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mbed-os/components/storage/blockdevice/COMPONENT_SD/SDBlockDevice.h

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/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MBED_SD_BLOCK_DEVICE_H
#define MBED_SD_BLOCK_DEVICE_H
/* If the target has no SPI support then SDCard is not supported */
#ifdef DEVICE_SPI
#include "BlockDevice.h"
#include "drivers/SPI.h"
#include "drivers/Timer.h"
#include "drivers/MbedCRC.h"
#include "drivers/DigitalOut.h"
#include "platform/platform.h"
#include "platform/PlatformMutex.h"
/** SDBlockDevice class
*
* Access an SD Card using SPI
*/
class SDBlockDevice : public mbed::BlockDevice {
public:
/** Lifetime of an SD card
*/
SDBlockDevice(PinName mosi, PinName miso, PinName sclk, PinName cs, uint64_t hz = 1000000, bool crc_on = 0);
virtual ~SDBlockDevice();
/** Initialize a block device
*
* @return 0 on success or a negative error code on failure
*/
virtual int init();
/** Deinitialize a block device
*
* @return 0 on success or a negative error code on failure
*/
virtual int deinit();
/** Read blocks from a block device
*
* @param buffer Buffer to write blocks to
* @param addr Address of block to begin reading from
* @param size Size to read in bytes, must be a multiple of read block size
* @return 0 on success, negative error code on failure
*/
virtual int read(void *buffer, mbed::bd_addr_t addr, mbed::bd_size_t size);
/** Program blocks to a block device
*
* The blocks must have been erased prior to being programmed
*
* @param buffer Buffer of data to write to blocks
* @param addr Address of block to begin writing to
* @param size Size to write in bytes, must be a multiple of program block size
* @return 0 on success, negative error code on failure
*/
virtual int program(const void *buffer, mbed::bd_addr_t addr, mbed::bd_size_t size);
/** Mark blocks as no longer in use
*
* This function provides a hint to the underlying block device that a region of blocks
* is no longer in use and may be erased without side effects. Erase must still be called
* before programming, but trimming allows flash-translation-layers to schedule erases when
* the device is not busy.
*
* @param addr Address of block to mark as unused
* @param size Size to mark as unused in bytes, must be a multiple of erase block size
* @return 0 on success, negative error code on failure
*/
virtual int trim(mbed::bd_addr_t addr, mbed::bd_size_t size);
/** Get the size of a readable block
*
* @return Size of a readable block in bytes
*/
virtual mbed::bd_size_t get_read_size() const;
/** Get the size of a programable block
*
* @return Size of a programable block in bytes
* @note Must be a multiple of the read size
*/
virtual mbed::bd_size_t get_program_size() const;
/** Get the total size of the underlying device
*
* @return Size of the underlying device in bytes
*/
virtual mbed::bd_size_t size() const;
/** Enable or disable debugging
*
* @param dbg State of debugging
*/
virtual void debug(bool dbg);
/** Set the transfer frequency
*
* @param freq Transfer frequency
* @note Max frequency supported is 25MHZ
*/
virtual int frequency(uint64_t freq);
private:
/* Commands : Listed below are commands supported
* in SPI mode for SD card : Only Mandatory ones
*/
enum cmdSupported {
CMD_NOT_SUPPORTED = -1, /**< Command not supported error */
CMD0_GO_IDLE_STATE = 0, /**< Resets the SD Memory Card */
CMD1_SEND_OP_COND = 1, /**< Sends host capacity support */
CMD6_SWITCH_FUNC = 6, /**< Check and Switches card function */
CMD8_SEND_IF_COND = 8, /**< Supply voltage info */
CMD9_SEND_CSD = 9, /**< Provides Card Specific data */
CMD10_SEND_CID = 10, /**< Provides Card Identification */
CMD12_STOP_TRANSMISSION = 12, /**< Forces the card to stop transmission */
CMD13_SEND_STATUS = 13, /**< Card responds with status */
CMD16_SET_BLOCKLEN = 16, /**< Length for SC card is set */
CMD17_READ_SINGLE_BLOCK = 17, /**< Read single block of data */
CMD18_READ_MULTIPLE_BLOCK = 18, /**< Card transfers data blocks to host until interrupted
by a STOP_TRANSMISSION command */
CMD24_WRITE_BLOCK = 24, /**< Write single block of data */
CMD25_WRITE_MULTIPLE_BLOCK = 25, /**< Continuously writes blocks of data until
'Stop Tran' token is sent */
CMD27_PROGRAM_CSD = 27, /**< Programming bits of CSD */
CMD32_ERASE_WR_BLK_START_ADDR = 32, /**< Sets the address of the first write
block to be erased. */
CMD33_ERASE_WR_BLK_END_ADDR = 33, /**< Sets the address of the last write
block of the continuous range to be erased.*/
CMD38_ERASE = 38, /**< Erases all previously selected write blocks */
CMD55_APP_CMD = 55, /**< Extend to Applications specific commands */
CMD56_GEN_CMD = 56, /**< General Purpose Command */
CMD58_READ_OCR = 58, /**< Read OCR register of card */
CMD59_CRC_ON_OFF = 59, /**< Turns the CRC option on or off*/
// App Commands
ACMD6_SET_BUS_WIDTH = 6,
ACMD13_SD_STATUS = 13,
ACMD22_SEND_NUM_WR_BLOCKS = 22,
ACMD23_SET_WR_BLK_ERASE_COUNT = 23,
ACMD41_SD_SEND_OP_COND = 41,
ACMD42_SET_CLR_CARD_DETECT = 42,
ACMD51_SEND_SCR = 51,
};
uint8_t _card_type;
int _cmd(SDBlockDevice::cmdSupported cmd, uint32_t arg, bool isAcmd = 0, uint32_t *resp = NULL);
int _cmd8();
/* Move the SDCard into the SPI Mode idle state
*
* The card is transitioned from SDCard mode to SPI mode by sending the
* CMD0 (GO_IDLE_STATE) command with CS asserted. See the notes in the
* "SPI Startup" section of the comments at the head of the
* implementation file for further details and specification references.
*
* @return Response form the card. R1_IDLE_STATE (0x1), the successful
* response from CMD0. R1_XXX_XXX for more response
*/
uint32_t _go_idle_state();
int _initialise_card();
mbed::bd_size_t _sectors;
mbed::bd_size_t _sd_sectors();
bool _is_valid_trim(mbed::bd_addr_t addr, mbed::bd_size_t size);
/* SPI functions */
mbed::Timer _spi_timer; /**< Timer Class object used for busy wait */
uint32_t _init_sck; /**< Intial SPI frequency */
uint32_t _transfer_sck; /**< SPI frequency during data transfer/after initialization */
mbed::SPI _spi; /**< SPI Class object */
/* SPI initialization function */
void _spi_init();
uint8_t _cmd_spi(SDBlockDevice::cmdSupported cmd, uint32_t arg);
void _spi_wait(uint8_t count);
bool _wait_token(uint8_t token); /**< Wait for token */
bool _wait_ready(uint16_t ms = 300); /**< 300ms default wait for card to be ready */
int _read(uint8_t *buffer, uint32_t length);
int _read_bytes(uint8_t *buffer, uint32_t length);
uint8_t _write(const uint8_t *buffer, uint8_t token, uint32_t length);
int _freq(void);
/* Chip Select and SPI mode select */
mbed::DigitalOut _cs;
void _select();
void _deselect();
virtual void lock()
{
_mutex.lock();
}
virtual void unlock()
{
_mutex.unlock();
}
PlatformMutex _mutex;
static const uint32_t _block_size;
uint32_t _erase_size;
bool _is_initialized;
bool _dbg;
uint32_t _init_ref_count;
#if MBED_CONF_SD_CRC_ENABLED
bool _crc_on;
mbed::MbedCRC<POLY_7BIT_SD, 7> _crc7;
mbed::MbedCRC<POLY_16BIT_CCITT, 16> _crc16;
#endif
};
#endif /* DEVICE_SPI */
#endif /* MBED_SD_BLOCK_DEVICE_H */
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