common: Implement Storage::read() in Mx25l.

diff --git a/src/common/mx25l.rs b/src/common/mx25l.rs
index 6e74f4ac006bf52dfae59b808882f0981e21e3ac..24f9c36cb5a4f91d346ea69cc1c1c8eb8f86a45a 100644 (file)
--- a/src/common/mx25l.rs
+++ b/src/common/mx25l.rs
@@ -23,6 +23,7 @@
 
 use gpio;
 use spi;
+use storage::Storage;
 
 pub struct Mx25l {
     cs_gpio: u32,
@@ -30,6 +31,7 @@ pub struct Mx25l {
 }
 
 enum Command {
+    READ = 0x03,
     RDSR = 0x05,
     RDID = 0x9f,
 }
@@ -74,3 +76,19 @@ impl Mx25l {
         r
     }
 }
+
+impl Storage for Mx25l {
+    fn read(&self, address: usize, buffer: &mut [u8]) {
+        self.with_selected(|| {
+            spi::tx8(spi::SPI0, Command::READ as u8);
+
+            spi::tx8(spi::SPI0, (address >> 16) as u8);
+            spi::tx8(spi::SPI0, (address >>  8) as u8);
+            spi::tx8(spi::SPI0, (address >>  0) as u8);
+
+            for i in 0..buffer.len() {
+                buffer[i] = spi::tx8(spi::SPI0, 0xff);
+            }
+        })
+    }
+}