1 files changed, 31 insertions, 0 deletions
diff --git a/fig-emulator-gb/src/Fig/Emulator/GB/Component/Serial.hs b/fig-emulator-gb/src/Fig/Emulator/GB/Component/Serial.hs
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--- /dev/null
+++ b/fig-emulator-gb/src/Fig/Emulator/GB/Component/Serial.hs
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+module Fig.Emulator.GB.Component.Serial where
+
+import Fig.Prelude
+import Prelude (fromIntegral)
+
+import Data.Char (chr)
+
+import Fig.Emulator.GB.Utils
+import Fig.Emulator.GB.Bus
+
+newtype SerialError = SerialError Text
+  deriving Show
+instance Exception SerialError
+instance Pretty SerialError where
+  pretty (SerialError b) = mconcat
+    [ "joystick error: "
+    , b
+    ]
+
+compSerial :: (MonadIO m, MonadThrow m) => Component m
+compSerial = Component
+  { compState = ()
+  , compMatches = (== 0xff01)
+  , compUpdate = \s _ -> pure s
+  , compWrite = \s _ v -> do
+      log $ mconcat
+        [ "wrote serial byte: ", tshow $ chr $ fromIntegral v
+        ]
+      pure s
+  , compRead = \_ _ -> pure 0x00
+  }