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_SetEndpointDirection(ENDPOINT_DIR_IN);
  61
  62         uint8_t ResponseStatus = STATUS_CMD_FAILED;
  63
  64         CurrentAddress = 0;
  65
  66         /* Set up the synchronous USART to generate the recovery clock on XCK pin */
  67         UBRR1  = (F_CPU / 500000UL);
  68         UCSR1B = (1 << TXEN1);
  69         UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
  70         DDRD  |= (1 << 5);
  71
  72         /* Perform execution delay, initialize SPI bus */
  73         ISPProtocol_DelayMS(Enter_ISP_Params.ExecutionDelayMS);
  74         SPI_Init(ISPTarget_GetSPIPrescalerMask() | SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING | SPI_MODE_MASTER);
  75
  76         /* Continuously attempt to synchronize with the target until either the number of attempts specified
  77          * by the host has exceeded, or the the device sends back the expected response values */
  78         while (Enter_ISP_Params.SynchLoops-- && (ResponseStatus == STATUS_CMD_FAILED) && TimeoutMSRemaining)
  79         {
  80                 uint8_t ResponseBytes[4];
  81
  82                 ISPTarget_ChangeTargetResetLine(true);
  83                 ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
  84
  85                 for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
  86                 {
  87                         ISPProtocol_DelayMS(Enter_ISP_Params.ByteDelay);
  88                         ResponseBytes[RByte] = SPI_TransferByte(Enter_ISP_Params.EnterProgBytes[RByte]);
  89                 }
  90
  91                 /* Check if polling disabled, or if the polled value matches the expected value */
  92                 if (!(Enter_ISP_Params.PollIndex) || (ResponseBytes[Enter_ISP_Params.PollIndex - 1] == Enter_ISP_Params.PollValue))
  93                 {
  94                         ResponseStatus = STATUS_CMD_OK;
  95                 }
  96                 else
  97                 {
  98                         ISPTarget_ChangeTargetResetLine(false);
  99                         ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
 100                 }
 101         }
 102
 103         Endpoint_Write_Byte(CMD_ENTER_PROGMODE_ISP);
 104         Endpoint_Write_Byte(ResponseStatus);
 105         Endpoint_ClearIN();
 106 }
 107
 108 /** Handler for the CMD_LEAVE_ISP command, which releases the target from programming mode. */
 109 void ISPProtocol_LeaveISPMode(void)
 110 {
 111         struct
 112         {
 113                 uint8_t PreDelayMS;
 114                 uint8_t PostDelayMS;
 115         } Leave_ISP_Params;
 116
 117         Endpoint_Read_Stream_LE(&Leave_ISP_Params, sizeof(Leave_ISP_Params), NO_STREAM_CALLBACK);
 118
 119         Endpoint_ClearOUT();
 120         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 121
 122         /* Perform pre-exit delay, release the target /RESET, disable the SPI bus and perform the post-exit delay */
 123         ISPProtocol_DelayMS(Leave_ISP_Params.PreDelayMS);
 124         ISPTarget_ChangeTargetResetLine(false);
 125         SPI_ShutDown();
 126         ISPProtocol_DelayMS(Leave_ISP_Params.PostDelayMS);
 127
 128         /* Turn off the synchronous USART to terminate the recovery clock on XCK pin */
 129         UBRR1  = (F_CPU / 500000UL);
 130         UCSR1B = (1 << TXEN1);
 131         UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
 132         DDRD  &= ~(1 << 5);
 133
 134         Endpoint_Write_Byte(CMD_LEAVE_PROGMODE_ISP);
 135         Endpoint_Write_Byte(STATUS_CMD_OK);
 136         Endpoint_ClearIN();
 137 }
 138
 139 /** Handler for the CMD_PROGRAM_FLASH_ISP and CMD_PROGRAM_EEPROM_ISP commands, writing out bytes,
 140  *  words or pages of data to the attached device.
 141  *
 142  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 143  */
 144 void ISPProtocol_ProgramMemory(uint8_t V2Command)
 145 {
 146         struct
 147         {
 148                 uint16_t BytesToWrite;
 149                 uint8_t  ProgrammingMode;
 150                 uint8_t  DelayMS;
 151                 uint8_t  ProgrammingCommands[3];
 152                 uint8_t  PollValue1;
 153                 uint8_t  PollValue2;
 154                 uint8_t  ProgData[256]; // Note, the Jungo driver has a very short ACK timeout period, need to buffer the
 155         } Write_Memory_Params;      // whole page and ACK the packet as fast as possible to prevent it from aborting
 156
 157         Endpoint_Read_Stream_LE(&Write_Memory_Params, (sizeof(Write_Memory_Params) -
 158                                                        sizeof(Write_Memory_Params.ProgData)), NO_STREAM_CALLBACK);
 159
 160
 161         Write_Memory_Params.BytesToWrite = SwapEndian_16(Write_Memory_Params.BytesToWrite);
 162
 163         if (Write_Memory_Params.BytesToWrite > sizeof(Write_Memory_Params.ProgData))
 164         {
 165                 Endpoint_ClearOUT();
 166                 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 167
 168                 Endpoint_Write_Byte(V2Command);
 169                 Endpoint_Write_Byte(STATUS_CMD_FAILED);
 170                 Endpoint_ClearIN();
 171                 return;
 172         }
 173
 174         Endpoint_Read_Stream_LE(&Write_Memory_Params.ProgData, Write_Memory_Params.BytesToWrite, NO_STREAM_CALLBACK);
 175
 176         Endpoint_ClearOUT();
 177         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 178
 179         uint8_t  ProgrammingStatus = STATUS_CMD_OK;
 180         uint16_t PollAddress       = 0;
 181         uint8_t  PollValue         = (V2Command == CMD_PROGRAM_FLASH_ISP) ? Write_Memory_Params.PollValue1 :
 182                                                                             Write_Memory_Params.PollValue2;
 183         uint8_t* NextWriteByte = Write_Memory_Params.ProgData;
 184
 185         /* Check to see if the host has issued a SET ADDRESS command and we haven't sent a
 186          * LOAD EXTENDED ADDRESS command (if needed, used when operating beyond the 128KB
 187          * FLASH barrier) */
 188         if (MustSetAddress)
 189         {
 190                 if (CurrentAddress & (1UL << 31))
 191                   ISPTarget_LoadExtendedAddress();
 192
 193                 MustSetAddress = false;
 194         }
 195
 196         /* Check the programming mode desired by the host, either Paged or Word memory writes */
 197         if (Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_WRITES_MASK)
 198         {
 199                 uint16_t StartAddress = (CurrentAddress & 0xFFFF);
 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                         SPI_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
 208                         SPI_SendByte(CurrentAddress >> 8);
 209                         SPI_SendByte(CurrentAddress & 0xFF);
 210                         SPI_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                         if (IsOddByte || (V2Command == CMD_PROGRAM_EEPROM_ISP))
 227                           CurrentAddress++;
 228                 }
 229
 230                 /* If the current page must be committed, send the PROGRAM PAGE command to the target */
 231                 if (Write_Memory_Params.ProgrammingMode & PROG_MODE_COMMIT_PAGE_MASK)
 232                 {
 233                         SPI_SendByte(Write_Memory_Params.ProgrammingCommands[1]);
 234                         SPI_SendByte(StartAddress >> 8);
 235                         SPI_SendByte(StartAddress & 0xFF);
 236                         SPI_SendByte(0x00);
 237
 238                         /* Check if polling is possible, if not switch to timed delay mode */
 239                         if (!(PollAddress))
 240                         {
 241                                 Write_Memory_Params.ProgrammingMode &= ~PROG_MODE_PAGED_VALUE_MASK;
 242                                 Write_Memory_Params.ProgrammingMode |=  PROG_MODE_PAGED_TIMEDELAY_MASK;
 243                         }
 244
 245                         ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
 246                                                                           Write_Memory_Params.DelayMS, Write_Memory_Params.ProgrammingCommands[2]);
 247                 }
 248         }
 249         else
 250         {
 251                 /* Word/byte mode memory programming */
 252                 for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
 253                 {
 254                         bool    IsOddByte   = (CurrentByte & 0x01);
 255                         uint8_t ByteToWrite = *(NextWriteByte++);
 256
 257                         SPI_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
 258                         SPI_SendByte(CurrentAddress >> 8);
 259                         SPI_SendByte(CurrentAddress & 0xFF);
 260                         SPI_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                         if (ByteToWrite != PollValue)
 268                         {
 269                                 if (IsOddByte && (V2Command == CMD_PROGRAM_FLASH_ISP))
 270                                   Write_Memory_Params.ProgrammingCommands[2] |= READ_WRITE_HIGH_BYTE_MASK;
 271
 272                                 PollAddress = (CurrentAddress & 0xFFFF);
 273                         }
 274
 275                         if (IsOddByte || (V2Command == CMD_PROGRAM_EEPROM_ISP))
 276                           CurrentAddress++;
 277
 278                         ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
 279                                                                           Write_Memory_Params.DelayMS, Write_Memory_Params.ProgrammingCommands[2]);
 280
 281                         if (ProgrammingStatus != STATUS_CMD_OK)
 282                           break;
 283                 }
 284         }
 285
 286         Endpoint_Write_Byte(V2Command);
 287         Endpoint_Write_Byte(ProgrammingStatus);
 288         Endpoint_ClearIN();
 289 }
 290
 291 /** Handler for the CMD_READ_FLASH_ISP and CMD_READ_EEPROM_ISP commands, reading in bytes,
 292  *  words or pages of data from the attached device.
 293  *
 294  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 295  */
 296 void ISPProtocol_ReadMemory(uint8_t V2Command)
 297 {
 298         struct
 299         {
 300                 uint16_t BytesToRead;
 301                 uint8_t  ReadMemoryCommand;
 302         } Read_Memory_Params;
 303
 304         Endpoint_Read_Stream_LE(&Read_Memory_Params, sizeof(Read_Memory_Params), NO_STREAM_CALLBACK);
 305         Read_Memory_Params.BytesToRead = SwapEndian_16(Read_Memory_Params.BytesToRead);
 306
 307         Endpoint_ClearOUT();
 308         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 309
 310         Endpoint_Write_Byte(V2Command);
 311         Endpoint_Write_Byte(STATUS_CMD_OK);
 312
 313         /* Check to see if the host has issued a SET ADDRESS command and we haven't sent a
 314          * LOAD EXTENDED ADDRESS command (if needed, used when operating beyond the 128KB
 315          * FLASH barrier) */
 316         if (MustSetAddress)
 317         {
 318                 if (CurrentAddress & (1UL << 31))
 319                   ISPTarget_LoadExtendedAddress();
 320
 321                 MustSetAddress = false;
 322         }
 323
 324         /* Read each byte from the device and write them to the packet for the host */
 325         for (uint16_t CurrentByte = 0; CurrentByte < Read_Memory_Params.BytesToRead; CurrentByte++)
 326         {
 327                 /* Read the next byte from the desired memory space in the device */
 328                 SPI_SendByte(Read_Memory_Params.ReadMemoryCommand);
 329                 SPI_SendByte(CurrentAddress >> 8);
 330                 SPI_SendByte(CurrentAddress & 0xFF);
 331                 Endpoint_Write_Byte(SPI_ReceiveByte());
 332
 333                 /* Check if the endpoint bank is currently full, if so send the packet */
 334                 if (!(Endpoint_IsReadWriteAllowed()))
 335                 {
 336                         Endpoint_ClearIN();
 337                         Endpoint_WaitUntilReady();
 338                 }
 339
 340                 /* AVR FLASH addressing requires us to modify the read command based on if we are reading a high
 341                  * or low byte at the current word address */
 342                 if (V2Command == CMD_READ_FLASH_ISP)
 343                   Read_Memory_Params.ReadMemoryCommand ^= READ_WRITE_HIGH_BYTE_MASK;
 344
 345                 /* Only increment the current address if we have read both bytes in the current word when in FLASH
 346                  * read mode, or for each byte when in EEPROM read mode */
 347                 if (((CurrentByte & 0x01) && (V2Command == CMD_READ_FLASH_ISP)) || (V2Command == CMD_READ_EEPROM_ISP))
 348                   CurrentAddress++;
 349         }
 350
 351         Endpoint_Write_Byte(STATUS_CMD_OK);
 352
 353         bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 354         Endpoint_ClearIN();
 355
 356         /* Ensure last packet is a short packet to terminate the transfer */
 357         if (IsEndpointFull)
 358         {
 359                 Endpoint_WaitUntilReady();
 360                 Endpoint_ClearIN();
 361                 Endpoint_WaitUntilReady();
 362         }
 363 }
 364
 365 /** Handler for the CMD_CHI_ERASE_ISP command, clearing the target's FLASH memory. */
 366 void ISPProtocol_ChipErase(void)
 367 {
 368         struct
 369         {
 370                 uint8_t EraseDelayMS;
 371                 uint8_t PollMethod;
 372                 uint8_t EraseCommandBytes[4];
 373         } Erase_Chip_Params;
 374
 375         Endpoint_Read_Stream_LE(&Erase_Chip_Params, sizeof(Erase_Chip_Params), NO_STREAM_CALLBACK);
 376
 377         Endpoint_ClearOUT();
 378         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 379
 380         uint8_t ResponseStatus = STATUS_CMD_OK;
 381
 382         /* Send the chip erase commands as given by the host to the device */
 383         for (uint8_t SByte = 0; SByte < sizeof(Erase_Chip_Params.EraseCommandBytes); SByte++)
 384           SPI_SendByte(Erase_Chip_Params.EraseCommandBytes[SByte]);
 385
 386         /* Use appropriate command completion check as given by the host (delay or busy polling) */
 387         if (!(Erase_Chip_Params.PollMethod))
 388           ISPProtocol_DelayMS(Erase_Chip_Params.EraseDelayMS);
 389         else
 390           ResponseStatus = ISPTarget_WaitWhileTargetBusy();
 391
 392         Endpoint_Write_Byte(CMD_CHIP_ERASE_ISP);
 393         Endpoint_Write_Byte(ResponseStatus);
 394         Endpoint_ClearIN();
 395 }
 396
 397 /** Handler for the CMD_READ_FUSE_ISP, CMD_READ_LOCK_ISP, CMD_READ_SIGNATURE_ISP and CMD_READ_OSCCAL commands,
 398  *  reading the requested configuration byte from the device.
 399  *
 400  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 401  */
 402 void ISPProtocol_ReadFuseLockSigOSCCAL(uint8_t V2Command)
 403 {
 404         struct
 405         {
 406                 uint8_t RetByte;
 407                 uint8_t ReadCommandBytes[4];
 408         } Read_FuseLockSigOSCCAL_Params;
 409
 410         Endpoint_Read_Stream_LE(&Read_FuseLockSigOSCCAL_Params, sizeof(Read_FuseLockSigOSCCAL_Params), NO_STREAM_CALLBACK);
 411
 412         Endpoint_ClearOUT();
 413         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 414
 415         uint8_t ResponseBytes[4];
 416
 417         /* Send the Fuse or Lock byte read commands as given by the host to the device, store response */
 418         for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
 419           ResponseBytes[RByte] = SPI_TransferByte(Read_FuseLockSigOSCCAL_Params.ReadCommandBytes[RByte]);
 420
 421         Endpoint_Write_Byte(V2Command);
 422         Endpoint_Write_Byte(STATUS_CMD_OK);
 423         Endpoint_Write_Byte(ResponseBytes[Read_FuseLockSigOSCCAL_Params.RetByte - 1]);
 424         Endpoint_Write_Byte(STATUS_CMD_OK);
 425         Endpoint_ClearIN();
 426 }
 427
 428 /** Handler for the CMD_WRITE_FUSE_ISP and CMD_WRITE_LOCK_ISP commands, writing the requested configuration
 429  *  byte to the device.
 430  *
 431  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 432  */
 433 void ISPProtocol_WriteFuseLock(uint8_t V2Command)
 434 {
 435         struct
 436         {
 437                 uint8_t WriteCommandBytes[4];
 438         } Write_FuseLockSig_Params;
 439
 440         Endpoint_Read_Stream_LE(&Write_FuseLockSig_Params, sizeof(Write_FuseLockSig_Params), NO_STREAM_CALLBACK);
 441
 442         Endpoint_ClearOUT();
 443         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 444
 445         /* Send the Fuse or Lock byte program commands as given by the host to the device */
 446         for (uint8_t SByte = 0; SByte < sizeof(Write_FuseLockSig_Params.WriteCommandBytes); SByte++)
 447           SPI_SendByte(Write_FuseLockSig_Params.WriteCommandBytes[SByte]);
 448
 449         Endpoint_Write_Byte(V2Command);
 450         Endpoint_Write_Byte(STATUS_CMD_OK);
 451         Endpoint_Write_Byte(STATUS_CMD_OK);
 452         Endpoint_ClearIN();
 453 }
 454
 455 /** Handler for the CMD_SPI_MULTI command, writing and reading arbitrary SPI data to and from the attached device. */
 456 void ISPProtocol_SPIMulti(void)
 457 {
 458         struct
 459         {
 460                 uint8_t TxBytes;
 461                 uint8_t RxBytes;
 462                 uint8_t RxStartAddr;
 463                 uint8_t TxData[255];
 464         } SPI_Multi_Params;
 465
 466         Endpoint_Read_Stream_LE(&SPI_Multi_Params, (sizeof(SPI_Multi_Params) - sizeof(SPI_Multi_Params.TxData)), NO_STREAM_CALLBACK);
 467         Endpoint_Read_Stream_LE(&SPI_Multi_Params.TxData, SPI_Multi_Params.TxBytes, NO_STREAM_CALLBACK);
 468
 469         Endpoint_ClearOUT();
 470         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 471
 472         Endpoint_Write_Byte(CMD_SPI_MULTI);
 473         Endpoint_Write_Byte(STATUS_CMD_OK);
 474
 475         uint8_t CurrTxPos = 0;
 476         uint8_t CurrRxPos = 0;
 477
 478         /* Write out bytes to transmit until the start of the bytes to receive is met */
 479         while (CurrTxPos < SPI_Multi_Params.RxStartAddr)
 480         {
 481                 if (CurrTxPos < SPI_Multi_Params.TxBytes)
 482                   SPI_SendByte(SPI_Multi_Params.TxData[CurrTxPos]);
 483                 else
 484                   SPI_SendByte(0);
 485
 486                 CurrTxPos++;
 487         }
 488
 489         /* Transmit remaining bytes with padding as needed, read in response bytes */
 490         while (CurrRxPos < SPI_Multi_Params.RxBytes)
 491         {
 492                 if (CurrTxPos < SPI_Multi_Params.TxBytes)
 493                   Endpoint_Write_Byte(SPI_TransferByte(SPI_Multi_Params.TxData[CurrTxPos++]));
 494                 else
 495                   Endpoint_Write_Byte(SPI_ReceiveByte());
 496
 497                 /* Check to see if we have filled the endpoint bank and need to send the packet */
 498                 if (!(Endpoint_IsReadWriteAllowed()))
 499                 {
 500                         Endpoint_ClearIN();
 501                         Endpoint_WaitUntilReady();
 502                 }
 503
 504                 CurrRxPos++;
 505         }
 506
 507         Endpoint_Write_Byte(STATUS_CMD_OK);
 508
 509         bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 510         Endpoint_ClearIN();
 511
 512         /* Ensure last packet is a short packet to terminate the transfer */
 513         if (IsEndpointFull)
 514         {
 515                 Endpoint_WaitUntilReady();
 516                 Endpoint_ClearIN();
 517                 Endpoint_WaitUntilReady();
 518         }
 519 }
 520
 521 /** Blocking delay for a given number of milliseconds.
 522  *
 523  *  \param[in] DelayMS  Number of milliseconds to delay for
 524  */
 525 void ISPProtocol_DelayMS(uint8_t DelayMS)
 526 {
 527         while (DelayMS-- && TimeoutMSRemaining)
 528         {
 529                 if (TimeoutMSRemaining)
 530                   TimeoutMSRemaining--;
 531
 532                 _delay_ms(1);
 533         }
 534 }
 535
 536 #endif