Use bus for all memory types, etc.

Rename Memory to Bus

1 files changed, 50 insertions, 0 deletions

diff --git a/src/ram.rs b/src/ram.rs
new file mode 100644
index 0000000..7027a0e
--- /dev/null
+++ b/src/ram.rs
@@ -0,0 +1,50 @@
+use super::bus::Bus;
+use std::fmt;
+
+const RESET_VALUE_ACC: u8 = 0x00;
+const RESET_VALUE_SP: u8 = 0x07;
+
+pub const RAM_OFFSET_ACC: u8 = 0xE0;
+pub const RAM_OFFSET_SP: u8 = 0x80;
+
+pub struct Ram {
+    array: [u8; u8::max_value() as usize + 1],
+}
+
+impl fmt::Debug for Ram {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mut v: Vec<char> = vec![];
+        for (c, x) in self.array.iter().enumerate() {
+            for hex_char in format!("{:02X}", *x).chars() {
+                v.push(hex_char);
+            }
+            v.push(' ');
+            if c % 8 == 7 {
+                v.push('\n');
+            }
+        }
+        write!(f, "{}", v.iter().collect::<String>())
+    }
+}
+
+impl Ram {
+    /// Empty constructor
+    pub fn new() -> Self {
+        let mut array = [0; u8::max_value() as usize + 1];
+        array[RAM_OFFSET_SP as usize] = RESET_VALUE_SP;
+        array[RAM_OFFSET_ACC as usize] = RESET_VALUE_ACC;
+        Self {
+            array,
+        }
+    }
+}
+
+impl Bus<u8> for Ram {
+    fn get(&self, a: u8) -> u8 {
+        self.array[a as usize]
+    }
+
+    fn set(&mut self, a: u8, v: u8) {
+        self.array[a as usize] = v;
+    }
+}