Bootloaders/CDC/BootloaderCDC.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   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  *  Main source file for the CDC class bootloader. This file contains the complete bootloader logic.
  34  */
  35
  36 #define  INCLUDE_FROM_BOOTLOADERCDC_C
  37 #include "BootloaderCDC.h"
  38
  39 /* Globals: */
  40 /** Line coding options for the virtual serial port. Although the virtual serial port data is never
  41  *  sent through a physical serial port, the line encoding data must still be read and preserved from
  42  *  the host, or the host will detect a problem and fail to open the port. This structure contains the
  43  *  current encoding options, including baud rate, character format, parity mode and total number of
  44  *  bits in each data chunk.
  45  */
  46 CDC_Line_Coding_t LineCoding = { .BaudRateBPS = 9600,
  47                                  .CharFormat  = OneStopBit,
  48                                  .ParityType  = Parity_None,
  49                                  .DataBits    = 8            };
  50
  51 /** Current address counter. This stores the current address of the FLASH or EEPROM as set by the host,
  52  *  and is used when reading or writing to the AVRs memory (either FLASH or EEPROM depending on the issued
  53  *  command.)
  54  */
  55 uint32_t CurrAddress;
  56
  57 /** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run
  58  *  via a soft reset. When cleared, the bootloader will abort, the USB interface will shut down and the application
  59  *  jumped to via an indirect jump to location 0x0000.
  60  */
  61 bool RunBootloader = true;
  62
  63
  64 /** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
  65  *  runs the bootloader processing routine until instructed to soft-exit, or hard-reset via the watchdog to start
  66  *  the loaded application code.
  67  */
  68 int main(void)
  69 {
  70         /* Disable watchdog if enabled by bootloader/fuses */
  71         MCUSR &= ~(1 << WDRF);
  72         wdt_disable();
  73
  74         /* Disable clock division */
  75         clock_prescale_set(clock_div_1);
  76
  77         /* Relocate the interrupt vector table to the bootloader section */
  78         MCUCR = (1 << IVCE);
  79         MCUCR = (1 << IVSEL);
  80
  81         /* Initialize USB Subsystem */
  82         USB_Init();
  83
  84         while (RunBootloader)
  85         {
  86                 USB_USBTask();
  87                 CDC_Task();
  88         }
  89
  90         Endpoint_SelectEndpoint(CDC_TX_EPNUM);
  91
  92         /* Wait until any pending transmissions have completed before shutting down */
  93         while (!(Endpoint_IsINReady()));
  94
  95         /* Shut down the USB subsystem */
  96         USB_ShutDown();
  97
  98         /* Relocate the interrupt vector table back to the application section */
  99         MCUCR = (1 << IVCE);
 100         MCUCR = 0;
 101
 102         /* Reset any used hardware ports back to their defaults */
 103         PORTD = 0;
 104         DDRD  = 0;
 105
 106         #if defined(PORTE)
 107         PORTE = 0;
 108         DDRE  = 0;
 109         #endif
 110
 111         /* Re-enable RWW section */
 112         boot_rww_enable();
 113
 114         /* Start the user application */
 115         AppPtr_t AppStartPtr = (AppPtr_t)0x0000;
 116         AppStartPtr();
 117 }
 118
 119 /** Event handler for the USB_Disconnect event. This indicates that the bootloader should exit and the user
 120  *  application started.
 121  */
 122 EVENT_HANDLER(USB_Disconnect)
 123 {
 124         /* Upon disconnection, run user application */
 125         RunBootloader = false;
 126 }
 127
 128 /** Event handler for the USB_ConfigurationChanged event. This configures the device's endpoints ready
 129  *  to relay data to and from the attached USB host.
 130  */
 131 EVENT_HANDLER(USB_ConfigurationChanged)
 132 {
 133         /* Setup CDC Notification, Rx and Tx Endpoints */
 134         Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
 135                                        ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
 136                                    ENDPOINT_BANK_SINGLE);
 137
 138         Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
 139                                        ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
 140                                    ENDPOINT_BANK_SINGLE);
 141
 142         Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
 143                                        ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
 144                                    ENDPOINT_BANK_SINGLE);
 145 }
 146
 147 /** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
 148  *  control requests that are not handled internally by the USB library, so that they can be handled appropriately
 149  *  for the application.
 150  */
 151 EVENT_HANDLER(USB_UnhandledControlPacket)
 152 {
 153         uint8_t* LineCodingData = (uint8_t*)&LineCoding;
 154
 155         /* Process CDC specific control requests */
 156         switch (USB_ControlRequest.bRequest)
 157         {
 158                 case REQ_GetLineEncoding:
 159                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 160                         {
 161                                 Endpoint_ClearSETUP();
 162
 163                                 for (uint8_t i = 0; i < sizeof(LineCoding); i++)
 164                                   Endpoint_Write_Byte(*(LineCodingData++));
 165
 166                                 Endpoint_ClearIN();
 167
 168                                 /* Acknowledge status stage */
 169                                 while (!(Endpoint_IsOUTReceived()));
 170                                 Endpoint_ClearOUT();
 171                         }
 172
 173                         break;
 174                 case REQ_SetLineEncoding:
 175                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 176                         {
 177                                 Endpoint_ClearSETUP();
 178
 179                                 while (!(Endpoint_IsOUTReceived()));
 180
 181                                 for (uint8_t i = 0; i < sizeof(LineCoding); i++)
 182                                   *(LineCodingData++) = Endpoint_Read_Byte();
 183
 184                                 Endpoint_ClearOUT();
 185
 186                                 /* Acknowledge status stage */
 187                                 while (!(Endpoint_IsINReady()));
 188                                 Endpoint_ClearIN();
 189                         }
 190
 191                         break;
 192                 case REQ_SetControlLineState:
 193                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 194                         {
 195                                 Endpoint_ClearSETUP();
 196
 197                                 /* Acknowledge status stage */
 198                                 while (!(Endpoint_IsINReady()));
 199                                 Endpoint_ClearIN();
 200                         }
 201
 202                         break;
 203         }
 204 }
 205
 206 /** Reads or writes a block of EEPROM or FLASH memory to or from the appropriate CDC data endpoint, depending
 207  *  on the AVR910 protocol command issued.
 208  *
 209  *  \param Command  Single character AVR910 protocol command indicating what memory operation to perform
 210  */
 211 static void ReadWriteMemoryBlock(const uint8_t Command)
 212 {
 213         uint16_t BlockSize;
 214         char     MemoryType;
 215
 216         bool     HighByte = false;
 217         uint8_t  LowByte  = 0;
 218
 219         BlockSize  = (FetchNextCommandByte() << 8);
 220         BlockSize |=  FetchNextCommandByte();
 221
 222         MemoryType =  FetchNextCommandByte();
 223
 224         if ((MemoryType != 'E') && (MemoryType != 'F'))
 225         {
 226                 /* Send error byte back to the host */
 227                 WriteNextResponseByte('?');
 228
 229                 return;
 230         }
 231
 232         /* Check if command is to read memory */
 233         if (Command == 'g')
 234         {
 235                 /* Re-enable RWW section */
 236                 boot_rww_enable();
 237
 238                 while (BlockSize--)
 239                 {
 240                         if (MemoryType == 'E')
 241                         {
 242                                 /* Read the next EEPROM byte into the endpoint */
 243                                 WriteNextResponseByte(eeprom_read_byte((uint8_t*)(uint16_t)(CurrAddress >> 1)));
 244
 245                                 /* Increment the address counter after use */
 246                                 CurrAddress += 2;
 247                         }
 248                         else
 249                         {
 250                                 /* Read the next FLASH byte from the current FLASH page */
 251                                 #if defined(RAMPZ)
 252                                 WriteNextResponseByte(pgm_read_byte_far(CurrAddress | HighByte));
 253                                 #else
 254                                 WriteNextResponseByte(pgm_read_byte(CurrAddress | HighByte));
 255                                 #endif
 256
 257                                 /* If both bytes in current word have been read, increment the address counter */
 258                                 if (HighByte)
 259                                   CurrAddress += 2;
 260
 261                                 HighByte = !HighByte;
 262                         }
 263                 }
 264         }
 265         else
 266         {
 267                 uint32_t PageStartAddress = CurrAddress;
 268
 269                 if (MemoryType == 'F')
 270                 {
 271                         boot_page_erase(PageStartAddress);
 272                         boot_spm_busy_wait();
 273                 }
 274
 275                 while (BlockSize--)
 276                 {
 277                         if (MemoryType == 'F')
 278                         {
 279                                 /* If both bytes in current word have been written, increment the address counter */
 280                                 if (HighByte)
 281                                 {
 282                                         /* Write the next FLASH word to the current FLASH page */
 283                                         boot_page_fill(CurrAddress, ((FetchNextCommandByte() << 8) | LowByte));
 284
 285                                         /* Increment the address counter after use */
 286                                         CurrAddress += 2;
 287
 288                                         HighByte = false;
 289                                 }
 290                                 else
 291                                 {
 292                                         LowByte = FetchNextCommandByte();
 293
 294                                         HighByte = true;
 295                                 }
 296                         }
 297                         else
 298                         {
 299                                 /* Write the next EEPROM byte from the endpoint */
 300                                 eeprom_write_byte((uint8_t*)(uint16_t)(CurrAddress >> 1), FetchNextCommandByte());
 301
 302                                 /* Increment the address counter after use */
 303                                 CurrAddress += 2;
 304                         }
 305                 }
 306
 307                 /* If in FLASH programming mode, commit the page after writing */
 308                 if (MemoryType == 'F')
 309                 {
 310                         /* Commit the flash page to memory */
 311                         boot_page_write(PageStartAddress);
 312
 313                         /* Wait until write operation has completed */
 314                         boot_spm_busy_wait();
 315                 }
 316
 317                 /* Send response byte back to the host */
 318                 WriteNextResponseByte('\r');
 319         }
 320 }
 321
 322 /** Retrieves the next byte from the host in the CDC data OUT endpoint, and clears the endpoint bank if needed
 323  *  to allow reception of the next data packet from the host.
 324  *
 325  *  \return Next received byte from the host in the CDC data OUT endpoint
 326  */
 327 static uint8_t FetchNextCommandByte(void)
 328 {
 329         /* Select the OUT endpoint so that the next data byte can be read */
 330         Endpoint_SelectEndpoint(CDC_RX_EPNUM);
 331
 332         /* If OUT endpoint empty, clear it and wait for the next packet from the host */
 333         while (!(Endpoint_IsReadWriteAllowed()))
 334         {
 335                 Endpoint_ClearOUT();
 336                 while (!(Endpoint_IsOUTReceived()));
 337         }
 338
 339         /* Fetch the next byte from the OUT endpoint */
 340         return Endpoint_Read_Byte();
 341 }
 342
 343 /** Writes the next response byte to the CDC data IN endpoint, and sends the endpoint back if needed to free up the
 344  *  bank when full ready for the next byte in the packet to the host.
 345  *
 346  *  \param Response  Next response byte to send to the host
 347  */
 348 static void WriteNextResponseByte(const uint8_t Response)
 349 {
 350         /* Select the IN endpoint so that the next data byte can be written */
 351         Endpoint_SelectEndpoint(CDC_TX_EPNUM);
 352
 353         /* If IN endpoint full, clear it and wait util ready for the next packet to the host */
 354         if (!(Endpoint_IsReadWriteAllowed()))
 355         {
 356                 Endpoint_ClearIN();
 357                 while (!(Endpoint_IsINReady()));
 358         }
 359
 360         /* Write the next byte to the OUT endpoint */
 361         Endpoint_Write_Byte(Response);
 362 }
 363
 364 /** Task to read in AVR910 commands from the CDC data OUT endpoint, process them, perform the required actions
 365  *  and send the appropriate response back to the host.
 366  */
 367 TASK(CDC_Task)
 368 {
 369         /* Select the OUT endpoint */
 370         Endpoint_SelectEndpoint(CDC_RX_EPNUM);
 371
 372         /* Check if endpoint has a command in it sent from the host */
 373         if (Endpoint_IsOUTReceived())
 374         {
 375                 /* Read in the bootloader command (first byte sent from host) */
 376                 uint8_t Command = FetchNextCommandByte();
 377
 378                 if ((Command == 'L') || (Command == 'P') || (Command == 'T') || (Command == 'E'))
 379                 {
 380                         if (Command == 'E')
 381                           RunBootloader = false;
 382                         if (Command == 'T')
 383                           FetchNextCommandByte();
 384
 385                         /* Send confirmation byte back to the host */
 386                         WriteNextResponseByte('\r');
 387                 }
 388                 else if (Command == 't')
 389                 {
 390                         /* Return ATMEGA128 part code - this is only to allow AVRProg to use the bootloader */
 391                         WriteNextResponseByte(0x44);
 392
 393                         WriteNextResponseByte(0x00);
 394                 }
 395                 else if (Command == 'a')
 396                 {
 397                         /* Indicate auto-address increment is supported */
 398                         WriteNextResponseByte('Y');
 399                 }
 400                 else if (Command == 'A')
 401                 {
 402                         /* Set the current address to that given by the host */
 403                         CurrAddress   = (FetchNextCommandByte() << 9);
 404                         CurrAddress  |= (FetchNextCommandByte() << 1);
 405
 406                         /* Send confirmation byte back to the host */
 407                         WriteNextResponseByte('\r');
 408                 }
 409                 else if (Command == 'p')
 410                 {
 411                         /* Indicate serial programmer back to the host */
 412                         WriteNextResponseByte('S');
 413                 }
 414                 else if (Command == 'S')
 415                 {
 416                         /* Write the 7-byte software identifier to the endpoint */
 417                         for (uint8_t CurrByte = 0; CurrByte < 7; CurrByte++)
 418                           WriteNextResponseByte(SOFTWARE_IDENTIFIER[CurrByte]);
 419                 }
 420                 else if (Command == 'V')
 421                 {
 422                         WriteNextResponseByte('0' + BOOTLOADER_VERSION_MAJOR);
 423                         WriteNextResponseByte('0' + BOOTLOADER_VERSION_MINOR);
 424                 }
 425                 else if (Command == 's')
 426                 {
 427                         WriteNextResponseByte(SIGNATURE_2);
 428                         WriteNextResponseByte(SIGNATURE_1);
 429                         WriteNextResponseByte(SIGNATURE_0);
 430                 }
 431                 else if (Command == 'b')
 432                 {
 433                         WriteNextResponseByte('Y');
 434
 435                         /* Send block size to the host */
 436                         WriteNextResponseByte(SPM_PAGESIZE >> 8);
 437                         WriteNextResponseByte(SPM_PAGESIZE & 0xFF);
 438                 }
 439                 else if (Command == 'e')
 440                 {
 441                         /* Clear the application section of flash */
 442                         for (uint32_t CurrFlashAddress = 0; CurrFlashAddress < BOOT_START_ADDR; CurrFlashAddress++)
 443                         {
 444                                 boot_page_erase(CurrFlashAddress);
 445                                 boot_spm_busy_wait();
 446                                 boot_page_write(CurrFlashAddress);
 447                                 boot_spm_busy_wait();
 448
 449                                 CurrFlashAddress += SPM_PAGESIZE;
 450                         }
 451
 452                         /* Send confirmation byte back to the host */
 453                         WriteNextResponseByte('\r');
 454                 }
 455                 else if (Command == 'l')
 456                 {
 457                         /* Set the lock bits to those given by the host */
 458                         boot_lock_bits_set(FetchNextCommandByte());
 459
 460                         /* Send confirmation byte back to the host */
 461                         WriteNextResponseByte('\r');
 462                 }
 463                 else if (Command == 'r')
 464                 {
 465                         WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOCK_BITS));
 466                 }
 467                 else if (Command == 'F')
 468                 {
 469                         WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS));
 470                 }
 471                 else if (Command == 'N')
 472                 {
 473                         WriteNextResponseByte(boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS));
 474                 }
 475                 else if (Command == 'Q')
 476                 {
 477                         WriteNextResponseByte(boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS));
 478                 }
 479                 else if (Command == 'C')
 480                 {
 481                         /* Write the high byte to the current flash page */
 482                         boot_page_fill(CurrAddress, FetchNextCommandByte());
 483
 484                         /* Send confirmation byte back to the host */
 485                         WriteNextResponseByte('\r');
 486                 }
 487                 else if (Command == 'c')
 488                 {
 489                         /* Write the low byte to the current flash page */
 490                         boot_page_fill(CurrAddress | 1, FetchNextCommandByte());
 491
 492                         /* Increment the address */
 493                         CurrAddress += 2;
 494
 495                         /* Send confirmation byte back to the host */
 496                         WriteNextResponseByte('\r');
 497                 }
 498                 else if (Command == 'm')
 499                 {
 500                         /* Commit the flash page to memory */
 501                         boot_page_write(CurrAddress);
 502
 503                         /* Wait until write operation has completed */
 504                         boot_spm_busy_wait();
 505
 506                         /* Send confirmation byte back to the host */
 507                         WriteNextResponseByte('\r');
 508                 }
 509                 else if ((Command == 'B') || (Command == 'g'))
 510                 {
 511                         /* Delegate the block write/read to a separate function for clarity */
 512                         ReadWriteMemoryBlock(Command);
 513                 }
 514                 else if (Command == 'R')
 515                 {
 516                         #if defined(RAMPZ)
 517                         uint16_t ProgramWord = pgm_read_word_far(CurrAddress);
 518                         #else
 519                         uint16_t ProgramWord = pgm_read_word(CurrAddress);
 520                         #endif
 521
 522                         WriteNextResponseByte(ProgramWord >> 8);
 523                         WriteNextResponseByte(ProgramWord & 0xFF);
 524                 }
 525                 else if (Command == 'D')
 526                 {
 527                         /* Read the byte from the endpoint and write it to the EEPROM */
 528                         eeprom_write_byte((uint8_t*)(uint16_t)(CurrAddress >> 1), FetchNextCommandByte());
 529
 530                         /* Increment the address after use */
 531                         CurrAddress += 2;
 532
 533                         /* Send confirmation byte back to the host */
 534                         WriteNextResponseByte('\r');
 535                 }
 536                 else if (Command == 'd')
 537                 {
 538                         /* Read the EEPROM byte and write it to the endpoint */
 539                         WriteNextResponseByte(eeprom_read_byte((uint8_t*)(uint16_t)(CurrAddress >> 1)));
 540
 541                         /* Increment the address after use */
 542                         CurrAddress += 2;
 543                 }
 544                 else if (Command == 27)
 545                 {
 546                         /* Escape is sync, ignore */
 547                 }
 548                 else
 549                 {
 550                         /* Unknown command, return fail code */
 551                         WriteNextResponseByte('?');
 552                 }
 553
 554                 /* Select the IN endpoint */
 555                 Endpoint_SelectEndpoint(CDC_TX_EPNUM);
 556
 557                 /* Remember if the endpoint is completely full before clearing it */
 558                 bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
 559
 560                 /* Send the endpoint data to the host */
 561                 Endpoint_ClearIN();
 562
 563                 /* If a full endpoint's worth of data was sent, we need to send an empty packet afterwards to signal end of transfer */
 564                 if (IsEndpointFull)
 565                 {
 566                         while (!(Endpoint_IsINReady()));
 567                         Endpoint_ClearIN();
 568                 }
 569
 570                 /* Select the OUT endpoint */
 571                 Endpoint_SelectEndpoint(CDC_RX_EPNUM);
 572
 573                 /* Acknowledge the command from the host */
 574                 Endpoint_ClearOUT();
 575         }
 576 }