Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  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), NULL);
  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         ISPTarget_ChangeTargetResetLine(true);
  72
  73         /* Continuously attempt to synchronize with the target until either the number of attempts specified
  74          * by the host has exceeded, or the the device sends back the expected response values */
  75         while (Enter_ISP_Params.SynchLoops-- && (ResponseStatus != STATUS_CMD_OK) && !(TimeoutExpired))
  76         {
  77                 uint8_t ResponseBytes[4];
  78
  79                 for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
  80                 {
  81                         ISPProtocol_DelayMS(Enter_ISP_Params.ByteDelay);
  82                         ResponseBytes[RByte] = ISPTarget_TransferByte(Enter_ISP_Params.EnterProgBytes[RByte]);
  83                 }
  84
  85                 /* Check if polling disabled, or if the polled value matches the expected value */
  86                 if (!(Enter_ISP_Params.PollIndex) || (ResponseBytes[Enter_ISP_Params.PollIndex - 1] == Enter_ISP_Params.PollValue))
  87                 {
  88                         ResponseStatus = STATUS_CMD_OK;
  89                 }
  90                 else
  91                 {
  92                         ISPTarget_ChangeTargetResetLine(false);
  93                         ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
  94                         ISPTarget_ChangeTargetResetLine(true);
  95                 }
  96         }
  97
  98         Endpoint_Write_8(CMD_ENTER_PROGMODE_ISP);
  99         Endpoint_Write_8(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), NULL);
 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_8(CMD_LEAVE_PROGMODE_ISP);
 125         Endpoint_Write_8(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)), NULL);
 149         Write_Memory_Params.BytesToWrite = SwapEndian_16(Write_Memory_Params.BytesToWrite);
 150
 151         if (Write_Memory_Params.BytesToWrite > sizeof(Write_Memory_Params.ProgData))
 152         {
 153                 Endpoint_ClearOUT();
 154                 Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 155                 Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 156
 157                 Endpoint_Write_8(V2Command);
 158                 Endpoint_Write_8(STATUS_CMD_FAILED);
 159                 Endpoint_ClearIN();
 160                 return;
 161         }
 162
 163         Endpoint_Read_Stream_LE(&Write_Memory_Params.ProgData, Write_Memory_Params.BytesToWrite, NULL);
 164
 165         // The driver will terminate transfers that are a round multiple of the endpoint bank in size with a ZLP, need
 166         // to catch this and discard it before continuing on with packet processing to prevent communication issues
 167         if (((sizeof(uint8_t) + sizeof(Write_Memory_Params) - sizeof(Write_Memory_Params.ProgData)) +
 168             Write_Memory_Params.BytesToWrite) % AVRISP_DATA_EPSIZE == 0)
 169         {
 170                 Endpoint_ClearOUT();
 171                 Endpoint_WaitUntilReady();
 172         }
 173
 174         Endpoint_ClearOUT();
 175         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 176         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 177
 178         uint8_t  ProgrammingStatus = STATUS_CMD_OK;
 179         uint8_t  PollValue         = (V2Command == CMD_PROGRAM_FLASH_ISP) ? Write_Memory_Params.PollValue1 :
 180                                                                             Write_Memory_Params.PollValue2;
 181         uint16_t PollAddress       = 0;
 182         uint8_t* NextWriteByte     = Write_Memory_Params.ProgData;
 183         uint16_t PageStartAddress  = (CurrentAddress & 0xFFFF);
 184
 185         for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
 186         {
 187                 uint8_t ByteToWrite     = *(NextWriteByte++);
 188                 uint8_t ProgrammingMode = Write_Memory_Params.ProgrammingMode;
 189
 190                 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
 191                 if (MustLoadExtendedAddress)
 192                 {
 193                         ISPTarget_LoadExtendedAddress();
 194                         MustLoadExtendedAddress = false;
 195                 }
 196
 197                 ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
 198                 ISPTarget_SendByte(CurrentAddress >> 8);
 199                 ISPTarget_SendByte(CurrentAddress & 0xFF);
 200                 ISPTarget_SendByte(ByteToWrite);
 201
 202                 /* AVR FLASH addressing requires us to modify the write command based on if we are writing a high
 203                  * or low byte at the current word address */
 204                 if (V2Command == CMD_PROGRAM_FLASH_ISP)
 205                   Write_Memory_Params.ProgrammingCommands[0] ^= READ_WRITE_HIGH_BYTE_MASK;
 206
 207                 /* Check to see if we have a valid polling address */
 208                 if (!(PollAddress) && (ByteToWrite != PollValue))
 209                 {
 210                         if ((CurrentByte & 0x01) && (V2Command == CMD_PROGRAM_FLASH_ISP))
 211                           Write_Memory_Params.ProgrammingCommands[2] |=  READ_WRITE_HIGH_BYTE_MASK;
 212                         else
 213                           Write_Memory_Params.ProgrammingCommands[2] &= ~READ_WRITE_HIGH_BYTE_MASK;
 214
 215                         PollAddress = (CurrentAddress & 0xFFFF);
 216                 }
 217
 218                 /* If in word programming mode, commit the byte to the target's memory */
 219                 if (!(ProgrammingMode & PROG_MODE_PAGED_WRITES_MASK))
 220                 {
 221                         /* If the current polling address is invalid, switch to timed delay write completion mode */
 222                         if (!(PollAddress) && !(ProgrammingMode & PROG_MODE_WORD_READYBUSY_MASK))
 223                           ProgrammingMode = (ProgrammingMode & ~PROG_MODE_WORD_VALUE_MASK) | PROG_MODE_WORD_TIMEDELAY_MASK;
 224
 225                         ProgrammingStatus = ISPTarget_WaitForProgComplete(ProgrammingMode, PollAddress, PollValue,
 226                                                                           Write_Memory_Params.DelayMS,
 227                                                                           Write_Memory_Params.ProgrammingCommands[2]);
 228
 229                         /* Abort the programming loop early if the byte/word programming failed */
 230                         if (ProgrammingStatus != STATUS_CMD_OK)
 231                           break;
 232
 233                         /* Must reset the polling address afterwards, so it is not erroneously used for the next byte */
 234                         PollAddress = 0;
 235                 }
 236
 237                 /* EEPROM just increments the address each byte, flash needs to increment on each word and
 238                  * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
 239                  * address boundary has been crossed during FLASH memory programming */
 240                 if ((CurrentByte & 0x01) || (V2Command == CMD_PROGRAM_EEPROM_ISP))
 241                 {
 242                         CurrentAddress++;
 243
 244                         if ((V2Command == CMD_PROGRAM_FLASH_ISP) && !(CurrentAddress & 0xFFFF))
 245                           MustLoadExtendedAddress = true;
 246                 }
 247         }
 248
 249         /* If the current page must be committed, send the PROGRAM PAGE command to the target */
 250         if (Write_Memory_Params.ProgrammingMode & PROG_MODE_COMMIT_PAGE_MASK)
 251         {
 252                 ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[1]);
 253                 ISPTarget_SendByte(PageStartAddress >> 8);
 254                 ISPTarget_SendByte(PageStartAddress & 0xFF);
 255                 ISPTarget_SendByte(0x00);
 256
 257                 /* Check if polling is enabled and possible, if not switch to timed delay mode */
 258                 if ((Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_VALUE_MASK) && !(PollAddress))
 259                 {
 260                         Write_Memory_Params.ProgrammingMode = (Write_Memory_Params.ProgrammingMode & ~PROG_MODE_PAGED_VALUE_MASK) |
 261                                                                                                    PROG_MODE_PAGED_TIMEDELAY_MASK;
 262                 }
 263
 264                 ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
 265                                                                   Write_Memory_Params.DelayMS,
 266                                                                   Write_Memory_Params.ProgrammingCommands[2]);
 267
 268                 /* Check to see if the FLASH address has crossed the extended address boundary */
 269                 if ((V2Command == CMD_PROGRAM_FLASH_ISP) && !(CurrentAddress & 0xFFFF))
 270                   MustLoadExtendedAddress = true;
 271         }
 272
 273         Endpoint_Write_8(V2Command);
 274         Endpoint_Write_8(ProgrammingStatus);
 275         Endpoint_ClearIN();
 276 }
 277
 278 /** Handler for the CMD_READ_FLASH_ISP and CMD_READ_EEPROM_ISP commands, reading in bytes,
 279  *  words or pages of data from the attached device.
 280  *
 281  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 282  */
 283 void ISPProtocol_ReadMemory(uint8_t V2Command)
 284 {
 285         struct
 286         {
 287                 uint16_t BytesToRead;
 288                 uint8_t  ReadMemoryCommand;
 289         } Read_Memory_Params;
 290
 291         Endpoint_Read_Stream_LE(&Read_Memory_Params, sizeof(Read_Memory_Params), NULL);
 292         Read_Memory_Params.BytesToRead = SwapEndian_16(Read_Memory_Params.BytesToRead);
 293
 294         Endpoint_ClearOUT();
 295         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 296         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 297
 298         Endpoint_Write_8(V2Command);
 299         Endpoint_Write_8(STATUS_CMD_OK);
 300
 301         /* Read each byte from the device and write them to the packet for the host */
 302         for (uint16_t CurrentByte = 0; CurrentByte < Read_Memory_Params.BytesToRead; CurrentByte++)
 303         {
 304                 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
 305                 if (MustLoadExtendedAddress)
 306                 {
 307                         ISPTarget_LoadExtendedAddress();
 308                         MustLoadExtendedAddress = false;
 309                 }
 310
 311                 /* Read the next byte from the desired memory space in the device */
 312                 ISPTarget_SendByte(Read_Memory_Params.ReadMemoryCommand);
 313                 ISPTarget_SendByte(CurrentAddress >> 8);
 314                 ISPTarget_SendByte(CurrentAddress & 0xFF);
 315                 Endpoint_Write_8(ISPTarget_ReceiveByte());
 316
 317                 /* Check if the endpoint bank is currently full, if so send the packet */
 318                 if (!(Endpoint_IsReadWriteAllowed()))
 319                 {
 320                         Endpoint_ClearIN();
 321                         Endpoint_WaitUntilReady();
 322                 }
 323
 324                 /* AVR FLASH addressing requires us to modify the read command based on if we are reading a high
 325                  * or low byte at the current word address */
 326                 if (V2Command == CMD_READ_FLASH_ISP)
 327                   Read_Memory_Params.ReadMemoryCommand ^= READ_WRITE_HIGH_BYTE_MASK;
 328
 329                 /* EEPROM just increments the address each byte, flash needs to increment on each word and
 330                  * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
 331                  * address boundary has been crossed */
 332                 if ((CurrentByte & 0x01) || (V2Command == CMD_READ_EEPROM_ISP))
 333                 {
 334                         CurrentAddress++;
 335
 336                         if ((V2Command != CMD_READ_EEPROM_ISP) && !(CurrentAddress & 0xFFFF))
 337                           MustLoadExtendedAddress = true;
 338                 }
 339         }
 340
 341         Endpoint_Write_8(STATUS_CMD_OK);
 342
 343         bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 344         Endpoint_ClearIN();
 345
 346         /* Ensure last packet is a short packet to terminate the transfer */
 347         if (IsEndpointFull)
 348         {
 349                 Endpoint_WaitUntilReady();
 350                 Endpoint_ClearIN();
 351                 Endpoint_WaitUntilReady();
 352         }
 353 }
 354
 355 /** Handler for the CMD_CHI_ERASE_ISP command, clearing the target's FLASH memory. */
 356 void ISPProtocol_ChipErase(void)
 357 {
 358         struct
 359         {
 360                 uint8_t EraseDelayMS;
 361                 uint8_t PollMethod;
 362                 uint8_t EraseCommandBytes[4];
 363         } Erase_Chip_Params;
 364
 365         Endpoint_Read_Stream_LE(&Erase_Chip_Params, sizeof(Erase_Chip_Params), NULL);
 366
 367         Endpoint_ClearOUT();
 368         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 369         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 370
 371         uint8_t ResponseStatus = STATUS_CMD_OK;
 372
 373         /* Send the chip erase commands as given by the host to the device */
 374         for (uint8_t SByte = 0; SByte < sizeof(Erase_Chip_Params.EraseCommandBytes); SByte++)
 375           ISPTarget_SendByte(Erase_Chip_Params.EraseCommandBytes[SByte]);
 376
 377         /* Use appropriate command completion check as given by the host (delay or busy polling) */
 378         if (!(Erase_Chip_Params.PollMethod))
 379           ISPProtocol_DelayMS(Erase_Chip_Params.EraseDelayMS);
 380         else
 381           ResponseStatus = ISPTarget_WaitWhileTargetBusy();
 382
 383         Endpoint_Write_8(CMD_CHIP_ERASE_ISP);
 384         Endpoint_Write_8(ResponseStatus);
 385         Endpoint_ClearIN();
 386 }
 387
 388 /** Handler for the CMD_READ_FUSE_ISP, CMD_READ_LOCK_ISP, CMD_READ_SIGNATURE_ISP and CMD_READ_OSCCAL commands,
 389  *  reading the requested configuration byte from the device.
 390  *
 391  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 392  */
 393 void ISPProtocol_ReadFuseLockSigOSCCAL(uint8_t V2Command)
 394 {
 395         struct
 396         {
 397                 uint8_t RetByte;
 398                 uint8_t ReadCommandBytes[4];
 399         } Read_FuseLockSigOSCCAL_Params;
 400
 401         Endpoint_Read_Stream_LE(&Read_FuseLockSigOSCCAL_Params, sizeof(Read_FuseLockSigOSCCAL_Params), NULL);
 402
 403         Endpoint_ClearOUT();
 404         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 405         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 406
 407         uint8_t ResponseBytes[4];
 408
 409         /* Send the Fuse or Lock byte read commands as given by the host to the device, store response */
 410         for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
 411           ResponseBytes[RByte] = ISPTarget_TransferByte(Read_FuseLockSigOSCCAL_Params.ReadCommandBytes[RByte]);
 412
 413         Endpoint_Write_8(V2Command);
 414         Endpoint_Write_8(STATUS_CMD_OK);
 415         Endpoint_Write_8(ResponseBytes[Read_FuseLockSigOSCCAL_Params.RetByte - 1]);
 416         Endpoint_Write_8(STATUS_CMD_OK);
 417         Endpoint_ClearIN();
 418 }
 419
 420 /** Handler for the CMD_WRITE_FUSE_ISP and CMD_WRITE_LOCK_ISP commands, writing the requested configuration
 421  *  byte to the device.
 422  *
 423  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 424  */
 425 void ISPProtocol_WriteFuseLock(uint8_t V2Command)
 426 {
 427         struct
 428         {
 429                 uint8_t WriteCommandBytes[4];
 430         } Write_FuseLockSig_Params;
 431
 432         Endpoint_Read_Stream_LE(&Write_FuseLockSig_Params, sizeof(Write_FuseLockSig_Params), NULL);
 433
 434         Endpoint_ClearOUT();
 435         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 436         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 437
 438         /* Send the Fuse or Lock byte program commands as given by the host to the device */
 439         for (uint8_t SByte = 0; SByte < sizeof(Write_FuseLockSig_Params.WriteCommandBytes); SByte++)
 440           ISPTarget_SendByte(Write_FuseLockSig_Params.WriteCommandBytes[SByte]);
 441
 442         Endpoint_Write_8(V2Command);
 443         Endpoint_Write_8(STATUS_CMD_OK);
 444         Endpoint_Write_8(STATUS_CMD_OK);
 445         Endpoint_ClearIN();
 446 }
 447
 448 /** Handler for the CMD_SPI_MULTI command, writing and reading arbitrary SPI data to and from the attached device. */
 449 void ISPProtocol_SPIMulti(void)
 450 {
 451         struct
 452         {
 453                 uint8_t TxBytes;
 454                 uint8_t RxBytes;
 455                 uint8_t RxStartAddr;
 456                 uint8_t TxData[255];
 457         } SPI_Multi_Params;
 458
 459         Endpoint_Read_Stream_LE(&SPI_Multi_Params, (sizeof(SPI_Multi_Params) - sizeof(SPI_Multi_Params.TxData)), NULL);
 460         Endpoint_Read_Stream_LE(&SPI_Multi_Params.TxData, SPI_Multi_Params.TxBytes, NULL);
 461
 462         Endpoint_ClearOUT();
 463         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 464         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 465
 466         Endpoint_Write_8(CMD_SPI_MULTI);
 467         Endpoint_Write_8(STATUS_CMD_OK);
 468
 469         uint8_t CurrTxPos = 0;
 470         uint8_t CurrRxPos = 0;
 471
 472         /* Write out bytes to transmit until the start of the bytes to receive is met */
 473         while (CurrTxPos < SPI_Multi_Params.RxStartAddr)
 474         {
 475                 if (CurrTxPos < SPI_Multi_Params.TxBytes)
 476                   ISPTarget_SendByte(SPI_Multi_Params.TxData[CurrTxPos]);
 477                 else
 478                   ISPTarget_SendByte(0);
 479
 480                 CurrTxPos++;
 481         }
 482
 483         /* Transmit remaining bytes with padding as needed, read in response bytes */
 484         while (CurrRxPos < SPI_Multi_Params.RxBytes)
 485         {
 486                 if (CurrTxPos < SPI_Multi_Params.TxBytes)
 487                   Endpoint_Write_8(ISPTarget_TransferByte(SPI_Multi_Params.TxData[CurrTxPos++]));
 488                 else
 489                   Endpoint_Write_8(ISPTarget_ReceiveByte());
 490
 491                 /* Check to see if we have filled the endpoint bank and need to send the packet */
 492                 if (!(Endpoint_IsReadWriteAllowed()))
 493                 {
 494                         Endpoint_ClearIN();
 495                         Endpoint_WaitUntilReady();
 496                 }
 497
 498                 CurrRxPos++;
 499         }
 500
 501         Endpoint_Write_8(STATUS_CMD_OK);
 502
 503         bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 504         Endpoint_ClearIN();
 505
 506         /* Ensure last packet is a short packet to terminate the transfer */
 507         if (IsEndpointFull)
 508         {
 509                 Endpoint_WaitUntilReady();
 510                 Endpoint_ClearIN();
 511                 Endpoint_WaitUntilReady();
 512         }
 513 }
 514
 515 /** Blocking delay for a given number of milliseconds.
 516  *
 517  *  \param[in] DelayMS  Number of milliseconds to delay for
 518  */
 519 void ISPProtocol_DelayMS(uint8_t DelayMS)
 520 {
 521         while (DelayMS-- && !(TimeoutExpired))
 522           Delay_MS(1);
 523 }
 524
 525 #endif