?? main.i
字號:
resp = rcvr_spi(); /* Reveive data response */
if ((resp & 0x1F) != 0x05) /* If not accepted, return with error */
return FALSE;
}
return TRUE;
}
/*-----------------------------------------------------------------------*/
/* Send a command packet to MMC */
/*-----------------------------------------------------------------------*/
static
BYTE send_cmd (
BYTE cmd, /* Command byte */
DWORD arg /* Argument */
)
{
BYTE n, res;
if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */
cmd &= 0x7F;
res = send_cmd((0x40+55) , 0);
if (res > 1) return res;
}
/* Select the card and wait for ready */
PORTD.7 = 1; ;
PORTD.7 = 0; ;
if (wait_ready() != 0xFF) return 0xFF;
/* Send command packet */
SPDR=(cmd); while(!(SPSR & (1<<7))); /* Command */
SPDR=((BYTE)(arg >> 24)); while(!(SPSR & (1<<7))); /* Argument[31..24] */
SPDR=((BYTE)(arg >> 16)); while(!(SPSR & (1<<7))); /* Argument[23..16] */
SPDR=((BYTE)(arg >> 8)); while(!(SPSR & (1<<7))); /* Argument[15..8] */
SPDR=((BYTE)arg); while(!(SPSR & (1<<7))); /* Argument[7..0] */
n = 0xFF; /* CRC */
if (cmd == (0x40+0) ) n = 0x95; /* CRC for CMD0(0) */
if (cmd == (0x40+8) ) n = 0x87; /* CRC for CMD8(0x1AA) */
SPDR=(n); while(!(SPSR & (1<<7)));
/* Receive command response */
if (cmd == (0x40+12) ) rcvr_spi(); /* Skip a stuff byte when stop reading */
n = 10; /* Wait for a valid response in timeout of 10 attempts */
do
res = rcvr_spi();
while ((res & 0x80) && --n);
return res; /* Return with the response value */
}
/*--------------------------------------------------------------------------
Public Functions
---------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------*/
/* Initialize Disk Drive */
/*-----------------------------------------------------------------------*/
DSTATUS disk_initialize (
BYTE drv /* Physical drive nmuber (0) */
)
{
BYTE n, cmd, ty, ocr[4];
if (drv) return 0x01 ; /* Supports only single drive */
if (Stat & 0x02 ) return Stat; /* No card in the socket */
power_on(); /* Force socket power on */
for (n = 10; n; n--) rcvr_spi(); /* 80 dummy clocks */
ty = 0;
if (send_cmd((0x40+0) , 0) == 1) { /* Enter Idle state */
Timer1 = 100; /* Initialization timeout of 1000 msec */
if (send_cmd((0x40+8) , 0x1AA) == 1) { /* SDHC */
for (n = 0; n < 4; n++) ocr[n] = rcvr_spi(); /* Get trailing return value of R7 resp */
if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
while (Timer1 && send_cmd((0xC0+41) , 1UL << 30)); /* Wait for leaving idle state (ACMD41 with HCS bit) */
if (Timer1 && send_cmd((0x40+58) , 0) == 0) { /* Check CCS bit in the OCR */
for (n = 0; n < 4; n++) ocr[n] = rcvr_spi();
ty = (ocr[0] & 0x40) ? 12 : 4;
}
}
} else { /* SDSC or MMC */
if (send_cmd((0xC0+41) , 0) <= 1) {
ty = 2; cmd = (0xC0+41) ; /* SDSC */
} else {
ty = 1; cmd = (0x40+1) ; /* MMC */
}
while (Timer1 && send_cmd(cmd, 0)); /* Wait for leaving idle state */
if (!Timer1 || send_cmd((0x40+16) , 512) != 0) /* Set R/W block length to 512 */
ty = 0;
}
}
CardType = ty;
release_spi();
if (ty) { /* Initialization succeded */
Stat &= ~0x01 ; /* Clear STA_NOINIT */
} else { /* Initialization failed */
power_off();
}
return Stat;
}
/*-----------------------------------------------------------------------*/
/* Get Disk Status */
/*-----------------------------------------------------------------------*/
DSTATUS disk_status (
BYTE drv /* Physical drive nmuber (0) */
)
{
if (drv) return 0x01 ; /* Supports only single drive */
return Stat;
}
/*-----------------------------------------------------------------------*/
/* Read Sector(s) */
/*-----------------------------------------------------------------------*/
DRESULT disk_read (
BYTE drv, /* Physical drive nmuber (0) */
BYTE *buff, /* Pointer to the data buffer to store read data */
DWORD sector, /* Start sector number (LBA) */
BYTE count /* Sector count (1..255) */
)
{
if (drv || !count) return RES_PARERR;
if (Stat & 0x01 ) return RES_NOTRDY;
if (!(CardType & 8)) sector *= 512; /* Convert to byte address if needed */
if (count == 1) { /* Single block read */
if ((send_cmd((0x40+17) , sector) == 0) /* READ_SINGLE_BLOCK */
&& rcvr_datablock(buff, 512))
count = 0;
}
else { /* Multiple block read */
if (send_cmd((0x40+18) , sector) == 0) { /* READ_MULTIPLE_BLOCK */
do {
if (!rcvr_datablock(buff, 512)) break;
buff += 512;
} while (--count);
send_cmd((0x40+12) , 0); /* STOP_TRANSMISSION */
}
}
release_spi();
return count ? RES_ERROR : RES_OK;
}
/*-----------------------------------------------------------------------*/
/* Write Sector(s) */
/*-----------------------------------------------------------------------*/
DRESULT disk_write (
BYTE drv, /* Physical drive nmuber (0) */
const BYTE *buff, /* Pointer to the data to be written */
DWORD sector, /* Start sector number (LBA) */
BYTE count /* Sector count (1..255) */
)
{
if (drv || !count) return RES_PARERR;
if (Stat & 0x01 ) return RES_NOTRDY;
if (Stat & 0x04 ) return RES_WRPRT;
if (!(CardType & 8)) sector *= 512; /* Convert to byte address if needed */
if (count == 1) { /* Single block write */
if ((send_cmd((0x40+24) , sector) == 0) /* WRITE_BLOCK */
&& xmit_datablock(buff, 0xFE))
count = 0;
}
else { /* Multiple block write */
if (CardType & 6) send_cmd((0xC0+23) , count);
if (send_cmd((0x40+25) , 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;
}
}
release_spi();
return count ? RES_ERROR : RES_OK;
}
/*-----------------------------------------------------------------------*/
/* Miscellaneous Functions */
/*-----------------------------------------------------------------------*/
DRESULT disk_ioctl (
BYTE drv, /* Physical drive nmuber (0) */
BYTE ctrl, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
DRESULT res;
BYTE n, csd[16], *ptr = buff;
WORD csize;
if (drv) return RES_PARERR;
res = RES_ERROR;
if (ctrl == 4) {
switch (*ptr) {
case 0: /* Sub control code == 0 (POWER_OFF) */
if (chk_power())
power_off(); /* Power off */
res = RES_OK;
break;
case 1: /* Sub control code == 1 (POWER_ON) */
power_on(); /* Power on */
res = RES_OK;
break;
case 2: /* Sub control code == 2 (POWER_GET) */
*(ptr+1) = (BYTE)chk_power();
res = RES_OK;
break;
default :
res = RES_PARERR;
}
}
else {
if (Stat & 0x01 ) return RES_NOTRDY;
switch (ctrl) {
case 0 : /* Make sure that no pending write process */
PORTD.7 = 0; ;
if (wait_ready() == 0xFF)
res = RES_OK;
break;
case 1 : /* Get number of sectors on the disk (DWORD) */
if ((send_cmd((0x40+9) , 0) == 0) && rcvr_datablock(csd, 16)) {
if ((csd[0] >> 6) == 1) { /* SDC ver 2.00 */
csize = csd[9] + ((WORD)csd[8] << 8) + 1;
*(DWORD*)buff = (DWORD)csize << 10;
} else { /* SDC ver 1.XX or MMC*/
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 = (DWORD)csize << (n - 9);
}
res = RES_OK;
}
break;
case 2 : /* Get R/W sector size (WORD) */
*(WORD*)buff = 512;
res = RES_OK;
break;
case 3 : /* Get erase block size in unit of sector (DWORD) */
if (CardType & 4) { /* SDC ver 2.00 */
if (send_cmd((0xC0+13) , 0) == 0) { /* Read SD status */
rcvr_spi();
if (rcvr_datablock(csd, 16)) { /* Read partial block */
for (n = 64 - 16; n; n--) rcvr_spi(); /* Purge trailing data */
*(DWORD*)buff = 16UL << (csd[10] >> 4);
res = RES_OK;
}
}
} else { /* SDC ver 1.XX or MMC */
if ((send_cmd((0x40+9) , 0) == 0) && rcvr_datablock(csd, 16)) { /* Read CSD */
if (CardType & 2) { /* SDC ver 1.XX */
#pragma warn-
*(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);
#pragma warn+
}
res = RES_OK;
}
}
break;
case 10 : /* Get card type flags (1 byte) */
*ptr = CardType;
res = RES_OK;
break;
case 11 : /* Receive CSD as a data block (16 bytes) */
if (send_cmd((0x40+9) , 0) == 0 /* READ_CSD */
&& rcvr_datablock(ptr, 16))
res = RES_OK;
break;
case 12 : /* Receive CID as a data block (16 bytes) */
if (send_cmd((0x40+10) , 0) == 0 /* READ_CID */
&& rcvr_datablock(ptr, 16))
res = RES_OK;
break;
case 13 : /* Receive OCR as an R3 resp (4 bytes) */
if (send_cmd((0x40+58) , 0) == 0) { /* READ_OCR */
for (n = 4; n; n--) *ptr++ = rcvr_spi();
res = RES_OK;
}
break;
case 14 : /* Receive SD statsu as a data block (64 bytes) */
if (send_cmd((0xC0+13) , 0) == 0) { /* SD_STATUS */
rcvr_spi();
if (rcvr_datablock(ptr, 64))
res = RES_OK;
}
break;
default:
res = RES_PARERR;
}
release_spi();
}
return res;
}
/*-----------------------------------------------------------------------*/
/* Device Timer Interrupt Procedure (Platform dependent) */
/*-----------------------------------------------------------------------*/
/* This function must be called in period of 10ms */
void disk_timerproc (void)
{
static BYTE pv;
BYTE n, s;
n = Timer1; /* 100Hz decrement timer */
if (n) Timer1 = --n;
n = Timer2;
if (n) Timer2 = --n;
n = pv;
pv = PINB & (0 | 0 ); /* Sample socket switch */
if (n == pv) { /* Have contacts stabled? */
s = Stat;
if (pv & 0 ) /* WP is H (write protected) */
s |= 0x04 ;
else /* WP is L (write enabled) */
s &= ~0x04 ;
if (pv & 0 ) /* INS = H (Socket empty) */
s |= (0x02 | 0x01 );
else /* INS = L (Card inserted) */
s &= ~0x02 ;
Stat = s;
}
}
/*--------------------------------------------------------------------------/
/ FatFs - Tiny FAT file system module R0.05 (C)ChaN, 2007
/
/ Ported To CodevisionAVR By Behzad Khazama www.khazama.com Sabzevar-IRAN 2007
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