zynq::flash: abstract SpiFlashRegister

src/zynq/flash/mod.rs

@@ -8,14 +8,12 @@ use super::clocks::CpuClocks;
 mod regs;
 mod bytes;
 pub use bytes::{BytesTransferExt, BytesTransfer};
+mod spi_flash_register;
+use spi_flash_register::*;
 
 const FLASH_BAUD_RATE: u32 = 50_000_000;
 const SINGLE_CAPACITY: u32 = 16 * 1024 * 1024;
 
-/// Instruction: Read Configure Register
-const INST_RDCR: u8 = 0x35;
-/// Instruction: Read Status Register-1
-const INST_RDSR1: u8 = 0x05;
 /// Instruction: Read Identification
 const INST_RDID: u8 = 0x9F;
 
@@ -349,23 +347,14 @@ impl Flash<Manual> {
         self.transition()
     }
 
-    /// Read Configuration Register
-    pub fn rdcr(&mut self) -> u8 {
-        let args = Some((INST_RDCR as u32) << 24);
-        self.transfer(args.into_iter(), 4)
-            .bytes_transfer().skip(1)
-            .next().unwrap() as u8
+    pub fn read_reg<R: SpiFlashRegister>(&mut self) -> R {
+        let args = Some(R::inst_code());
+        let transfer = self.transfer(args.into_iter(), R::transfer_len())
+            .bytes_transfer().skip(1);
+        R::new(transfer)
     }
 
-    /// Read Status Register-1
-    pub fn rdsr1(&mut self) -> u8 {
-        let args = Some(INST_RDSR1 as u8);
-        self.transfer(args.into_iter(), 2)
-            .bytes_transfer().skip(1)
-            .next().unwrap()
-    }
-
-    /// Read Identifiaction
+    /// Read Identification
     pub fn rdid(&mut self) -> core::iter::Skip<BytesTransfer<Transfer<core::option::IntoIter<u32>, u32>>> {
         let args = Some((INST_RDID as u32) << 24);
         self.transfer(args.into_iter(), 0x44)

src/zynq/flash/spi_flash_register.rs

@@ -0,0 +1,58 @@
+use bit_field::BitField;
+
+pub trait SpiFlashRegister {
+    fn inst_code() -> u8;
+    fn transfer_len() -> usize;
+    fn new<I: Iterator<Item=u8>>(src: I) -> Self;
+}
+
+macro_rules! u8_register {
+    ($name: ident, $inst_code: expr) => {
+        #[derive(Clone)]
+        pub struct $name {
+            pub inner: u8,
+        }
+
+        impl SpiFlashRegister for $name {
+            fn inst_code() -> u8 {
+                $inst_code
+            }
+
+            fn transfer_len() -> usize {
+                2
+            }
+
+            fn new<I: Iterator<Item=u8>>(mut src: I) -> Self {
+                $name {
+                    inner: src.next().unwrap(),
+                }
+            }
+        }
+    };
+}
+
+u8_register!(CR, 0x35);
+u8_register!(SR1, 0x05);
+impl SR1 {
+    /// Write In Progress
+    pub fn wip(&self) -> bool {
+        self.inner.get_bit(0)
+    }
+
+    /// Write Enable Latch
+    pub fn wel(&self) -> bool {
+        self.inner.get_bit(1)
+    }
+
+    /// Erase Error Occurred
+    pub fn e_err(&self) -> bool {
+        self.inner.get_bit(5)
+    }
+
+    /// Programming Error Occurred
+    pub fn p_err(&self) -> bool {
+        self.inner.get_bit(6)
+    }
+}
+
+u8_register!(SR2, 0x07);