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.lufa-lib.org
   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         /* Perform execution delay, initialize SPI bus */
  68         ISPProtocol_DelayMS(Enter_ISP_Params.ExecutionDelayMS);
  69         ISPTarget_EnableTargetISP();
  70
  71         /* Continuously attempt to synchronize with the target until either the number of attempts specified
  72          * by the host has exceeded, or the the device sends back the expected response values */
  73         while (Enter_ISP_Params.SynchLoops-- && (ResponseStatus == STATUS_CMD_FAILED) && TimeoutTicksRemaining)
  74         {
  75                 uint8_t ResponseBytes[4];
  76
  77                 ISPTarget_ChangeTargetResetLine(true);
  78                 ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
  79
  80                 for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
  81                 {
  82                         ISPProtocol_DelayMS(Enter_ISP_Params.ByteDelay);
  83                         ResponseBytes[RByte] = ISPTarget_TransferByte(Enter_ISP_Params.EnterProgBytes[RByte]);
  84                 }
  85
  86                 /* Check if polling disabled, or if the polled value matches the expected value */
  87                 if (!(Enter_ISP_Params.PollIndex) || (ResponseBytes[Enter_ISP_Params.PollIndex - 1] == Enter_ISP_Params.PollValue))
  88                 {
  89                         ResponseStatus = STATUS_CMD_OK;
  90                 }
  91                 else
  92                 {
  93                         ISPTarget_ChangeTargetResetLine(false);
  94                         ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
  95                 }
  96         }
  97
  98         Endpoint_Write_Byte(CMD_ENTER_PROGMODE_ISP);
  99         Endpoint_Write_Byte(ResponseStatus);
 100         Endpoint_ClearIN();
 101 }
 102
 103 /** Handler for the CMD_LEAVE_ISP command, which releases the target from programming mode. */
 104 void ISPProtocol_LeaveISPMode(void)
 105 {
 106         struct
 107         {
 108                 uint8_t PreDelayMS;
 109                 uint8_t PostDelayMS;
 110         } Leave_ISP_Params;
 111
 112         Endpoint_Read_Stream_LE(&Leave_ISP_Params, sizeof(Leave_ISP_Params), NO_STREAM_CALLBACK);
 113
 114         Endpoint_ClearOUT();
 115         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 116         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 117
 118         /* Perform pre-exit delay, release the target /RESET, disable the SPI bus and perform the post-exit delay */
 119         ISPProtocol_DelayMS(Leave_ISP_Params.PreDelayMS);
 120         ISPTarget_ChangeTargetResetLine(false);
 121         ISPTarget_DisableTargetISP();
 122         ISPProtocol_DelayMS(Leave_ISP_Params.PostDelayMS);
 123
 124         Endpoint_Write_Byte(CMD_LEAVE_PROGMODE_ISP);
 125         Endpoint_Write_Byte(STATUS_CMD_OK);
 126         Endpoint_ClearIN();
 127 }
 128
 129 /** Handler for the CMD_PROGRAM_FLASH_ISP and CMD_PROGRAM_EEPROM_ISP commands, writing out bytes,
 130  *  words or pages of data to the attached device.
 131  *
 132  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 133  */
 134 void ISPProtocol_ProgramMemory(uint8_t V2Command)
 135 {
 136         struct
 137         {
 138                 uint16_t BytesToWrite;
 139                 uint8_t  ProgrammingMode;
 140                 uint8_t  DelayMS;
 141                 uint8_t  ProgrammingCommands[3];
 142                 uint8_t  PollValue1;
 143                 uint8_t  PollValue2;
 144                 uint8_t  ProgData[256]; // Note, the Jungo driver has a very short ACK timeout period, need to buffer the
 145         } Write_Memory_Params;      // whole page and ACK the packet as fast as possible to prevent it from aborting
 146
 147         Endpoint_Read_Stream_LE(&Write_Memory_Params, (sizeof(Write_Memory_Params) -
 148                                                        sizeof(Write_Memory_Params.ProgData)), NO_STREAM_CALLBACK);
 149
 150
 151         Write_Memory_Params.BytesToWrite = SwapEndian_16(Write_Memory_Params.BytesToWrite);
 152
 153         if (Write_Memory_Params.BytesToWrite > sizeof(Write_Memory_Params.ProgData))
 154         {
 155                 Endpoint_ClearOUT();
 156                 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 157                 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 158
 159                 Endpoint_Write_Byte(V2Command);
 160                 Endpoint_Write_Byte(STATUS_CMD_FAILED);
 161                 Endpoint_ClearIN();
 162                 return;
 163         }
 164
 165         Endpoint_Read_Stream_LE(&Write_Memory_Params.ProgData, Write_Memory_Params.BytesToWrite, NO_STREAM_CALLBACK);
 166
 167         Endpoint_ClearOUT();
 168         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 169         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 170
 171         uint8_t  ProgrammingStatus = STATUS_CMD_OK;
 172         uint16_t PollAddress       = 0;
 173         uint8_t  PollValue         = (V2Command == CMD_PROGRAM_FLASH_ISP) ? Write_Memory_Params.PollValue1 :
 174                                                                             Write_Memory_Params.PollValue2;
 175         uint8_t* NextWriteByte     = Write_Memory_Params.ProgData;
 176
 177         /* Check the programming mode desired by the host, either Paged or Word memory writes */
 178         if (Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_WRITES_MASK)
 179         {
 180                 uint16_t StartAddress = (CurrentAddress & 0xFFFF);
 181
 182                 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
 183                 if (MustLoadExtendedAddress)
 184                 {
 185                         ISPTarget_LoadExtendedAddress();
 186                         MustLoadExtendedAddress = false;
 187                 }
 188
 189                 /* Paged mode memory programming */
 190                 for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
 191                 {
 192                         bool    IsOddByte   = (CurrentByte & 0x01);
 193                         uint8_t ByteToWrite = *(NextWriteByte++);
 194
 195                         ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
 196                         ISPTarget_SendByte(CurrentAddress >> 8);
 197                         ISPTarget_SendByte(CurrentAddress & 0xFF);
 198                         ISPTarget_SendByte(ByteToWrite);
 199
 200                         /* AVR FLASH addressing requires us to modify the write command based on if we are writing a high
 201                          * or low byte at the current word address */
 202                         if (V2Command == CMD_PROGRAM_FLASH_ISP)
 203                           Write_Memory_Params.ProgrammingCommands[0] ^= READ_WRITE_HIGH_BYTE_MASK;
 204
 205                         /* Check to see the write completion method, to see if we have a valid polling address */
 206                         if (!(PollAddress) && (ByteToWrite != PollValue))
 207                         {
 208                                 if (IsOddByte && (V2Command == CMD_PROGRAM_FLASH_ISP))
 209                                   Write_Memory_Params.ProgrammingCommands[2] |= READ_WRITE_HIGH_BYTE_MASK;
 210
 211                                 PollAddress = (CurrentAddress & 0xFFFF);
 212                         }
 213
 214                         /* EEPROM increments the address on each byte, flash needs to increment on each word */
 215                         if (IsOddByte || (V2Command == CMD_PROGRAM_EEPROM_ISP))
 216                           CurrentAddress++;
 217                 }
 218
 219                 /* If the current page must be committed, send the PROGRAM PAGE command to the target */
 220                 if (Write_Memory_Params.ProgrammingMode & PROG_MODE_COMMIT_PAGE_MASK)
 221                 {
 222                         ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[1]);
 223                         ISPTarget_SendByte(StartAddress >> 8);
 224                         ISPTarget_SendByte(StartAddress & 0xFF);
 225                         ISPTarget_SendByte(0x00);
 226
 227                         /* Check if polling is possible and enabled, if not switch to timed delay mode */
 228                         if (!(PollAddress) && (Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_VALUE_MASK))
 229                         {
 230                                 Write_Memory_Params.ProgrammingMode &= ~PROG_MODE_PAGED_VALUE_MASK;
 231                                 Write_Memory_Params.ProgrammingMode |=  PROG_MODE_PAGED_TIMEDELAY_MASK;
 232                         }
 233
 234                         ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
 235                                                                           Write_Memory_Params.DelayMS, Write_Memory_Params.ProgrammingCommands[2]);
 236
 237                         /* Check to see if the FLASH address has crossed the extended address boundary */
 238                         if ((V2Command == CMD_PROGRAM_FLASH_ISP) && !(CurrentAddress & 0xFFFF))
 239                           MustLoadExtendedAddress = true;
 240                 }
 241         }
 242         else
 243         {
 244                 /* Word/byte mode memory programming */
 245                 for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
 246                 {
 247                         bool    IsOddByte   = (CurrentByte & 0x01);
 248                         uint8_t ByteToWrite = *(NextWriteByte++);
 249
 250                         /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
 251                         if (MustLoadExtendedAddress)
 252                         {
 253                                 ISPTarget_LoadExtendedAddress();
 254                                 MustLoadExtendedAddress = false;
 255                         }
 256
 257                         ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
 258                         ISPTarget_SendByte(CurrentAddress >> 8);
 259                         ISPTarget_SendByte(CurrentAddress & 0xFF);
 260                         ISPTarget_SendByte(ByteToWrite);
 261
 262                         /* AVR FLASH addressing requires us to modify the write command based on if we are writing a high
 263                          * or low byte at the current word address */
 264                         if (V2Command == CMD_PROGRAM_FLASH_ISP)
 265                           Write_Memory_Params.ProgrammingCommands[0] ^= READ_WRITE_HIGH_BYTE_MASK;
 266
 267                         /* Save previous programming mode in case we modify it for the current word */
 268                         uint8_t PreviousProgrammingMode = Write_Memory_Params.ProgrammingMode;
 269
 270                         if (ByteToWrite != PollValue)
 271                         {
 272                                 if (IsOddByte && (V2Command == CMD_PROGRAM_FLASH_ISP))
 273                                   Write_Memory_Params.ProgrammingCommands[2] |= READ_WRITE_HIGH_BYTE_MASK;
 274
 275                                 PollAddress = (CurrentAddress & 0xFFFF);
 276                         }
 277                         else if (!(Write_Memory_Params.ProgrammingMode & PROG_MODE_WORD_READYBUSY_MASK))
 278                         {
 279                                 Write_Memory_Params.ProgrammingMode &= ~PROG_MODE_WORD_VALUE_MASK;
 280                                 Write_Memory_Params.ProgrammingMode |=  PROG_MODE_WORD_TIMEDELAY_MASK;
 281                         }
 282
 283                         ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
 284                                                                           Write_Memory_Params.DelayMS, Write_Memory_Params.ProgrammingCommands[2]);
 285
 286                         /* Restore previous programming mode mask in case the current word needed to change it */
 287                         Write_Memory_Params.ProgrammingMode = PreviousProgrammingMode;
 288
 289                         /* Abort the programming loop early if the byte/word programming failed */
 290                         if (ProgrammingStatus != STATUS_CMD_OK)
 291                           break;
 292
 293                         /* EEPROM just increments the address each byte, flash needs to increment on each word and
 294                          * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
 295                          * address boundary has been crossed */
 296                         if ((CurrentByte & 0x01) || (V2Command == CMD_PROGRAM_EEPROM_ISP))
 297                         {
 298                                 CurrentAddress++;
 299
 300                                 if ((V2Command != CMD_PROGRAM_EEPROM_ISP) && !(CurrentAddress & 0xFFFF))
 301                                   MustLoadExtendedAddress = true;
 302                         }
 303                 }
 304         }
 305
 306         Endpoint_Write_Byte(V2Command);
 307         Endpoint_Write_Byte(ProgrammingStatus);
 308         Endpoint_ClearIN();
 309 }
 310
 311 /** Handler for the CMD_READ_FLASH_ISP and CMD_READ_EEPROM_ISP commands, reading in bytes,
 312  *  words or pages of data from the attached device.
 313  *
 314  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 315  */
 316 void ISPProtocol_ReadMemory(uint8_t V2Command)
 317 {
 318         struct
 319         {
 320                 uint16_t BytesToRead;
 321                 uint8_t  ReadMemoryCommand;
 322         } Read_Memory_Params;
 323
 324         Endpoint_Read_Stream_LE(&Read_Memory_Params, sizeof(Read_Memory_Params), NO_STREAM_CALLBACK);
 325         Read_Memory_Params.BytesToRead = SwapEndian_16(Read_Memory_Params.BytesToRead);
 326
 327         Endpoint_ClearOUT();
 328         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 329         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 330
 331         Endpoint_Write_Byte(V2Command);
 332         Endpoint_Write_Byte(STATUS_CMD_OK);
 333
 334         /* Read each byte from the device and write them to the packet for the host */
 335         for (uint16_t CurrentByte = 0; CurrentByte < Read_Memory_Params.BytesToRead; CurrentByte++)
 336         {
 337                 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
 338                 if (MustLoadExtendedAddress)
 339                 {
 340                         ISPTarget_LoadExtendedAddress();
 341                         MustLoadExtendedAddress = false;
 342                 }
 343
 344                 /* Read the next byte from the desired memory space in the device */
 345                 ISPTarget_SendByte(Read_Memory_Params.ReadMemoryCommand);
 346                 ISPTarget_SendByte(CurrentAddress >> 8);
 347                 ISPTarget_SendByte(CurrentAddress & 0xFF);
 348                 Endpoint_Write_Byte(ISPTarget_ReceiveByte());
 349
 350                 /* Check if the endpoint bank is currently full, if so send the packet */
 351                 if (!(Endpoint_IsReadWriteAllowed()))
 352                 {
 353                         Endpoint_ClearIN();
 354                         Endpoint_WaitUntilReady();
 355                 }
 356
 357                 /* AVR FLASH addressing requires us to modify the read command based on if we are reading a high
 358                  * or low byte at the current word address */
 359                 if (V2Command == CMD_READ_FLASH_ISP)
 360                   Read_Memory_Params.ReadMemoryCommand ^= READ_WRITE_HIGH_BYTE_MASK;
 361
 362                 /* EEPROM just increments the address each byte, flash needs to increment on each word and
 363                  * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
 364                  * address boundary has been crossed */
 365                 if ((CurrentByte & 0x01) || (V2Command == CMD_READ_EEPROM_ISP))
 366                 {
 367                         CurrentAddress++;
 368
 369                         if ((V2Command != CMD_READ_EEPROM_ISP) && !(CurrentAddress & 0xFFFF))
 370                           MustLoadExtendedAddress = true;
 371                 }
 372         }
 373
 374         Endpoint_Write_Byte(STATUS_CMD_OK);
 375
 376         bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 377         Endpoint_ClearIN();
 378
 379         /* Ensure last packet is a short packet to terminate the transfer */
 380         if (IsEndpointFull)
 381         {
 382                 Endpoint_WaitUntilReady();
 383                 Endpoint_ClearIN();
 384                 Endpoint_WaitUntilReady();
 385         }
 386 }
 387
 388 /** Handler for the CMD_CHI_ERASE_ISP command, clearing the target's FLASH memory. */
 389 void ISPProtocol_ChipErase(void)
 390 {
 391         struct
 392         {
 393                 uint8_t EraseDelayMS;
 394                 uint8_t PollMethod;
 395                 uint8_t EraseCommandBytes[4];
 396         } Erase_Chip_Params;
 397
 398         Endpoint_Read_Stream_LE(&Erase_Chip_Params, sizeof(Erase_Chip_Params), NO_STREAM_CALLBACK);
 399
 400         Endpoint_ClearOUT();
 401         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 402         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 403
 404         uint8_t ResponseStatus = STATUS_CMD_OK;
 405
 406         /* Send the chip erase commands as given by the host to the device */
 407         for (uint8_t SByte = 0; SByte < sizeof(Erase_Chip_Params.EraseCommandBytes); SByte++)
 408           ISPTarget_SendByte(Erase_Chip_Params.EraseCommandBytes[SByte]);
 409
 410         /* Use appropriate command completion check as given by the host (delay or busy polling) */
 411         if (!(Erase_Chip_Params.PollMethod))
 412           ISPProtocol_DelayMS(Erase_Chip_Params.EraseDelayMS);
 413         else
 414           ResponseStatus = ISPTarget_WaitWhileTargetBusy();
 415
 416         Endpoint_Write_Byte(CMD_CHIP_ERASE_ISP);
 417         Endpoint_Write_Byte(ResponseStatus);
 418         Endpoint_ClearIN();
 419 }
 420
 421 /** Handler for the CMD_READ_FUSE_ISP, CMD_READ_LOCK_ISP, CMD_READ_SIGNATURE_ISP and CMD_READ_OSCCAL commands,
 422  *  reading the requested configuration byte from the device.
 423  *
 424  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 425  */
 426 void ISPProtocol_ReadFuseLockSigOSCCAL(uint8_t V2Command)
 427 {
 428         struct
 429         {
 430                 uint8_t RetByte;
 431                 uint8_t ReadCommandBytes[4];
 432         } Read_FuseLockSigOSCCAL_Params;
 433
 434         Endpoint_Read_Stream_LE(&Read_FuseLockSigOSCCAL_Params, sizeof(Read_FuseLockSigOSCCAL_Params), NO_STREAM_CALLBACK);
 435
 436         Endpoint_ClearOUT();
 437         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 438         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 439
 440         uint8_t ResponseBytes[4];
 441
 442         /* Send the Fuse or Lock byte read commands as given by the host to the device, store response */
 443         for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
 444           ResponseBytes[RByte] = ISPTarget_TransferByte(Read_FuseLockSigOSCCAL_Params.ReadCommandBytes[RByte]);
 445
 446         Endpoint_Write_Byte(V2Command);
 447         Endpoint_Write_Byte(STATUS_CMD_OK);
 448         Endpoint_Write_Byte(ResponseBytes[Read_FuseLockSigOSCCAL_Params.RetByte - 1]);
 449         Endpoint_Write_Byte(STATUS_CMD_OK);
 450         Endpoint_ClearIN();
 451 }
 452
 453 /** Handler for the CMD_WRITE_FUSE_ISP and CMD_WRITE_LOCK_ISP commands, writing the requested configuration
 454  *  byte to the device.
 455  *
 456  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 457  */
 458 void ISPProtocol_WriteFuseLock(uint8_t V2Command)
 459 {
 460         struct
 461         {
 462                 uint8_t WriteCommandBytes[4];
 463         } Write_FuseLockSig_Params;
 464
 465         Endpoint_Read_Stream_LE(&Write_FuseLockSig_Params, sizeof(Write_FuseLockSig_Params), NO_STREAM_CALLBACK);
 466
 467         Endpoint_ClearOUT();
 468         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 469         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 470
 471         /* Send the Fuse or Lock byte program commands as given by the host to the device */
 472         for (uint8_t SByte = 0; SByte < sizeof(Write_FuseLockSig_Params.WriteCommandBytes); SByte++)
 473           ISPTarget_SendByte(Write_FuseLockSig_Params.WriteCommandBytes[SByte]);
 474
 475         Endpoint_Write_Byte(V2Command);
 476         Endpoint_Write_Byte(STATUS_CMD_OK);
 477         Endpoint_Write_Byte(STATUS_CMD_OK);
 478         Endpoint_ClearIN();
 479 }
 480
 481 /** Handler for the CMD_SPI_MULTI command, writing and reading arbitrary SPI data to and from the attached device. */
 482 void ISPProtocol_SPIMulti(void)
 483 {
 484         struct
 485         {
 486                 uint8_t TxBytes;
 487                 uint8_t RxBytes;
 488                 uint8_t RxStartAddr;
 489                 uint8_t TxData[255];
 490         } SPI_Multi_Params;
 491
 492         Endpoint_Read_Stream_LE(&SPI_Multi_Params, (sizeof(SPI_Multi_Params) - sizeof(SPI_Multi_Params.TxData)), NO_STREAM_CALLBACK);
 493         Endpoint_Read_Stream_LE(&SPI_Multi_Params.TxData, SPI_Multi_Params.TxBytes, NO_STREAM_CALLBACK);
 494
 495         Endpoint_ClearOUT();
 496         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 497         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 498
 499         Endpoint_Write_Byte(CMD_SPI_MULTI);
 500         Endpoint_Write_Byte(STATUS_CMD_OK);
 501
 502         uint8_t CurrTxPos = 0;
 503         uint8_t CurrRxPos = 0;
 504
 505         /* Write out bytes to transmit until the start of the bytes to receive is met */
 506         while (CurrTxPos < SPI_Multi_Params.RxStartAddr)
 507         {
 508                 if (CurrTxPos < SPI_Multi_Params.TxBytes)
 509                   ISPTarget_SendByte(SPI_Multi_Params.TxData[CurrTxPos]);
 510                 else
 511                   ISPTarget_SendByte(0);
 512
 513                 CurrTxPos++;
 514         }
 515
 516         /* Transmit remaining bytes with padding as needed, read in response bytes */
 517         while (CurrRxPos < SPI_Multi_Params.RxBytes)
 518         {
 519                 if (CurrTxPos < SPI_Multi_Params.TxBytes)
 520                   Endpoint_Write_Byte(ISPTarget_TransferByte(SPI_Multi_Params.TxData[CurrTxPos++]));
 521                 else
 522                   Endpoint_Write_Byte(ISPTarget_ReceiveByte());
 523
 524                 /* Check to see if we have filled the endpoint bank and need to send the packet */
 525                 if (!(Endpoint_IsReadWriteAllowed()))
 526                 {
 527                         Endpoint_ClearIN();
 528                         Endpoint_WaitUntilReady();
 529                 }
 530
 531                 CurrRxPos++;
 532         }
 533
 534         Endpoint_Write_Byte(STATUS_CMD_OK);
 535
 536         bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 537         Endpoint_ClearIN();
 538
 539         /* Ensure last packet is a short packet to terminate the transfer */
 540         if (IsEndpointFull)
 541         {
 542                 Endpoint_WaitUntilReady();
 543                 Endpoint_ClearIN();
 544                 Endpoint_WaitUntilReady();
 545         }
 546 }
 547
 548 /** Blocking delay for a given number of milliseconds.
 549  *
 550  *  \param[in] DelayMS  Number of milliseconds to delay for
 551  */
 552 void ISPProtocol_DelayMS(uint8_t DelayMS)
 553 {
 554         while (DelayMS-- && TimeoutTicksRemaining)
 555           _delay_ms(1);
 556 }
 557
 558 #endif