From: Tilman Sauerbeck <tilman@code-monkey.de>
Date: Wed, 8 Jan 2020 09:48:31 +0000 (+0100)
Subject: common: Implement Storage::write() in Mx25l.
X-Git-Url: http://git.code-monkey.de/?p=gps-watch.git;a=commitdiff_plain;h=a6747c47ca99a182f6cb4c41bad0232fb2754ff7

common: Implement Storage::write() in Mx25l.
---

diff --git a/src/common/mx25l.rs b/src/common/mx25l.rs
index 2cc79f0..a6ad395 100644
--- a/src/common/mx25l.rs
+++ b/src/common/mx25l.rs
@@ -23,7 +23,7 @@
 
 use gpio;
 use spi;
-use storage::Storage;
+use storage::{Storage, Error};
 
 const SECTOR_SIZE: usize = 4096;
 const PAGE_SIZE:   usize = 256;
@@ -42,10 +42,6 @@ enum Command {
     RDID = 0x9f,
 }
 
-pub enum Error {
-    UnalignedAddress = 1,
-}
-
 const SR_WIP: u8 = 1 << 0;
 
 impl Mx25l {
@@ -162,4 +158,25 @@ impl Storage for Mx25l {
             }
         })
     }
+
+    fn write(&mut self, address: usize, buffer: &[u8; SECTOR_SIZE])
+             -> Result<(), Error> {
+        if let Err(e) = self.erase_sector(address) {
+            return Err(e);
+        }
+
+        for (i, page_bytes) in buffer.chunks(PAGE_SIZE).enumerate() {
+            let page_address = address + (i * PAGE_SIZE);
+
+            // XXX: Inefficient.
+            let mut ba = [0xff; PAGE_SIZE];
+            ba.copy_from_slice(&page_bytes);
+
+            if let Err(e) = self.program_page(page_address, &ba) {
+                return Err(e);
+            }
+        }
+
+        Ok(())
+    }
 }
diff --git a/src/common/storage.rs b/src/common/storage.rs
index 7f09446..784a1f6 100644
--- a/src/common/storage.rs
+++ b/src/common/storage.rs
@@ -21,6 +21,12 @@
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+pub enum Error {
+    UnalignedAddress = 1,
+}
+
 pub trait Storage {
     fn read(&self, address: usize, buffer: &mut [u8]);
+
+    fn write(&mut self, address: usize, buffer: &[u8; 4096]) -> Result<(), Error>;
 }