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