接續上一篇
FATFS是功能完整的檔案系統
但需要移稙的檔案也就比較多
1. disk_status
/*-----------------------------------------------------------------------*/
/* Get disk status */
/*-----------------------------------------------------------------------*/
/* Physical drive number (0) */
DSTATUS disk_status(BYTE drv)
{
if (drv)
return STA_NOINIT; /* Supports only drive 0 */
return Stat; /* Return disk status */
}
2. disk_initialize
/*-----------------------------------------------------------------------*/
/* Initialize disk drive */
/*-----------------------------------------------------------------------*/
/* Physical drive number (0) */
DSTATUS disk_initialize (BYTE drv)
{
BYTE n, cmd, ty, ocr[4];
if(drv)
return STA_NOINIT; /* Supports only drive 0 */
init_spi(); /* Initialize SPI */
if(Stat & STA_NODISK)
return Stat; /* Is card existing in the soket? */
FCLK_SLOW();
for (n = 10; n; n--)
spi_wr(0xFF); /* Send 80 dummy clocks */
ty = 0;
if (send_cmd(CMD0, 0) == 1)
{ /* Put the card SPI/Idle state */
Timer1 = 1000; /* Initialization timeout = 1 sec */
if (send_cmd(CMD8, 0x1AA) == 1)
{ /* SDv2? */
for (n = 0; n < 4; n++)
ocr[n] = spi_wr(0xFF); /* Get 32 bit return value of R7 resp */
if (ocr[2] == 0x01 && ocr[3] == 0xAA)
{ /* Is the card supports vcc of 2.7-3.6V? */
while (Timer1 && send_cmd(ACMD41, 1UL << 30)); /* Wait for end of initialization with ACMD41(HCS) */
if (Timer1 && send_cmd(CMD58, 0) == 0)
{ /* Check CCS bit in the OCR */
for (n = 0; n < 4; n++) ocr[n] = spi_wr(0xFF);
if(ocr[0] & 0x40)
ty = CT_SD2 | CT_BLOCK;
else
ty = CT_SD2;
//ty = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* Card id SDv2 */
}
}
}
else
{ /* Not SDv2 card */
if (send_cmd(ACMD41, 0) <= 1)
{ /* SDv1 or MMC? */
ty = CT_SD1; cmd = ACMD41; /* SDv1 (ACMD41(0)) */
}
else
{
ty = CT_MMC; cmd = CMD1; /* MMCv3 (CMD1(0)) */
}
while (Timer1 && send_cmd(cmd, 0)) ; /* Wait for end of initialization */
if (!Timer1 || send_cmd(CMD16, 512) != 0) /* Set block length: 512 */
ty = 0;
}
}
CardType = ty; /* Card type */
deselect();
if (ty)
{ /* OK */
FCLK_FAST(); /* Set fast clock */
Stat &= ~STA_NOINIT; /* Clear STA_NOINIT flag */
}
else
{ /* Failed */
Stat = STA_NOINIT;
}
return Stat;
}
3. disk_read
/*-----------------------------------------------------------------------*/
/* Read sector(s) */
/*-----------------------------------------------------------------------*/
/* Physical drive number (0) */
/* Pointer to the data buffer to store read data */
/* Start sector number (LBA) */
/* Number of sectors to read (1..128) */
DRESULT disk_read(BYTE drv,BYTE *buff,DWORD sector,UINT count)
{
if (drv || !count)
return RES_PARERR; /* Check parameter */
if (Stat & STA_NOINIT)
return RES_NOTRDY; /* Check if drive is ready */
if (!(CardType & CT_BLOCK))
sector *= 512; /* LBA ot BA conversion (byte addressing cards) */
if (count == 1)
{ /* Single sector read */
if ((send_cmd(CMD17, sector) == 0)&& rcvr_datablock(buff, 512)) /* READ_SINGLE_BLOCK */
count = 0;
}
else
{ /* Multiple sector read */
if (send_cmd(CMD18, sector) == 0)
{ /* READ_MULTIPLE_BLOCK */
do{
if (!rcvr_datablock(buff, 512))
break;
buff += 512;
} while (--count);
send_cmd(CMD12, 0); /* STOP_TRANSMISSION */
}
}
deselect();
if(count)
return RES_ERROR;
else
return RES_OK;
}
4. disk_write
/*-----------------------------------------------------------------------*/
/* Write sector(s) */
/*-----------------------------------------------------------------------*/
/* Physical drive number (0) */
/* Ponter to the data to write */
/* Start sector number (LBA) */
/* Number of sectors to write (1..128) */
#if _USE_WRITE
DRESULT disk_write(BYTE drv,const BYTE *buff,DWORD sector,UINT count)
{
if (drv || !count)
return RES_PARERR; /* Check parameter */
if (Stat & STA_NOINIT)
return RES_NOTRDY; /* Check drive status */
if (Stat & STA_PROTECT)
return RES_WRPRT; /* Check write protect */
if (!(CardType & CT_BLOCK))
sector *= 512; /* LBA ==> BA conversion (byte addressing cards) */
if (count == 1)
{ /* Single sector write */
if ((send_cmd(CMD24, sector) == 0)&& xmit_datablock(buff, 0xFE)) /* WRITE_BLOCK */
count = 0;
}
else
{ /* Multiple sector write */
if (CardType & CT_SDC)
send_cmd(ACMD23, count); /* Predefine number of sectors */
if (send_cmd(CMD25, sector) == 0)
{ /* WRITE_MULTIPLE_BLOCK */
do{
if (!xmit_datablock(buff, 0xFC))
break;
buff += 512;
} while (--count);
if (!xmit_datablock(0, 0xFD)) /* STOP_TRAN token */
count = 1;
}
}
deselect();
if(count)
return RES_ERROR;
else
return RES_OK;
}
#endif
5. disk_ioctl
/*-----------------------------------------------------------------------*/
/* Miscellaneous drive controls other than data read/write */
/*-----------------------------------------------------------------------*/
/* Physical drive number (0) */
/* Control command code */
/* Pointer to the conrtol data */
#if _USE_IOCTL
DRESULT disk_ioctl(BYTE drv,BYTE cmd,void *buff)
{
DRESULT res;
BYTE n, csd[16];
DWORD *dp, st, ed, csize;
if (drv)
return RES_PARERR; /* Check parameter */
if (Stat & STA_NOINIT)
return RES_NOTRDY; /* Check if drive is ready */
res = RES_ERROR;
switch (cmd)
{
case CTRL_SYNC : /* Wait for end of internal write process of the drive */
if (select())
res = RES_OK;
break;
case GET_SECTOR_COUNT : /* Get drive capacity in unit of sector (DWORD) */
if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16))
{
if ((csd[0] >> 6) == 1)
{ /* SDC ver 2.00 */
csize = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
*(DWORD*)buff = csize << 10;
}
else
{ /* SDC ver 1.XX or MMC ver 3 */
n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
csize = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
*(DWORD*)buff = csize << (n - 9);
}
res = RES_OK;
}
break;
case GET_BLOCK_SIZE : /* Get erase block size in unit of sector (DWORD) */
if (CardType & CT_SD2)
{ /* SDC ver 2.00 */
if (send_cmd(ACMD13, 0) == 0)
{ /* Read SD status */
spi_wr(0xFF);
if (rcvr_datablock(csd, 16))
{ /* Read partial block */
for (n = 64 - 16; n; n--)
spi_wr(0xFF); /* Purge trailing data */
*(DWORD*)buff = 16UL << (csd[10] >> 4);
res = RES_OK;
}
}
}
else
{ /* SDC ver 1.XX or MMC */
if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16))
{ /* Read CSD */
if (CardType & CT_SD1)
{ /* SDC ver 1.XX */
*(DWORD*)buff = (((csd[10] & 63) << 1) + ((WORD)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1);
}
else
{ /* MMC */
*(DWORD*)buff = ((WORD)((csd[10] & 124) >> 2) + 1) * (((csd[11] & 3) << 3) + ((csd[11] & 224) >> 5) + 1);
}
res = RES_OK;
}
}
break;
case CTRL_ERASE_SECTOR : /* Erase a block of sectors (used when _USE_ERASE == 1) */
if (!(CardType & CT_SDC))
break; /* Check if the card is SDC */
if (disk_ioctl(drv, MMC_GET_CSD, csd))
break; /* Get CSD */
if (!(csd[0] >> 6) && !(csd[10] & 0x40))
break; /* Check if sector erase can be applied to the card */
dp = buff; st = dp[0]; ed = dp[1]; /* Load sector block */
if (!(CardType & CT_BLOCK))
{
st *= 512; ed *= 512;
}
if (send_cmd(CMD32, st) == 0 && send_cmd(CMD33, ed) == 0 && send_cmd(CMD38, 0) == 0 && wait_ready(30000)) /* Erase sector block */
res = RES_OK; /* FatFs does not check result of this command */
break;
default:
res = RES_PARERR;
}
deselect();
return res;
}
#endif
6. disk_fattime
DWORD get_fattime(void)
{
//RTCTIME rtc;
/* Get local time */
// if (!rtc_gettime(&rtc)) return 0;
/* Pack date and time into a DWORD variable */
return ((DWORD)(2014 - 1980) << 25)
| ((DWORD)3 << 21)
| ((DWORD)27 << 16)
| ((DWORD)16 << 11)
| ((DWORD)22 << 5)
| ((DWORD)30 >> 1);
}
沒用真的RTC下去做測試
Demo code 一樣有KEIL 和 IAR
FATFS for nuc122
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