[VxWorks] 求教VxWorks 的DOSFS 在SD卡上的构建

juwen163 2012-2-25 16:45 楼主

我在SD卡上构建dosfs文件系统是总是出错：

代码如下

#include "copyright_wrs.h"
#include "vxWorks.h"
#include "taskLib.h"
#include "blkIo.h"
#include "stdlib.h"
#include "stdio.h"
#include "string.h"
#include "dosFsLib.h"
#include "usrFdiskPartLib.h"
#include "private/dosFsLibP.h" /* for byte swapping macros */
#include "dpartCbio.h"
#include "cbioLib.h"
#include "semLib.h"

#include "fat.h"

#define FD_DEBUG
/*******************************************/
static SEM_ID McSem;BcSem;
static int sdDrvInstalled = 0;
/*******************************************/

LOCAL STATUS sdBlkRd (SD_DEV *pFdDev, int startBlk, int nBlks, char *pBuf);
LOCAL STATUS sdBlkWrt (SD_DEV *pFdDev, int startBlk, int nBlks, char *pBuf);
LOCAL STATUS sdIoctl (SD_DEV *pFdDev, int function, int arg);

LOCAL void sdInit(void);

LOCAL STATUS sdFormat(SD_DEV *pFdDev,int ty);
/******************************************************************/
/******************************************************************/
int n = 0;

/******************* 487424 ********************/
int test(int m)
{
FILE *fp;
char *mm="fsasdfafuiyfhrlfjvifgyruigjfklghidfhgidfjghihydirgj";
if(n==0)
{
   sdDrv();
   printf("\nCreate FILE system 0 ``````````````````````````````\n");
   usrSdConfig(0, m*2048, 0, "/f");//创建文件系统

dosFsShow ("/f", 1);

   n=1;
   fp = fopen("/f/b.txt","wb+");//创建文件
   if(fp==NULL)
     printf("can not Create file :b.txt\n");
   fread(mm,25,1,fp);//写入数据
   fclose(fp);
   }
   else
   {
    printf("\nCreate FILE system 1 ``````````````````````````````\n");
    usrSdConfig(1, m*2048, 102400, "/ff");//dosFsInit (20);487424
    dosFsShow ("/ff", 1);
   }
}
/******************************************************************/
/******************************************************************/
STATUS usrSdConfig(int drive,int nBlocks, int blkOffset, char *fileName)
{
    BLK_DEV * pBlkDev;
    DOS_VOL_DESC * pVolDesc = NULL;
    char devName [16];

    if ((UINT)drive >= SD_MAX_DRIVES)
{
     printErr ("drive is out of range (0-%d).\n", SD_MAX_DRIVES - 1);
     return (ERROR);
}

    if ((pBlkDev = sdDevCreate (drive, nBlocks, blkOffset,fileName)) == NULL)
{
            printErr ("sdDevCreate failed.\n");
            return (ERROR);
}
    devSplit( fileName, devName);// Make DOS file system
    pVolDesc = dosFsDevInit(devName, pBlkDev, NULL);
    if (pVolDesc == NULL)
      {
    printErr ("Error during dosFsDevInit in usrSdConfig: %x\n", errno);
           return (ERROR);
      }
    if (dosFsVolFormat (devName, DOS_OPT_FAT16, NULL) != OK)//以FAT16格式创建文件系统
        return ERROR;
    //if (dosFsVolFormat (devName, DOS_OPT_VXLONGNAMES, NULL) != OK)
    //    return ERROR;
    //dosFsMkfs(devName,pBlkDev);
    return OK;
}
/**************************************************************************/
/**************************************************************************/
STATUS sdDrv(void)
{
    if (!sdDrvInstalled)
{
         BcSem = semBCreate(SEM_Q_PRIORITY, SEM_EMPTY);
         McSem = semMCreate(SEM_Q_PRIORITY);//创建互斥信号量
         if( (BcSem==NULL)||(McSem==NULL) )
              return ERROR;
         sdInit ();
sdDrvInstalled = TRUE;
}
    return (OK);
}
/****************************************************************************/
/****************************************************************************/
BLK_DEV *sdDevCreate(int drive,int nBlocks,int blkOffset,char *driName)
{
    SD_DEV *pSdDev;
    BLK_DEV *pBlkDev;
    unsigned int Blocks;

if (!sdDrvInstalled)
return (NULL);

if (nBlocks == 0)
Blocks = 2048*4;
else Blocks = nBlocks;

if ((UINT)drive >= SD_MAX_DRIVES)
return (NULL);

if ((pSdDev = (SD_DEV *)calloc(sizeof (SD_DEV), 1)) == NULL)
return (NULL);

pBlkDev = &pSdDev->blkDev;

    pBlkDev->bd_nBlocks  = Blocks;        //设备的块数
    pBlkDev->bd_bytesPerBlk = SD_BLOCK_SIZE; //每块的字节数512
    pBlkDev->bd_blksPerTrack    = 487424; //0X3F; //每磁道(扇区)的块数//Blocks 4096-16 2048-32 63;
    pBlkDev->bd_nHeads         = 1;//0XFF;//1;             //磁头数 255
    pBlkDev->bd_removable = TRUE;          //FALSE;//是否可移动标志
    pBlkDev->bd_retry         = 2;             //出错重试次数
    pBlkDev->bd_mode  = O_RDWR;        //O_WRONLY|O_RDONLY|O_RDWR;设备初始模式
    pBlkDev->bd_readyChanged = TRUE;
    pBlkDev->bd_blkRd  = sdBlkRd;
    pBlkDev->bd_blkWrt  = sdBlkWrt;
    pBlkDev->bd_ioctl  = sdIoctl;
    pBlkDev->bd_reset  = NULL;          //sdReset;
    pBlkDev->bd_statusChk = NULL;          //sdStatusChk;

    pSdDev->drive  = drive;
    pSdDev->driName             = driName;
    pSdDev->blkOffset  = blkOffset;
    pSdDev->driveSize           = Blocks * SD_BLOCK_SIZE;
    return (&pSdDev->blkDev);
}
/***************************************************************************/
/****************************************************************************/
LOCAL STATUS sdBlkRd(SD_DEV *pSdDev,int startBlk,int nBlks,char *pBuf)
{
    int status  = ERROR;
#ifdef FD_DEBUG
    printf("read: startBlk = %d nBlks = %d\n ",startBlk+pSdDev->blkOffset, nBlks);
#endif
    semTake(McSem,WAIT_FOREVER);//获得信号量
    status = SDReadSector(startBlk+pSdDev->blkOffset,pBuf,nBlks);//SD 卡连续读 n 快的数据
    semGive(McSem);
    return (OK);
}
/*******************************************************************************
/****************************************************************************/
LOCAL STATUS sdBlkWrt(SD_DEV *pSdDev,int startBlk,int nBlks,char *pBuf)
{
    int status  = ERROR;
#ifdef FD_DEBUG
    printf("write: startBlk = %d nBlks = %d\n ",startBlk+pSdDev->blkOffset, nBlks);
#endif
    semTake(McSem,WAIT_FOREVER);
    status = SDWriteSector(startBlk+pSdDev->blkOffset,pBuf,nBlks);//SD 卡连续写 n 快的数据

    semGive(McSem);
    return (OK);
}
/*******************************************************************************
/****************************************************************************/
LOCAL STATUS sdIoctl(SD_DEV *pSdDev,int function,int arg)
{
    FAST int status = ERROR;
    switch (function)
      {
case FIODISKFORMAT:
#ifdef FD_DEBUG
        printf("dosFsVolFormat DOS_OPT_FAT16\n ");
#endif
                dosFsDevInit(pSdDev->driName, &pSdDev->blkDev, NULL);
  if(sdFormat(pSdDev, DOS_OPT_FAT16) != OK)
           (void) errnoSet (S_ioLib_DEVICE_ERROR);
         status = OK;
         break;
case FIODISKINIT:
#ifdef FD_DEBUG
        printf("dosFsDevInit DOS_OPT_FAT16\n ");
#endif
                if( dosFsDevInit(pSdDev->driName, &pSdDev->blkDev, NULL) == NULL )
                  {
              printf("Error during dosFsDevInit\n");
                     return (ERROR);
                  }
                sdFormat(pSdDev, DOS_OPT_FAT16);
         status = OK;
         break;

default: printf("nothing\n ");
           (void) errnoSet (S_ioLib_UNKNOWN_REQUEST);
       }
    return (status);
}
/*******************************************************************************
/****************************************************************************/
LOCAL void sdInit (void)
{
    semTake(McSem,WAIT_FOREVER);
    SDWtReInit();
    semGive(McSem);
#ifdef FD_DEBUG
    printErr ("sdInit\n");
#endif /* FD_DEBUG */
}
/*******************************************************************************
/****************************************************************************/
LOCAL STATUS sdFormat(SD_DEV *pFdDev,int ty)
{
    semTake(McSem,WAIT_FOREVER);
    if(dosFsVolFormat (pFdDev->driName, ty, NULL) != OK)
         return ERROR;
    semGive(McSem);
#ifdef FD_DEBUG
        printErr ("fdFormat: ");
        printErr ("drive:    %d\n ", pFdDev->drive);
        printErr ("name:     %s\n ", pFdDev->driName);
        printErr ("size:     %d\n ", pFdDev->driveSize);
        printErr ("blkOffset:%d\n ", pFdDev->blkOffset);
#endif /* FD_DEBUG */
    return (OK);
}

出错的应该是在红色表示的地方

主函数 text 输入的参数只能小于等于 4 就能创建小于等于 4MB的系统空间不然就没法创建，在创建了 4 MB空间后能创建 b.txt 文件但是但执行fread函数写入字符串时有些不进去但电脑里打开这个文件发现没把应该写进来的字符串写进来，我在 sdDevCreate 函数红色区域尝试了多种参数设置还是不行，就只能创建 4MB 空间能创建文件而不能写文件的数据；我的SD卡是256MB的；还请高手指点指点，我把 dosfs 需要的库都添加了；当创建大于 4MB空间是就会出现如下错误：

problem finding volume data ,trying to use the next block as boot block
ensure this device is formatted and partitions are properly handled
具体是说 0 扇区数据畸形啊什么的就起始扇区格式不对；

回复评论（1）

沙发 zh794390558

同求答案。

同求答案。为什么格式化会畸形。

点赞 2013-2-1 00:33

[VxWorks] 求教VxWorks 的DOSFS 在SD卡上的构建

回复评论 （1）

沙发 zh794390558

同求答案。

回复评论（1）