hi , i am interfacing sd card with Pic24 suing fatfs libray but i am not going to initialize my card . i tried many waysbut still.
the code attavhed below
which one i found in FatFs example for PIC24,
please go through it and suggest me mistake and share your experience .
#SPI2
thanking you.
the code attavhed below
Code:
/*------------------------------------------------------------------------/
/ MMCv3/SDv1/SDv2+ (in SPI mode) control module
/-------------------------------------------------------------------------/
/
/ Copyright (C) 2014, ChaN, all right reserved.
/
/ * This software is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/ personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
/ * Redistributions of source code must retain the above copyright notice.
/
/-------------------------------------------------------------------------*/
#include <p24FJ128GA010.h>
#include "diskio.h"
/* Socket controls (Platform dependent) */
#define CS_LOW() _LATG9 = 0 /* MMC CS = L */
#define CS_HIGH() _LATG9 = 1 /* MMC CS = H */
#define MMC_CD (1) /* Card detected (yes:true, no:false, default:true) */
#define MMC_WP (0) /* Write protected (yes:true, no:false, default:false) */
/* SPI bit rate controls */
#define FCLK_SLOW() SPI2STATbits.SPIEN = 0;SPI2CON1bits.PPRE=0b01;SPI2CON1bits.SPRE=0b110;SPI2STATbits.SPIEN = 0; /* Set slow clock for card initialization (100k-400k) */
#define FCLK_FAST() SPI2STATbits.SPIEN = 0;SPI2CON1bits.PPRE=0b01;SPI2CON1bits.SPRE=0b110;SPI2STATbits.SPIEN = 0; /* Set fast clock for generic read/write */
/*--------------------------------------------------------------------------
Module Private Functions
---------------------------------------------------------------------------*/
/* Definitions for MMC/SDC command */
#define CMD0 (0) /* GO_IDLE_STATE */
#define CMD1 (1) /* SEND_OP_COND */
#define ACMD41 (41|0x80) /* 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 (13|0x80) /* 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 */
#define ACMD23 (23|0x80) /* SET_WR_BLK_ERASE_COUNT (SDC) */
#define CMD24 (24) /* WRITE_BLOCK */
#define CMD25 (25) /* WRITE_MULTIPLE_BLOCK */
#define CMD41 (41) /* SEND_OP_COND (ACMD) */
#define CMD55 (55) /* APP_CMD */
#define CMD58 (58) /* READ_OCR */
static volatile
DSTATUS Stat = STA_NOINIT; /* Disk status */
static volatile
UINT Timer1, Timer2; /* 1000Hz decrement timer */
static
UINT CardType;
/*-----------------------------------------------------------------------*/
/* Interface Controls (Platform dependent) */
/*-----------------------------------------------------------------------*/
/* When the target system does not support socket power control, there */
/* is nothing to do in these functions. */
static
void power_on(void)
{
; /* Turn socket power on, delay >1ms (Nothing to do) */
SPI2CON1 = 0x013B; /* Enable SPI1 */
SPI2CON2 = 0x0000;
SPI2STATbits.SPIEN = 1;
//_RB15 = 1;
}
static
void power_off (void)
{
SPI2STATbits.SPIEN = 0; /* Disable SPI1 */
; /* Turn socket power off (Nothing to do) */
}
/*-----------------------------------------------------------------------*/
/* SPI Transactions (Platform dependent) */
/*-----------------------------------------------------------------------*/
/* Single byte SPI transaction */
static
BYTE xchg_spi (BYTE dat)
{
SPI2BUF = dat; /* Initiate an SPI transaction */
while (!SPI2STATbits.SPIRBF) ; /* Wait for end of the SPI transaction */
return (BYTE)SPI2BUF; /* Get received byte */
}
/* Multi-byte SPI transaction (transmit) */
static
void xmit_spi_multi (
const BYTE* buff, /* Data to be sent */
UINT cnt /* Number of bytes to send */
)
{
do {
SPI2BUF = *buff++; /* Initiate an SPI transaction */
while (!SPI2STATbits.SPIRBF) ; /* Wait for end of the SPI transaction */
SPI2BUF; /* Discard received byte */
SPI1BUF = *buff++;
while (!SPI2STATbits.SPIRBF) ;
SPI2BUF;
} while (cnt -= 2);
}
/* Multi-byte SPI transaction (receive) */
static
void rcvr_spi_multi (
BYTE* buff, /* Buffer to store received data */
UINT cnt /* Number of bytes to receive */
)
{
do {
SPI2BUF = 0xFF; /* Initiate an SPI transaction */
while (!SPI2STATbits.SPIRBF) ; /* Wait for end of the SPI transaction */
*buff++ = SPI2BUF; /* Get received byte */
SPI2BUF = 0xFF;
while (!SPI2STATbits.SPIRBF) ;
*buff++ = SPI2BUF;
} while (cnt -= 2);
}
/*-----------------------------------------------------------------------*/
/* Wait for card ready */
/*-----------------------------------------------------------------------*/
static
int wait_ready (void)
{
BYTE d;
Timer2 = 500; /* Wait for ready in timeout of 500ms */
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(); /* Set CS# high */
xchg_spi(0xFF); /* Dummy clock (force DO hi-z for multiple slave SPI) */
}
/*-----------------------------------------------------------------------*/
/* Select the card and wait ready */
/*-----------------------------------------------------------------------*/
static
int select (void) /* 1:Successful, 0:Timeout */
{
CS_LOW(); /* Set CS# low */
xchg_spi(0xFF); /* Dummy clock (force DO enabled) */
if (wait_ready()) return 1; /* Wait for card ready */
deselect();
return 0; /* Timeout */
}
/*-----------------------------------------------------------------------*/
/* Receive a data packet from MMC */
/*-----------------------------------------------------------------------*/
static
int rcvr_datablock ( /* 1:OK, 0:Failed */
BYTE *buff, /* Data buffer to store received data */
UINT btr /* Byte count (must be multiple of 4) */
)
{
BYTE token;
Timer1 = 100;
do { /* Wait for data packet in timeout of 100ms */
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 ( /* 1:OK, 0:Failed */
const BYTE *buff, /* 512 byte data block to be transmitted */
BYTE token /* Data token */
)
{
BYTE resp;
if (!wait_ready()) return 0;
xchg_spi(token); /* Xmit a token */
if (token != 0xFD) { /* Not StopTran 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); /* Receive a data response */
if ((resp & 0x1F) != 0x05) return 0; /* If not accepted, return with error */
}
return 1;
}
#endif
/*-----------------------------------------------------------------------*/
/* 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(CMD55, 0);
if (res > 1) return res;
}
/* Select the card and wait for ready except to stop multiple block read */
if (cmd != CMD12) {
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 on stop to read */
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
---------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------*/
/* Get Disk Status */
/*-----------------------------------------------------------------------*/
DSTATUS disk_status (
BYTE pdrv /* Physical drive nmuber (0) */
)
{
if (pdrv != 0) return STA_NOINIT; /* Supports only single drive */
return Stat;
}
/*-----------------------------------------------------------------------*/
/* Initialize Disk Drive */
/*-----------------------------------------------------------------------*/
DSTATUS disk_initialize (
BYTE pdrv /* Physical drive nmuber (0) */
)
{
BYTE n, cmd, ty, ocr[4];
if (pdrv != 0) return STA_NOINIT; /* Supports only single drive */
if (Stat & STA_NODISK) return Stat; /* No card in the socket */
power_on(); /* Initialize memory card interface */
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 = 1000; /* 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, 0x40000000)); /* 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) ty = 0; /* Set read/write block length to 512 */
}
}
CardType = ty;
deselect();
if (ty) { /* Function succeded */
Stat &= ~STA_NOINIT; /* Clear STA_NOINIT */
FCLK_FAST();
} else { /* Function failed */
power_off(); /* Deinitialize interface */
}
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) */
UINT count /* Sector count (1..128) */
)
{
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) */
UINT count /* Sector count (1..128) */
)
{
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)) count = 1; /* STOP_TRAN token */
}
}
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 data block */
)
{
DRESULT res;
BYTE n, csd[16], *ptr = buff;
DWORD csz;
if (pdrv) return RES_PARERR;
if (Stat & STA_NOINIT) return RES_NOTRDY;
res = RES_ERROR;
switch (cmd) {
case CTRL_SYNC : /* Flush write-back cache, Wait for end of internal process */
if (select()) res = RES_OK;
break;
case GET_SECTOR_COUNT : /* Get number of sectors on the disk (WORD) */
if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
if ((csd[0] >> 6) == 1) { /* SDv2? */
csz = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
*(DWORD*)buff = csz << 10;
} else { /* SDv1 or MMCv3 */
n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
csz = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
*(DWORD*)buff = csz << (n - 9);
}
res = RES_OK;
}
break;
case GET_BLOCK_SIZE : /* Get erase block size in unit of sectors (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 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(buff, 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(buff, 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 = 0; n < 4; n++)
*((BYTE*)buff+n) = xchg_spi(0xFF);
res = RES_OK;
}
break;
case MMC_GET_SDSTAT : /* Receive SD statsu as a data block (64 bytes) */
if ((CardType & CT_SD2) && send_cmd(ACMD13, 0) == 0) { /* SD_STATUS */
xchg_spi(0xFF);
if (rcvr_datablock(buff, 64)) res = RES_OK;
}
break;
case CTRL_POWER_OFF : /* Power off */
power_off();
Stat |= STA_NOINIT;
res = RES_OK;
break;
default:
res = RES_PARERR;
}
deselect();
return res;
}
#endif
/*-----------------------------------------------------------------------*/
/* Device Timer Driven Procedure */
/*-----------------------------------------------------------------------*/
/* This function must be called by timer interrupt in period of 1ms */
void disk_timerproc (void)
{
BYTE s;
UINT n;
n = Timer1; /* 1000Hz decrement timer with zero stopped */
if (n) Timer1 = --n;
n = Timer2;
if (n) Timer2 = --n;
/* Update socket status */
s = Stat;
if (MMC_WP) {
s |= STA_PROTECT;
} else {
s &= ~STA_PROTECT;
}
if (MMC_CD) {
s &= ~STA_NODISK;
} else {
s |= (STA_NODISK | STA_NOINIT);
}
Stat = s;
}please go through it and suggest me mistake and share your experience .
#SPI2
thanking you.
