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         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_Byte(V2Command);
 158                 Endpoint_Write_Byte(STATUS_CMD_FAILED);
 159                 Endpoint_ClearIN();
 160                 return;
 161         }
 162
 163         Endpoint_Read_Stream_LE(&Write_Memory_Params.ProgData, Write_Memory_Params.BytesToWrite, NO_STREAM_CALLBACK);
 164
 165         Endpoint_ClearOUT();
 166         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 167         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 168
 169         uint8_t  ProgrammingStatus = STATUS_CMD_OK;
 170         uint16_t PollAddress       = 0;
 171         uint8_t  PollValue         = (V2Command == CMD_PROGRAM_FLASH_ISP) ? Write_Memory_Params.PollValue1 :
 172                                                                             Write_Memory_Params.PollValue2;
 173         uint8_t* NextWriteByte     = Write_Memory_Params.ProgData;
 174
 175         /* Check the programming mode desired by the host, either Paged or Word memory writes */
 176         if (Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_WRITES_MASK)
 177         {
 178                 uint16_t StartAddress = (CurrentAddress & 0xFFFF);
 179
 180                 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
 181                 if (MustLoadExtendedAddress)
 182                 {
 183                         ISPTarget_LoadExtendedAddress();
 184                         MustLoadExtendedAddress = false;
 185                 }
 186
 187                 /* Paged mode memory programming */
 188                 for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
 189                 {
 190                         bool    IsOddByte   = (CurrentByte & 0x01);
 191                         uint8_t ByteToWrite = *(NextWriteByte++);
 192
 193                         ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
 194                         ISPTarget_SendByte(CurrentAddress >> 8);
 195                         ISPTarget_SendByte(CurrentAddress & 0xFF);
 196                         ISPTarget_SendByte(ByteToWrite);
 197
 198                         /* AVR FLASH addressing requires us to modify the write command based on if we are writing a high
 199                          * or low byte at the current word address */
 200                         if (V2Command == CMD_PROGRAM_FLASH_ISP)
 201                           Write_Memory_Params.ProgrammingCommands[0] ^= READ_WRITE_HIGH_BYTE_MASK;
 202
 203                         /* Check to see the write completion method, to see if we have a valid polling address */
 204                         if (!(PollAddress) && (ByteToWrite != PollValue))
 205                         {
 206                                 if (IsOddByte && (V2Command == CMD_PROGRAM_FLASH_ISP))
 207                                   Write_Memory_Params.ProgrammingCommands[2] |=  READ_WRITE_HIGH_BYTE_MASK;
 208
 209                                 PollAddress = (CurrentAddress & 0xFFFF);
 210                         }
 211
 212                         /* EEPROM increments the address on each byte, flash needs to increment on each word */
 213                         if (IsOddByte || (V2Command == CMD_PROGRAM_EEPROM_ISP))
 214                           CurrentAddress++;
 215                 }
 216
 217                 /* If the current page must be committed, send the PROGRAM PAGE command to the target */
 218                 if (Write_Memory_Params.ProgrammingMode & PROG_MODE_COMMIT_PAGE_MASK)
 219                 {
 220                         ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[1]);
 221                         ISPTarget_SendByte(StartAddress >> 8);
 222                         ISPTarget_SendByte(StartAddress & 0xFF);
 223                         ISPTarget_SendByte(0x00);
 224
 225                         /* Check if polling is enabled and possible, if not switch to timed delay mode */
 226                         if ((Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_VALUE_MASK) && !(PollAddress))
 227                         {
 228                                 Write_Memory_Params.ProgrammingMode = (Write_Memory_Params.ProgrammingMode & ~PROG_MODE_PAGED_VALUE_MASK) |
 229                                                                        PROG_MODE_PAGED_TIMEDELAY_MASK;
 230                         }
 231
 232                         ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
 233                                                                           Write_Memory_Params.DelayMS,
 234                                                                           Write_Memory_Params.ProgrammingCommands[2]);
 235
 236                         /* Check to see if the FLASH address has crossed the extended address boundary */
 237                         if ((V2Command == CMD_PROGRAM_FLASH_ISP) && !(CurrentAddress & 0xFFFF))
 238                           MustLoadExtendedAddress = true;
 239                 }
 240         }
 241         else
 242         {
 243                 /* Word/byte mode memory programming */
 244                 for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
 245                 {
 246                         bool    IsOddByte   = (CurrentByte & 0x01);
 247                         uint8_t ByteToWrite = *(NextWriteByte++);
 248
 249                         /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
 250                         if (MustLoadExtendedAddress)
 251                         {
 252                                 ISPTarget_LoadExtendedAddress();
 253                                 MustLoadExtendedAddress = false;
 254                         }
 255
 256                         ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
 257                         ISPTarget_SendByte(CurrentAddress >> 8);
 258                         ISPTarget_SendByte(CurrentAddress & 0xFF);
 259                         ISPTarget_SendByte(ByteToWrite);
 260
 261                         /* AVR FLASH addressing requires us to modify the write command based on if we are writing a high
 262                          * or low byte at the current word address */
 263                         if (V2Command == CMD_PROGRAM_FLASH_ISP)
 264                           Write_Memory_Params.ProgrammingCommands[0] ^= READ_WRITE_HIGH_BYTE_MASK;
 265
 266                         /* Save previous programming mode in case we modify it for the current word */
 267                         uint8_t PreviousProgrammingMode = Write_Memory_Params.ProgrammingMode;
 268
 269                         if (ByteToWrite != PollValue)
 270                         {
 271                                 if (IsOddByte && (V2Command == CMD_PROGRAM_FLASH_ISP))
 272                                   Write_Memory_Params.ProgrammingCommands[2] |=  READ_WRITE_HIGH_BYTE_MASK;
 273                                 else
 274                                   Write_Memory_Params.ProgrammingCommands[2] &= ~READ_WRITE_HIGH_BYTE_MASK;
 275
 276                                 PollAddress = (CurrentAddress & 0xFFFF);
 277                         }
 278                         else if (!(Write_Memory_Params.ProgrammingMode & PROG_MODE_WORD_READYBUSY_MASK))
 279                         {
 280                                 Write_Memory_Params.ProgrammingMode = (Write_Memory_Params.ProgrammingMode & ~PROG_MODE_WORD_VALUE_MASK) |
 281                                                                        PROG_MODE_WORD_TIMEDELAY_MASK;
 282                         }
 283
 284                         ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
 285                                                                           Write_Memory_Params.DelayMS,
 286                                                                           Write_Memory_Params.ProgrammingCommands[2]);
 287
 288                         /* Restore previous programming mode mask in case the current word needed to change it */
 289                         Write_Memory_Params.ProgrammingMode = PreviousProgrammingMode;
 290
 291                         /* Abort the programming loop early if the byte/word programming failed */
 292                         if (ProgrammingStatus != STATUS_CMD_OK)
 293                           break;
 294
 295                         /* EEPROM just increments the address each byte, flash needs to increment on each word and
 296                          * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
 297                          * address boundary has been crossed */
 298                         if (IsOddByte || (V2Command == CMD_PROGRAM_EEPROM_ISP))
 299                         {
 300                                 CurrentAddress++;
 301
 302                                 if ((V2Command != CMD_PROGRAM_EEPROM_ISP) && !(CurrentAddress & 0xFFFF))
 303                                   MustLoadExtendedAddress = true;
 304                         }
 305                 }
 306         }
 307
 308         Endpoint_Write_Byte(V2Command);
 309         Endpoint_Write_Byte(ProgrammingStatus);
 310         Endpoint_ClearIN();
 311 }
 312
 313 /** Handler for the CMD_READ_FLASH_ISP and CMD_READ_EEPROM_ISP commands, reading in bytes,
 314  *  words or pages of data from the attached device.
 315  *
 316  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 317  */
 318 void ISPProtocol_ReadMemory(uint8_t V2Command)
 319 {
 320         struct
 321         {
 322                 uint16_t BytesToRead;
 323                 uint8_t  ReadMemoryCommand;
 324         } Read_Memory_Params;
 325
 326         Endpoint_Read_Stream_LE(&Read_Memory_Params, sizeof(Read_Memory_Params), NO_STREAM_CALLBACK);
 327         Read_Memory_Params.BytesToRead = SwapEndian_16(Read_Memory_Params.BytesToRead);
 328
 329         Endpoint_ClearOUT();
 330         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 331         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 332
 333         Endpoint_Write_Byte(V2Command);
 334         Endpoint_Write_Byte(STATUS_CMD_OK);
 335
 336         /* Read each byte from the device and write them to the packet for the host */
 337         for (uint16_t CurrentByte = 0; CurrentByte < Read_Memory_Params.BytesToRead; CurrentByte++)
 338         {
 339                 /* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
 340                 if (MustLoadExtendedAddress)
 341                 {
 342                         ISPTarget_LoadExtendedAddress();
 343                         MustLoadExtendedAddress = false;
 344                 }
 345
 346                 /* Read the next byte from the desired memory space in the device */
 347                 ISPTarget_SendByte(Read_Memory_Params.ReadMemoryCommand);
 348                 ISPTarget_SendByte(CurrentAddress >> 8);
 349                 ISPTarget_SendByte(CurrentAddress & 0xFF);
 350                 Endpoint_Write_Byte(ISPTarget_ReceiveByte());
 351
 352                 /* Check if the endpoint bank is currently full, if so send the packet */
 353                 if (!(Endpoint_IsReadWriteAllowed()))
 354                 {
 355                         Endpoint_ClearIN();
 356                         Endpoint_WaitUntilReady();
 357                 }
 358
 359                 /* AVR FLASH addressing requires us to modify the read command based on if we are reading a high
 360                  * or low byte at the current word address */
 361                 if (V2Command == CMD_READ_FLASH_ISP)
 362                   Read_Memory_Params.ReadMemoryCommand ^= READ_WRITE_HIGH_BYTE_MASK;
 363
 364                 /* EEPROM just increments the address each byte, flash needs to increment on each word and
 365                  * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
 366                  * address boundary has been crossed */
 367                 if ((CurrentByte & 0x01) || (V2Command == CMD_READ_EEPROM_ISP))
 368                 {
 369                         CurrentAddress++;
 370
 371                         if ((V2Command != CMD_READ_EEPROM_ISP) && !(CurrentAddress & 0xFFFF))
 372                           MustLoadExtendedAddress = true;
 373                 }
 374         }
 375
 376         Endpoint_Write_Byte(STATUS_CMD_OK);
 377
 378         bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 379         Endpoint_ClearIN();
 380
 381         /* Ensure last packet is a short packet to terminate the transfer */
 382         if (IsEndpointFull)
 383         {
 384                 Endpoint_WaitUntilReady();
 385                 Endpoint_ClearIN();
 386                 Endpoint_WaitUntilReady();
 387         }
 388 }
 389
 390 /** Handler for the CMD_CHI_ERASE_ISP command, clearing the target's FLASH memory. */
 391 void ISPProtocol_ChipErase(void)
 392 {
 393         struct
 394         {
 395                 uint8_t EraseDelayMS;
 396                 uint8_t PollMethod;
 397                 uint8_t EraseCommandBytes[4];
 398         } Erase_Chip_Params;
 399
 400         Endpoint_Read_Stream_LE(&Erase_Chip_Params, sizeof(Erase_Chip_Params), NO_STREAM_CALLBACK);
 401
 402         Endpoint_ClearOUT();
 403         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 404         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 405
 406         uint8_t ResponseStatus = STATUS_CMD_OK;
 407
 408         /* Send the chip erase commands as given by the host to the device */
 409         for (uint8_t SByte = 0; SByte < sizeof(Erase_Chip_Params.EraseCommandBytes); SByte++)
 410           ISPTarget_SendByte(Erase_Chip_Params.EraseCommandBytes[SByte]);
 411
 412         /* Use appropriate command completion check as given by the host (delay or busy polling) */
 413         if (!(Erase_Chip_Params.PollMethod))
 414           ISPProtocol_DelayMS(Erase_Chip_Params.EraseDelayMS);
 415         else
 416           ResponseStatus = ISPTarget_WaitWhileTargetBusy();
 417
 418         Endpoint_Write_Byte(CMD_CHIP_ERASE_ISP);
 419         Endpoint_Write_Byte(ResponseStatus);
 420         Endpoint_ClearIN();
 421 }
 422
 423 /** Handler for the CMD_READ_FUSE_ISP, CMD_READ_LOCK_ISP, CMD_READ_SIGNATURE_ISP and CMD_READ_OSCCAL commands,
 424  *  reading the requested configuration byte from the device.
 425  *
 426  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 427  */
 428 void ISPProtocol_ReadFuseLockSigOSCCAL(uint8_t V2Command)
 429 {
 430         struct
 431         {
 432                 uint8_t RetByte;
 433                 uint8_t ReadCommandBytes[4];
 434         } Read_FuseLockSigOSCCAL_Params;
 435
 436         Endpoint_Read_Stream_LE(&Read_FuseLockSigOSCCAL_Params, sizeof(Read_FuseLockSigOSCCAL_Params), NO_STREAM_CALLBACK);
 437
 438         Endpoint_ClearOUT();
 439         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 440         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 441
 442         uint8_t ResponseBytes[4];
 443
 444         /* Send the Fuse or Lock byte read commands as given by the host to the device, store response */
 445         for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
 446           ResponseBytes[RByte] = ISPTarget_TransferByte(Read_FuseLockSigOSCCAL_Params.ReadCommandBytes[RByte]);
 447
 448         Endpoint_Write_Byte(V2Command);
 449         Endpoint_Write_Byte(STATUS_CMD_OK);
 450         Endpoint_Write_Byte(ResponseBytes[Read_FuseLockSigOSCCAL_Params.RetByte - 1]);
 451         Endpoint_Write_Byte(STATUS_CMD_OK);
 452         Endpoint_ClearIN();
 453 }
 454
 455 /** Handler for the CMD_WRITE_FUSE_ISP and CMD_WRITE_LOCK_ISP commands, writing the requested configuration
 456  *  byte to the device.
 457  *
 458  *  \param[in] V2Command  Issued V2 Protocol command byte from the host
 459  */
 460 void ISPProtocol_WriteFuseLock(uint8_t V2Command)
 461 {
 462         struct
 463         {
 464                 uint8_t WriteCommandBytes[4];
 465         } Write_FuseLockSig_Params;
 466
 467         Endpoint_Read_Stream_LE(&Write_FuseLockSig_Params, sizeof(Write_FuseLockSig_Params), NO_STREAM_CALLBACK);
 468
 469         Endpoint_ClearOUT();
 470         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 471         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 472
 473         /* Send the Fuse or Lock byte program commands as given by the host to the device */
 474         for (uint8_t SByte = 0; SByte < sizeof(Write_FuseLockSig_Params.WriteCommandBytes); SByte++)
 475           ISPTarget_SendByte(Write_FuseLockSig_Params.WriteCommandBytes[SByte]);
 476
 477         Endpoint_Write_Byte(V2Command);
 478         Endpoint_Write_Byte(STATUS_CMD_OK);
 479         Endpoint_Write_Byte(STATUS_CMD_OK);
 480         Endpoint_ClearIN();
 481 }
 482
 483 /** Handler for the CMD_SPI_MULTI command, writing and reading arbitrary SPI data to and from the attached device. */
 484 void ISPProtocol_SPIMulti(void)
 485 {
 486         struct
 487         {
 488                 uint8_t TxBytes;
 489                 uint8_t RxBytes;
 490                 uint8_t RxStartAddr;
 491                 uint8_t TxData[255];
 492         } SPI_Multi_Params;
 493
 494         Endpoint_Read_Stream_LE(&SPI_Multi_Params, (sizeof(SPI_Multi_Params) - sizeof(SPI_Multi_Params.TxData)), NO_STREAM_CALLBACK);
 495         Endpoint_Read_Stream_LE(&SPI_Multi_Params.TxData, SPI_Multi_Params.TxBytes, NO_STREAM_CALLBACK);
 496
 497         Endpoint_ClearOUT();
 498         Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
 499         Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 500
 501         Endpoint_Write_Byte(CMD_SPI_MULTI);
 502         Endpoint_Write_Byte(STATUS_CMD_OK);
 503
 504         uint8_t CurrTxPos = 0;
 505         uint8_t CurrRxPos = 0;
 506
 507         /* Write out bytes to transmit until the start of the bytes to receive is met */
 508         while (CurrTxPos < SPI_Multi_Params.RxStartAddr)
 509         {
 510                 if (CurrTxPos < SPI_Multi_Params.TxBytes)
 511                   ISPTarget_SendByte(SPI_Multi_Params.TxData[CurrTxPos]);
 512                 else
 513                   ISPTarget_SendByte(0);
 514
 515                 CurrTxPos++;
 516         }
 517
 518         /* Transmit remaining bytes with padding as needed, read in response bytes */
 519         while (CurrRxPos < SPI_Multi_Params.RxBytes)
 520         {
 521                 if (CurrTxPos < SPI_Multi_Params.TxBytes)
 522                   Endpoint_Write_Byte(ISPTarget_TransferByte(SPI_Multi_Params.TxData[CurrTxPos++]));
 523                 else
 524                   Endpoint_Write_Byte(ISPTarget_ReceiveByte());
 525
 526                 /* Check to see if we have filled the endpoint bank and need to send the packet */
 527                 if (!(Endpoint_IsReadWriteAllowed()))
 528                 {
 529                         Endpoint_ClearIN();
 530                         Endpoint_WaitUntilReady();
 531                 }
 532
 533                 CurrRxPos++;
 534         }
 535
 536         Endpoint_Write_Byte(STATUS_CMD_OK);
 537
 538         bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 539         Endpoint_ClearIN();
 540
 541         /* Ensure last packet is a short packet to terminate the transfer */
 542         if (IsEndpointFull)
 543         {
 544                 Endpoint_WaitUntilReady();
 545                 Endpoint_ClearIN();
 546                 Endpoint_WaitUntilReady();
 547         }
 548 }
 549
 550 /** Blocking delay for a given number of milliseconds.
 551  *
 552  *  \param[in] DelayMS  Number of milliseconds to delay for
 553  */
 554 void ISPProtocol_DelayMS(uint8_t DelayMS)
 555 {
 556         while (DelayMS-- && TimeoutTicksRemaining)
 557           _delay_ms(1);
 558 }
 559
 560 #endif