📄 libdrive.lst
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444 2 // buffer = buffer;
445 2 return FS_SCAN_FAIL;
446 2 // drv->FatRead = NULL;
447 2 // drv->FatWrite = NULL;
448 2 }
449 1 else if(!memcomp(buffer + 0x36, "FAT16", 5))
450 1 {
451 2 // buffer = buffer;
452 2 drv->Flag.Fat32 = 0;
453 2 // drv->FatRead = ReadFat16;
454 2 // drv->FatWrite = WriteFat16;
455 2 }
456 1 else if(!memcomp(buffer + 0x52, "FAT32", 5))
457 1 {
458 2 // buffer = buffer;
459 2 drv->Flag.Fat32 = 1;
460 2 // drv->FatRead = ReadFat32;
461 2 // drv->FatWrite = WriteFat32;
462 2 }
463 1 else
464 1 {
465 2 //OsTempMemRelease((DWORD)buffer);
466 2 return FS_SCAN_FAIL;
467 2 }
468 1
469 1 //OsTempMemRelease((DWORD)buffer);
470 1 if(BootRecordRead(drv, 0) != FS_SUCCEED) // parsing the partition boot sector
471 1 return DRIVE_ACCESS_FAIL;
C51 COMPILER V8.01 LIBDRIVE 04/17/2008 09:46:00 PAGE 9
472 1
473 1 //DriveCounter ++; // increase to next drive
474 1
475 1 // drv->Partition = 0;
476 1 drv->Flag.Present = 1;
477 1
478 1 return FS_SUCCEED;
479 1 }
480 #endif
481
482 // scan the partition table of the device.
483 // note that only HD support multiple partition
484 // and the maximum number is MAX_PARTITION_NUM
485 static BYTE PartitionScan(DRIVE *drv)
486 {
487 1 #if 0
PARTITION *par;
BYTE * buffer;//DWORD buffer;
//BYTE dev;
UDWORD work_lba, base_lba, temp_lba;
BYTE flag;//SDWORD flag;
//UDWORD parCounter;
work_lba = 0;
base_lba = 0;
//parCounter = 0; // use to count the partition in a device
//dev = drv->DevID;
buffer = DBUF;
//Get the MBR, MBR_LBA=0，获取存储设备的主引导记录
if(DriveRead(drv, (BYTE *)buffer, work_lba, 0) != FS_SUCCEED){
return 0;
}
//判断MBR的结束标志0x55aa是否正确。
if(*(WORD *)(buffer + 0x1fe) != 0x55aa){
return 0;
}
//PARTITION Table的起始地址
par = (PARTITION *)(buffer + PARTITION_OFFSET);
//while(1) {
flag = 1; // preset to supported flag type
//确定分区类型，确定相应的读写函数
switch(par->Type){
#if 0
case 1: // FAT12 type
//drv->FatRead = NULL;
//drv->FatWrite = NULL;
drv->Flag.Fat32 = 0;
UartOutText("FAT12 \r\n");
break;
#endif
case 4: case 6: case 14: // FAT16 type
//drv->FatRead = ReadFat16;
//drv->FatWrite = WriteFat16;
drv->Flag.Fat32 = 0;
UartOutText("FAT16 \r\n");
break;
case 11: case 12: // FAT32 type
//drv->FatRead = ReadFat32;
C51 COMPILER V8.01 LIBDRIVE 04/17/2008 09:46:00 PAGE 10
//drv->FatWrite = WriteFat32;
drv->Flag.Fat32 = 1;
UartOutText("FAT32 \r\n");
break;
#if 0
//扩展分区
case 5: case 15: // DOS extended type
UartOutText("DOS extended type \r\n");
//// IF the extended partition need to be last ?
work_lba = base_lba + LoadAlien32(&par->Start);
// if base_lba zero mean this extended partition is the first
// extended partition, then it would be the base partition of
// the following extended partitions
if(!base_lba) base_lba = work_lba;
DriveRead(drv, (BYTE *)buffer, work_lba);
// if not formated sector, then ending the scanning
if(*((WORD *)(buffer + 0x1fe)) != 0x55aa){
return parCounter;
}
// reset the partition table point
par = (PARTITION *)(buffer + PARTITION_OFFSET - 0x10);
flag = 0;
break;
#endif
default: // not support type
flag = 0;
}
if(flag){
#if 0
drv->wMp3Idx = 0;
if((par->res1==MP3_IDX_FLAG1)&&(par->res2==MP3_IDX_FLAG2)){
drv->wMp3Idx = (par->res3<<8)|(par->res4);
}
#endif
// parsing the partition boot sector，解析分区的起始扇区。
//读取分析系统引导记录DBR，DBR_LBA=MBR.PT[0].RelativeSectors
LoadAlien32(&par->Start, &temp_lba);
temp_lba += work_lba;// + LoadAlien32(&par->Start);
if(BootRecordRead(drv, temp_lba) != FS_SUCCEED){
return 0;//return parCounter;
}
// set and increase the partition counter
//drv->Partition = parCounter;
//parCounter ++;
// increase to next drive
//drv->Flag.Present = 1;
//DriveCounter ++;
//drv ++;
// copy the device point from next drive
//if(!drv->Flag.Present) drv->DevID = dev;
//if(parCounter >= MAX_PARTITION_NUM) return parCounter;
}
C51 COMPILER V8.01 LIBDRIVE 04/17/2008 09:46:00 PAGE 11
// only HD support multiple partition
return 1;//return parCounter;
//}
#else
600 1 PARTITION * data par;
601 1 BYTE * data buffer;//DWORD buffer;
602 1 UDWORD temp_lba;
603 1
604 1 buffer = DBUF;
605 1
606 1 UartOutText("\rPartitionScan(), before DriveRead()\r\n\r\n\r\n");
607 1
608 1 //Get the MBR, MBR_LBA=0，获取存储设备的主引导记录
609 1 DriveRead((BYTE *)buffer, 0, 0);
610 1 //UartOutText1((BYTE *)buffer, 512);
611 1
612 1 //判断MBR的结束标志0x55aa是否正确。
613 1 if(*(WORD *)(buffer + 0x1fe) != 0x55aa){
614 2 return 0;
615 2 }
616 1
617 1 //PARTITION Table的起始地址
618 1 par = (PARTITION *)(buffer + PARTITION_OFFSET);
619 1
620 1 #if 0
{
BYTE i;
for(i=0; i<4; i++){
UartOutText("\r\nPartition Info: \r\n");
UartOutText("-I-: par->Active 0x"); UartOutValue(par->Active, 2);
UartOutText("-I-: par->Size 0x"); UartOutValue(par->Size, 8);
UartOutText("-I-: par->Start 0x"); UartOutValue(par->Start, 8);
UartOutText("-I-: par->Type 0x"); UartOutValue(par->Type, 2);
par += sizeof(PARTITION);
}
par = (PARTITION *)(buffer + PARTITION_OFFSET);
}
#endif
638 1
639 1 //确定分区类型，确定相应的读写函数
640 1 switch(par->Type){
641 2 case 4: case 6: case 14: // FAT16 type
642 2 drv->Flag.Fat32 = 0;
643 2 //LoadAlien32(&par->Start, &temp_lba);
644 2 UartOutText("FAT16 \r\n");
645 2 break;
646 2
647 2 case 11: case 12://case 1: // FAT32 type
648 2 drv->Flag.Fat32 = 1;
649 2 UartOutText("FAT32 \r\n");
650 2 //LoadAlien32(&par->Start, &temp_lba);
651 2 break;
652 2
653 2 default: // not support type
654 2 UartOutText("part type"); UartOutValue(par->Type, 2);
655 2 //drv->Flag.Fat32 = 1;
656 2 //temp_lba = 0x00;
657 2 //break;
C51 COMPILER V8.01 LIBDRIVE 04/17/2008 09:46:00 PAGE 12
658 2 return 0;
659 2 }
660 1
661 1 // parsing the partition boot sector，解析分区的起始扇区。
662 1 //读取分析系统引导记录DBR，DBR_LBA=MBR.PT[0].RelativeSectors
663 1
664 1 LoadAlien32(&par->Start, &temp_lba);
665 1 if(BootRecordRead(drv, temp_lba) != FS_SUCCEED){
666 2 return 0;//return parCounter;
667 2 }
668 1
669 1 // only HD support multiple partition
670 1 return 1;//return parCounter;
671 1 #endif
672 1
673 1 }
674
675 //This function will startup a read operation at address lba, only one sector each time
676 BYTE DriveRead(BYTE* buffer, UDWORD lba, BYTE offset)
677 {
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