diff options
Diffstat (limited to 'diskio.c')
| -rw-r--r-- | diskio.c | 600 |
1 files changed, 600 insertions, 0 deletions
diff --git a/diskio.c b/diskio.c new file mode 100644 index 0000000..528535a --- /dev/null +++ b/diskio.c @@ -0,0 +1,600 @@ +/*-----------------------------------------------------------------------*/ +/* MMCv3/SDv1/SDv2 (in SPI mode) control module (C)ChaN, 2010 */ +/*-----------------------------------------------------------------------*/ + +#include <avr/io.h> +#include "diskio.h" + + +/* Port controls (Platform dependent) */ +#define CS_LOW() PORTB &= ~1 /* CS=low */ +#define CS_HIGH() PORTB |= 1 /* CS=high */ +#define FCLK_SLOW() SPCR = 0x52 /* Set slow clock (F_CPU / 64) */ +#define FCLK_FAST() SPCR = 0x50 /* Set fast clock (F_CPU / 2) */ + + +/*-------------------------------------------------------------------------- + + Module Private Functions + +---------------------------------------------------------------------------*/ + +/* Definitions for MMC/SDC command */ +#define CMD0 (0) /* GO_IDLE_STATE */ +#define CMD1 (1) /* SEND_OP_COND (MMC) */ +#define ACMD41 (0x80+41) /* SEND_OP_COND (SDC) */ +#define CMD8 (8) /* SEND_IF_COND */ +#define CMD9 (9) /* SEND_CSD */ +#define CMD10 (10) /* SEND_CID */ +#define CMD12 (12) /* STOP_TRANSMISSION */ +#define ACMD13 (0x80+13) /* SD_STATUS (SDC) */ +#define CMD16 (16) /* SET_BLOCKLEN */ +#define CMD17 (17) /* READ_SINGLE_BLOCK */ +#define CMD18 (18) /* READ_MULTIPLE_BLOCK */ +#define CMD23 (23) /* SET_BLOCK_COUNT (MMC) */ +#define ACMD23 (0x80+23) /* SET_WR_BLK_ERASE_COUNT (SDC) */ +#define CMD24 (24) /* WRITE_BLOCK */ +#define CMD25 (25) /* WRITE_MULTIPLE_BLOCK */ +#define CMD32 (32) /* ERASE_ER_BLK_START */ +#define CMD33 (33) /* ERASE_ER_BLK_END */ +#define CMD38 (38) /* ERASE */ +#define CMD55 (55) /* APP_CMD */ +#define CMD58 (58) /* READ_OCR */ + + +static volatile +DSTATUS Stat = STA_NOINIT; /* Disk status */ + +static volatile +BYTE Timer1, Timer2; /* 100Hz decrement timer */ + +static +BYTE CardType; /* Card type flags */ + + +/*-----------------------------------------------------------------------*/ +/* Power Control (Platform dependent) */ +/*-----------------------------------------------------------------------*/ +/* When the target system does not support socket power control, there */ +/* is nothing to do in these functions and chk_power always returns 1. */ + +static +int power_status (void) /* Socket power state: 0=off, 1=on */ +{ + return 1;//(PORTE & _BV(7)) ? 0 : 1; +} + +static +void power_on (void) +{ + PORTB |= 0b00000101; /* Configure SCK/MOSI/CS as output */ + DDRB |= 0b00000111; + + SPCR = 0x52; /* Enable SPI function in mode 0 */ + SPSR = 0x01; /* SPI 2x mode */ +} + +static +void power_off (void) +{ + SPCR = 0; /* Disable SPI function */ + + DDRB &= ~0b00000111; /* Set SCK/MOSI/CS as hi-z, INS#/WP as pull-up */ + PORTB &= ~0b00000111; +} + + + +/*-----------------------------------------------------------------------*/ +/* Transmit/Receive data from/to MMC via SPI (Platform dependent) */ +/*-----------------------------------------------------------------------*/ + +/* Exchange a byte */ +static +BYTE xchg_spi ( /* Returns received data */ + BYTE dat /* Data to be sent */ +) +{ + SPDR = dat; + loop_until_bit_is_set(SPSR, SPIF); + return SPDR; +} + +/* Send a data block fast */ +static +void xmit_spi_multi ( + const BYTE *p, /* Data block to be sent */ + UINT cnt /* Size of data block */ +) +{ + do { + SPDR = *p++; loop_until_bit_is_set(SPSR,SPIF); + SPDR = *p++; loop_until_bit_is_set(SPSR,SPIF); + } while (cnt -= 2); +} + +/* Receive a data block fast */ +static +void rcvr_spi_multi ( + BYTE *p, /* Data buffer */ + UINT cnt /* Size of data block */ +) +{ + do { + SPDR = 0xFF; loop_until_bit_is_set(SPSR,SPIF); *p++ = SPDR; + SPDR = 0xFF; loop_until_bit_is_set(SPSR,SPIF); *p++ = SPDR; + } while (cnt -= 2); +} + + + +/*-----------------------------------------------------------------------*/ +/* Wait for card ready */ +/*-----------------------------------------------------------------------*/ + +static +int wait_ready ( /* 1:Ready, 0:Timeout */ + UINT wt /* Timeout [ms] */ +) +{ + BYTE d; + + + Timer2 = wt / 10; + do + d = xchg_spi(0xFF); + while (d != 0xFF && Timer2); + + return (d == 0xFF) ? 1 : 0; +} + + + +/*-----------------------------------------------------------------------*/ +/* Deselect the card and release SPI bus */ +/*-----------------------------------------------------------------------*/ + +static +void deselect (void) +{ + CS_HIGH(); + xchg_spi(0xFF); /* Dummy clock (force DO hi-z for multiple slave SPI) */ +} + + + +/*-----------------------------------------------------------------------*/ +/* Select the card and wait for ready */ +/*-----------------------------------------------------------------------*/ + +static +int select (void) /* 1:Successful, 0:Timeout */ +{ + CS_LOW(); + xchg_spi(0xFF); /* Dummy clock (force DO enabled) */ + + if (wait_ready(500)) return 1; /* OK */ + deselect(); + return 0; /* Timeout */ +} + + + +/*-----------------------------------------------------------------------*/ +/* Receive a data packet from MMC */ +/*-----------------------------------------------------------------------*/ + +static +int rcvr_datablock ( + BYTE *buff, /* Data buffer to store received data */ + UINT btr /* Byte count (must be multiple of 4) */ +) +{ + BYTE token; + + + Timer1 = 20; + do { /* Wait for data packet in timeout of 200ms */ + token = xchg_spi(0xFF); + } while ((token == 0xFF) && Timer1); + if (token != 0xFE) return 0; /* If not valid data token, retutn with error */ + + rcvr_spi_multi(buff, btr); /* Receive the data block into buffer */ + xchg_spi(0xFF); /* Discard CRC */ + xchg_spi(0xFF); + + return 1; /* Return with success */ +} + + + +/*-----------------------------------------------------------------------*/ +/* Send a data packet to MMC */ +/*-----------------------------------------------------------------------*/ + +#if _USE_WRITE +static +int xmit_datablock ( + const BYTE *buff, /* 512 byte data block to be transmitted */ + BYTE token /* Data/Stop token */ +) +{ + BYTE resp; + + + if (!wait_ready(500)) return 0; + + xchg_spi(token); /* Xmit data token */ + if (token != 0xFD) { /* Is data token */ + xmit_spi_multi(buff, 512); /* Xmit the data block to the MMC */ + xchg_spi(0xFF); /* CRC (Dummy) */ + xchg_spi(0xFF); + resp = xchg_spi(0xFF); /* Reveive data response */ + if ((resp & 0x1F) != 0x05) /* If not accepted, return with error */ + return 0; + } + + return 1; +} +#endif + + + +/*-----------------------------------------------------------------------*/ +/* Send a command packet to MMC */ +/*-----------------------------------------------------------------------*/ + +static +BYTE send_cmd ( /* Returns R1 resp (bit7==1:Send failed) */ + BYTE cmd, /* Command index */ + DWORD arg /* Argument */ +) +{ + BYTE n, res; + + + if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */ + cmd &= 0x7F; + res = send_cmd(CMD55, 0); + if (res > 1) return res; + } + + /* Select the card and wait for ready */ + deselect(); + if (!select()) return 0xFF; + + /* Send command packet */ + xchg_spi(0x40 | cmd); /* Start + Command index */ + xchg_spi((BYTE)(arg >> 24)); /* Argument[31..24] */ + xchg_spi((BYTE)(arg >> 16)); /* Argument[23..16] */ + xchg_spi((BYTE)(arg >> 8)); /* Argument[15..8] */ + xchg_spi((BYTE)arg); /* Argument[7..0] */ + n = 0x01; /* Dummy CRC + Stop */ + if (cmd == CMD0) n = 0x95; /* Valid CRC for CMD0(0) + Stop */ + if (cmd == CMD8) n = 0x87; /* Valid CRC for CMD8(0x1AA) Stop */ + xchg_spi(n); + + /* Receive command response */ + if (cmd == CMD12) xchg_spi(0xFF); /* Skip a stuff byte when stop reading */ + n = 10; /* Wait for a valid response in timeout of 10 attempts */ + do + res = xchg_spi(0xFF); + while ((res & 0x80) && --n); + + return res; /* Return with the response value */ +} + + + +/*-------------------------------------------------------------------------- + + Public Functions + +---------------------------------------------------------------------------*/ + + +/*-----------------------------------------------------------------------*/ +/* Initialize Disk Drive */ +/*-----------------------------------------------------------------------*/ + +DSTATUS disk_initialize ( + BYTE pdrv /* Physical drive nmuber (0) */ +) +{ + BYTE n, cmd, ty, ocr[4]; + + + if (pdrv) return STA_NOINIT; /* Supports only single drive */ + power_off(); /* Turn off the socket power to reset the card */ + if (Stat & STA_NODISK) return Stat; /* No card in the socket */ + power_on(); /* Turn on the socket power */ + FCLK_SLOW(); + for (n = 10; n; n--) xchg_spi(0xFF); /* 80 dummy clocks */ + + ty = 0; + if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */ + Timer1 = 100; /* Initialization timeout of 1000 msec */ + if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2? */ + for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF); /* 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(ACMD41, 1UL << 30)); /* Wait for leaving idle state (ACMD41 with HCS bit) */ + if (Timer1 && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */ + for (n = 0; n < 4; n++) ocr[n] = xchg_spi(0xFF); + ty = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* SDv2 */ + } + } + } else { /* SDv1 or MMCv3 */ + if (send_cmd(ACMD41, 0) <= 1) { + ty = CT_SD1; cmd = ACMD41; /* SDv1 */ + } else { + ty = CT_MMC; cmd = CMD1; /* MMCv3 */ + } + while (Timer1 && send_cmd(cmd, 0)); /* Wait for leaving idle state */ + if (!Timer1 || send_cmd(CMD16, 512) != 0) /* Set R/W block length to 512 */ + ty = 0; + } + } + CardType = ty; + deselect(); + + if (ty) { /* Initialization succeded */ + Stat &= ~STA_NOINIT; /* Clear STA_NOINIT */ + FCLK_FAST(); + } else { /* Initialization failed */ + power_off(); + } + + return Stat; +} + + + +/*-----------------------------------------------------------------------*/ +/* Get Disk Status */ +/*-----------------------------------------------------------------------*/ + +DSTATUS disk_status ( + BYTE pdrv /* Physical drive nmuber (0) */ +) +{ + if (pdrv) return STA_NOINIT; /* Supports only single drive */ + return Stat; +} + + + +/*-----------------------------------------------------------------------*/ +/* Read Sector(s) */ +/*-----------------------------------------------------------------------*/ + +DRESULT disk_read ( + BYTE pdrv, /* 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 (pdrv || !count) return RES_PARERR; + if (Stat & STA_NOINIT) return RES_NOTRDY; + + if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */ + + if (count == 1) { /* Single block read */ + if ((send_cmd(CMD17, sector) == 0) /* READ_SINGLE_BLOCK */ + && rcvr_datablock(buff, 512)) + count = 0; + } + else { /* Multiple block 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(); + + return count ? RES_ERROR : RES_OK; +} + + + +/*-----------------------------------------------------------------------*/ +/* Write Sector(s) */ +/*-----------------------------------------------------------------------*/ + +#if _USE_WRITE +DRESULT disk_write ( + BYTE pdrv, /* 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 (pdrv || !count) return RES_PARERR; + if (Stat & STA_NOINIT) return RES_NOTRDY; + if (Stat & STA_PROTECT) return RES_WRPRT; + + if (!(CardType & CT_BLOCK)) sector *= 512; /* Convert to byte address if needed */ + + if (count == 1) { /* Single block write */ + if ((send_cmd(CMD24, sector) == 0) /* WRITE_BLOCK */ + && xmit_datablock(buff, 0xFE)) + count = 0; + } + else { /* Multiple block write */ + if (CardType & CT_SDC) send_cmd(ACMD23, count); + 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(); + + return count ? RES_ERROR : RES_OK; +} +#endif + + +/*-----------------------------------------------------------------------*/ +/* Miscellaneous Functions */ +/*-----------------------------------------------------------------------*/ + +#if _USE_IOCTL +DRESULT disk_ioctl ( + BYTE pdrv, /* Physical drive nmuber (0) */ + BYTE cmd, /* Control code */ + void *buff /* Buffer to send/receive control data */ +) +{ + DRESULT res; + BYTE n, csd[16], *ptr = buff; + DWORD *dp, st, ed, csize; + + + if (pdrv) return RES_PARERR; + + res = RES_ERROR; + + if (cmd == CTRL_POWER) { + switch (ptr[0]) { + case 0: /* Sub control code (POWER_OFF) */ + power_off(); /* Power off */ + res = RES_OK; + break; + case 1: /* Sub control code (POWER_GET) */ + ptr[1] = (BYTE)power_status(); + res = RES_OK; + break; + default : + res = RES_PARERR; + } + } + else { + if (Stat & STA_NOINIT) return RES_NOTRDY; + + switch (cmd) { + case CTRL_SYNC : /* Make sure that no pending write process. Do not remove this or written sector might not left updated. */ + if (select()) res = RES_OK; + break; + + case GET_SECTOR_COUNT : /* Get number of sectors on the disk (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*/ + 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) { /* SDv2? */ + if (send_cmd(ACMD13, 0) == 0) { /* Read SD status */ + xchg_spi(0xFF); + if (rcvr_datablock(csd, 16)) { /* Read partial block */ + for (n = 64 - 16; n; n--) xchg_spi(0xFF); /* Purge trailing data */ + *(DWORD*)buff = 16UL << (csd[10] >> 4); + res = RES_OK; + } + } + } else { /* SDv1 or MMCv3 */ + if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) { /* Read CSD */ + if (CardType & CT_SD1) { /* SDv1 */ + *(DWORD*)buff = (((csd[10] & 63) << 1) + ((WORD)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1); + } else { /* MMCv3 */ + *(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(pdrv, 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; + + /* Following commands are never used by FatFs module */ + + case MMC_GET_TYPE : /* Get card type flags (1 byte) */ + *ptr = CardType; + res = RES_OK; + break; + + case MMC_GET_CSD : /* Receive CSD as a data block (16 bytes) */ + if (send_cmd(CMD9, 0) == 0 /* READ_CSD */ + && rcvr_datablock(ptr, 16)) + res = RES_OK; + break; + + case MMC_GET_CID : /* Receive CID as a data block (16 bytes) */ + if (send_cmd(CMD10, 0) == 0 /* READ_CID */ + && rcvr_datablock(ptr, 16)) + res = RES_OK; + break; + + case MMC_GET_OCR : /* Receive OCR as an R3 resp (4 bytes) */ + if (send_cmd(CMD58, 0) == 0) { /* READ_OCR */ + for (n = 4; n; n--) *ptr++ = xchg_spi(0xFF); + res = RES_OK; + } + break; + + case MMC_GET_SDSTAT : /* Receive SD statsu as a data block (64 bytes) */ + if (send_cmd(ACMD13, 0) == 0) { /* SD_STATUS */ + xchg_spi(0xFF); + if (rcvr_datablock(ptr, 64)) + res = RES_OK; + } + break; + + default: + res = RES_PARERR; + } + + deselect(); + } + + return res; +} +#endif + + +/*-----------------------------------------------------------------------*/ +/* Device Timer Interrupt Procedure */ +/*-----------------------------------------------------------------------*/ +/* This function must be called in period of 10ms */ +/* +void disk_timerproc (void) +{ + BYTE n, s; + + + n = Timer1; + if (n) Timer1 = --n; + n = Timer2; + if (n) Timer2 = --n; + + s = Stat; + s &= ~STA_PROTECT; + s &= ~STA_NODISK; + Stat = s; +} +*/
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