Improve CSD parsing

CHANGELOG.md

@@ -16,6 +16,14 @@ The format is based on [Keep a Changelog] and this project adheres to [Semantic
 - Renamed `delete_file_in_dir` to `delete_entry_in_dir` because it can now delete empty directories (breaking change)
 - Added `open_long_name_file_in_dir` API, to open files using their Long File Name
 - Updated directory iterator callback, to allow bailing out early (breaking change)
+- `crc7` function now returns the actual CRC7 value without left-shifting by and XOR-ing by/with 1.
+
+### Added
+
+- Added `CsdV3` data structure.
+- `Csd::new` constructor which creates the CSD from a raw `&[u8; 16]` and also performs a CRC7
+  check.
+- Added `verify_crc7` function on CSD structures.
 
 ## [Version 0.9.0] - 2025-06-08
 

Cargo.toml

@@ -18,8 +18,12 @@ byteorder = {version = "1", default-features = false}
 defmt = {version = "1.0.1", optional = true}
 embedded-hal = "1.0.0"
 embedded-io = "0.6.1"
+bitbybit = "2"
+arbitrary-int = "2"
+bitflags = "2"
 heapless = "0.9.1"
 log = {version = "0.4", default-features = false, optional = true}
+thiserror = {version="2", default-features = false}
 
 [dev-dependencies]
 chrono = "0.4"
@@ -31,6 +35,6 @@ sha2 = "0.10"
 
 [features]
 default = ["log"]
-defmt-log = ["dep:defmt"]
+defmt-log = ["dep:defmt", "arbitrary-int/defmt"]
 log = ["dep:log"]
 

src/sdcard/mod.rs

@@ -278,6 +278,7 @@ where
         let num_blocks = match csd {
             Csd::V1(ref contents) => contents.card_capacity_blocks(),
             Csd::V2(ref contents) => contents.card_capacity_blocks(),
+            Csd::V3(ref contents) => contents.card_capacity_blocks(),
         };
         Ok(BlockCount(num_blocks))
     }
@@ -289,6 +290,7 @@ where
         match csd {
             Csd::V1(ref contents) => Ok(contents.card_capacity_bytes()),
             Csd::V2(ref contents) => Ok(contents.card_capacity_bytes()),
+            Csd::V3(ref contents) => Ok(contents.card_capacity_bytes()),
         }
     }
 
@@ -298,27 +300,27 @@ where
         match csd {
             Csd::V1(ref contents) => Ok(contents.erase_single_block_enabled()),
             Csd::V2(ref contents) => Ok(contents.erase_single_block_enabled()),
+            Csd::V3(ref contents) => Ok(contents.erase_single_block_enabled()),
         }
     }
 
     /// Read the 'card specific data' block.
     fn read_csd(&mut self) -> Result<Csd, Error> {
+        let mut csd_raw: [u8; 16] = [0; 16];
         match self.card_type {
             Some(CardType::SD1) => {
-                let mut csd = CsdV1::new();
                 if self.card_command(CMD9, 0)? != 0 {
                     return Err(Error::RegisterReadError);
                 }
-                self.read_data(&mut csd.data)?;
-                Ok(Csd::V1(csd))
+                self.read_data(&mut csd_raw)?;
+                Ok(Csd::V1(CsdV1::from_be_bytes(&csd_raw)))
             }
             Some(CardType::SD2 | CardType::SDHC) => {
-                let mut csd = CsdV2::new();
                 if self.card_command(CMD9, 0)? != 0 {
                     return Err(Error::RegisterReadError);
                 }
-                self.read_data(&mut csd.data)?;
-                Ok(Csd::V2(csd))
+                self.read_data(&mut csd_raw)?;
+                Ok(Csd::V2(CsdV2::from_be_bytes(&csd_raw)))
             }
             None => Err(Error::CardNotFound),
         }