprom = 0;
if (getch() == 'E') flags.eeprom = 1;
for (w=0;w<length.word;w++) {
buff[w] = getch(); // Store data in buffer, can't keep up with serial data stream whilst programming pages
}
if (getch() == ' ') {
if (flags.eeprom) { //Write to EEPROM one byte at a time
for(w=0;w<length.word;w++) {
#ifdef __AVR_ATmega168__
while(EECR & (1<<EEPE));
EEAR = (uint16_t)(void *)address.word;
EEDR = buff[w];
EECR |= (1<<EEMPE);
EECR |= (1<<EEPE);
#else
eeprom_write_byte((void *)address.word,buff[w]);
#endif
address.word++;
}
}
else { //Write to FLASH one page at a time
if (address.byte[1]>127) address_high = 0x01; //Only possible with m128, m256 will need 3rd address byte. FIXME
else address_high = 0x00;
#ifdef __AVR_ATmega128__
RAMPZ = address_high;
#endif
address.word = address.word << 1; //address * 2 -> byte location
/* if ((length.byte[0] & 0x01) == 0x01) length.word++; //Even up an odd number of bytes */
if ((length.byte[0] & 0x01)) length.word++; //Even up an odd number of bytes
cli(); //Disable interrupts, just to be sure
// HACKME: EEPE used to be EEWE
while(bit_is_set(EECR,EEPE)); //Wait for previous EEPROM writes to complete
asm volatile(
"clr r17 \n\t" //page_word_count
"lds r30,address \n\t" //Address of FLASH location (in bytes)
"lds r31,address+1 \n\t"
"ldi r28,lo8(buff) \n\t" //Start of buffer array in RAM
"ldi r29,hi8(buff) \n\t"
"lds r24,length \n\t" //Length of data to be written (in bytes)
"lds r25,length+1 \n\t"
"length_loop: \n\t" //Main loop, repeat for number of words in block
"cpi r17,0x00 \n\t" //If page_word_count=0 then erase page
"brne no_page_erase \n\t"
"wait_spm1: \n\t"
"lds r16,%0 \n\t" //Wait for previous spm to complete
"andi r16,1 \n\t"
"cpi r16,1 \n\t"
"breq wait_spm1 \n\t"
"ldi r16,0x03 \n\t" //Erase page pointed to by Z
"sts %0,r16 \n\t"
"spm \n\t"
#ifdef __AVR_ATmega163__
".word 0xFFFF \n\t"
"nop \n\t"
#endif
"wait_spm2: \n\t"
"lds r16,%0 \n\t" //Wait for previous spm to complete
"andi r16,1 \n\t"
"cpi r16,1 \n\t"
"breq wait_spm2 \n\t"
"ldi r16,0x11 \n\t" //Re-enable RWW section
"sts %0,r16 \n\t"
"spm \n\t"
#ifdef __AVR_ATmega163__
".word 0xFFFF \n\t"
"nop \n\t"
#endif
"no_page_erase: \n\t"
"ld r0,Y+ \n\t" //Write 2 bytes into page buffer
"ld r1,Y+ \n\t"
"wait_spm3: \n\t"
"lds r16,%0 \n\t" //Wait for previous spm to complete
"andi r16,1 \n\t"
"cpi r16,1 \n\t"
"breq wait_spm3 \n\t"
"ldi r16,0x01 \n\t" //Load r0,r1 into FLASH page buffer
"sts %0,r16 \n\t"
"spm \n\t"
"inc r17 \n\t" //page_word_count++
"cpi r17,%1 \n\t"
"brlo same_page \n\t" //Still same page in FLASH
"write_page: \n\t"
"clr r17 \n\t" //New page, write current one first
"wait_spm4: \n\t"
"lds r16,%0 \n\t" //Wait for previous spm to complete
"andi r16,1 \n\t"
"cpi r16,1 \n\t"
"breq wait_spm4 \n\t"
#ifdef __AVR_ATmega163__
"andi r30,0x80 \n\t" // m163 requires Z6:Z1 to be zero during page write
#endif
"ldi r16,0x05 \n\t" //Write page pointed to by Z
"sts %0,r16 \n\t"
"spm \n\t"
#ifdef __AVR_ATmega163__
".word 0xFFFF \n\t"
"nop \n\t"
"ori r30,0x7E \n\t" // recover Z6:Z1 state after page write (had to be zero during write)
#endif
"wait_spm5: \n\t"
"lds r16,%0 \n\t" //Wait for previous spm to complete
"andi r16,1 \n\t"
"cpi r16,1 \n\t"
"breq wait_spm5 \n\t"
"ldi r16,0x11 \n\t" //Re-enable RWW section
"sts %0,r16 \n\t"
"spm \n\t"
#ifdef __AVR_ATmega163__
".word 0xFFFF \n\t"
"nop \n\t"
#endif
"same_page: \n\t"
"adiw r30,2 \n\t" //Next word in FLASH
"sbiw r24,2 \n\t" //length-2
"breq final_write \n\t" //Finished
"rjmp length_loop \n\t"
"final_write: \n\t"
"cpi r17,0 \n\t"
"breq block_done \n\t"
"adiw r24,2 \n\t" //length+2, fool above check on length after short page write
"rjmp write_page \n\t"
"block_done: \n\t"
"clr __zero_reg__ \n\t" //restore zero register
#if defined __AVR_ATmega168__
: "=m" (SPMCSR) : "M" (PAGE_SIZE) : "r0","r16","r17","r24","r25","r28","r29","r30","r31"
#else
: "=m" (SPMCR) : "M" (PAGE_SIZE) : "r0","r16","r17","r24","r25","r28","r29","r30","r31"
#endif
);
/* Should really add a wait for RWW section to be enabled, don't actually need it since we never */
/* exit the bootloader without a power cycle anyhow */
}
putch(0x14);
putch(0x10);
} else {
if (++error_count == MAX_ERROR_COUNT)
app_start();
}
}
/* Read memory block mode, length is big endian. */
else if(ch=='t') {
length.byte[1] = getch();
length.byte[0] = getch();
#if defined __AVR_ATmega128__
if (address.word>0x7FFF) flags.rampz = 1; // No go with m256, FIXME
else flags.rampz = 0;
#endif
if (getch() == 'E') flags.eeprom = 1;
else {
flags.eeprom = 0;
address.word = address.word << 1; // address * 2 -> byte location
}
if (getch() == ' ') { // Command terminator
putch(0x14);
for (w=0;w < length.word;w++) { // Can handle odd and even lengths okay
if (flags.eeprom) { // Byte access EEPROM read
#ifdef __AVR_ATmega168__
while(EECR & (1<<EEPE));
EEAR = (uint16_t)(void *)address.word;
EECR |= (1<<EERE);
putch(EEDR);
#else
putch(eeprom_read_byte((void *)address.word));
#endif
address.word++;
}
else {
if (!flags.rampz) putch(pgm_read_byte_near(address.word));
#if defined __AVR_ATmega128__
else putch(pgm_read_byte_far(address.word + 0x10000));
// Hmmmm, yuck FIXME when m256 arrvies
#endif
address.word++;
}
}
putch(0x10);
}
}
/* Get device signature bytes */
else if(ch=='u') {
if (getch() == ' ') {
putch(0x14);
putch(SIG1);
putch(SIG2);
putch(SIG3);
putch(0x10);
} else {
if (++error_count == MAX_ERROR_COUNT)
app_start();
}
}
/* Read oscillator calibration byte */
else if(ch=='v') {
byte_response(0x00);
}
#ifdef MONITOR
/* here come the extended monitor commands by Erik Lins */
/* check for three times exclamation mark pressed */
else if(ch=='!') {
ch = getch();
if(ch=='!') {
ch = getch();
if(ch=='!') {
#ifdef __AVR_ATmega128__
uint16_t extaddr;
#endif
uint8_t addrl, addrh;
#ifdef CRUMB128
PGM_P welcome = {"ATmegaBOOT / Crumb128 - (C) J.P.Kyle, E.Lins - 050815\n\r"};
#elif defined PROBOMEGA128
PGM_P welcome = {"ATmegaBOOT / PROBOmega128 - (C) J.P.Kyle, E.Lins - 050815\n\r"};
#elif defined SAVVY128
PGM_P welcome = {"ATmegaBOOT / Savvy128 - (C) J.P.Kyle, E.Lins - 050815\n\r"};
#endif
/* turn on LED */
LED_DDR |= _BV(LED);
LED_PORT &= ~_BV(LED);
/* print a welcome message and command overview */
for(i=0; welcome[i] != '\0'; ++i) {
putch(welcome[i]);
}
/* test for valid commands */
for(;;) {
putch('\n');
putch('\r');
putch(':');
putch(' ');
ch = getch();
putch(ch);
/* toggle LED */
if(ch == 't') {
if(bit_is_set(LED_PIN,LED)) {
LED_PORT &= ~_BV(LED);
putch('1');
} else {
LED_PORT |= _BV(LED);
putch('0');
}
}
/* read byte from address */
else if(ch == 'r') {
ch = getch(); putch(ch);
addrh = gethex();
addrl = gethex();
putch('=');
ch = *(uint8_t *)((addrh << 8) + addrl);
puthex(ch);
}
/* write a byte to address */
else if(ch == 'w') {
ch = getch(); putch(ch);
addrh = gethex();
addrl = gethex();
ch = getch(); putch(ch);
ch = gethex();
*(uint8_t *)((addrh << 8) + addrl) = ch;
}
/* read from uart and echo back */
else if(ch == 'u') {
for(;;) {
putch(getch());
}
}
#ifdef __AVR_ATmega128__
/* external bus loop */
else if(ch == 'b') {
putch('b');
putch('u');
putch('s');
MCUCR = 0x80;
XMCRA = 0;
XMCRB = 0;
extaddr = 0x1100;
for(;;) {
ch = *(volatile uint8_t *)extaddr;
if(++extaddr == 0) {
extaddr = 0x1100;
}
}
}
#endif
else if(ch == 'j') {
app_start();
}
} /* end of monitor functions */
}
}
}
/* end of monitor */
#endif
else if (++error_count == MAX_ERROR_COUNT) {
app_start();
}
} /* end of forever loop */
}
char gethex(void) {
char ah,al;
ah = getch(); putch(ah);
al = getch(); putch(al);
if(ah >= 'a') {
ah = ah - 'a' + 0x0a;
} else if(ah >= '0') {
ah -= '0';
}
if(al >= 'a') {
al = al - 'a' + 0x0a;
} else if(al >= '0') {
al -= '0';
}
return (ah << 4) + al;
}
void puthex(char ch) {
char ah,al;
ah = (ch & 0xf0) >> 4;
if(ah >= 0x0a) {
ah = ah - 0x0a + 'a';
} else {
ah += '0';
}
al = (ch & 0x0f);
if(al >= 0x0a) {
al = al - 0x0a + 'a';
} else {
al += '0';
}
putch(ah);
putch(al);
}
void putch(char ch)
{
#ifdef __AVR_ATmega128__
if(bootuart == 1) {
while (!(UCSR0A & _BV(UDRE0)));
UDR0 = ch;
}
else if (bootuart == 2) {
while (!(UCSR1A & _BV(UDRE1)));
UDR1 = ch;
}
#elif defined __AVR_ATmega168__
while (!(UCSR0A & _BV(UDRE0)));
UDR0 = ch;
#else
/* m8,16,32,169,8515,8535,163 */
while (!(UCSRA & _BV(UDRE)));
UDR = ch;
#endif
}
char getch(void)
{
#ifdef __AVR_ATmega128__
if(bootuart == 1) {
while(!(UCSR0A & _BV(RXC0)));
return UDR0;
}
else if(bootuart == 2) {
while(!(UCSR1A & _BV(RXC1)));
return UDR1;
}
return 0;
#elif defined __AVR_ATmega168__
uint32_t count = 0;
while(!(UCSR0A & _BV(RXC0))){
/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/
/* HACKME:: here is a good place to count times*/
count++;
if (count > MAX_TIME_COUNT)
app_start();
}
return UDR0;
#else
/* m8,16,32,169,8515,8535,163 */
uint32_t count = 0;
while(!(UCSRA & _BV(RXC))){
/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/
/* HACKME:: here is a good place to count times*/
count++;
if (count > MAX_TIME_COUNT)
app_start();
}
return UDR;
#endif
}
void getNch(uint8_t count)
{
uint8_t i;
for(i=0;i<count;i++) {
#ifdef __AVR_ATmega128__
if(bootuart == 1) {
while(!(UCSR0A & _BV(RXC0)));
UDR0;
}
else if(bootuart == 2) {
while(!(UCSR1A & _BV(RXC1)));
UDR1;
}
#elif defined __AVR_ATmega168__
while(!(UCSR0A & _BV(RXC0)));
UDR0;
#else
/* m8,16,32,169,8515,8535,163 */
/* 20060803 DojoCorp:: Addon coming from the previous Bootloader*/
//while(!(UCSRA & _BV(RXC)));
//UDR;
uint8_t i;
for(i=0;i<count;i++) {
getch(); // need to handle time out
}
#endif
}
}
void byte_response(uint8_t val)
{
if (getch() == ' ') {
putch(0x14);
putch(val);
putch(0x10);
} else {
if (++error_count == MAX_ERROR_COUNT)
app_start();
}
}
void nothing_response(void)
{
if (getch() == ' ') {
putch(0x14);
putch(0x10);
} else {
if (++error_count == MAX_ERROR_COUNT)
app_start();
}
}
void flash_led(uint8_t count)
{
/* flash onboard LED three times to signal entering of bootloader */
/* l needs to be volatile or the delay loops below might get
optimized away if compiling with optimizations (DAM). */
volatile uint32_t l;
if (count == 0) {
count = 3;
}
for (i = 0; i < count; ++i) {
LED_PORT |= _BV(LED);
for(l = 0; l < (F_CPU / 1000); ++l);
LED_PORT &= ~_BV(LED);
for(l = 0; l < (F_CPU / 1000); ++l);
}
}
/* end of file ATmegaBOOT.c */
|