fig-emulator-gb: Debugging the PPU

1 files changed, 24 insertions, 0 deletions

diff --git a/fig-emulator-gb/src/Fig/Emulator/GB/Component/Misc.hs b/fig-emulator-gb/src/Fig/Emulator/GB/Component/Misc.hs
new file mode 100644
index 0000000..be15e56
--- /dev/null
+++ b/fig-emulator-gb/src/Fig/Emulator/GB/Component/Misc.hs
@@ -0,0 +1,24 @@
+module Fig.Emulator.GB.Component.Misc where
+
+import Fig.Prelude
+
+import Fig.Emulator.GB.Utils
+import Fig.Emulator.GB.Bus
+
+newtype MiscError = MiscError Text
+  deriving Show
+instance Exception MiscError
+instance Pretty MiscError where
+  pretty (MiscError b) = mconcat
+    [ "misc component error: "
+    , b
+    ]
+
+compMisc :: Component
+compMisc = Component
+  { compState = ()
+  , compMatches = (== 0xff4d)
+  , compUpdate = \s _ -> pure s
+  , compWrite = \s _ _ -> pure s
+  , compRead = \_ _ -> pure 0x00
+  }