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fatfs: add support for small disc sizes (less then 16 MB)

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Dmitry Yakovlev 2017-03-24 03:45:05 +03:00 committed by Ivan Grokhotkov
parent 7388efa953
commit aeabbd305c
1 changed files with 12 additions and 6 deletions
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18
components/fatfs/src/ff.c
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@ -5665,6 +5665,9 @@ FRESULT f_mkfs (
/* Create partition table on the physical drive */
/*-----------------------------------------------------------------------*/
#define CLUSTER_SIZE 63
#define SUPPORTED_FLASH_SIZE 0x1000
FRESULT f_fdisk (
BYTE pdrv, /* Physical drive number */
const DWORD* szt, /* Pointer to the size table for each partitions */
@ -5675,18 +5678,21 @@ FRESULT f_fdisk (
BYTE s_hd, e_hd, *p, *buf = (BYTE*)work;
DSTATUS stat;
DWORD sz_disk, sz_part, s_part;
DWORD cluster_size = CLUSTER_SIZE;
stat = disk_initialize(pdrv);
if (stat & STA_NOINIT) return FR_NOT_READY;
if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) return FR_DISK_ERR;
/* Determine the CHS without any care of the drive geometry */
for (n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2) ;
for (n = 16; n < 256 && sz_disk / n / cluster_size > 1024; n *= 2) ;
if (n == 256) n--;
if (sz_disk < SUPPORTED_FLASH_SIZE) {
cluster_size = 1;
n = sz_disk;
}
e_hd = n - 1;
sz_cyl = 63 * n;
sz_cyl = cluster_size * n;
tot_cyl = sz_disk / sz_cyl;
/* Create partition table */
@ -5699,7 +5705,7 @@ FRESULT f_fdisk (
sz_part = (DWORD)sz_cyl * p_cyl;
if (i == 0) { /* Exclude first track of cylinder 0 */
s_hd = 1;
s_part += 63; sz_part -= 63;
s_part += cluster_size; sz_part -= cluster_size;
} else {
s_hd = 0;
}
@ -5712,7 +5718,7 @@ FRESULT f_fdisk (
p[3] = (BYTE)b_cyl; /* Start cylinder */
p[4] = 0x06; /* System type (temporary setting) */
p[5] = e_hd; /* End head */
p[6] = (BYTE)((e_cyl >> 2) + 63); /* End sector */
p[6] = (BYTE)((e_cyl >> 2) + cluster_size); /* End sector */
p[7] = (BYTE)e_cyl; /* End cylinder */
st_dword(p + 8, s_part); /* Start sector in LBA */
st_dword(p + 12, sz_part); /* Partition size */