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rust/src/hal/little_fs2storage_adapter.rs

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+use embedded_storage::{ReadStorage, Storage};
+use esp_bootloader_esp_idf::partitions::FlashRegion;
+use esp_storage::FlashStorage;
+use littlefs2::consts::U512 as lfsCache;
+use littlefs2::consts::U512 as lfsLookahead;
+use littlefs2::driver::Storage as lfs2Storage;
+use littlefs2::fs::Filesystem as lfs2Filesystem;
+use littlefs2::io::Error as lfs2Error;
+use littlefs2::io::Result as lfs2Result;
+use log::{error, info};
+
+pub struct LittleFs2Filesystem {
+    pub(crate) storage: &'static mut FlashRegion<'static, FlashStorage>,
+}
+
+impl lfs2Storage for LittleFs2Filesystem {
+    const READ_SIZE: usize = 256;
+    const WRITE_SIZE: usize = 512;
+    const BLOCK_SIZE: usize = 512; //usually optimal for flash access
+    const BLOCK_COUNT: usize = 8 * 1024 * 1024 / 512; //8mb in 32kb blocks
+    const BLOCK_CYCLES: isize = 100;
+    type CACHE_SIZE = lfsCache;
+    type LOOKAHEAD_SIZE = lfsLookahead;
+
+    fn read(&mut self, off: usize, buf: &mut [u8]) -> lfs2Result<usize> {
+        let read_size: usize = Self::READ_SIZE;
+        assert_eq!(off % read_size, 0);
+        assert_eq!(buf.len() % read_size, 0);
+        match self.storage.read(off as u32, buf) {
+            anyhow::Result::Ok(..) => lfs2Result::Ok(buf.len()),
+            Err(err) => {
+                error!("Littlefs2Filesystem read error: {:?}", err);
+                Err(lfs2Error::IO)
+            }
+        }
+    }
+
+    fn write(&mut self, off: usize, data: &[u8]) -> lfs2Result<usize> {
+        info!(
+            "Littlefs2Filesystem write at offset {} with len {}",
+            off,
+            data.len()
+        );
+        let write_size: usize = Self::WRITE_SIZE;
+        assert_eq!(off % write_size, 0);
+        assert_eq!(data.len() % write_size, 0);
+        match self.storage.write(off as u32, data) {
+            anyhow::Result::Ok(..) => lfs2Result::Ok(data.len()),
+            Err(err) => {
+                error!("Littlefs2Filesystem write error: {:?}", err);
+                Err(lfs2Error::IO)
+            }
+        }
+    }
+
+    fn erase(&mut self, off: usize, len: usize) -> lfs2Result<usize> {
+        info!(
+            "Littlefs2Filesystem erase at offset {} with len {}",
+            off, len
+        );
+        let block_size: usize = Self::BLOCK_SIZE;
+        debug_assert!(off % block_size == 0);
+        debug_assert!(len % block_size == 0);
+        //match self.storage.erase(off as u32, len as u32) {
+        //anyhow::Result::Ok(..) => lfs2Result::Ok(len),
+        //Err(err) => {
+        //error!("Littlefs2Filesystem erase error: {:?}", err);
+        //Err(lfs2Error::IO)
+        //    }
+        //}
+        lfs2Result::Ok(len)
+    }
+}