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fatfs_nios2_de1_pio.c
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fatfs_nios2_de1_pio.c
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/****************************************************************************
* Copyright (C) 2012 by Michael Fischer.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
****************************************************************************
* History:
*
* 23.08.2012 mifi First version, tested with an Altera DE1 board.
****************************************************************************/
#define __FATFS_NIOS2_DE1_PIO_C__
#if (FFS_SUPPORT_HW_NIOS2_DE1_PIO >= 1)
/*=========================================================================*/
/* Includes */
/*=========================================================================*/
#include <system.h>
#include <io.h>
/*=========================================================================*/
/* DEFINE: All Structures and Common Constants */
/*=========================================================================*/
/*
* Simple SPI (pio) defines
*/
#define ADDR_DATA 0
#define ADDR_SET 1
#define ADDR_CLR 2
#define SPI_CS_PIN 1
#define SPI_SCK_PIN 2
#define SPI_MOSI_PIN 4
#define SPI_MISO_PIN 1
#define SELECT() IOWR(PIO_SPI_0_BASE, ADDR_CLR, SPI_CS_PIN) /* MMC CS = L */
#define DESELECT() IOWR(PIO_SPI_0_BASE, ADDR_SET, SPI_CS_PIN) /* MMC CS = H */
#define SCK_HIGH() IOWR(PIO_SPI_0_BASE, ADDR_SET, SPI_SCK_PIN)
#define SCK_LOW() IOWR(PIO_SPI_0_BASE, ADDR_CLR, SPI_SCK_PIN)
#define MOSI_HIGH() IOWR(PIO_SPI_0_BASE, ADDR_SET, SPI_MOSI_PIN)
#define MOSI_LOW() IOWR(PIO_SPI_0_BASE, ADDR_CLR, SPI_MOSI_PIN)
#define GET_MISO() IORD(PIO_SPI_0_BASE, ADDR_DATA)
#define NOP() asm("nop")
#define POWER_ON()
#define POWER_OFF()
/*=========================================================================*/
/* DEFINE: Prototypes */
/*=========================================================================*/
/*=========================================================================*/
/* DEFINE: Definition of all local Data */
/*=========================================================================*/
/*=========================================================================*/
/* DEFINE: Definition of all local Procedures */
/*=========================================================================*/
/***************************************************************************/
/* SetLowSpeed */
/* */
/* In : none */
/* Out : none */
/* Return: none */
/***************************************************************************/
static void SetLowSpeed(void)
{
/* Do nothing here, spi with pio is slow */
} /* SetLowSpeed */
/***************************************************************************/
/* SetHighSpeed */
/* */
/* In : none */
/* Out : none */
/* Return: none */
/***************************************************************************/
static void SetHighSpeed(void)
{
/* Do nothing here, spi with pio can not speed up */
} /* SetHighSpeed */
/***************************************************************************/
/* InitDiskIOHardware */
/* */
/* Here the diskio interface is initialise, in this case the PIO-SPI. */
/* */
/* In : none */
/* Out : none */
/* Return: none */
/***************************************************************************/
static void InitDiskIOHardware(void)
{
/* Deselct before to prevent glitch */
DESELECT();
SCK_LOW();
MOSI_LOW();
SetLowSpeed();
} /* InitDiskIOHardware */
/***************************************************************************/
/* Here comes some macros to speed up the transfer performance. */
/* */
/* Be careful if you port this part to an other CPU. */
/* !!! This part is high platform dependent. !!! */
/***************************************************************************/
/*
* Transmit data only, without to store the receive data.
* This function will be used normally to send an U8.
*/
#define TRANSMIT_U8(_dat) if (_dat & 0x80) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x40) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x20) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x10) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x08) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x04) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x02) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x01) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW();
/*
* The next function transmit the data "very fast", becasue
* we do not need to take care of receive data. This function
* will be used to transmit data in 16 bit mode.
*/
#define TRANSMIT_FAST(_dat) if (_dat & 0x8000) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x4000) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x2000) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x1000) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0800) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0400) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0200) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0100) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0080) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0040) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0020) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0010) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0008) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0004) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0002) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW(); \
if (_dat & 0x0001) MOSI_HIGH(); else MOSI_LOW(); \
SCK_HIGH(); SCK_LOW();
/*
* RECEIVE_FAST will be used in ReceiveDatablock only.
*/
#define RECEIVE_FAST(_buff,_dest) _buff = 0; \
MOSI_HIGH(); \
if (GET_MISO()) _buff |= 0x8000; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x4000; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x2000; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x1000; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0800; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0400; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0200; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0100; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0080; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0040; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0020; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0010; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0008; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0004; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0002; \
SCK_HIGH(); \
SCK_LOW(); \
if (GET_MISO()) _buff |= 0x0001; \
SCK_HIGH(); \
SCK_LOW(); \
*_dest++ = (_buff >> 8) & 0xFF; \
*_dest++ = _buff & 0xFF;
/***************************************************************************/
/* ReceiveU8 */
/* */
/* Send a dummy value to the SPI bus and receive the data. */
/* */
/* In : none */
/* Out : none */
/* Return: Data */
/***************************************************************************/
static FFS_U8 ReceiveU8 (void)
{
FFS_U8 value = 0;
MOSI_HIGH(); /* Dummy value */
if (GET_MISO()) value |= 0x80;
SCK_HIGH();
SCK_LOW();
if (GET_MISO()) value |= 0x40;
SCK_HIGH();
SCK_LOW();
if (GET_MISO()) value |= 0x20;
SCK_HIGH();
SCK_LOW();
if (GET_MISO()) value |= 0x10;
SCK_HIGH();
SCK_LOW();
if (GET_MISO()) value |= 0x08;
SCK_HIGH();
SCK_LOW();
if (GET_MISO()) value |= 0x04;
SCK_HIGH();
SCK_LOW();
if (GET_MISO()) value |= 0x02;
SCK_HIGH();
SCK_LOW();
if (GET_MISO()) value |= 0x01;
SCK_HIGH();
SCK_LOW();
return(value);
} /* ReceiveU8 */
/***************************************************************************/
/* ReceiveDatablock */
/* */
/* Receive a data packet from MMC/SD card. Number of "btr" bytes will be */
/* store in the given buffer "buff". The byte count "btr" must be */
/* a multiple of 4. */
/* */
/* In : buff, btr */
/* Out : none */
/* Return: In case of an error return FALSE */
/***************************************************************************/
static int ReceiveDatablock(FFS_U8 * buff, uint32_t btr)
{
FFS_U8 token;
volatile FFS_U16 value;
Timer1 = 10;
do /* Wait for data packet in timeout of 100ms */
{
token = ReceiveU8();
}
while ((token == 0xFF) && Timer1);
if (token != 0xFE)
return(FFS_FALSE); /* If not valid data token, return with error */
do /* Receive the data block into buffer */
{
RECEIVE_FAST(value, buff);
RECEIVE_FAST(value, buff);
}
while (btr -= 4);
ReceiveU8(); /* Discard CRC */
ReceiveU8();
return(FFS_TRUE); /* Return with success */
} /* ReceiveDatablock */
#if (_READONLY == 0)
/***************************************************************************/
/* TransmitDatablock */
/* */
/* Send a block of 512 bytes to the MMC/SD card. */
/* */
/* In : buff, token (Data/Stop token) */
/* Out : none */
/* Return: In case of an error return FALSE */
/***************************************************************************/
static int TransmitDatablock(const FFS_U8 * buff, FFS_U8 token)
{
FFS_U8 resp, wc = 0;
if (WaitReady() != 0xFF)
return(FFS_FALSE);
TRANSMIT_U8(token); /* Xmit data token */
if (token != 0xFD) /* Is data token */
{
do /* Send the 512 byte data block */
{
TRANSMIT_FAST(((*buff << 8) | *(buff + 1)));
buff += 2;
}
while (--wc);
TRANSMIT_FAST(0xFFFF); /* CRC (Dummy) */
resp = ReceiveU8(); /* Reveive data response */
if ((resp & 0x1F) != 0x05) /* If not accepted, return with error */
{
return(FFS_FALSE);
}
}
return(FFS_TRUE); /* Return with success */
} /* TransmitDatablock */
#endif /* _READONLY */
/***************************************************************************/
/* GetCDWP */
/* */
/* Return the status of the CD and WP socket pin. */
/* */
/* In : none */
/* Out : none */
/* Return: Data */
/***************************************************************************/
static FFS_U32 GetCDWP(void)
{
FFS_U32 value = 0;
/*
* CD and Wp is not supported by the Altera DE1 board.
*/
return(value);
} /* GetCDWP */
#endif /* (FFS_SUPPORT_HW_NIOS2_DE1_PIO >= 1) */
/*** EOF ***/