[ref] Refactor memory

src/misc/emulator_error.rs

@@ -4,6 +4,8 @@ use std::fmt::Debug;
 pub enum DeviceType {
     RAM,
     MMU,
+    /// Program counter
+    PC,
     KEYBOARD,
     AUDIO,
     GRAPHICS,

src/misc/endian.rs

@@ -1,18 +1,13 @@
 use byteorder::{BigEndian, ByteOrder};
 
-pub struct MemoryOperations();
-
-impl MemoryOperations {
-    /// read a 24bit endian value, and place it in a u32 num
-    pub fn read_big_endian_u24(input: &[u8; 3]) -> u32 {
-        BigEndian::read_u24(input)
-    }
-
-    pub fn read_big_endian_u16(input: &[u8; 2]) -> u16 {
-        BigEndian::read_u16(input)
-    }
-    /// Write 24-bit endian number into slice
-    pub fn write_big_endian_u24(input: u32, output_slice: &mut [u8; 3]) {
-        BigEndian::write_u24(output_slice, input);
-    }
+pub fn read_big_endian_u24(input: &[u8; 3]) -> u32 {
+    BigEndian::read_u24(input)
 }
+
+pub fn read_big_endian_u16(input: &[u8; 2]) -> u16 {
+    BigEndian::read_u16(input)
+}
+/// Write 24-bit endian number into slice
+pub fn write_big_endian_u24(input: u32, output_slice: &mut [u8; 3]) {
+    BigEndian::write_u24(output_slice, input);
+}