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mmc.c
Package: glg2.zip [view]
Upload User: zcw0111
Upload Date: 2021-05-17
Package Size: 48k
Code Size: 13k
Category:
3G develop
Development Platform:
C/C++
- /*-----------------------------------------------------------------------*/
- /* MMC/SDC (in SPI mode) control module (C)ChaN, 2006 */
- /*-----------------------------------------------------------------------*/
- /* Only rcvr_spi(), xmit_spi(), disk_timerproc(), disk_initialize () and */
- /* some macros are platform dependent. */
- /*-----------------------------------------------------------------------*/
- #include <avr/io.h>
- #include "diskio.h"
- /* Definitions for MMC/SDC command */
- #define CMD0 (0x40+0) /* GO_IDLE_STATE */
- #define CMD1 (0x40+1) /* SEND_OP_COND */
- #define CMD8 (0x40+8) /* SEND_IF_COND */
- #define CMD9 (0x40+9) /* SEND_CSD */
- #define CMD10 (0x40+10) /* SEND_CID */
- #define CMD12 (0x40+12) /* STOP_TRANSMISSION */
- #define CMD16 (0x40+16) /* SET_BLOCKLEN */
- #define CMD17 (0x40+17) /* READ_SINGLE_BLOCK */
- #define CMD18 (0x40+18) /* READ_MULTIPLE_BLOCK */
- #define CMD23 (0x40+23) /* SET_BLOCK_COUNT */
- #define CMD24 (0x40+24) /* WRITE_BLOCK */
- #define CMD25 (0x40+25) /* WRITE_MULTIPLE_BLOCK */
- #define CMD41 (0x40+41) /* SEND_OP_COND (ACMD) */
- #define CMD55 (0x40+55) /* APP_CMD */
- #define CMD58 (0x40+58) /* READ_OCR */
- /* Control signals (Platform dependent) */
- #define SELECT() PORTB &= ~_BV(2) /* MMC CS = L */
- #define DESELECT() PORTB |= _BV(2) /* MMC CS = H */
- extern volatile
- BYTE MmcTmr[2]; /* 100Hz decrement timers */
- /*--------------------------------------------------------------------------
- Module Private Functions
- ---------------------------------------------------------------------------*/
- static volatile
- DSTATUS Stat; /* Disk status */
- static
- BYTE CardType; /* b0:MMC, b1:SDC, b2:Block addressing */
- /*-----------------------------------------------------------------------*/
- /* Transmit a byte to MMC via SPI (Platform dependent) */
- /*-----------------------------------------------------------------------*/
- #define xmit_spi(dat) SPDR=(dat); loop_until_bit_is_set(SPSR,SPIF)
- /*-----------------------------------------------------------------------*/
- /* Receive a byte from MMC via SPI (Platform dependent) */
- /*-----------------------------------------------------------------------*/
- static
- BYTE rcvr_spi (void)
- {
- SPDR = 0xFF;
- loop_until_bit_is_set(SPSR, SPIF);
- return SPDR;
- }
- /* Alternative macro to receive data fast */
- #define rcvr_spi_m(dst) SPDR=0xFF; loop_until_bit_is_set(SPSR,SPIF); *(dst)=SPDR
- /*-----------------------------------------------------------------------*/
- /* Wait for card ready */
- /*-----------------------------------------------------------------------*/
- static
- BYTE wait_ready (void)
- {
- BYTE res;
- MmcTmr[1] = 50; /* Wait for ready in timeout of 500ms */
- rcvr_spi();
- do
- res = rcvr_spi();
- while ((res != 0xFF) && MmcTmr[1]);
- return res;
- }
- /*-----------------------------------------------------------------------*/
- /* Receive a data packet from MMC */
- /*-----------------------------------------------------------------------*/
- static
- BOOL rcvr_datablock (
- BYTE *buff, /* Data buffer to store received data */
- UINT btr /* Byte count (must be even number) */
- )
- {
- BYTE token;
- MmcTmr[0] = 10;
- do { /* Wait for data packet in timeout of 100ms */
- token = rcvr_spi();
- } while ((token == 0xFF) && MmcTmr[0]);
- if(token != 0xFE) return FALSE; /* If not valid data token, retutn with error */
- do { /* Receive the data block into buffer */
- rcvr_spi_m(buff++);
- rcvr_spi_m(buff++);
- } while (btr -= 2);
- rcvr_spi(); /* Discard CRC */
- rcvr_spi();
- return TRUE; /* Return with success */
- }
- /*-----------------------------------------------------------------------*/
- /* Send a data packet to MMC */
- /*-----------------------------------------------------------------------*/
- #if _READONLY == 0
- static
- BOOL xmit_datablock (
- const BYTE *buff, /* 512 byte data block to be transmitted */
- BYTE token /* Data/Stop token */
- )
- {
- BYTE resp, wc;
- if (wait_ready() != 0xFF) return FALSE;
- xmit_spi(token); /* Xmit data token */
- if (token != 0xFD) { /* Is data token */
- wc = 0;
- do { /* Xmit the 512 byte data block to MMC */
- xmit_spi(*buff++);
- xmit_spi(*buff++);
- } while (--wc);
- xmit_spi(0xFF); /* CRC (Dummy) */
- xmit_spi(0xFF);
- resp = rcvr_spi(); /* Reveive data response */
- if ((resp & 0x1F) != 0x05) /* If not accepted, return with error */
- return FALSE;
- }
- return TRUE;
- }
- #endif /* _READONLY */
- /*-----------------------------------------------------------------------*/
- /* Send a command packet to MMC */
- /*-----------------------------------------------------------------------*/
- static
- BYTE send_cmd (
- BYTE cmd, /* Command byte */
- DWORD arg /* Argument */
- )
- {
- BYTE n, res;
- if (wait_ready() != 0xFF) return 0xFF;
- /* Send command packet */
- xmit_spi(cmd); /* Command */
- xmit_spi((BYTE)(arg >> 24)); /* Argument[31..24] */
- xmit_spi((BYTE)(arg >> 16)); /* Argument[23..16] */
- xmit_spi((BYTE)(arg >> 8)); /* Argument[15..8] */
- xmit_spi((BYTE)arg); /* Argument[7..0] */
- n = 0;
- if (cmd == CMD0) n = 0x95; /* CRC for CMD0(0) */
- if (cmd == CMD8) n = 0x87; /* CRC for CMD8(0x1AA) */
- xmit_spi(n);
- /* Receive command response */
- if (cmd == CMD12) 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, ty, ocr[4];
- if (drv) return STA_NOINIT; /* Supports only single drive */
- for (n = 10; n; n--) rcvr_spi(); /* 80 dummy clocks */
- SELECT(); /* CS = L */
- ty = 0;
- if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
- MmcTmr[0] = 100; /* Initialization timeout of 1000 msec */
- if (send_cmd(CMD8, 0x1AA) == 1) { /* SDC Ver2+ */
- for (n = 0; n < 4; n++) ocr[n] = rcvr_spi();
- if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
- do {
- if (send_cmd(CMD55, 0) <= 1 && send_cmd(CMD41, 1UL << 30) == 0) break; /* ACMD41 with HCS bit */
- } while (MmcTmr[0]);
- if (MmcTmr[0] && send_cmd(CMD58, 0) == 0) { /* Check CCS bit */
- for (n = 0; n < 4; n++) ocr[n] = rcvr_spi();
- ty = (ocr[0] & 0x40) ? 6 : 2;
- }
- }
- } else { /* SDC Ver1 or MMC */
- ty = (send_cmd(CMD55, 0) <= 1 && send_cmd(CMD41, 0) <= 1) ? 2 : 1; /* SDC : MMC */
- do {
- if (ty == 2) {
- if (send_cmd(CMD55, 0) <= 1 && send_cmd(CMD41, 0) == 0) break; /* ACMD41 */
- } else {
- if (send_cmd(CMD1, 0) == 0) break; /* CMD1 */
- }
- } while (MmcTmr[0]);
- if (!MmcTmr[0] || send_cmd(CMD16, 512) != 0) /* Select R/W block length */
- ty = 0;
- }
- }
- CardType = ty;
- DESELECT(); /* CS = H */
- rcvr_spi(); /* Idle (Release DO) */
- if (ty) { /* Initialization succeded */
- Stat &= ~STA_NOINIT; /* Clear STA_NOINIT */
- } else { /* Initialization failed */
- Stat |= STA_NOINIT; /* Set STA_NOINIT */
- }
- return Stat;
- }
- /*-----------------------------------------------------------------------*/
- /* Get Disk Status */
- /*-----------------------------------------------------------------------*/
- DSTATUS disk_status (
- BYTE drv /* Physical drive nmuber (0) */
- )
- {
- if (drv) return STA_NOINIT; /* 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 & STA_NOINIT) return RES_NOTRDY;
- if (!(CardType & 4)) sector *= 512; /* Convert to byte address if needed */
- SELECT(); /* CS = L */
- 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(); /* CS = H */
- rcvr_spi(); /* Idle (Release DO) */
- return count ? RES_ERROR : RES_OK;
- }
- /*-----------------------------------------------------------------------*/
- /* Write Sector(s) */
- /*-----------------------------------------------------------------------*/
- #if _READONLY == 0
- 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 & STA_NOINIT) return RES_NOTRDY;
- if (Stat & STA_PROTECT) return RES_WRPRT;
- if (!(CardType & 4)) sector *= 512; /* Convert to byte address if needed */
- SELECT(); /* CS = L */
- 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 & 2) {
- send_cmd(CMD55, 0); send_cmd(CMD23, count); /* ACMD23 */
- }
- 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(); /* CS = H */
- rcvr_spi(); /* Idle (Release DO) */
- return count ? RES_ERROR : RES_OK;
- }
- #endif /* _READONLY */
- /*-----------------------------------------------------------------------*/
- /* Miscellaneous Functions */
- /*-----------------------------------------------------------------------*/
- DRESULT disk_ioctl (
- BYTE drv, /* Physical drive nmuber (0) */
- BYTE ctrl, /* Control code */
- void *buff /* Buffer to send/receive data block */
- )
- {
- DRESULT res;
- BYTE n, csd[16], *ptr = buff;
- WORD csize;
- if (drv) return RES_PARERR;
- SELECT(); /* CS = L */
- res = RES_ERROR;
- switch (ctrl) {
- 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) + 1;
- *(DWORD*)buff = (DWORD)csize << 10;
- } else { /* MMC or SDC ver 1.XX */
- 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 GET_SECTOR_SIZE : /* Get sectors on the disk (WORD) */
- *(WORD*)buff = 512;
- res = RES_OK;
- break;
- case CTRL_SYNC : /* Make sure that data has been written */
- if (wait_ready() == 0xFF)
- res = RES_OK;
- break;
- case MMC_GET_CSD : /* Receive CSD as a data block (16 bytes) */
- if (Stat & STA_NOINIT) return RES_NOTRDY;
- 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 (Stat & STA_NOINIT) return RES_NOTRDY;
- 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 (Stat & STA_NOINIT) return RES_NOTRDY;
- if (send_cmd(CMD58, 0) == 0) { /* READ_OCR */
- for (n = 0; n < 4; n++)
- *ptr++ = rcvr_spi();
- res = RES_OK;
- }
- break;
- default:
- res = RES_PARERR;
- }
- DESELECT(); /* CS = H */
- rcvr_spi(); /* Idle (Release DO) */
- return res;
- }
- /*---------------------------------------*/
- /* Device timer interrupt procedure */
- /* This must be called in period of 10ms */
- /* (Platform dependent) */
- void disk_timerproc (void)
- {
- BYTE n;
- n = MmcTmr[0]; /* 100Hz decrement timer */
- if (n) MmcTmr[0] = --n;
- n = MmcTmr[1];
- if (n) MmcTmr[1] = --n;
- }