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[pub/lufa.git] / Projects / AVRISP-MKII / Lib / ISP / ISPProtocol.c
1 /*
2 LUFA Library
3 Copyright (C) Dean Camera, 2010.
4
5 dean [at] fourwalledcubicle [dot] com
6 www.fourwalledcubicle.com
7 */
8
9 /*
10 Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
11
12 Permission to use, copy, modify, distribute, and sell this
13 software and its documentation for any purpose is hereby granted
14 without fee, provided that the above copyright notice appear in
15 all copies and that both that the copyright notice and this
16 permission notice and warranty disclaimer appear in supporting
17 documentation, and that the name of the author not be used in
18 advertising or publicity pertaining to distribution of the
19 software without specific, written prior permission.
20
21 The author disclaim all warranties with regard to this
22 software, including all implied warranties of merchantability
23 and fitness. In no event shall the author be liable for any
24 special, indirect or consequential damages or any damages
25 whatsoever resulting from loss of use, data or profits, whether
26 in an action of contract, negligence or other tortious action,
27 arising out of or in connection with the use or performance of
28 this software.
29 */
30
31 /** \file
32 *
33 * ISP Protocol handler, to process V2 Protocol wrapped ISP commands used in Atmel programmer devices.
34 */
35
36 #include "ISPProtocol.h"
37
38 #if defined(ENABLE_ISP_PROTOCOL) || defined(__DOXYGEN__)
39
40 /** Handler for the CMD_ENTER_PROGMODE_ISP command, which attempts to enter programming mode on
41 * the attached device, returning success or failure back to the host.
42 */
43 void ISPProtocol_EnterISPMode(void)
44 {
45 struct
46 {
47 uint8_t TimeoutMS;
48 uint8_t PinStabDelayMS;
49 uint8_t ExecutionDelayMS;
50 uint8_t SynchLoops;
51 uint8_t ByteDelay;
52 uint8_t PollValue;
53 uint8_t PollIndex;
54 uint8_t EnterProgBytes[4];
55 } Enter_ISP_Params;
56
57 Endpoint_Read_Stream_LE(&Enter_ISP_Params, sizeof(Enter_ISP_Params), NO_STREAM_CALLBACK);
58
59 Endpoint_ClearOUT();
60 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
61 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
62
63 uint8_t ResponseStatus = STATUS_CMD_FAILED;
64
65 CurrentAddress = 0;
66
67 /* Set up the synchronous USART to generate the .5MHz recovery clock on XCK pin */
68 UBRR1 = (F_CPU / 500000UL);
69 UCSR1B = (1 << TXEN1);
70 UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
71 DDRD |= (1 << 5);
72
73 /* Perform execution delay, initialize SPI bus */
74 ISPProtocol_DelayMS(Enter_ISP_Params.ExecutionDelayMS);
75 ISPTarget_Init();
76
77 /* Continuously attempt to synchronize with the target until either the number of attempts specified
78 * by the host has exceeded, or the the device sends back the expected response values */
79 while (Enter_ISP_Params.SynchLoops-- && (ResponseStatus == STATUS_CMD_FAILED) && TimeoutTicksRemaining)
80 {
81 uint8_t ResponseBytes[4];
82
83 ISPTarget_ChangeTargetResetLine(true);
84 ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
85
86 for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
87 {
88 ISPProtocol_DelayMS(Enter_ISP_Params.ByteDelay);
89 ResponseBytes[RByte] = ISPTarget_TransferByte(Enter_ISP_Params.EnterProgBytes[RByte]);
90 }
91
92 /* Check if polling disabled, or if the polled value matches the expected value */
93 if (!(Enter_ISP_Params.PollIndex) || (ResponseBytes[Enter_ISP_Params.PollIndex - 1] == Enter_ISP_Params.PollValue))
94 {
95 ResponseStatus = STATUS_CMD_OK;
96 }
97 else
98 {
99 ISPTarget_ChangeTargetResetLine(false);
100 ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
101 }
102 }
103
104 Endpoint_Write_Byte(CMD_ENTER_PROGMODE_ISP);
105 Endpoint_Write_Byte(ResponseStatus);
106 Endpoint_ClearIN();
107 }
108
109 /** Handler for the CMD_LEAVE_ISP command, which releases the target from programming mode. */
110 void ISPProtocol_LeaveISPMode(void)
111 {
112 struct
113 {
114 uint8_t PreDelayMS;
115 uint8_t PostDelayMS;
116 } Leave_ISP_Params;
117
118 Endpoint_Read_Stream_LE(&Leave_ISP_Params, sizeof(Leave_ISP_Params), NO_STREAM_CALLBACK);
119
120 Endpoint_ClearOUT();
121 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
122 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
123
124 /* Perform pre-exit delay, release the target /RESET, disable the SPI bus and perform the post-exit delay */
125 ISPProtocol_DelayMS(Leave_ISP_Params.PreDelayMS);
126 ISPTarget_ChangeTargetResetLine(false);
127 ISPTarget_ShutDown();
128 ISPProtocol_DelayMS(Leave_ISP_Params.PostDelayMS);
129
130 /* Turn off the synchronous USART to terminate the recovery clock on XCK pin */
131 UBRR1 = (F_CPU / 500000UL);
132 UCSR1B = (1 << TXEN1);
133 UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
134 DDRD &= ~(1 << 5);
135
136 Endpoint_Write_Byte(CMD_LEAVE_PROGMODE_ISP);
137 Endpoint_Write_Byte(STATUS_CMD_OK);
138 Endpoint_ClearIN();
139 }
140
141 /** Handler for the CMD_PROGRAM_FLASH_ISP and CMD_PROGRAM_EEPROM_ISP commands, writing out bytes,
142 * words or pages of data to the attached device.
143 *
144 * \param[in] V2Command Issued V2 Protocol command byte from the host
145 */
146 void ISPProtocol_ProgramMemory(uint8_t V2Command)
147 {
148 struct
149 {
150 uint16_t BytesToWrite;
151 uint8_t ProgrammingMode;
152 uint8_t DelayMS;
153 uint8_t ProgrammingCommands[3];
154 uint8_t PollValue1;
155 uint8_t PollValue2;
156 uint8_t ProgData[256]; // Note, the Jungo driver has a very short ACK timeout period, need to buffer the
157 } Write_Memory_Params; // whole page and ACK the packet as fast as possible to prevent it from aborting
158
159 Endpoint_Read_Stream_LE(&Write_Memory_Params, (sizeof(Write_Memory_Params) -
160 sizeof(Write_Memory_Params.ProgData)), NO_STREAM_CALLBACK);
161
162
163 Write_Memory_Params.BytesToWrite = SwapEndian_16(Write_Memory_Params.BytesToWrite);
164
165 if (Write_Memory_Params.BytesToWrite > sizeof(Write_Memory_Params.ProgData))
166 {
167 Endpoint_ClearOUT();
168 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
169 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
170
171 Endpoint_Write_Byte(V2Command);
172 Endpoint_Write_Byte(STATUS_CMD_FAILED);
173 Endpoint_ClearIN();
174 return;
175 }
176
177 Endpoint_Read_Stream_LE(&Write_Memory_Params.ProgData, Write_Memory_Params.BytesToWrite, NO_STREAM_CALLBACK);
178
179 Endpoint_ClearOUT();
180 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
181 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
182
183 uint8_t ProgrammingStatus = STATUS_CMD_OK;
184 uint16_t PollAddress = 0;
185 uint8_t PollValue = (V2Command == CMD_PROGRAM_FLASH_ISP) ? Write_Memory_Params.PollValue1 :
186 Write_Memory_Params.PollValue2;
187 uint8_t* NextWriteByte = Write_Memory_Params.ProgData;
188
189 /* Check the programming mode desired by the host, either Paged or Word memory writes */
190 if (Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_WRITES_MASK)
191 {
192 uint16_t StartAddress = (CurrentAddress & 0xFFFF);
193
194 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
195 if (MustLoadExtendedAddress)
196 {
197 ISPTarget_LoadExtendedAddress();
198 MustLoadExtendedAddress = false;
199 }
200
201 /* Paged mode memory programming */
202 for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
203 {
204 bool IsOddByte = (CurrentByte & 0x01);
205 uint8_t ByteToWrite = *(NextWriteByte++);
206
207 ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
208 ISPTarget_SendByte(CurrentAddress >> 8);
209 ISPTarget_SendByte(CurrentAddress & 0xFF);
210 ISPTarget_SendByte(ByteToWrite);
211
212 /* AVR FLASH addressing requires us to modify the write command based on if we are writing a high
213 * or low byte at the current word address */
214 if (V2Command == CMD_PROGRAM_FLASH_ISP)
215 Write_Memory_Params.ProgrammingCommands[0] ^= READ_WRITE_HIGH_BYTE_MASK;
216
217 /* Check to see the write completion method, to see if we have a valid polling address */
218 if (!(PollAddress) && (ByteToWrite != PollValue))
219 {
220 if (IsOddByte && (V2Command == CMD_PROGRAM_FLASH_ISP))
221 Write_Memory_Params.ProgrammingCommands[2] |= READ_WRITE_HIGH_BYTE_MASK;
222
223 PollAddress = (CurrentAddress & 0xFFFF);
224 }
225
226 /* EEPROM increments the address on each byte, flash needs to increment on each word */
227 if (IsOddByte || (V2Command == CMD_PROGRAM_EEPROM_ISP))
228 CurrentAddress++;
229 }
230
231 /* If the current page must be committed, send the PROGRAM PAGE command to the target */
232 if (Write_Memory_Params.ProgrammingMode & PROG_MODE_COMMIT_PAGE_MASK)
233 {
234 ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[1]);
235 ISPTarget_SendByte(StartAddress >> 8);
236 ISPTarget_SendByte(StartAddress & 0xFF);
237 ISPTarget_SendByte(0x00);
238
239 /* Check if polling is possible and enabled, if not switch to timed delay mode */
240 if (!(PollAddress) && (Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_VALUE_MASK))
241 {
242 Write_Memory_Params.ProgrammingMode &= ~PROG_MODE_PAGED_VALUE_MASK;
243 Write_Memory_Params.ProgrammingMode |= PROG_MODE_PAGED_TIMEDELAY_MASK;
244 }
245
246 ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
247 Write_Memory_Params.DelayMS, Write_Memory_Params.ProgrammingCommands[2]);
248
249 /* Check to see if the FLASH address has crossed the extended address boundary */
250 if ((V2Command == CMD_PROGRAM_FLASH_ISP) && !(CurrentAddress & 0xFFFF))
251 MustLoadExtendedAddress = true;
252 }
253 }
254 else
255 {
256 /* Word/byte mode memory programming */
257 for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
258 {
259 bool IsOddByte = (CurrentByte & 0x01);
260 uint8_t ByteToWrite = *(NextWriteByte++);
261
262 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
263 if (MustLoadExtendedAddress)
264 {
265 ISPTarget_LoadExtendedAddress();
266 MustLoadExtendedAddress = false;
267 }
268
269 ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
270 ISPTarget_SendByte(CurrentAddress >> 8);
271 ISPTarget_SendByte(CurrentAddress & 0xFF);
272 ISPTarget_SendByte(ByteToWrite);
273
274 /* AVR FLASH addressing requires us to modify the write command based on if we are writing a high
275 * or low byte at the current word address */
276 if (V2Command == CMD_PROGRAM_FLASH_ISP)
277 Write_Memory_Params.ProgrammingCommands[0] ^= READ_WRITE_HIGH_BYTE_MASK;
278
279 /* Save previous programming mode in case we modify it for the current word */
280 uint8_t PreviousProgrammingMode = Write_Memory_Params.ProgrammingMode;
281
282 if (ByteToWrite != PollValue)
283 {
284 if (IsOddByte && (V2Command == CMD_PROGRAM_FLASH_ISP))
285 Write_Memory_Params.ProgrammingCommands[2] |= READ_WRITE_HIGH_BYTE_MASK;
286
287 PollAddress = (CurrentAddress & 0xFFFF);
288 }
289 else if (!(Write_Memory_Params.ProgrammingMode & PROG_MODE_WORD_READYBUSY_MASK))
290 {
291 Write_Memory_Params.ProgrammingMode &= ~PROG_MODE_WORD_VALUE_MASK;
292 Write_Memory_Params.ProgrammingMode |= PROG_MODE_WORD_TIMEDELAY_MASK;
293 }
294
295 ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
296 Write_Memory_Params.DelayMS, Write_Memory_Params.ProgrammingCommands[2]);
297
298 /* Restore previous programming mode mask in case the current word needed to change it */
299 Write_Memory_Params.ProgrammingMode = PreviousProgrammingMode;
300
301 /* Abort the programming loop early if the byte/word programming failed */
302 if (ProgrammingStatus != STATUS_CMD_OK)
303 break;
304
305 /* EEPROM just increments the address each byte, flash needs to increment on each word and
306 * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
307 * address boundary has been crossed */
308 if ((CurrentByte & 0x01) || (V2Command == CMD_PROGRAM_EEPROM_ISP))
309 {
310 CurrentAddress++;
311
312 if ((V2Command != CMD_PROGRAM_EEPROM_ISP) && !(CurrentAddress & 0xFFFF))
313 MustLoadExtendedAddress = true;
314 }
315 }
316 }
317
318 Endpoint_Write_Byte(V2Command);
319 Endpoint_Write_Byte(ProgrammingStatus);
320 Endpoint_ClearIN();
321 }
322
323 /** Handler for the CMD_READ_FLASH_ISP and CMD_READ_EEPROM_ISP commands, reading in bytes,
324 * words or pages of data from the attached device.
325 *
326 * \param[in] V2Command Issued V2 Protocol command byte from the host
327 */
328 void ISPProtocol_ReadMemory(uint8_t V2Command)
329 {
330 struct
331 {
332 uint16_t BytesToRead;
333 uint8_t ReadMemoryCommand;
334 } Read_Memory_Params;
335
336 Endpoint_Read_Stream_LE(&Read_Memory_Params, sizeof(Read_Memory_Params), NO_STREAM_CALLBACK);
337 Read_Memory_Params.BytesToRead = SwapEndian_16(Read_Memory_Params.BytesToRead);
338
339 Endpoint_ClearOUT();
340 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
341 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
342
343 Endpoint_Write_Byte(V2Command);
344 Endpoint_Write_Byte(STATUS_CMD_OK);
345
346 /* Read each byte from the device and write them to the packet for the host */
347 for (uint16_t CurrentByte = 0; CurrentByte < Read_Memory_Params.BytesToRead; CurrentByte++)
348 {
349 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
350 if (MustLoadExtendedAddress)
351 {
352 ISPTarget_LoadExtendedAddress();
353 MustLoadExtendedAddress = false;
354 }
355
356 /* Read the next byte from the desired memory space in the device */
357 ISPTarget_SendByte(Read_Memory_Params.ReadMemoryCommand);
358 ISPTarget_SendByte(CurrentAddress >> 8);
359 ISPTarget_SendByte(CurrentAddress & 0xFF);
360 Endpoint_Write_Byte(ISPTarget_ReceiveByte());
361
362 /* Check if the endpoint bank is currently full, if so send the packet */
363 if (!(Endpoint_IsReadWriteAllowed()))
364 {
365 Endpoint_ClearIN();
366 Endpoint_WaitUntilReady();
367 }
368
369 /* AVR FLASH addressing requires us to modify the read command based on if we are reading a high
370 * or low byte at the current word address */
371 if (V2Command == CMD_READ_FLASH_ISP)
372 Read_Memory_Params.ReadMemoryCommand ^= READ_WRITE_HIGH_BYTE_MASK;
373
374 /* EEPROM just increments the address each byte, flash needs to increment on each word and
375 * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
376 * address boundary has been crossed */
377 if ((CurrentByte & 0x01) || (V2Command == CMD_READ_EEPROM_ISP))
378 {
379 CurrentAddress++;
380
381 if ((V2Command != CMD_READ_EEPROM_ISP) && !(CurrentAddress & 0xFFFF))
382 MustLoadExtendedAddress = true;
383 }
384 }
385
386 Endpoint_Write_Byte(STATUS_CMD_OK);
387
388 bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
389 Endpoint_ClearIN();
390
391 /* Ensure last packet is a short packet to terminate the transfer */
392 if (IsEndpointFull)
393 {
394 Endpoint_WaitUntilReady();
395 Endpoint_ClearIN();
396 Endpoint_WaitUntilReady();
397 }
398 }
399
400 /** Handler for the CMD_CHI_ERASE_ISP command, clearing the target's FLASH memory. */
401 void ISPProtocol_ChipErase(void)
402 {
403 struct
404 {
405 uint8_t EraseDelayMS;
406 uint8_t PollMethod;
407 uint8_t EraseCommandBytes[4];
408 } Erase_Chip_Params;
409
410 Endpoint_Read_Stream_LE(&Erase_Chip_Params, sizeof(Erase_Chip_Params), NO_STREAM_CALLBACK);
411
412 Endpoint_ClearOUT();
413 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
414 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
415
416 uint8_t ResponseStatus = STATUS_CMD_OK;
417
418 /* Send the chip erase commands as given by the host to the device */
419 for (uint8_t SByte = 0; SByte < sizeof(Erase_Chip_Params.EraseCommandBytes); SByte++)
420 ISPTarget_SendByte(Erase_Chip_Params.EraseCommandBytes[SByte]);
421
422 /* Use appropriate command completion check as given by the host (delay or busy polling) */
423 if (!(Erase_Chip_Params.PollMethod))
424 ISPProtocol_DelayMS(Erase_Chip_Params.EraseDelayMS);
425 else
426 ResponseStatus = ISPTarget_WaitWhileTargetBusy();
427
428 Endpoint_Write_Byte(CMD_CHIP_ERASE_ISP);
429 Endpoint_Write_Byte(ResponseStatus);
430 Endpoint_ClearIN();
431 }
432
433 /** Handler for the CMD_READ_FUSE_ISP, CMD_READ_LOCK_ISP, CMD_READ_SIGNATURE_ISP and CMD_READ_OSCCAL commands,
434 * reading the requested configuration byte from the device.
435 *
436 * \param[in] V2Command Issued V2 Protocol command byte from the host
437 */
438 void ISPProtocol_ReadFuseLockSigOSCCAL(uint8_t V2Command)
439 {
440 struct
441 {
442 uint8_t RetByte;
443 uint8_t ReadCommandBytes[4];
444 } Read_FuseLockSigOSCCAL_Params;
445
446 Endpoint_Read_Stream_LE(&Read_FuseLockSigOSCCAL_Params, sizeof(Read_FuseLockSigOSCCAL_Params), NO_STREAM_CALLBACK);
447
448 Endpoint_ClearOUT();
449 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
450 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
451
452 uint8_t ResponseBytes[4];
453
454 /* Send the Fuse or Lock byte read commands as given by the host to the device, store response */
455 for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
456 ResponseBytes[RByte] = ISPTarget_TransferByte(Read_FuseLockSigOSCCAL_Params.ReadCommandBytes[RByte]);
457
458 Endpoint_Write_Byte(V2Command);
459 Endpoint_Write_Byte(STATUS_CMD_OK);
460 Endpoint_Write_Byte(ResponseBytes[Read_FuseLockSigOSCCAL_Params.RetByte - 1]);
461 Endpoint_Write_Byte(STATUS_CMD_OK);
462 Endpoint_ClearIN();
463 }
464
465 /** Handler for the CMD_WRITE_FUSE_ISP and CMD_WRITE_LOCK_ISP commands, writing the requested configuration
466 * byte to the device.
467 *
468 * \param[in] V2Command Issued V2 Protocol command byte from the host
469 */
470 void ISPProtocol_WriteFuseLock(uint8_t V2Command)
471 {
472 struct
473 {
474 uint8_t WriteCommandBytes[4];
475 } Write_FuseLockSig_Params;
476
477 Endpoint_Read_Stream_LE(&Write_FuseLockSig_Params, sizeof(Write_FuseLockSig_Params), NO_STREAM_CALLBACK);
478
479 Endpoint_ClearOUT();
480 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
481 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
482
483 /* Send the Fuse or Lock byte program commands as given by the host to the device */
484 for (uint8_t SByte = 0; SByte < sizeof(Write_FuseLockSig_Params.WriteCommandBytes); SByte++)
485 ISPTarget_SendByte(Write_FuseLockSig_Params.WriteCommandBytes[SByte]);
486
487 Endpoint_Write_Byte(V2Command);
488 Endpoint_Write_Byte(STATUS_CMD_OK);
489 Endpoint_Write_Byte(STATUS_CMD_OK);
490 Endpoint_ClearIN();
491 }
492
493 /** Handler for the CMD_SPI_MULTI command, writing and reading arbitrary SPI data to and from the attached device. */
494 void ISPProtocol_SPIMulti(void)
495 {
496 struct
497 {
498 uint8_t TxBytes;
499 uint8_t RxBytes;
500 uint8_t RxStartAddr;
501 uint8_t TxData[255];
502 } SPI_Multi_Params;
503
504 Endpoint_Read_Stream_LE(&SPI_Multi_Params, (sizeof(SPI_Multi_Params) - sizeof(SPI_Multi_Params.TxData)), NO_STREAM_CALLBACK);
505 Endpoint_Read_Stream_LE(&SPI_Multi_Params.TxData, SPI_Multi_Params.TxBytes, NO_STREAM_CALLBACK);
506
507 Endpoint_ClearOUT();
508 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
509 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
510
511 Endpoint_Write_Byte(CMD_SPI_MULTI);
512 Endpoint_Write_Byte(STATUS_CMD_OK);
513
514 uint8_t CurrTxPos = 0;
515 uint8_t CurrRxPos = 0;
516
517 /* Write out bytes to transmit until the start of the bytes to receive is met */
518 while (CurrTxPos < SPI_Multi_Params.RxStartAddr)
519 {
520 if (CurrTxPos < SPI_Multi_Params.TxBytes)
521 ISPTarget_SendByte(SPI_Multi_Params.TxData[CurrTxPos]);
522 else
523 ISPTarget_SendByte(0);
524
525 CurrTxPos++;
526 }
527
528 /* Transmit remaining bytes with padding as needed, read in response bytes */
529 while (CurrRxPos < SPI_Multi_Params.RxBytes)
530 {
531 if (CurrTxPos < SPI_Multi_Params.TxBytes)
532 Endpoint_Write_Byte(ISPTarget_TransferByte(SPI_Multi_Params.TxData[CurrTxPos++]));
533 else
534 Endpoint_Write_Byte(ISPTarget_ReceiveByte());
535
536 /* Check to see if we have filled the endpoint bank and need to send the packet */
537 if (!(Endpoint_IsReadWriteAllowed()))
538 {
539 Endpoint_ClearIN();
540 Endpoint_WaitUntilReady();
541 }
542
543 CurrRxPos++;
544 }
545
546 Endpoint_Write_Byte(STATUS_CMD_OK);
547
548 bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
549 Endpoint_ClearIN();
550
551 /* Ensure last packet is a short packet to terminate the transfer */
552 if (IsEndpointFull)
553 {
554 Endpoint_WaitUntilReady();
555 Endpoint_ClearIN();
556 Endpoint_WaitUntilReady();
557 }
558 }
559
560 /** Blocking delay for a given number of milliseconds.
561 *
562 * \param[in] DelayMS Number of milliseconds to delay for
563 */
564 void ISPProtocol_DelayMS(uint8_t DelayMS)
565 {
566 while (DelayMS-- && TimeoutTicksRemaining)
567 _delay_ms(1);
568 }
569
570 #endif
Lightweight USB Framework for AVRs