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[pub/USBaspLoader.git] / firmware / main.c
1 /* Name: main.c
2 * Project: USBaspLoader
3 * Author: Christian Starkjohann
4 * Author: Stephan Baerwolf
5 * Creation Date: 2007-12-08
6 * Modification Date: 2012-11-10
7 * Tabsize: 4
8 * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
9 * License: GNU GPL v2 (see License.txt)
10 * This Revision: $Id: main.c 786 2010-05-30 20:41:40Z cs $
11 */
12
13 #include "spminterface.h" /* must be included as first! */
14
15 #include <avr/io.h>
16 #include <avr/interrupt.h>
17 #include <avr/pgmspace.h>
18 #include <avr/wdt.h>
19 #include <avr/boot.h>
20 #include <avr/eeprom.h>
21 #include <util/delay.h>
22
23
24 #if 0
25 /*
26 * 29.09.2012 / 30.09.2012
27 *
28 * Since cpufunc.h is not needed in this context and
29 * since it is not available in all toolchains, this include
30 * becomes deactivated by github issue-report.
31 * (In case of trouble it remains in sourcecode for reactivation.)
32 *
33 * The autor would like to thank Lena-M for reporting this
34 * issue (https://github.com/baerwolf/USBaspLoader/issues/1).
35 */
36 #include <avr/cpufunc.h>
37 #endif
38
39 #include <avr/boot.h>
40
41 #include <string.h>
42
43
44
45 #include "bootloaderconfig.h"
46 #include "usbdrv/usbdrv.c"
47
48 #ifndef BOOTLOADER_ADDRESS
49 #error need to know the bootloaders flash address!
50 #endif
51 #define BOOTLOADER_PAGEADDR (BOOTLOADER_ADDRESS - (BOOTLOADER_ADDRESS % SPM_PAGESIZE))
52
53 /* ------------------------------------------------------------------------ */
54
55 /* Request constants used by USBasp */
56 #define USBASP_FUNC_CONNECT 1
57 #define USBASP_FUNC_DISCONNECT 2
58 #define USBASP_FUNC_TRANSMIT 3
59 #define USBASP_FUNC_READFLASH 4
60 #define USBASP_FUNC_ENABLEPROG 5
61 #define USBASP_FUNC_WRITEFLASH 6
62 #define USBASP_FUNC_READEEPROM 7
63 #define USBASP_FUNC_WRITEEEPROM 8
64 #define USBASP_FUNC_SETLONGADDRESS 9
65
66 // additional USBasp Commands
67 #define USBASP_FUNC_SETISPSCK 10
68 #define USBASP_FUNC_TPI_CONNECT 11
69 #define USBASP_FUNC_TPI_DISCONNECT 12
70 #define USBASP_FUNC_TPI_RAWREAD 13
71 #define USBASP_FUNC_TPI_RAWWRITE 14
72 #define USBASP_FUNC_TPI_READBLOCK 15
73 #define USBASP_FUNC_TPI_WRITEBLOCK 16
74 #define USBASP_FUNC_GETCAPABILITIES 127
75 /* ------------------------------------------------------------------------ */
76
77 #ifndef ulong
78 # define ulong unsigned long
79 #endif
80 #ifndef uint
81 # define uint unsigned int
82 #endif
83
84
85 /* allow compatibility with avrusbboot's bootloaderconfig.h: */
86 #ifdef BOOTLOADER_INIT
87 # define bootLoaderInit() BOOTLOADER_INIT
88 # define bootLoaderExit()
89 #endif
90 #ifdef BOOTLOADER_CONDITION
91 # define bootLoaderCondition() BOOTLOADER_CONDITION
92 #endif
93
94 /* device compatibility: */
95 #ifndef GICR /* ATMega*8 don't have GICR, use MCUCR instead */
96 # define GICR MCUCR
97 #endif
98
99 /* ------------------------------------------------------------------------ */
100
101 #if (FLASHEND) > 0xffff /* we need long addressing */
102 # define CURRENT_ADDRESS currentAddress.l
103 # define addr_t ulong
104 #else
105 # define CURRENT_ADDRESS currentAddress.w[0]
106 # define addr_t uint
107 #endif
108
109 typedef union longConverter{
110 addr_t l;
111 uint w[sizeof(addr_t)/2];
112 uchar b[sizeof(addr_t)];
113 }longConverter_t;
114
115
116 #if BOOTLOADER_CAN_EXIT
117 static volatile unsigned char stayinloader = 0xfe;
118 #endif
119
120 static longConverter_t currentAddress; /* in bytes */
121 static uchar bytesRemaining;
122 static uchar isLastPage;
123 #if HAVE_EEPROM_PAGED_ACCESS
124 static uchar currentRequest;
125 #else
126 static const uchar currentRequest = 0;
127 #endif
128
129 static const uchar signatureBytes[4] = {
130 #ifdef SIGNATURE_BYTES
131 SIGNATURE_BYTES
132 #elif defined (__AVR_ATmega8__) || defined (__AVR_ATmega8A__) || defined (__AVR_ATmega8HVA__)
133 0x1e, 0x93, 0x07, 0
134 #elif defined (__AVR_ATmega32__)
135 0x1e, 0x95, 0x02, 0
136 #elif defined (__AVR_ATmega48__) || defined (__AVR_ATmega48A__) || defined (__AVR_ATmega48P__)
137 #error ATmega48 does not support bootloaders!
138 0x1e, 0x92, 0x05, 0
139 #elif defined (__AVR_ATmega48PA__)
140 #error ATmega48 does not support bootloaders!
141 0x1e, 0x92, 0x0A, 0
142 #elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega88A__) || defined (__AVR_ATmega88P__)
143 0x1e, 0x93, 0x0a, 0
144 #elif defined (__AVR_ATmega88PA__)
145 0x1e, 0x93, 0x0F, 0
146 #elif defined (__AVR_ATmega164A__)
147 0x1e, 0x94, 0x0f, 0
148 #elif defined (__AVR_ATmega164P__) || defined (__AVR_ATmega164PA__)
149 0x1e, 0x94, 0x0a, 0
150 #elif defined (__AVR_ATmega168__) || defined (__AVR_ATmega168A__) || defined (__AVR_ATmega168P__)
151 0x1e, 0x94, 0x06, 0
152 #elif defined (__AVR_ATmega168PA__)
153 0x1e, 0x94, 0x0B, 0
154 #elif defined (__AVR_ATmega324A__)
155 0x1e, 0x95, 0x15, 0
156 #elif defined (__AVR_ATmega324P__)
157 0x1e, 0x95, 0x08, 0
158 #elif defined (__AVR_ATmega324PA__)
159 0x1e, 0x95, 0x11, 0
160 #elif defined (__AVR_ATmega328__)
161 0x1e, 0x95, 0x14, 0
162 #elif defined (__AVR_ATmega328P__)
163 0x1e, 0x95, 0x0f, 0
164 #elif defined (__AVR_ATmega644__) || defined (__AVR_ATmega644A__)
165 0x1e, 0x96, 0x09, 0
166 #elif defined (__AVR_ATmega644P__) || defined (__AVR_ATmega644PA__)
167 0x1e, 0x96, 0x0a, 0
168 #elif defined (__AVR_ATmega128__)
169 0x1e, 0x97, 0x02, 0
170 #elif defined (__AVR_ATmega1284__)
171 0x1e, 0x97, 0x06, 0
172 #elif defined (__AVR_ATmega1284P__)
173 0x1e, 0x97, 0x05, 0
174 #else
175 # error "Device signature is not known, please edit main.c!"
176 #endif
177 };
178
179 /* ------------------------------------------------------------------------ */
180
181 #if (USE_BOOTUP_CLEARRAM)
182 /*
183 * Under normal circumstances, RESET will not clear contents of RAM.
184 * As always, if you want it done - do it yourself...
185 */
186 void __attribute__ ((naked)) __attribute__ ((section (".init3"))) __clearram(void);
187 void __clearram(void) {
188 extern size_t __bss_end;
189 asm volatile (
190 "__clearram:\n\t"
191 "ldi r29, %[ramendhi]\n\t"
192 "ldi r28, %[ramendlo]\n\t"
193 "__clearramloop%=:\n\t"
194 "st -Y , __zero_reg__\n\t"
195 "cp r28, %A[bssend]\n\t"
196 "cpc r29, %B[bssend]\n\t"
197 "brne __clearramloop%=\n\t"
198 :
199 : [ramendhi] "M" (((RAMEND+1)>>8) & 0xff),
200 [ramendlo] "M" (((RAMEND+1)>>0) & 0xff),
201 [bssend] "r" (&__bss_end)
202 : "memory"
203 );
204 }
205 #endif
206
207 #if (!USE_EXCESSIVE_ASSEMBLER) || (!(defined (__AVR_ATmega8__) || defined (__AVR_ATmega8A__) || defined (__AVR_ATmega8HVA__)))
208 static void (*nullVector)(void) __attribute__((__noreturn__));
209 #endif
210
211 static void __attribute__((__noreturn__)) leaveBootloader()
212 {
213 #if (USE_EXCESSIVE_ASSEMBLER) && (defined (__AVR_ATmega8__) || defined (__AVR_ATmega8A__) || defined (__AVR_ATmega8HVA__))
214 asm volatile (
215 "cli\n\t"
216 "clr r30\n\t"
217 "sbi %[usbddr], %[usbminus]\n\t"
218 "cbi %[port], %[bit]\n\t"
219 "out %[usbintrenab], r30\n\t"
220 "out %[usbintrcfg], r30\n\t"
221 "ldi r31, %[ivce]\n\t"
222 "out %[mygicr], r31\n\t"
223 "out %[mygicr], r30\n\t"
224 "clr r31\n\t"
225 "icall\n\t"
226 :
227 : [port] "I" (_SFR_IO_ADDR(PIN_PORT(JUMPER_PORT))),
228 [bit] "I" (PIN(JUMPER_PORT, JUMPER_BIT)),
229 [usbintrenab] "I" (_SFR_IO_ADDR(USB_INTR_ENABLE)),
230 [usbintrcfg] "I" (_SFR_IO_ADDR(USB_INTR_CFG)),
231 [usbddr] "I" (_SFR_IO_ADDR(USBDDR)),
232 [usbminus] "I" (USBMINUS),
233 [mygicr] "I" (_SFR_IO_ADDR(GICR)),
234 [ivce] "I" (1<<IVCE)
235 );
236 /* TODO: compiler will put an unnecessary "ret" at this end ! */
237 #else
238 DBG1(0x01, 0, 0);
239 cli();
240 usbDeviceDisconnect();
241 bootLoaderExit();
242 USB_INTR_ENABLE = 0;
243 USB_INTR_CFG = 0; /* also reset config bits */
244 GICR = (1 << IVCE); /* enable change of interrupt vectors */
245 GICR = (0 << IVSEL); /* move interrupts to application flash section */
246
247 /* We must go through a global function pointer variable instead of writing
248 * ((void (*)(void))0)();
249 * because the compiler optimizes a constant 0 to "rcall 0" which is not
250 * handled correctly by the assembler.
251 */
252 nullVector();
253 #endif
254 }
255
256 /* ------------------------------------------------------------------------ */
257
258
259 uchar usbFunctionSetup_USBASP_FUNC_TRANSMIT(usbRequest_t *rq) {
260 uchar rval = 0;
261 usbWord_t address;
262 address.bytes[1] = rq->wValue.bytes[1];
263 address.bytes[0] = rq->wIndex.bytes[0];
264
265 if(rq->wValue.bytes[0] == 0x30){ /* read signature */
266 rval = rq->wIndex.bytes[0] & 3;
267 rval = signatureBytes[rval];
268 #if HAVE_READ_LOCK_FUSE
269 #if defined (__AVR_ATmega8__) || defined (__AVR_ATmega8A__) || defined (__AVR_ATmega32__)
270 }else if(rq->wValue.bytes[0] == 0x58 && rq->wValue.bytes[1] == 0x00){ /* read lock bits */
271 rval = boot_lock_fuse_bits_get(GET_LOCK_BITS);
272 }else if(rq->wValue.bytes[0] == 0x50 && rq->wValue.bytes[1] == 0x00){ /* read lfuse bits */
273 rval = boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS);
274 }else if(rq->wValue.bytes[0] == 0x58 && rq->wValue.bytes[1] == 0x08){ /* read hfuse bits */
275 rval = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
276
277 #elif defined (__AVR_ATmega48__) || defined (__AVR_ATmega48A__) || defined (__AVR_ATmega48P__) || defined (__AVR_ATmega48PA__) || \
278 defined (__AVR_ATmega88__) || defined (__AVR_ATmega88A__) || defined (__AVR_ATmega88P__) || defined (__AVR_ATmega88PA__) || \
279 defined (__AVR_ATmega164A__) || defined (__AVR_ATmega164P__) || \
280 defined (__AVR_ATmega168__) || defined (__AVR_ATmega168A__) || defined (__AVR_ATmega168P__) || defined (__AVR_ATmega168PA__) || \
281 defined (__AVR_ATmega324A__) || defined (__AVR_ATmega324P__) || \
282 defined (__AVR_ATmega328__) || defined (__AVR_ATmega328P__) || \
283 defined (__AVR_ATmega644__) || defined (__AVR_ATmega644A__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega644PA__) || \
284 defined (__AVR_ATmega128__) || \
285 defined (__AVR_ATmega1284__) || defined (__AVR_ATmega1284P__)
286 }else if(rq->wValue.bytes[0] == 0x58 && rq->wValue.bytes[1] == 0x00){ /* read lock bits */
287 rval = boot_lock_fuse_bits_get(GET_LOCK_BITS);
288 }else if(rq->wValue.bytes[0] == 0x50 && rq->wValue.bytes[1] == 0x00){ /* read lfuse bits */
289 rval = boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS);
290 }else if(rq->wValue.bytes[0] == 0x58 && rq->wValue.bytes[1] == 0x08){ /* read hfuse bits */
291 rval = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
292 }else if(rq->wValue.bytes[0] == 0x50 && rq->wValue.bytes[1] == 0x08){ /* read efuse bits */
293 rval = boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS );
294 #else
295 #warning "HAVE_READ_LOCK_FUSE is activated but MCU unknown -> will not support this feature"
296 #endif
297 #endif
298 #if HAVE_FLASH_BYTE_READACCESS
299 }else if(rq->wValue.bytes[0] == 0x20){ /* read FLASH low byte */
300 #if ((FLASHEND) > 65535)
301 rval = pgm_read_byte_far((((addr_t)address.word)<<1)+0);
302 #else
303 rval = pgm_read_byte((((addr_t)address.word)<<1)+0);
304 #endif
305 }else if(rq->wValue.bytes[0] == 0x28){ /* read FLASH high byte */
306 #if ((FLASHEND) > 65535)
307 rval = pgm_read_byte_far((((addr_t)address.word)<<1)+1);
308 #else
309 rval = pgm_read_byte((((addr_t)address.word)<<1)+1);
310 #endif
311 #endif
312 #if HAVE_EEPROM_BYTE_ACCESS
313 }else if(rq->wValue.bytes[0] == 0xa0){ /* read EEPROM byte */
314 rval = eeprom_read_byte((void *)address.word);
315 }else if(rq->wValue.bytes[0] == 0xc0){ /* write EEPROM byte */
316 eeprom_write_byte((void *)address.word, rq->wIndex.bytes[1]);
317 #endif
318 #if HAVE_CHIP_ERASE
319 }else if(rq->wValue.bytes[0] == 0xac && rq->wValue.bytes[1] == 0x80){ /* chip erase */
320 addr_t addr;
321 #if HAVE_BLB11_SOFTW_LOCKBIT
322 for(addr = 0; addr < (addr_t)(BOOTLOADER_PAGEADDR) ; addr += SPM_PAGESIZE) {
323 #else
324 for(addr = 0; addr <= (addr_t)(FLASHEND) ; addr += SPM_PAGESIZE) {
325 #endif
326 /* wait and erase page */
327 DBG1(0x33, 0, 0);
328 # ifndef NO_FLASH_WRITE
329 boot_spm_busy_wait();
330 cli();
331 boot_page_erase(addr);
332 sei();
333 # endif
334 }
335 #endif
336 }else{
337 /* ignore all others, return default value == 0 */
338 }
339
340 return rval;
341 }
342
343
344 uchar usbFunctionSetup(uchar data[8])
345 {
346 usbRequest_t *rq = (void *)data;
347 uchar len = 0;
348 static uchar replyBuffer[4];
349
350 usbMsgPtr = replyBuffer;
351 if(rq->bRequest == USBASP_FUNC_TRANSMIT){ /* emulate parts of ISP protocol */
352 replyBuffer[3] = usbFunctionSetup_USBASP_FUNC_TRANSMIT(rq);
353 len = 4;
354 }else if((rq->bRequest == USBASP_FUNC_ENABLEPROG) || (rq->bRequest == USBASP_FUNC_SETISPSCK)){
355 /* replyBuffer[0] = 0; is never touched and thus always 0 which means success */
356 len = 1;
357 }else if(rq->bRequest >= USBASP_FUNC_READFLASH && rq->bRequest <= USBASP_FUNC_SETLONGADDRESS){
358 currentAddress.w[0] = rq->wValue.word;
359 if(rq->bRequest == USBASP_FUNC_SETLONGADDRESS){
360 #if (FLASHEND) > 0xffff
361 currentAddress.w[1] = rq->wIndex.word;
362 #endif
363 }else{
364 bytesRemaining = rq->wLength.bytes[0];
365 /* if(rq->bRequest == USBASP_FUNC_WRITEFLASH) only evaluated during writeFlash anyway */
366 isLastPage = rq->wIndex.bytes[1] & 0x02;
367 #if HAVE_EEPROM_PAGED_ACCESS
368 currentRequest = rq->bRequest;
369 #endif
370 len = 0xff; /* hand over to usbFunctionRead() / usbFunctionWrite() */
371 }
372
373 }else if(rq->bRequest == USBASP_FUNC_DISCONNECT){
374
375 #if BOOTLOADER_CAN_EXIT
376 stayinloader &= (0xfe);
377 #endif
378 }else{
379 /* ignore: others, but could be USBASP_FUNC_CONNECT */
380 #if BOOTLOADER_CAN_EXIT
381 stayinloader |= (0x01);
382 #endif
383 }
384 return len;
385 }
386
387 #if (USE_EXCESSIVE_ASSEMBLER) && ((!HAVE_CHIP_ERASE) || (HAVE_ONDEMAND_PAGEERASE)) && (SPM_PAGESIZE <= 256) && (((BOOTLOADER_PAGEADDR>>0)&0xff) == 0)
388 uchar usbFunctionWrite(uchar *data, uchar len)
389 {
390 uchar isLast;
391
392 DBG1(0x31, (void *)&currentAddress.l, 4);
393 if(len > bytesRemaining)
394 len = bytesRemaining;
395 bytesRemaining -= len;
396 isLast = bytesRemaining == 0;
397 if(currentRequest >= USBASP_FUNC_READEEPROM){
398 uchar i;
399 for(i = 0; i < len; i++){
400 eeprom_write_byte((void *)(currentAddress.w[0]++), *data++);
401 }
402 }else{
403 asm volatile (
404 "sbrc %[len], 0\n\t"
405 "inc %[len]\n\t"
406 "usbFunctionWrite_flashloop:\n\t"
407 "subi %[len], 2\n\t"
408 "brlo usbFunctionWrite_finished\n\t"
409
410 #if HAVE_BLB11_SOFTW_LOCKBIT
411 "cpi r31, %[blsaddrhi]\n\t" /* accelerated BLB11_SOFTW_LOCKBIT check */
412 "brsh usbFunctionWrite_finished\n\t"
413 // "brlo usbFunctionWrite_addrunlock_ok\n\t"
414 // "brne usbFunctionWrite_finished\n\t"
415 // "cpi r30, %[blsaddrlo]\n\t"
416 // "brlo usbFunctionWrite_addrunlock_ok\n\t"
417 // "rjmp usbFunctionWrite_finished\n\t"
418 // "usbFunctionWrite_addrunlock_ok:\n\t"
419 #endif
420 "rcall usbFunctionWrite_waitA\n\t"
421 "cli\n\t" /* r0 or r1 may be __zero_reg__ and may become dangerous nonzero within interrupts */
422 "ld r0, X+\n\t"
423 "ld r1, X+\n\t"
424
425 "ldi r18, %[pagfillval]\n\t"
426 "rcall usbFunctionWrite_saveflash\n\t" /* page fill */
427
428 "mov r18, r30\n\t"
429 "subi r18, 0xfe\n\t" /* add with 2 */
430 "andi r18, %[pagemask]\n\t"
431 "breq usbFunctionWrite_pageisfull\n\t"
432 "tst %[islast]\n\t"
433 "breq usbFunctionWrite_skippageisfull\n\t"
434 "tst %[isLastPage]\n\t"
435 "breq usbFunctionWrite_skippageisfull\n\t"
436 "cpi %[len], 0\n\t"
437 "brne usbFunctionWrite_skippageisfull\n\t"
438
439 "usbFunctionWrite_pageisfull:\n\t" /* start writing the page */
440 "ldi r18, %[pageraseval]\n\t"
441 "rcall usbFunctionWrite_saveflash\n\t" /* page erase */
442 "rcall usbFunctionWrite_waitA\n\t"
443
444 "ldi r18, %[pagwriteval]\n\t"
445 "rcall usbFunctionWrite_saveflash\n\t" /* page write */
446 "rcall usbFunctionWrite_waitA\n\t"
447
448 "in __tmp_reg__, %[spmcr]\n\t"
449 "sbrs __tmp_reg__, %[rwwsbbit]\n\t"
450 "rjmp usbFunctionWrite_skippageisfull\n\t"
451 "ldi r18, %[rwwenrval]\n\t"
452 "rcall usbFunctionWrite_saveflash\n\t" /* reenable rww*/
453 // "rcall usbFunctionWrite_waitA\n\t"
454
455
456 "usbFunctionWrite_skippageisfull:\n\t"
457 "adiw r30, 0x2\n\t"
458 "rjmp usbFunctionWrite_flashloop\n\t"
459
460 "usbFunctionWrite_saveflash:\n\t"
461 "cli\n\t"
462 "out %[spmcr], r18\n\t"
463 "spm\n\t"
464 "clr __zero_reg__\n\t" /* if r0 or r1 is __zero_reg__ it may have become inconsisten while page-fill */
465 "sei\n\t"
466 "ret\n\t"
467
468 "usbFunctionWrite_waitA:\n\t"
469 "in __tmp_reg__, %[spmcr]\n\t"
470 "sbrc __tmp_reg__, %[spmenbit]\n\t"
471 "rjmp usbFunctionWrite_waitA\n\t"
472 "ret\n\t"
473
474 "usbFunctionWrite_finished:\n\t"
475 : [addr] "+z" (currentAddress.l)
476
477 : [spmenbit] "I" (SPMEN),
478 [rwwsbbit] "I" (RWWSB),
479 [spmcr] "I" (_SFR_IO_ADDR(__SPM_REG)),
480 [pagfillval] "M" ((1<<SPMEN)),
481 [pageraseval] "M" ((1<<PGERS) | (1<<SPMEN)),
482 [pagwriteval] "M" ((1<<PGWRT) | (1<<SPMEN)),
483 [rwwenrval] "M" ((1<<RWWSRE) | (1<<SPMEN)),
484 [pagemask] "M" (SPM_PAGESIZE-1),
485 #if HAVE_BLB11_SOFTW_LOCKBIT
486 [blsaddrhi] "M" ((uint8_t)((BOOTLOADER_PAGEADDR>>8)&0xff)),
487 // [blsaddrlo] "M" ((uint8_t)((BOOTLOADER_PAGEADDR>>0)&0xff)),
488 #endif
489 [islast] "r" (isLast),
490 [isLastPage] "r" (isLastPage),
491 [len] "d" (len),
492 [dataptr] "x" (data)
493
494 : "r0", "r1", "r18"
495 );
496 }
497 return isLast;
498 }
499 #else
500 uchar usbFunctionWrite(uchar *data, uchar len)
501 {
502 uchar i,isLast;
503
504 DBG1(0x31, (void *)&currentAddress.l, 4);
505 if(len > bytesRemaining)
506 len = bytesRemaining;
507 bytesRemaining -= len;
508 isLast = bytesRemaining == 0;
509 for(i = 0; i < len;) {
510 if(currentRequest >= USBASP_FUNC_READEEPROM){
511 eeprom_write_byte((void *)(currentAddress.w[0]++), *data++);
512 i++;
513 } else {
514 #if HAVE_BLB11_SOFTW_LOCKBIT
515 if (CURRENT_ADDRESS >= (addr_t)(BOOTLOADER_PAGEADDR)) {
516 return 1;
517 }
518 #endif
519 i += 2;
520 DBG1(0x32, 0, 0);
521 cli();
522 boot_page_fill(CURRENT_ADDRESS, *(short *)data);
523 sei();
524 CURRENT_ADDRESS += 2;
525 data += 2;
526 /* write page when we cross page boundary or we have the last partial page */
527 if((currentAddress.w[0] & (SPM_PAGESIZE - 1)) == 0 || (isLast && i >= len && isLastPage)){
528 #if (!HAVE_CHIP_ERASE) || (HAVE_ONDEMAND_PAGEERASE)
529 DBG1(0x33, 0, 0);
530 # ifndef NO_FLASH_WRITE
531 cli();
532 boot_page_erase(CURRENT_ADDRESS - 2); /* erase page */
533 sei();
534 boot_spm_busy_wait(); /* wait until page is erased */
535 # endif
536 #endif
537 DBG1(0x34, 0, 0);
538 #ifndef NO_FLASH_WRITE
539 cli();
540 boot_page_write(CURRENT_ADDRESS - 2);
541 sei();
542 boot_spm_busy_wait();
543 cli();
544 boot_rww_enable();
545 sei();
546 #endif
547 }
548 }
549 DBG1(0x35, (void *)&currentAddress.l, 4);
550 }
551 return isLast;
552 }
553 #endif
554
555 uchar usbFunctionRead(uchar *data, uchar len)
556 {
557 uchar i;
558
559 if(len > bytesRemaining)
560 len = bytesRemaining;
561 bytesRemaining -= len;
562 for(i = 0; i < len; i++){
563 if(currentRequest >= USBASP_FUNC_READEEPROM){
564 *data = eeprom_read_byte((void *)currentAddress.w[0]);
565 }else{
566 #if ((FLASHEND) > 65535)
567 *data = pgm_read_byte_far(CURRENT_ADDRESS);
568 #else
569 *data = pgm_read_byte(CURRENT_ADDRESS);
570 #endif
571 }
572 data++;
573 CURRENT_ADDRESS++;
574 }
575 return len;
576 }
577
578 /* ------------------------------------------------------------------------ */
579
580 static void initForUsbConnectivity(void)
581 {
582 #if HAVE_UNPRECISEWAIT
583 /* (0.25s*F_CPU)/(4 cycles per loop) ~ (65536*waitloopcnt)
584 * F_CPU/(16*65536) ~ waitloopcnt
585 * F_CPU / 1048576 ~ waitloopcnt
586 */
587 uint8_t waitloopcnt = 1 + (F_CPU/1048576);
588 #endif
589 usbInit();
590 /* enforce USB re-enumerate: */
591 usbDeviceDisconnect(); /* do this while interrupts are disabled */
592 #if HAVE_UNPRECISEWAIT
593 asm volatile (
594 /*we really don't care what value Z has...
595 * ...if we loop 65536/F_CPU more or less...
596 * ...unimportant - just save some opcodes
597 */
598 "initForUsbConnectivity_sleeploop: \n\t"
599 "sbiw r30, 1 \n\t"
600 "sbci %0, 0 \n\t"
601 "brne initForUsbConnectivity_sleeploop \n\t"
602 : "+d" (waitloopcnt)
603 :
604 : "r30","r31"
605 );
606 #else
607 _delay_ms(260); /* fake USB disconnect for > 250 ms */
608 #endif
609 usbDeviceConnect();
610 sei();
611 }
612
613 int __attribute__((__noreturn__)) main(void)
614 {
615 /* initialize */
616 bootLoaderInit();
617 odDebugInit();
618 DBG1(0x00, 0, 0);
619 #ifndef NO_FLASH_WRITE
620 GICR = (1 << IVCE); /* enable change of interrupt vectors */
621 GICR = (1 << IVSEL); /* move interrupts to boot flash section */
622 #endif
623 if(bootLoaderCondition()){
624 #if NEED_WATCHDOG
625 wdt_disable(); /* main app may have enabled watchdog */
626 #endif
627 initForUsbConnectivity();
628 do{
629 usbPoll();
630 #if BOOTLOADER_CAN_EXIT
631 #if USE_EXCESSIVE_ASSEMBLER
632 asm volatile (
633 "cpi %[sil], 0x10\n\t"
634 "brlo main_stayinloader_smaller\n\t"
635 "sbic %[pin], %[bit]\n\t"
636 "subi %[sil], 0x10\n\t"
637 "rjmp main_stayinloader_finished\n\t"
638
639 "main_stayinloader_smaller:\n\t"
640 "cpi %[sil], 0x2\n\t"
641 "brlo main_stayinloader_finished\n\t"
642 "sbis %[pin], %[bit]\n\t"
643 "subi %[sil], 0x2\n\t"
644
645 "main_stayinloader_finished:\n\t"
646 : [sil] "+d" (stayinloader)
647 : [pin] "I" (_SFR_IO_ADDR(PIN_PIN(JUMPER_PORT))),
648 [bit] "I" (PIN(JUMPER_PORT, JUMPER_BIT))
649 );
650 #else
651 if (stayinloader >= 0x10) {
652 if (!bootLoaderCondition()) {
653 stayinloader-=0x10;
654 }
655 } else {
656 if (bootLoaderCondition()) {
657 if (stayinloader > 1) stayinloader-=2;
658 }
659 }
660 #endif
661 #endif
662
663 #if BOOTLOADER_CAN_EXIT
664 }while (stayinloader); /* main event loop, if BOOTLOADER_CAN_EXIT*/
665 #else
666 }while (1); /* main event loop */
667 #endif
668 }
669 leaveBootloader();
670 }
671
672 /* ------------------------------------------------------------------------ */
USBasp AVR boot loader