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SD_CSD_INFO_ts Struct Reference

Decoded contents of the SD card CSD register. More...

Public Attributes

uint32_t capacity_bytes
uint32_t capacity_mb
uint16_t block_len
uint32_t block_count
uint8_t tran_speed
uint16_t ccc
uint8_t csd_structure
struct { 
   uint16_t   c_size 
   uint8_t   c_size_mult 
   uint8_t   read_bl_len 
} v1
struct { 
   uint32_t   c_size 
} v2
uint8_t taac
uint8_t nsac
uint8_t read_bl_partial
uint8_t write_blk_misalign
uint8_t read_blk_misalign
uint8_t dsr_imp
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
uint8_t wp_upc
uint8_t crc

Detailed Description

Decoded contents of the SD card CSD register.

Populated by decode_csd_v1 or decode_csd_v2 and used to extract capacity, block size, and block count, which are then stored in the sd_handle_s for use by read/write and FatFs ioctl calls.

Definition at line 163 of file sd.c.

Member Data Documentation

◆ capacity_bytes

uint32_t SD_CSD_INFO_ts::capacity_bytes

Total card capacity in bytes.

Definition at line 164 of file sd.c.

◆ capacity_mb

uint32_t SD_CSD_INFO_ts::capacity_mb

Total card capacity in megabytes.

Definition at line 165 of file sd.c.

◆ block_len

uint16_t SD_CSD_INFO_ts::block_len

Read/write block length in bytes.

Definition at line 166 of file sd.c.

◆ block_count

uint32_t SD_CSD_INFO_ts::block_count

Total number of blocks on the card.

Definition at line 167 of file sd.c.

◆ tran_speed

uint8_t SD_CSD_INFO_ts::tran_speed

Maximum data transfer speed encoded value.

Definition at line 168 of file sd.c.

◆ ccc

uint16_t SD_CSD_INFO_ts::ccc

Card command classes bitmask.

Definition at line 169 of file sd.c.

◆ csd_structure

uint8_t SD_CSD_INFO_ts::csd_structure

CSD structure version: 0 = v1.0, 1 = v2.0.

Definition at line 170 of file sd.c.

◆ c_size [1/2]

uint16_t SD_CSD_INFO_ts::c_size

Device size (12-bit). Used to compute block count.

Definition at line 174 of file sd.c.

◆ c_size_mult

uint8_t SD_CSD_INFO_ts::c_size_mult

Device size multiplier (3-bit).

Definition at line 175 of file sd.c.

◆ read_bl_len

uint8_t SD_CSD_INFO_ts::read_bl_len

Maximum read block length exponent.

Definition at line 176 of file sd.c.

◆ [struct]

struct { ... } SD_CSD_INFO_ts::v1

CSD v1.0 specific fields (SDSC cards).

◆ c_size [2/2]

uint32_t SD_CSD_INFO_ts::c_size

Device size (22-bit). Capacity = (c_size + 1) × 512 KB.

Definition at line 181 of file sd.c.

◆ [struct]

struct { ... } SD_CSD_INFO_ts::v2

CSD v2.0 specific fields (SDHC/SDXC cards).

◆ taac

uint8_t SD_CSD_INFO_ts::taac

Time-dependent part of data access time.

Definition at line 184 of file sd.c.

◆ nsac

uint8_t SD_CSD_INFO_ts::nsac

Clock-dependent part of data access time (in clock cycles × 100).

Definition at line 185 of file sd.c.

◆ read_bl_partial

uint8_t SD_CSD_INFO_ts::read_bl_partial

Partial blocks allowed for read (1 = yes).

Definition at line 186 of file sd.c.

◆ write_blk_misalign

uint8_t SD_CSD_INFO_ts::write_blk_misalign

Write block misalignment allowed (1 = yes).

Definition at line 187 of file sd.c.

◆ read_blk_misalign

uint8_t SD_CSD_INFO_ts::read_blk_misalign

Read block misalignment allowed (1 = yes).

Definition at line 188 of file sd.c.

◆ dsr_imp

uint8_t SD_CSD_INFO_ts::dsr_imp

Configurable driver stage implemented (1 = yes).

Definition at line 189 of file sd.c.

◆ erase_blk_en

uint8_t SD_CSD_INFO_ts::erase_blk_en

Erase single block enabled (1 = yes).

Definition at line 190 of file sd.c.

◆ sector_size

uint8_t SD_CSD_INFO_ts::sector_size

Erasable sector size in blocks minus 1.

Definition at line 191 of file sd.c.

◆ wp_grp_size

uint8_t SD_CSD_INFO_ts::wp_grp_size

Write-protect group size in erasable sectors minus 1.

Definition at line 192 of file sd.c.

◆ wp_grp_enable

uint8_t SD_CSD_INFO_ts::wp_grp_enable

Write-protect group enable (1 = yes).

Definition at line 193 of file sd.c.

◆ r2w_factor

uint8_t SD_CSD_INFO_ts::r2w_factor

Write speed factor relative to read speed.

Definition at line 194 of file sd.c.

◆ write_bl_len

uint8_t SD_CSD_INFO_ts::write_bl_len

Maximum write block length exponent.

Definition at line 195 of file sd.c.

◆ write_bl_partial

uint8_t SD_CSD_INFO_ts::write_bl_partial

Partial blocks allowed for write (1 = yes).

Definition at line 196 of file sd.c.

◆ file_format_grp

uint8_t SD_CSD_INFO_ts::file_format_grp

File format group (0 = hard disk / DOS FAT).

Definition at line 197 of file sd.c.

◆ copy

uint8_t SD_CSD_INFO_ts::copy

Copy flag (0 = original).

Definition at line 198 of file sd.c.

◆ perm_write_protect

uint8_t SD_CSD_INFO_ts::perm_write_protect

Permanent write protection (1 = yes).

Definition at line 199 of file sd.c.

◆ tmp_write_protect

uint8_t SD_CSD_INFO_ts::tmp_write_protect

Temporary write protection (1 = yes).

Definition at line 200 of file sd.c.

◆ file_format

uint8_t SD_CSD_INFO_ts::file_format

File format of the card.

Definition at line 201 of file sd.c.

◆ wp_upc

uint8_t SD_CSD_INFO_ts::wp_upc

Write protect until power cycle.

Definition at line 202 of file sd.c.

◆ crc

uint8_t SD_CSD_INFO_ts::crc

CRC7 checksum of the CSD register.

Definition at line 203 of file sd.c.

The documentation for this struct was generated from the following file: