A first try to write a block device wrapper for the BSP_DISCO_F746NG. I can read and write blocks, but I haven't gotten it to work with FATFileSystem yet.

I'm trying to get Block Device to work with the DISCO_F746NG boards built in SD-card-reader using the BSP_DISCO_F746NG library.

I used the HeapBlockDevice as template, and I have gotten read and program to work when I just try to read or program one block and read it back, but I haven't gotten FATFileSystem to work with this class yet. I'm kind of stuck here right now, so any help would be very much appreciated!

BD_DISCO_F746NG.h

Committer:
Lightsource
Date:
2017-12-14
Revision:
0:3f8692709f00

File content as of revision 0:3f8692709f00:

#include "BlockDevice.h"
#include "stm32746g_discovery_sd.h"
#include "mbed.h"


class BD_DISCO_F746NG : public BlockDevice
{
public:
    BD_DISCO_F746NG(bd_size_t block=512);
    /** Lifetime of the memory block device
     *
     * @param size      Size of the Block Device in bytes
     * @param read      Minimum read size required in bytes
     * @param program   Minimum program size required in bytes
     * @param erase     Minimum erase size required in bytes
     */
    BD_DISCO_F746NG(bd_size_t read, bd_size_t program, bd_size_t erase);
    virtual ~BD_DISCO_F746NG();

    /** 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 read blocks into
     *  @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, bd_addr_t addr, 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, bd_addr_t addr, bd_size_t size);

    /** Erase blocks on a block device
     *
     *  The state of an erased block is undefined until it has been programmed
     *
     *  @param addr     Address of block to begin erasing
     *  @param size     Size to erase in bytes, must be a multiple of erase block size
     *  @return         0 on success, negative error code on failure
     */
    virtual int erase(bd_addr_t addr, bd_size_t size);

    /** Get the size of a readable block
     *
     *  @return         Size of a readable block in bytes
     */
    virtual bd_size_t get_read_size() const;

    /** Get the size of a programable block
     *
     *  @return         Size of a programable block in bytes
     */
    virtual bd_size_t get_program_size() const;

    /** Get the size of a eraseable block
     *
     *  @return         Size of a eraseable block in bytes
     */
    virtual bd_size_t get_erase_size() const;

    /** Get the total size of the underlying device
     *
     *  @return         Size of the underlying device in bytes
     */
    virtual bd_size_t size() const;

private:
    uint32_t Timeout; 
    bd_size_t _read_size;
    bd_size_t _program_size;
    bd_size_t _erase_size;
    bd_size_t _count;
    bd_size_t _blocksize;
    bd_size_t _size;
    BSP_SD_CardInfo _currentCardInfo;
    uint8_t _SD_state;
    uint8_t **_blocks;
};