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OpenModem/hardware/sdcard/diskio.c

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/*-----------------------------------------------------------------------*/
/* 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 <avr/io.h>
#include <stdbool.h>
#include "diskio.h"
#include "device.h"
#include "hardware/LED.h"
/* Port controls (Platform dependent) */
#define CS_LOW() SD_CS_PORT &= ~(_BV(SD_CS_PIN)) /* CS=low */
#define CS_HIGH() SD_CS_PORT |= _BV(SD_CS_PIN) /* CS=high */
#define MMC_CD ((SD_DETECT_INPUT & _BV(SD_DETECT_PIN))) /* Card detected. yes:true, no:false, default:true */
#define MMC_WP (false) /* Write protected. yes:true, no:false, default:false */
#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 BYTE CardType; /* Card type flags */
static volatile BYTE Timer1, Timer2; /* 100Hz decrement timer */
/*-----------------------------------------------------------------------*/
/* 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
void power_on (void)
{
SPI_DDR |= _BV(SPI_MOSI) | _BV(SPI_CLK);
SPI_DDR &= ~(_BV(SPI_MISO));
SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR0);
}
static
void power_off (void)
{
SPCR = 0; /* Disable SPI function */
}
/*-----------------------------------------------------------------------*/
/* 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);
while(!(SPSR & (1<<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 (must be multiple of 2) */
)
{
do {
SPDR = *p++; while(!(SPSR & (1<<SPIF)));//loop_until_bit_is_set(SPSR,SPIF);
SPDR = *p++; while(!(SPSR & (1<<SPIF)));//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 (must be multiple of 2) */
)
{
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(); /* Set 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(); /* Set CS# low */
xchg_spi(0xFF); /* Dummy clock (force DO enabled) */
if (wait_ready(500)) return 1; /* Wait for card ready */
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 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 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) */
UINT count /* Sector count (1..128) */
)
{
BYTE cmd;
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 */
cmd = count > 1 ? CMD18 : CMD17; /* READ_MULTIPLE_BLOCK : READ_SINGLE_BLOCK */
if (send_cmd(cmd, sector) == 0) {
do {
if (!rcvr_datablock(buff, 512)) break;
buff += 512;
} while (--count);
if (cmd == CMD18) 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)) /* 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 csize;
if (pdrv) return RES_PARERR;
res = RES_ERROR;
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;
/* 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;
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 Interrupt Procedure */
/*-----------------------------------------------------------------------*/
/* This function must be called in period of 10ms */
void disk_timerproc(void) {
BYTE n, s;
n = Timer1; /* 100Hz decrement timer */
if (n) Timer1 = --n;
n = Timer2;
if (n) Timer2 = --n;
s = Stat;
if (MMC_WP) /* Write protected */
s |= STA_PROTECT;
else /* Write enabled */
s &= ~STA_PROTECT;
if (MMC_CD) {
s &= ~STA_NODISK; /* Card inserted */
} else {
s |= (STA_NODISK | STA_NOINIT); /* Socket empty */
}
Stat = s; /* Update MMC status */
}
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