1 files changed, 33 insertions, 0 deletions
diff --git a/fig-emulator-gb/src/Fig/Emulator/GB/Component/Interrupt.hs b/fig-emulator-gb/src/Fig/Emulator/GB/Component/Interrupt.hs
new file mode 100644
index 0000000..ec5540c
--- /dev/null
+++ b/fig-emulator-gb/src/Fig/Emulator/GB/Component/Interrupt.hs
@@ -0,0 +1,33 @@
+module Fig.Emulator.GB.Component.Interrupt where
+
+import Fig.Prelude
+
+import Fig.Emulator.GB.Utils
+import Fig.Emulator.GB.Bus
+
+newtype InterruptError = InterruptError Text
+  deriving Show
+instance Exception InterruptError
+instance Pretty InterruptError where
+  pretty (InterruptError b) = mconcat
+    [ "interrupt error: "
+    , b
+    ]
+
+compInterrupt :: (MonadIO m, MonadThrow m) => Component m
+compInterrupt = Component
+  { compState = ()
+  , compMatches = \a -> a == 0xff0f || a == 0xffff
+  , compUpdate = \s _ -> pure s
+  , compWrite = \s (Addr a) v -> do
+      case a of
+        0xff0f -> do
+          -- log $ "set IF:" <> show8 v
+          pure ()
+        0xffff -> do
+          -- log $ "set IE:" <> show8 v
+          pure ()
+        _ -> throwM . InterruptError $ "write to invalid address: " <> pretty (Addr a)
+      pure s
+  , compRead = \_ _ -> pure 0x00
+  }