globals.c

linux下数据下载器的设计与实现

//-----------------------------------------------------------------------------
// File:      globals.c
// Contents:   contains all the global variables used by the firmware
//
// Format:  indent 3.  NO TABS!
//

//--------------------------------------------------------------------------

#include "globals.h"

BYTE   AlternateSetting;   // Alternate settings
BYTE   Configuration;      // Current configuration


WORD wPacketSize;
xdata volatile BYTE halfKBuffer[BUFFER_SIZE] _at_ 0xE000;
// Content of halfKBuffer:
// 0x000 - 0x100: copy of the dscr.a51
// 0x100 - 0x11F: SCSI Inquiry string
// 0x120 - 0x14F: USB String Descriptor-Index 0
// 0x150 - 0x17F: USB String Descriptor-Manufacturer - Index 1
// 0x180 - 0x1AF: USB String Descriptor-Product - Index 2
// 0x1B0 - 0x1DF: USB String Descriptor-Serial Number - Index 3
// 0x1E0 - 0x1FF: Reserved area for debug

WORD xdata cbwTagLow;          // Tag from the most recent CBW packet
WORD xdata cbwTagHi;

DWORD xdata dataTransferLen;

bit currentState;
bit directionIn;
bit phaseErrorState;
bit bShortPacketSent;
bit Sleep;
#ifdef USE_2LUN
bit bLUN1;
#endif


DWORD  dwLBA;         // This is global to help the optimizer
//sbit  bLBA0 = dwLBA ^ 24;  // bit0 of dwLBA

BYTE bdata NandCfg;     // bit0=cache read, bit1=prog cache, bit2=30ns/50ns
BYTE bdata FwCfg;       // bit0=WriteProtec, bit1=ECC enable
sbit b30nsCycle          = NandCfg ^ 2;
sbit bInternalMove       = NandCfg ^ 4;
sbit bSoftErr            = NandCfg ^ 5;

sbit bWriteProtectEnable = FwCfg ^ 0;
sbit bECCEnable          = FwCfg ^ 1;
sbit bInterLeave         = FwCfg ^ 2;
sbit bMsk                = FwCfg ^ 7;

// the bit global variables
BYTE bdata gNandBits;
sbit bNeedErase          = gNandBits ^ 0;
sbit bCnt                = gNandBits ^ 1;
sbit bReload             = gNandBits ^ 2;        
sbit bFreeFound          = gNandBits ^ 3;
sbit bEject              = gNandBits ^ 4;
sbit b2BitErr            = gNandBits ^ 5;
sbit bErr                = gNandBits ^ 6;
sbit bFreeBlk            = gNandBits ^ 7;


/////////////////////////////////////////////////////////////////////////////////////////
// NAND flash definitions
// 
// gBank -- Represents a physical NAND chip select.  A physical NAND package may have one or two
//          chip selects, therefore, one or two banks.  
// gCurZone -- Largest structure within the flash.  Each zone contains 1024 physical blocks
//             and 1000 logical blocks.
// gZones   -- Total number of Zones in a NAND Flash
// 
// gLog2Phy -- Table that maps the LBA received from the host into a physical address in the NAND.
//          This table contains the physical address.  It is indexed by the LBA.
//          A value of FFFF means that the LBA does not have a physical address yet.
//          This table is stored in the redundant area of the flash, one LBA per block.
/////////////////////////////////////////////////////////////////////////////////////////
//
// 128KByte flash chips with 512 byte pages have 
//       512 bytes per page, 32 pages per block for 16K blocks * 8 zones
// 2K pages have
//       2K bytes/page, 64 pages/block for 64K blocks * 2 zones
// 
//                          Zone = 1024 blocks (1000 LBAs)
//         /---------/---------/---------/---------/---------/---------/|
//        /---------/---------/---------/---------/---------/---------/||
//       /---------/---------/---------/---------/---------/---------/|||
//      |---------|---------|---------|---------|---------|---------|||||
//      |         |         |         |         |         |         ||||/              
// Block| Page    | Page    | Page    | Page    | Page    | Page    |||/               
//      |         |         |         |         |         |         ||/       
//      |---------|---------|---------|---------|---------|---------|/
//

DWORD gDriveCapacity;
WORD  gSectorcount;
BYTE  xdata gBank;                    // nand bank
bit   bWPSwitchState;           // Used to detect changes in the WP switch state
bit   bNand2k;