通过stm32L152给SD卡创建文本，但是数据无法写入成功-y909334873的回答

20条回答

y909334873

2019-03-25 10:06

void Test_f_write(void)//写数据到文件，如果没有此文件则创建文件
{
FATFS fs; // Work area (file system object) for logical drive
FRESULT res; // FatFs function common result code
FIL Make_file;
char file_name[20]="jj.txt";
char Storage_buffer[] ="1234567890";
UINT bw;
//检测磁盘是否插好
if( disk_detect_OK()==FALSE ) return;
logout(" inaert_ok:>");
// Register a work area for logical drive 0
f_mount(0, &fs);
logout(" Make file Name:>");
// USART_Scanf_Name(file_name);//通过串口输入源文件路径名/dir/file.txt或者0:dir/file.txt或者0:/dir/file.txt
res = f_open(&Make_file, file_name, FA_OPEN_ALWAYS | FA_WRITE); //可写方式打开没有文件则创建
logout(" open_ok:>");
die(res);
res = f_lseek(&Make_file, bsize); //指针移到文件最后
logout(" seek_ok:>");
die(res);
res = f_write(&Make_file, Storage_buffer, (sizeof (Storage_buffer))-1 , &bw); //每次需要写入的数据字节数，去掉最后的所以-1
logout(" write_ok:>");
die(res);
//logout("文件大小=%d字节 ",Make_file.fsize);
res = f_lseek(&Make_file, Make_file.fsize); //指针移到文件最后
//logout("文件大小=%d字节 ",Make_file.fsize);
f_close(&Make_file);//关闭文件
logout(" close_ok:>");
//logout("文件大小=%d字节 ",Make_file.fsize);
logout(" 写文件测试OK! ");
// Unregister a work area before discard it
f_mount(0, NULL);
}
//其中调用的f_wriite函数如下
FRESULT f_write (
FIL *fp, /* Pointer to the file object */
const void *buff, /* Pointer to the data to be written */
UINT btw, /* Number of bytes to write */
UINT *bw /* Pointer to number of bytes written */
)
{
FRESULT res;
DWORD clst, sect;
UINT wcnt, cc;
const BYTE *wbuff = buff;
BYTE csect;
bsize+=btw;
*bw = 0; /* Initialize byte counter */
logout("1111111111111111111 ");
res = validate(fp->fs, fp->id); /* Check validity */
fp->fsize =fp->fsize +btw;
logout("wenjian=%d ",fp->fsize);
//f_sync (fp);
if (res != FR_OK) LEAVE_FF(fp->fs, res);
if (fp->flag & FA__ERROR) /* Aborted file? */
LEAVE_FF(fp->fs, FR_INT_ERR);
logout("22222222222222222222222222 ");
if (!(fp->flag & FA_WRITE)) /* Check access mode */
LEAVE_FF(fp->fs, FR_DENIED);
if ((DWORD)(fp->fsize + btw) < fp->fsize) btw = 0; /* File size cannot reach 4GB */
logout("333333333333333333333333 ");
for ( ; btw; /* Repeat until all data written */
wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) {
logout("44444444444444444 ");
if ((fp->fptr % SS(fp->fs)) == 0)
{ /* On the sector boundary? */
csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1)); /* Sector offset in the cluster */
if (!csect)
{
/* On the cluster boundary? */
if (fp->fptr == 0) { /* On the top of the file? */
clst = fp->sclust; /* Follow from the origin */
if (clst == 0) /* When no cluster is allocated, */
fp->sclust = clst = create_chain(fp->fs, 0); /* Create a new cluster chain */
} else { /* Middle or end of the file */
#if _USE_FASTSEEK
if (fp->cltbl)
clst = clmt_clust(fp, fp->fptr); /* Get cluster# from the CLMT */
else
#endif
clst = create_chain(fp->fs, fp->clust); /* Follow or stretch cluster chain on the FAT */
}
if (clst == 0) break; /* Could not allocate a new cluster (disk full) */
if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
fp->clust = clst; /* Update current cluster */
//fp->pad1 = 0;
}
#if _FS_TINY
if (fp->fs->winsect == fp->dsect && move_window(fp->fs, 0)) /* Write-back sector cache */
ABORT(fp->fs, FR_DISK_ERR);
#else
if (fp->flag & FA__DIRTY) { /* Write-back sector cache */
if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
ABORT(fp->fs, FR_DISK_ERR);
fp->flag &= ~FA__DIRTY;
}
#endif
sect = clust2sect(fp->fs, fp->clust); /* Get current sector */
if (!sect) ABORT(fp->fs, FR_INT_ERR);
sect += csect;
cc = btw / SS(fp->fs); /* When remaining bytes >= sector size, */
if (cc) { /* Write maximum contiguous sectors directly */
if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
cc = fp->fs->csize - csect;
if (disk_write(fp->fs->drv, wbuff, sect, (BYTE)cc) != RES_OK)
ABORT(fp->fs, FR_DISK_ERR);
#if _FS_TINY
if (fp->fs->winsect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs));
//logout("tiny");
fp->fs->wflag = 0;
}
#else
if (fp->dsect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
//logout("no tiny");
fp->flag &= ~FA__DIRTY;
}
#endif
wcnt = SS(fp->fs) * cc; /* Number of bytes transferred */
continue;
}
#if _FS_TINY
if (fp->fptr >= fp->fsize) { /* Avoid silly cache filling at growing edge */
if (move_window(fp->fs, 0)) ABORT(fp->fs, FR_DISK_ERR);
fp->fs->winsect = sect;
}
#else
if (fp->dsect != sect) { /* Fill sector cache with file data */
if (fp->fptr < fp->fsize &&
disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK)
ABORT(fp->fs, FR_DISK_ERR);
}
#endif
fp->dsect = sect;
}
logout("555555555555555555 ");
wcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs));/* Put partial sector into file I/O buffer */
if (wcnt > btw) wcnt = btw;
#if _FS_TINY
if (move_window(fp->fs, fp->dsect)) /* Move sector window */
ABORT(fp->fs, FR_DISK_ERR);
mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt); /* Fit partial sector */
fp->fs->wflag = 1;
#else
mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt); /* Fit partial sector */
fp->flag |= FA__DIRTY;
#endif
}
if (fp->fptr > fp->fsize)
fp->fsize = fp->fptr; /* Update file size if needed */
fp->flag |= FA__WRITTEN; /* Set file change flag */
LEAVE_FF(fp->fs, FR_OK);
}
//感觉涉及的函数有点多，不知道该贴些啥。。。

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