more instructions and tests passing.

core/src/periph/at28c256/default.rs

@@ -0,0 +1,22 @@
+use crate::constants::constants_system::SIZE_32KB;
+use crate::periph::at28c256::At28C256;
+use crate::periph::hm62256::Hm62256;
+
+impl Default for At28C256 {
+    fn default() -> Self {
+        let vec = vec![0xea; SIZE_32KB];
+        let boxed_slice: Box<[u8]> = vec.into_boxed_slice();
+        let boxed_array: Box<[u8; SIZE_32KB]> = boxed_slice.try_into().expect("Failed to convert Vec to boxed array");
+        At28C256 {
+            data: boxed_array,
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn smoke() { assert!(true); }
+}

core/src/periph/at28c256/mod.rs

@@ -1,3 +1,6 @@
+mod default;
+mod rom_chip;
+
 use crate::constants::constants_system::SIZE_32KB;
 use crate::periph::rom_chip::RomChip;
 
@@ -11,31 +14,6 @@ pub struct At28C256 {
     data: Box<[u8; SIZE_32KB]>,
 }
 
-impl Default for At28C256 {
-    fn default() -> Self {
-        let vec = vec![0x00; SIZE_32KB];
-        let boxed_slice: Box<[u8]> = vec.into_boxed_slice();
-        let boxed_array: Box<[u8; SIZE_32KB]> = boxed_slice.try_into().expect("Failed to convert Vec to boxed array");
-        At28C256 {
-            data: boxed_array,
-        }
-    }
-}
-
-impl RomChip for At28C256 {
-
-    fn read(&self, offset: &u16) -> u8 {
-        self.data[*offset as usize]
-    }
-
-    fn program(new_data: Box<[u8; SIZE_32KB]>) -> Box<At28C256> {
-        println!("Writing new chip.");
-        let mut working = At28C256::default();
-        working.data = Box::new(*new_data);
-        working.into()
-    }
-}
-
 #[cfg(test)]
 mod test {
     use crate::constants::constants_system::SIZE_1KB;

core/src/periph/at28c256/rom_chip.rs

@@ -0,0 +1,27 @@
+use crate::constants::constants_system::SIZE_32KB;
+use crate::periph::at28c256::At28C256;
+use crate::periph::rom_chip::RomChip;
+
+impl RomChip for At28C256 {
+
+    fn read(&self, offset: &u16) -> u8 {
+        self.data[*offset as usize]
+    }
+
+    fn program(new_data: Box<[u8; SIZE_32KB]>) -> Box<At28C256> {
+        println!("Writing new chip.");
+        let mut working = At28C256::default();
+        working.data = Box::new(*new_data);
+        working.into()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn smoke() { assert!(true); }
+
+
+}

core/src/periph/hm62256.rs

@@ -5,9 +5,9 @@ use crate::constants::constants_system::SIZE_32KB;
 use crate::periph::ram_chip::RamChip;
 use crate::periph::rom_chip::RomChip;
 
-struct Hm62256 {
-    base_offset: u16,
-    data: Box<[u8]>
+pub struct Hm62256 {
+    pub(crate) base_offset: u16,
+    pub(crate) data: Box<[u8]>
 }
 
 impl Default for Hm62256 {
@@ -24,8 +24,9 @@ impl Default for Hm62256 {
 
 impl RomChip for Hm62256 {
     fn read(&self, offset: &u16) -> u8 {
-        //println!("READING FROM RAM AT [{offset:04x}]");
-        self.data[*offset as usize]
+        // loops memory around past 32k
+        let effective = *offset as i32  % SIZE_32KB as i32;
+        self.data[effective as usize]
     }
 
     fn program(_: Box<[u8; SIZE_32KB]>) -> Box<Self> {

core/src/periph/mod.rs

@@ -2,5 +2,5 @@ pub mod rom_chip;
 
 pub mod at28c256;
 pub mod ram_chip;
-mod hm62256;
+pub mod hm62256;