firmware/main.c

   1 /* Name: main.c
   2  * Project: USBaspLoader
   3  * Author: Christian Starkjohann
   4  * Creation Date: 2007-12-08
   5  * Tabsize: 4
   6  * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
   7  * License: GNU GPL v2 (see License.txt)
   8  * This Revision: $Id: main.c 786 2010-05-30 20:41:40Z cs $
   9  */
  10
  11 #include <avr/io.h>
  12 #include <avr/interrupt.h>
  13 #include <avr/pgmspace.h>
  14 #include <avr/wdt.h>
  15 #include <avr/boot.h>
  16 #include <avr/eeprom.h>
  17 #include <util/delay.h>
  18
  19 #include <avr/cpufunc.h>
  20
  21 #include <string.h>
  22
  23
  24
  25 static void leaveBootloader() __attribute__((__noreturn__));
  26
  27 #include "bootloaderconfig.h"
  28 #include "usbdrv/usbdrv.c"
  29
  30 #ifndef BOOTLOADER_ADDRESS
  31   #error need to know the bootloaders flash address!
  32 #endif
  33
  34 /* ------------------------------------------------------------------------ */
  35
  36 /* Request constants used by USBasp */
  37 #define USBASP_FUNC_CONNECT         1
  38 #define USBASP_FUNC_DISCONNECT      2
  39 #define USBASP_FUNC_TRANSMIT        3
  40 #define USBASP_FUNC_READFLASH       4
  41 #define USBASP_FUNC_ENABLEPROG      5
  42 #define USBASP_FUNC_WRITEFLASH      6
  43 #define USBASP_FUNC_READEEPROM      7
  44 #define USBASP_FUNC_WRITEEEPROM     8
  45 #define USBASP_FUNC_SETLONGADDRESS  9
  46
  47 /* ------------------------------------------------------------------------ */
  48
  49 #ifndef ulong
  50 #   define ulong    unsigned long
  51 #endif
  52 #ifndef uint
  53 #   define uint     unsigned int
  54 #endif
  55
  56 /* defaults if not in config file: */
  57 #ifndef HAVE_EEPROM_PAGED_ACCESS
  58 #   define HAVE_EEPROM_PAGED_ACCESS 0
  59 #endif
  60 #ifndef HAVE_EEPROM_BYTE_ACCESS
  61 #   define HAVE_EEPROM_BYTE_ACCESS  0
  62 #endif
  63 #ifndef BOOTLOADER_CAN_EXIT
  64 #   define  BOOTLOADER_CAN_EXIT     0
  65 #endif
  66
  67 /* allow compatibility with avrusbboot's bootloaderconfig.h: */
  68 #ifdef BOOTLOADER_INIT
  69 #   define bootLoaderInit()         BOOTLOADER_INIT
  70 #   define bootLoaderExit()
  71 #endif
  72 #ifdef BOOTLOADER_CONDITION
  73 #   define bootLoaderCondition()    BOOTLOADER_CONDITION
  74 #endif
  75
  76 /* device compatibility: */
  77 #ifndef GICR    /* ATMega*8 don't have GICR, use MCUCR instead */
  78 #   define GICR     MCUCR
  79 #endif
  80
  81 /* ------------------------------------------------------------------------ */
  82
  83 #if (FLASHEND) > 0xffff /* we need long addressing */
  84 #   define CURRENT_ADDRESS  currentAddress.l
  85 #   define addr_t           ulong
  86 #else
  87 #   define CURRENT_ADDRESS  currentAddress.w[0]
  88 #   define addr_t           uint
  89 #endif
  90
  91 typedef union longConverter{
  92     addr_t  l;
  93     uint    w[sizeof(addr_t)/2];
  94     uchar   b[sizeof(addr_t)];
  95 }longConverter_t;
  96
  97
  98
  99 #if BOOTLOADER_CAN_EXIT
 100 static uchar                    requestBootLoaderExit;
 101 #endif
 102 static volatile unsigned char   stayinloader = 0xfe;
 103
 104 static longConverter_t          currentAddress; /* in bytes */
 105 static uchar                    bytesRemaining;
 106 static uchar                    isLastPage;
 107 #if HAVE_EEPROM_PAGED_ACCESS
 108 static uchar                    currentRequest;
 109 #else
 110 static const uchar              currentRequest = 0;
 111 #endif
 112
 113 static const uchar  signatureBytes[4] = {
 114 #ifdef SIGNATURE_BYTES
 115     SIGNATURE_BYTES
 116 #elif defined (__AVR_ATmega8__) || defined (__AVR_ATmega8HVA__)
 117     0x1e, 0x93, 0x07, 0
 118 #elif defined (__AVR_ATmega48__) || defined (__AVR_ATmega48P__)
 119     0x1e, 0x92, 0x05, 0
 120 #elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega88P__)
 121     0x1e, 0x93, 0x0a, 0
 122 #elif defined (__AVR_ATmega168__) || defined (__AVR_ATmega168P__)
 123     0x1e, 0x94, 0x06, 0
 124 #elif defined (__AVR_ATmega328P__)
 125     0x1e, 0x95, 0x0f, 0
 126 #else
 127 #   error "Device signature is not known, please edit main.c!"
 128 #endif
 129 };
 130
 131 /* ------------------------------------------------------------------------ */
 132
 133 static void (*nullVector)(void) __attribute__((__noreturn__));
 134
 135 static void leaveBootloader()
 136 {
 137     DBG1(0x01, 0, 0);
 138     cli();
 139     usbDeviceDisconnect();
 140     bootLoaderExit();
 141     USB_INTR_ENABLE = 0;
 142     USB_INTR_CFG = 0;       /* also reset config bits */
 143     GICR = (1 << IVCE);     /* enable change of interrupt vectors */
 144     GICR = (0 << IVSEL);    /* move interrupts to application flash section */
 145 /* We must go through a global function pointer variable instead of writing
 146  *  ((void (*)(void))0)();
 147  * because the compiler optimizes a constant 0 to "rcall 0" which is not
 148  * handled correctly by the assembler.
 149  */
 150     nullVector();
 151 }
 152
 153 /* ------------------------------------------------------------------------ */
 154
 155 uchar   usbFunctionSetup(uchar data[8])
 156 {
 157 usbRequest_t    *rq = (void *)data;
 158 uchar           len = 0;
 159 static uchar    replyBuffer[4];
 160
 161     usbMsgPtr = replyBuffer;
 162     if(rq->bRequest == USBASP_FUNC_TRANSMIT){   /* emulate parts of ISP protocol */
 163         uchar rval = 0;
 164         usbWord_t address;
 165         address.bytes[1] = rq->wValue.bytes[1];
 166         address.bytes[0] = rq->wIndex.bytes[0];
 167         if(rq->wValue.bytes[0] == 0x30){        /* read signature */
 168             rval = rq->wIndex.bytes[0] & 3;
 169             rval = signatureBytes[rval];
 170 #if HAVE_READ_LOCK_FUSE
 171 #if defined (__AVR_ATmega8__)
 172         }else if(rq->wValue.bytes[0] == 0x58 && rq->wValue.bytes[1] == 0x00){  /* read lock bits */
 173             rval = boot_lock_fuse_bits_get(GET_LOCK_BITS);
 174         }else if(rq->wValue.bytes[0] == 0x50 && rq->wValue.bytes[1] == 0x00){  /* read lfuse bits */
 175             rval = boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS);
 176         }else if(rq->wValue.bytes[0] == 0x58 && rq->wValue.bytes[1] == 0x08){  /* read hfuse bits */
 177             rval = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
 178 #endif
 179 #endif
 180 #if HAVE_EEPROM_BYTE_ACCESS
 181         }else if(rq->wValue.bytes[0] == 0xa0){  /* read EEPROM byte */
 182             rval = eeprom_read_byte((void *)address.word);
 183         }else if(rq->wValue.bytes[0] == 0xc0){  /* write EEPROM byte */
 184             eeprom_write_byte((void *)address.word, rq->wIndex.bytes[1]);
 185 #endif
 186 #if HAVE_CHIP_ERASE
 187         }else if(rq->wValue.bytes[0] == 0xac && rq->wValue.bytes[1] == 0x80){  /* chip erase */
 188             addr_t addr;
 189             for(addr = 0; addr < FLASHEND + 1 - 2048; addr += SPM_PAGESIZE) {
 190                 /* wait and erase page */
 191                 DBG1(0x33, 0, 0);
 192 #   ifndef NO_FLASH_WRITE
 193                 boot_spm_busy_wait();
 194                 cli();
 195                 boot_page_erase(addr);
 196                 sei();
 197 #   endif
 198             }
 199 #endif
 200         }else{
 201             /* ignore all others, return default value == 0 */
 202         }
 203         replyBuffer[3] = rval;
 204         len = 4;
 205     }else if(rq->bRequest == USBASP_FUNC_ENABLEPROG){
 206         /* replyBuffer[0] = 0; is never touched and thus always 0 which means success */
 207         len = 1;
 208     }else if(rq->bRequest >= USBASP_FUNC_READFLASH && rq->bRequest <= USBASP_FUNC_SETLONGADDRESS){
 209         currentAddress.w[0] = rq->wValue.word;
 210         if(rq->bRequest == USBASP_FUNC_SETLONGADDRESS){
 211 #if (FLASHEND) > 0xffff
 212             currentAddress.w[1] = rq->wIndex.word;
 213 #endif
 214         }else{
 215             bytesRemaining = rq->wLength.bytes[0];
 216             /* if(rq->bRequest == USBASP_FUNC_WRITEFLASH) only evaluated during writeFlash anyway */
 217             isLastPage = rq->wIndex.bytes[1] & 0x02;
 218 #if HAVE_EEPROM_PAGED_ACCESS
 219             currentRequest = rq->bRequest;
 220 #endif
 221             len = 0xff; /* hand over to usbFunctionRead() / usbFunctionWrite() */
 222         }
 223
 224     }else if(rq->bRequest == USBASP_FUNC_DISCONNECT){
 225       stayinloader         &= (0xfe);
 226 #if BOOTLOADER_CAN_EXIT
 227       requestBootLoaderExit = 1;      /* allow proper shutdown/close of connection */
 228 #endif
 229     }else{
 230         /* ignore: others, but could be USBASP_FUNC_CONNECT */
 231         stayinloader       |= (0x01);
 232     }
 233     return len;
 234 }
 235
 236 uchar usbFunctionWrite(uchar *data, uchar len)
 237 {
 238 uchar   isLast;
 239
 240     DBG1(0x31, (void *)&currentAddress.l, 4);
 241     if(len > bytesRemaining)
 242         len = bytesRemaining;
 243     bytesRemaining -= len;
 244     isLast = bytesRemaining == 0;
 245     if(currentRequest >= USBASP_FUNC_READEEPROM){
 246         uchar i;
 247         for(i = 0; i < len; i++){
 248             eeprom_write_byte((void *)(currentAddress.w[0]++), *data++);
 249         }
 250     }else{
 251         uchar i;
 252         for(i = 0; i < len;){
 253 #if HAVE_BLB11_SOFTW_LOCKBIT
 254             uint8_t allowWrite = (CURRENT_ADDRESS < (addr_t)(BOOTLOADER_ADDRESS));
 255 #if HAVE_BLB11_SOFTW_BACKDOOR
 256             if ((stayinloader >= 0x10) && (bootLoaderCondition())) allowWrite=1;
 257 #endif
 258 #endif
 259 #if !HAVE_CHIP_ERASE
 260             if((currentAddress.w[0] & (SPM_PAGESIZE - 1)) == 0){    /* if page start: erase */
 261                 DBG1(0x33, 0, 0);
 262 #   ifndef NO_FLASH_WRITE
 263 #       if HAVE_BLB11_SOFTW_LOCKBIT
 264                 if (allowWrite) {
 265 #       endif
 266                 cli();
 267                 boot_page_erase(CURRENT_ADDRESS);   /* erase page */
 268                 sei();
 269                 boot_spm_busy_wait();               /* wait until page is erased */
 270 #       if HAVE_BLB11_SOFTW_LOCKBIT
 271                 }
 272 #       endif
 273 #   endif
 274             }
 275 #endif
 276             i += 2;
 277             DBG1(0x32, 0, 0);
 278 #       if HAVE_BLB11_SOFTW_LOCKBIT
 279             if (allowWrite) {
 280 #       endif
 281             cli();
 282             boot_page_fill(CURRENT_ADDRESS, *(short *)data);
 283             sei();
 284 #       if HAVE_BLB11_SOFTW_LOCKBIT
 285             }
 286 #       endif
 287             CURRENT_ADDRESS += 2;
 288             data += 2;
 289             /* write page when we cross page boundary or we have the last partial page */
 290             if((currentAddress.w[0] & (SPM_PAGESIZE - 1)) == 0 || (isLast && i >= len && isLastPage)){
 291                 DBG1(0x34, 0, 0);
 292 #ifndef NO_FLASH_WRITE
 293 #       if HAVE_BLB11_SOFTW_LOCKBIT
 294                 if (allowWrite) {
 295 #       endif
 296                 cli();
 297                 boot_page_write(CURRENT_ADDRESS - 2);
 298                 sei();
 299                 boot_spm_busy_wait();
 300                 cli();
 301                 boot_rww_enable();
 302                 sei();
 303 #       if HAVE_BLB11_SOFTW_LOCKBIT
 304                 }
 305 #       endif
 306 #endif
 307             }
 308         }
 309         DBG1(0x35, (void *)&currentAddress.l, 4);
 310     }
 311     return isLast;
 312 }
 313
 314 uchar usbFunctionRead(uchar *data, uchar len)
 315 {
 316 uchar   i;
 317
 318     if(len > bytesRemaining)
 319         len = bytesRemaining;
 320     bytesRemaining -= len;
 321     for(i = 0; i < len; i++){
 322         if(currentRequest >= USBASP_FUNC_READEEPROM){
 323             *data = eeprom_read_byte((void *)currentAddress.w[0]);
 324         }else{
 325             *data = pgm_read_byte((void *)CURRENT_ADDRESS);
 326         }
 327         data++;
 328         CURRENT_ADDRESS++;
 329     }
 330     return len;
 331 }
 332
 333 /* ------------------------------------------------------------------------ */
 334
 335 static void initForUsbConnectivity(void)
 336 {
 337 uchar   i = 0;
 338
 339     usbInit();
 340     /* enforce USB re-enumerate: */
 341     usbDeviceDisconnect();  /* do this while interrupts are disabled */
 342     while(--i){         /* fake USB disconnect for > 250 ms */
 343         _delay_ms(1);
 344     }
 345     usbDeviceConnect();
 346     sei();
 347 }
 348
 349 int __attribute__((noreturn)) main(void)
 350 {
 351     /* initialize  */
 352     wdt_disable();      /* main app may have enabled watchdog */
 353     bootLoaderInit();
 354     odDebugInit();
 355     DBG1(0x00, 0, 0);
 356 #ifndef NO_FLASH_WRITE
 357     GICR = (1 << IVCE);  /* enable change of interrupt vectors */
 358     GICR = (1 << IVSEL); /* move interrupts to boot flash section */
 359 #endif
 360     if(bootLoaderCondition()){
 361 #if BOOTLOADER_CAN_EXIT
 362         uchar i = 0, j = 0;
 363 #endif
 364         initForUsbConnectivity();
 365         do{
 366             usbPoll();
 367 #if BOOTLOADER_CAN_EXIT
 368             if(requestBootLoaderExit){
 369                 if(--i == 0){
 370                     if(--j == 0)
 371                         break;
 372                 }
 373             }
 374 #endif
 375         if (stayinloader >= 0x10) {
 376           if (!bootLoaderCondition()) {
 377             stayinloader-=0x10;
 378           }
 379         } else {
 380           if (bootLoaderCondition()) {
 381             if (stayinloader > 1) stayinloader-=2;
 382           }
 383         }
 384
 385         }while (stayinloader);  /* main event loop */
 386     }
 387     leaveBootloader();
 388 }
 389
 390 /* ------------------------------------------------------------------------ */