Enforce correct SD state at compilation using a new type

The struct `SdMmcSpi` had two separate methods for initialization and deinitialization. It was up to the user not to mess them up at runtime. A new `BlockSpi` struct takes over `BlockDevice` interface duties, making it impossible to use block procedures while the SD interface is in the wrong state.
rust-embedded-community · Aug 24, 2021 · 75433cc · 75433cc
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commit 75433cc
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diff --git a/src/lib.rs b/src/lib.rs
@@ -88,7 +88,7 @@ pub use crate::filesystem::{
     Timestamp, MAX_FILE_SIZE,
 };
 pub use crate::sdmmc::Error as SdMmcError;
-pub use crate::sdmmc::SdMmcSpi;
+pub use crate::sdmmc::{BlockSpi, SdMmcSpi};
 
 // ****************************************************************************
 //