sd_mem.h

sd卡的高速读写程序

#define SD_R3_RESERVED_LENGTH1	6	/* bits */
#define SD_R3_REG_LENGTH	32	/* bits */
#define SD_R3_RESERVED_LENGTH2	7	/* bits */
#define SD_R3_START_BIT		0x0
#define SD_R3_END_BIT		0x1
#define SD_R3_CARD_XMIT_BIT	0x0

/* Response, R6 format (RCA register)..
 * [start[47]|xmit[46]|index[45:40]|RCA[39:24]|stat[23:8]|crc[7:1]|end[0]]
 */
#define SD_R6_LENGTH		48	/* bits */
#define SD_R6_INDEX_LENGTH	6	/* bits */
#define SD_R6_RCA_LENGTH	16	/* bits */
#define SD_R6_STATUS_LENGTH	16	/* bits */
#define SD_R6_CRC_LENGTH	7	/* bits */
#define SD_R6_START_BIT		0x0
#define SD_R6_END_BIT		0x1
#define SD_R6_CARD_XMIT_BIT	0x0


/**************************************************************************
 * SD structures 
 **************************************************************************/
typedef struct { /* ref. p.49-52..SD Physical Layer */
    unsigned out_of_range	:1;
    unsigned addr_error		:1;
    unsigned block_len_error	:1;
    unsigned erase_seq_error	:1;
    unsigned erase_param	:1;
    unsigned wp_violation	:1;
    unsigned card_locked	:1;
    unsigned lock_failed	:1;
    unsigned com_crc_error	:1;
    unsigned illegal_cmd	:1;
    unsigned ecc_failed		:1;
    unsigned cc_error		:1;
    unsigned error		:1;
    unsigned reserved_18_17	:2;
    unsigned cid_csd_overwr	:1;
    unsigned wp_erase_skip	:1;
    unsigned ecc_disable	:1;
    unsigned erase_reset	:1;
    unsigned current_state	:4;
    unsigned ready_for_data	:1;
    unsigned reserved_7_6	:2;
    unsigned app_cmd		:1;
    unsigned reserved_4		:1;
    unsigned ake_seq_error	:1;
    unsigned reserved_2_0	:3;
} SD_CARD_STATUS;

typedef struct { /* ref. p.52-53..SD Physical Layer */
    unsigned dat_bus_width	:2;    
    unsigned secured_mode	:1;
    unsigned reserved_508_496	:13;
    unsigned sd_card_type	:16;

    unsigned protected_size	:32;

#if 0 /* only 64 of 512 bits used */
    unsigned reserved_447_312	:136; /* illustrative..not for compile! */
    unsigned reserved_311_0	:312; /* illustrative..not for compile! */
#endif
} SD_STATUS;

typedef struct { /* ref. p.61..SD Physical Layer */
    unsigned card_ready		:1;
    unsigned reserved_30_24	:7;
    unsigned vdd35_36		:1;
    unsigned vdd34_35		:1;
    unsigned vdd33_34		:1;
    unsigned vdd32_33		:1;
    unsigned vdd31_32		:1;
    unsigned vdd30_31		:1;
    unsigned vdd29_30		:1;
    unsigned vdd28_29		:1;
    unsigned vdd27_28		:1;
    unsigned vdd26_27		:1;
    unsigned vdd25_26		:1;
    unsigned vdd24_25		:1;
    unsigned vdd23_24		:1;
    unsigned vdd22_23		:1;
    unsigned vdd21_22		:1;
    unsigned vdd20_21		:1;
    unsigned vdd19_20		:1;
    unsigned vdd18_19		:1;
    unsigned vdd17_18		:1;
    unsigned vdd16_17		:1;
    unsigned reserved_3_0	:4;
} SD_OCR;

typedef struct { /* ref. p.62-63..SD Physical Layer */
    unsigned mid		:8;
    unsigned oid_15_8		:8; /* oid[1] ascii..2B */
    unsigned oid_7_0		:8; /* oid[0] ascii */
    unsigned pnm_39_32		:8; /* pnm[4] ascii..5B */

    unsigned pnm_31_24		:8; /* pnm[3] ascii */ 
    unsigned pnm_23_16		:8; /* pnm[2] ascii */  
    unsigned pnm_15_8		:8; /* pnm[1] ascii */  
    unsigned pnm_7_0		:8; /* pnm[0] ascii */  

    unsigned prv		:8; /* BCD */
    unsigned psn_31_8		:24; /* psn crossed DW boundary */

    unsigned psn_7_0		:8; /* psn crossed DW boundary */
    unsigned reserved_23_20	:4;
    unsigned mdt		:12;/* [y[11:4] | m[3:0]]..y: 0->2000; m: 1->January */
    unsigned crc		:7;
    unsigned reserved_0		:1;    
} SD_CID;

typedef struct { /* ref. p.63-71..SD Physical Layer */
    unsigned version		:2; 
    unsigned reserved_125_119	:7; 
    unsigned taac_value		:4; /* ref. p.65 */ 
    unsigned taac_unit		:3; /* ref. p.65 */ 
    unsigned nsac		:8; /* N*100 clock cycles */
    unsigned reserved_103	:1; 
    unsigned tran_spd_value	:4; /* ref. p.65 */ 
    unsigned tran_spd_unit	:3; /* ref. p.65 */ 

    unsigned ccc		:12; /* supported command classes */
    unsigned rd_blk_len		:4;
    unsigned rd_blk_len_partial	:1;
    unsigned wr_blk_misalign	:1;
    unsigned rd_blk_misalign	:1;
    unsigned dsr_imp		:1;
    unsigned reserved_75_74	:2;
    unsigned c_size_11_2	:10; /* c_size crossed DW boundary */

    unsigned c_size_1_0		:2; /* c_size crossed DW boundary */
    unsigned vdd_r_curr_min	:3;
    unsigned vdd_r_curr_max	:3;
    unsigned vdd_w_curr_min	:3;
    unsigned vdd_w_curr_max	:3;
    unsigned c_size_mult	:3;
    unsigned erase_blk_en	:1;
    unsigned sector_size	:7;
    unsigned wp_grp_size	:7;

    unsigned wp_grp_enable	:1;
    unsigned reserved_30_29	:2;
    unsigned r2w_factor		:3;
    unsigned wr_blk_len		:4;
    unsigned wr_blk_partial	:1;
    unsigned reserved_20_16	:5;
    unsigned file_format_grp	:1;
    unsigned copy		:1;
    unsigned perm_wr_protect	:1;
    unsigned tmp_wr_protect	:1;
    unsigned file_format	:2;
    unsigned reserved_9_8	:2;
    unsigned crc		:7;
    unsigned reserved_0		:1;
} SD_CSD;

typedef struct { /* ref. p.72-73..SD Physical Layer */
    unsigned scr_struct		:4;
    unsigned sd_spec		:4;
    unsigned dat_stat_aft_erase	:1;
    unsigned sd_security	:3;
    unsigned sd_bus_widths	:4;
    unsigned reserved_47_32	:16;

#if 0 /* use 32 of 64 bits */
    unsigned reserved_31_0	:32; 
#endif
} SD_SCR;

typedef struct { 
    unsigned com_state		:4; /* value <= 0xf */
    unsigned response_recv	:1;
    unsigned response_expected	:3;
    unsigned cmd		:8;
    unsigned cur_blk_size	:4; /* size = 2^value (bytes) */ 
    unsigned data_width		:1; /* 0:1bit, 1:4bits*/
    unsigned use_data		:2; /* 1:write, 2:read, 0:no data */
    unsigned cmd_sent 		:1; /* 1:cmd completed */ 
    unsigned retry_cnt		:8;

    uint wait_nclk;
    uint arg;
    uint data_cnt;
    uint data_len;             /* length to be xmited in bytes */
    uint *rd_dest_ptr;
    int  *wr_src_ptr;
    int result;               /* 0: success, -1: failed */
#if SD_CHECK_RECV_CRC
    uint crc7_err_cnt;
    uint crc16_err_cnt;
#endif
} SD_XMIT_STATUS;

typedef struct { 
    uchar cmd;
    uint  arg;
} SD_CMD_Q;

typedef struct { 
    uchar type;
    uchar inserted;
    uint n_wr_max; /* min: 2 clk cycles */
    uint n_ac_max; /* min: 2 clk cycles */
    uint capacity; /* in Bytes */
} SD_CINFO;


/**************************************************************************
 * Public SD variables
 **************************************************************************/
EXPORT SD_CINFO SD_card_info;
EXPORT SD_XMIT_STATUS SD_xmit_info;

/**************************************************************************
 * Public SD functions
 **************************************************************************/
EXPORT void SD_service(void);
EXPORT int SD_identify_device(void);
EXPORT void SD_init(void);
EXPORT void SD_enable_io(int);
EXPORT void SD_reset(void);
EXPORT int SD_set_bus_width(int);
EXPORT int SD_read_blk(int, int, uint *, int);
EXPORT int SD_read_nblk(int, int, uint *, int);
EXPORT int SD_send_cmd(int, uint, int);
EXPORT int SD_send_acmd(int, uint, int);
EXPORT int SD_clk_restricted_cmd(int, uint);
EXPORT int SD_get_next_cmd(void);
EXPORT unsigned int SD_boot_setup(void);
EXPORT int SD_read_sector_lba(short *, int, int, int);

#endif /*  _SD_MEM_H_ */