Get card-specific data
#include <hw/dcmd_sim_mmcsd.h> #define DCMD_MMCSD_GET_CSD __DIOTF(_DCMD_CAM, _SIM_MMCSD + 2, struct _mmcsd_csd)
| Argument | Value |
|---|---|
| filedes | A file descriptor that you obtained by opening the device |
| dcmd | DCMD_MMCSD_GET_CSD |
| dev_data_ptr | A pointer to a MMCSD_CSD structure (see below) |
| n_bytes | sizeof(MMCSD_CSD) |
| dev_info_ptr | NULL |
This command gets card-specific data.
None.
A filled-in MMCSD_CSD structure:
typedef struct _mmc_csd_ext {
uint32_t hs_max_dtr;
uint32_t sectors;
uint8_t erase_grp_def;
uint8_t hc_erase_group_size;
uint8_t hc_wp_grp_size;
uint8_t user_wp;
} MMC_CSD_EXT;
typedef struct _mmcsd_csd {
uint32_t flags;
uint8_t rsvd[4];
union {
struct {
uint8_t csd_structure; /* CSD structure */
uint8_t taac;
uint8_t nsac;
uint8_t tran_speed;
uint16_t ccc;
uint8_t read_bl_len;
uint8_t read_bl_partial;
uint8_t write_blk_misalign;
uint8_t read_blk_misalign;
uint8_t dsr_imp;
union {
struct {
uint16_t c_size;
uint8_t vdd_r_curr_min;
uint8_t vdd_r_curr_max;
uint8_t vdd_w_curr_min;
uint8_t vdd_w_curr_max;
uint8_t c_size_mult;
} csd_ver1;
struct {
uint32_t c_size;
} csd_ver2;
}csd;
uint8_t erase_blk_en;
uint8_t sector_size;
uint8_t wp_grp_size;
uint8_t wp_grp_enable;
uint8_t r2w_factor;
uint8_t write_bl_len;
uint8_t write_bl_partial;
uint8_t file_format_grp;
uint8_t copy;
uint8_t perm_write_protect;
uint8_t tmp_write_protect;
uint8_t file_format;
} sd_csd;
struct {
uint8_t csd_structure; /* CSD structure */
uint8_t mmc_prot;
uint8_t taac;
uint8_t nsac;
uint8_t tran_speed;
uint16_t ccc;
uint8_t read_bl_len;
uint8_t read_bl_partial;
uint8_t write_blk_misalign;
uint8_t read_blk_misalign;
uint8_t dsr_imp;
uint16_t c_size;
uint8_t vdd_r_curr_min;
uint8_t vdd_r_curr_max;
uint8_t vdd_w_curr_min;
uint8_t vdd_w_curr_max;
uint8_t c_size_mult;
union {
struct { /* MMC system specification version 3.1 */
uint8_t erase_grp_size;
uint8_t erase_grp_mult;
} mmc_v31;
struct { /* MMC system specification version 2.2 */
uint8_t sector_size;
uint8_t erase_grp_size;
} mmc_v22;
} erase;
MMC_CSD_EXT ext_csd;
uint8_t wp_grp_size;
uint8_t wp_grp_enable;
uint8_t r2w_factor;
uint8_t write_bl_len;
uint8_t write_bl_partial;
/* uint8_t file_format_grp; */
uint8_t copy;
uint8_t perm_write_protect;
uint8_t tmp_write_protect;
uint8_t ecc;
} mmc_csd;
} csd;
pid_t pid; /* Store PID of driver process for this device */
uint8_t csd_version; /* CSD structure version */
uint8_t mmcprot_version; /* MMC proto version */
uint8_t type; /* card type, MMC or SD for now */
} MMCSD_CSD;
devctl() in the QNX Neutrino C Library Reference