[kbd] Add keyboard.rs

src/emu/keyboard.rs

@@ -0,0 +1,44 @@
+use crate::emu::memory::{Memory, RamMemory};
+use crate::misc::result::EmulatorResult;
+
+
+pub struct Keyboard<'a>{
+    dirty: bool,
+    bitflags: u16,
+    ram: &'a RamMemory
+}
+
+impl<'a> Keyboard<'a>{
+    pub fn new(ram:&'a RamMemory)->Keyboard<'a>{
+        Keyboard {
+            dirty: true,
+            bitflags:0,
+            ram
+        }
+    }
+
+    pub fn clear_keyboard(&mut self){
+        log::debug!("Keyboard clear");
+        self.bitflags = 0;
+        self.dirty = true;
+    }
+
+    pub fn key_down(&mut self,x:u8){
+        self.bitflags |= 1<<x;
+        log::debug!("Key Down, keyboard state {}",self.bitflags);
+        self.dirty = true
+    }
+    pub fn key_up(&mut self,x:u8){
+        self.bitflags &= !((1<<x) as u16);
+        log::debug!("Key Up, keyboard state {}",self.bitflags);
+        self.dirty = true
+    }
+    pub fn flush_keyboard(&mut self)->EmulatorResult<()>{
+        if self.dirty {
+            log::debug!("Flushing keyboard {}",self.bitflags);
+            self.ram.try_set_u16(0, self.bitflags)?;
+            self.dirty = false;
+        }
+        Ok(())
+    }
+}