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elua/src/elua_mmc.c
Bogdan Marinescu 82eab855dd Style changes 
- remove stray printf
- use a consistent naming scheme for MMCFS_NUM_CARDS
2013-01-07 23:31:13 +02:00

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/*-----------------------------------------------------------------------*/
/* MMC/SDC (in SPI mode) control module (C)ChaN, 2007 */
/*-----------------------------------------------------------------------*/
// This file was modified from a sample available from the FatFs
// web site by Jesus Alvarez & James Snyder for eLua.
#include "platform_conf.h"
#if defined( BUILD_MMCFS ) && !defined( ELUA_SIMULATOR )
#include "platform.h"
#include "diskio.h"
#include "mmcfs.h"
#ifndef MMCFS_NUM_CARDS
#define NUM_CARDS 1
#else
#define NUM_CARDS MMCFS_NUM_CARDS
#endif
/* 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 */
#if !defined( MMCFS_SPI_NUM ) && !defined( MMCFS_SPI_NUM_ARRAY )
#error "MMC not supported on this board"
#endif
#if defined( MMCFS_CS_PORT )
const u8 mmcfs_cs_ports[ NUM_CARDS ] = { MMCFS_CS_PORT };
static const u8 mmcfs_cs_pins[ NUM_CARDS ] = { MMCFS_CS_PIN };
static const u8 mmcfs_spi_nums[ NUM_CARDS ] = { MMCFS_SPI_NUM };
#elif defined( MMCFS_CS_PORT_ARRAY )
const u8 mmcfs_cs_ports[ NUM_CARDS ] = MMCFS_CS_PORT_ARRAY;
static const u8 mmcfs_cs_pins[ NUM_CARDS ] = MMCFS_CS_PIN_ARRAY;
static const u8 mmcfs_spi_nums[ NUM_CARDS ] = MMCFS_SPI_NUM_ARRAY;
#endif
// asserts the CS pin to the card
static
void SELECT (BYTE id)
{
platform_pio_op( mmcfs_cs_ports[ id ] , ( ( u32 ) 1 << mmcfs_cs_pins[ id ] ), PLATFORM_IO_PIN_CLEAR );
}
// de-asserts the CS pin to the card
static
void DESELECT (BYTE id)
{
platform_pio_op( mmcfs_cs_ports[ id ], ( ( u32 ) 1 << mmcfs_cs_pins[ id ] ), PLATFORM_IO_PIN_SET );
}
/*--------------------------------------------------------------------------
Module Private Functions
---------------------------------------------------------------------------*/
static volatile DSTATUS Stat[ NUM_CARDS ]; /* Disk status */
static BYTE TriesLeft[ NUM_CARDS ];
static BYTE CardType[ NUM_CARDS ]; /* b0:MMC, b1:SDC, b2:Block addressing */
static BYTE PowerFlag[ NUM_CARDS ]; /* indicates if "power" is on */
/*-----------------------------------------------------------------------*/
/* Transmit a byte to MMC via SPI (Platform dependent) */
/*-----------------------------------------------------------------------*/
static
void xmit_spi (BYTE id, BYTE dat)
{
platform_spi_send_recv( mmcfs_spi_nums[ id ], dat );
}
/*-----------------------------------------------------------------------*/
/* Receive a byte from MMC via SPI (Platform dependent) */
/*-----------------------------------------------------------------------*/
static
BYTE rcvr_spi (BYTE id)
{
DWORD rcvdat;
rcvdat = platform_spi_send_recv( mmcfs_spi_nums[ id ], 0xFF );
return ( BYTE )rcvdat;
}
static
void rcvr_spi_m (BYTE id, BYTE *dst)
{
*dst = rcvr_spi( id );
}
/*-----------------------------------------------------------------------*/
/* Wait for card ready */
/*-----------------------------------------------------------------------*/
static
BYTE wait_ready (BYTE id)
{
BYTE res;
timer_data_type Timer2;
Timer2 = platform_timer_read( PLATFORM_TIMER_SYS_ID );
rcvr_spi( id );
do
res = rcvr_spi( id ); /* Wait for ready in timeout of 500ms. */
while ( ( res != 0xFF ) && ( platform_timer_get_diff_crt( PLATFORM_TIMER_SYS_ID, Timer2 ) < 500000 ) );
return res;
}
/*-----------------------------------------------------------------------*/
/* Send 80 or so clock transitions with CS and DI held high. This is */
/* required after card power up to get it into SPI mode */
/*-----------------------------------------------------------------------*/
static
void send_initial_clock_train(BYTE id)
{
unsigned int i;
/* Ensure CS is held high. */
DESELECT(id);
/* Send 10 bytes over the SSI. This causes the clock to wiggle the */
/* required number of times. */
for(i = 0 ; i < 10 ; i++)
rcvr_spi(id);
}
/*-----------------------------------------------------------------------*/
/* 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 (BYTE id)
{
/*
* This doesn't really turn the power on, but initializes the
* SSI port and pins needed to talk to the card.
*/
// Setup CS pin & deselect
platform_pio_op( mmcfs_cs_ports[ id ], ( ( u32 ) 1 << mmcfs_cs_pins[ id ] ), PLATFORM_IO_PIN_DIR_OUTPUT );
//platform_pio_op( MMCFS_CS_PORT, ( ( u32 ) 1 << MMCFS_CS_PIN ), PLATFORM_IO_PIN_PULLUP );
DESELECT( id );
// Setup SPI
platform_spi_setup( mmcfs_spi_nums[ id ], PLATFORM_SPI_MASTER, 400000, 0, 0, 8 );
/* Set DI and CS high and apply more than 74 pulses to SCLK for the card */
/* to be able to accept a native command. */
send_initial_clock_train(id);
PowerFlag[id] = 1;
}
// set the SSI speed to the max setting
static
void set_max_speed(BYTE id)
{
unsigned long i;
/* Set the maximum speed as half the system clock, with a max of 12.5 MHz. */
i = platform_cpu_get_frequency() / 2;
if(i > 12500000)
i = 12500000;
/* Configure the SPI port */
platform_spi_setup( mmcfs_spi_nums[ id ], PLATFORM_SPI_MASTER, i, 0, 0, 8 );
}
static
void power_off (BYTE id)
{
PowerFlag[ id ] = 0;
}
static
int chk_power(BYTE id) /* Socket power state: 0=off, 1=on */
{
return PowerFlag[ id ];
}
/*-----------------------------------------------------------------------*/
/* Receive a data packet from MMC */
/*-----------------------------------------------------------------------*/
static
BOOL rcvr_datablock (
BYTE id, /* Disk ID */
BYTE *buff, /* Data buffer to store received data */
UINT btr /* Byte count (must be even number) */
)
{
BYTE token;
timer_data_type Timer1;
Timer1 = platform_timer_read( PLATFORM_TIMER_SYS_ID );
do { /* Wait for data packet in timeout of 100ms */
token = rcvr_spi(id);
} while ( ( token == 0xFF ) &&
platform_timer_get_diff_crt( PLATFORM_TIMER_SYS_ID, Timer1 ) < 100000 );
if(token != 0xFE) return FALSE; /* If not valid data token, retutn with error */
do { /* Receive the data block into buffer */
rcvr_spi_m(id, buff++);
rcvr_spi_m(id, buff++);
} while (btr -= 2);
rcvr_spi(id); /* Discard CRC */
rcvr_spi(id);
return TRUE; /* Return with success */
}
/*-----------------------------------------------------------------------*/
/* Send a data packet to MMC */
/*-----------------------------------------------------------------------*/
#if _READONLY == 0
static
BOOL xmit_datablock (
BYTE id, /* Disk ID */
const BYTE *buff, /* 512 byte data block to be transmitted */
BYTE token /* Data/Stop token */
)
{
BYTE resp, wc;
if (wait_ready(id) != 0xFF) return FALSE;
xmit_spi(id,token); /* Xmit data token */
if (token != 0xFD) { /* Is data token */
wc = 0;
do { /* Xmit the 512 byte data block to MMC */
xmit_spi(id,*buff++);
xmit_spi(id,*buff++);
} while (--wc);
xmit_spi(id,0xFF); /* CRC (Dummy) */
xmit_spi(id,0xFF);
resp = rcvr_spi(id); /* 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 id, /* Disk ID */
BYTE cmd, /* Command byte */
DWORD arg /* Argument */
)
{
BYTE n, res;
if (wait_ready(id) != 0xFF) return 0xFF;
/* Send command packet */
xmit_spi(id,cmd); /* Command */
xmit_spi(id,(BYTE)(arg >> 24)); /* Argument[31..24] */
xmit_spi(id,(BYTE)(arg >> 16)); /* Argument[23..16] */
xmit_spi(id,(BYTE)(arg >> 8)); /* Argument[15..8] */
xmit_spi(id,(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(id,n);
/* Receive command response */
if (cmd == CMD12) rcvr_spi(id); /* Skip a stuff byte when stop reading */
n = 10; /* Wait for a valid response in timeout of 10 attempts */
do
res = rcvr_spi(id);
while ((res & 0x80) && --n);
return res; /* Return with the response value */
}
/*--------------------------------------------------------------------------
Public Functions
---------------------------------------------------------------------------*/
void elua_mmc_init()
{
int i;
for( i = 0; i < NUM_CARDS; i ++ )
{
Stat[ i ] = STA_NOINIT;
TriesLeft[ i ] = 2;
}
}
/*-----------------------------------------------------------------------*/
/* Initialize Disk Drive */
/*-----------------------------------------------------------------------*/
DSTATUS disk_initialize (
BYTE drv /* Physical drive nmuber (0) */
)
{
BYTE n, ty, ocr[4];
timer_data_type Timer1;
if (Stat[drv] & STA_NODISK) return Stat[drv]; /* No card in the socket */
do
{
power_on(drv); /* Force socket power on */
SELECT(drv); /* CS = L */
ty = 0;
if (send_cmd(drv,CMD0, 0) == 1) { /* Enter Idle state */
Timer1 = platform_timer_read( PLATFORM_TIMER_SYS_ID );
if (send_cmd(drv,CMD8, 0x1AA) == 1) { /* SDC Ver2+ */
for (n = 0; n < 4; n++) ocr[n] = rcvr_spi(drv);
if (ocr[2] == 0x01 && ocr[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
do {
if (send_cmd(drv,CMD55, 0) <= 1 && send_cmd(drv,CMD41, 1UL << 30) == 0) break; /* ACMD41 with HCS bit */
} while ( platform_timer_get_diff_crt( PLATFORM_TIMER_SYS_ID, Timer1 ) < 1000000 );
if ( ( platform_timer_get_diff_crt( PLATFORM_TIMER_SYS_ID, Timer1 ) < 1000000 )
&& send_cmd(drv,CMD58, 0) == 0) { /* Check CCS bit (it seems pointless to check the timer here*/
for (n = 0; n < 4; n++) ocr[n] = rcvr_spi(drv);
ty = (ocr[0] & 0x40) ? 6 : 2;
}
}
} else { /* SDC Ver1 or MMC */
ty = (send_cmd(drv,CMD55, 0) <= 1 && send_cmd(drv,CMD41, 0) <= 1) ? 2 : 1; /* SDC : MMC */
do {
if (ty == 2) {
if (send_cmd(drv,CMD55, 0) <= 1 && send_cmd(drv,CMD41, 0) == 0) break; /* ACMD41 */
} else {
if (send_cmd(drv,CMD1, 0) == 0) break; /* CMD1 */
}
} while ( platform_timer_get_diff_crt( PLATFORM_TIMER_SYS_ID, Timer1 ) < 1000000 );
if ( ( platform_timer_get_diff_crt( PLATFORM_TIMER_SYS_ID, Timer1 ) >= 1000000 )
|| send_cmd(drv,CMD16, 512) != 0 ) /* Select R/W block length */
ty = 0;
}
}
CardType[drv] = ty;
DESELECT(drv); /* CS = H */
rcvr_spi(drv); /* Idle (Release DO) */
if (TriesLeft[drv])
TriesLeft[drv]--;
if (ty) { /* Initialization succeded */
Stat[drv] &= ~STA_NOINIT; /* Clear STA_NOINIT */
set_max_speed(drv);
} else { /* Initialization failed */
power_off(drv);
}
} while( TriesLeft[drv] > 0 && ty == 0 );
return Stat[drv];
}
/*-----------------------------------------------------------------------*/
/* Get Disk Status */
/*-----------------------------------------------------------------------*/
DSTATUS disk_status (
BYTE drv /* Physical drive nmuber (0) */
)
{
return Stat[drv];
}
/*-----------------------------------------------------------------------*/
/* 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 (!count) return RES_PARERR;
if (Stat[drv] & STA_NOINIT) return RES_NOTRDY;
if (!(CardType[drv] & 4)) sector *= 512; /* Convert to byte address if needed */
SELECT(drv); /* CS = L */
if (count == 1) { /* Single block read */
if ((send_cmd(drv,CMD17, sector) == 0) /* READ_SINGLE_BLOCK */
&& rcvr_datablock(drv,buff, 512))
count = 0;
}
else { /* Multiple block read */
if (send_cmd(drv,CMD18, sector) == 0) { /* READ_MULTIPLE_BLOCK */
do {
if (!rcvr_datablock(drv,buff, 512)) break;
buff += 512;
} while (--count);
send_cmd(drv,CMD12, 0); /* STOP_TRANSMISSION */
}
}
DESELECT(drv); /* CS = H */
rcvr_spi(drv); /* 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 (!count) return RES_PARERR;
if (Stat[drv] & STA_NOINIT) return RES_NOTRDY;
if (Stat[drv] & STA_PROTECT) return RES_WRPRT;
if (!(CardType[drv] & 4)) sector *= 512; /* Convert to byte address if needed */
SELECT(drv); /* CS = L */
if (count == 1) { /* Single block write */
if ((send_cmd(drv, CMD24, sector) == 0) /* WRITE_BLOCK */
&& xmit_datablock(drv, buff, 0xFE))
count = 0;
}
else { /* Multiple block write */
if (CardType[drv] & 2) {
send_cmd(drv, CMD55, 0); send_cmd(drv, CMD23, count); /* ACMD23 */
}
if (send_cmd(drv, CMD25, sector) == 0) { /* WRITE_MULTIPLE_BLOCK */
do {
if (!xmit_datablock(drv, buff, 0xFC)) break;
buff += 512;
} while (--count);
if (!xmit_datablock(drv, 0, 0xFD)) /* STOP_TRAN token */
count = 1;
}
}
DESELECT(drv); /* CS = H */
rcvr_spi(drv); /* 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 control data */
)
{
DRESULT res;
BYTE n, csd[16], *ptr = buff;
WORD csize;
res = RES_ERROR;
if (ctrl == CTRL_POWER) {
switch (*ptr) {
case 0: /* Sub control code == 0 (POWER_OFF) */
if (chk_power(drv))
power_off(drv); /* Power off */
res = RES_OK;
break;
case 1: /* Sub control code == 1 (POWER_ON) */
power_on(drv); /* Power on */
res = RES_OK;
break;
case 2: /* Sub control code == 2 (POWER_GET) */
*(ptr+1) = (BYTE)chk_power(drv);
res = RES_OK;
break;
default :
res = RES_PARERR;
}
}
else {
if (Stat[drv] & STA_NOINIT) return RES_NOTRDY;
SELECT(drv); /* CS = L */
switch (ctrl) {
case GET_SECTOR_COUNT : /* Get number of sectors on the disk (DWORD) */
if ((send_cmd(drv,CMD9, 0) == 0) && rcvr_datablock(drv,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(drv) == 0xFF)
res = RES_OK;
break;
case MMC_GET_CSD : /* Receive CSD as a data block (16 bytes) */
if (send_cmd(drv,CMD9, 0) == 0 /* READ_CSD */
&& rcvr_datablock(drv, ptr, 16))
res = RES_OK;
break;
case MMC_GET_CID : /* Receive CID as a data block (16 bytes) */
if (send_cmd(drv, CMD10, 0) == 0 /* READ_CID */
&& rcvr_datablock(drv, ptr, 16))
res = RES_OK;
break;
case MMC_GET_OCR : /* Receive OCR as an R3 resp (4 bytes) */
if (send_cmd(drv, CMD58, 0) == 0) { /* READ_OCR */
for (n = 0; n < 4; n++)
*ptr++ = rcvr_spi(drv);
res = RES_OK;
}
// case MMC_GET_TYPE : /* Get card type flags (1 byte) */
// *ptr = CardType;
// res = RES_OK;
// break;
default:
res = RES_PARERR;
}
DESELECT(drv); /* CS = H */
rcvr_spi(drv); /* Idle (Release DO) */
}
return res;
}
/*---------------------------------------------------------*/
/* User Provided Timer Function for FatFs module */
/*---------------------------------------------------------*/
/* This is a real time clock service to be called from */
/* FatFs module. Any valid time must be returned even if */
/* the system does not support a real time clock. */
DWORD get_fattime (void)
{
return ((2007UL-1980) << 25) // Year = 2007
| (6UL << 21) // Month = June
| (5UL << 16) // Day = 5
| (11U << 11) // Hour = 11
| (38U << 5) // Min = 38
| (0U >> 1) // Sec = 0
;
}
#endif // #if defined( BUILD_MMCFS ) && !defined( ELUA_SIMULATOR )
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