Implement EXI interrupt support

dolphin-emu · Dec 17, 2021 · 55241be · 55241be
1 parent 19df1bd
commit 55241be
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Showing 2 changed files with 47 additions and 0 deletions.
diff --git a/Source/Core/Core/HW/EXI/EXI_DeviceBaseboard.cpp b/Source/Core/Core/HW/EXI/EXI_DeviceBaseboard.cpp
@@ -39,17 +39,59 @@ void CEXIBaseboard::TransferByte(u8& byte)
       byte = ID[(m_position - 2) & 3];
       break;
     }
+    case 0x01:
+      byte = 0x01;
+      break;
+    case 0x02:
+      byte = 0x01;
+      break;
+    case 0x03:
+      byte = 0x01;
+      break;
+    case 0xFF:
+    {
+      if ((m_subcommand[1] == 0) && (m_subcommand[2] == 0))
+      {
+        m_have_irq = true;
+        m_irq_timer = 0;
+        m_irq_status = 0x02;
+      }
+      if ((m_subcommand[1] == 2) && (m_subcommand[2] == 1))
+      {
+        m_irq_status = 0;
+      }
+      byte = 0x04;
+      break;
+    }
     default:
       ERROR_LOG_FMT(EXPANSIONINTERFACE, "EXI BASEBOARD: Unhandled command {:#x} {:#x}", m_command,
                     m_position);
+      byte = 0x04;
+      break;
     }
   }
   m_position++;
 }
 
+bool CEXIBaseboard::IsInterruptSet()
+{
+  if (m_have_irq)
+  {
+    if (++m_irq_timer > 4)
+      m_have_irq = false;
+    return 1;
+  }
+  else
+  {
+    return 0;
+  }
+}
+
 void CEXIBaseboard::DoState(PointerWrap& p)
 {
   p.Do(m_position);
   p.Do(m_command);
+  p.Do(m_subcommand);
+  p.Do(m_have_irq);
 }
 }  // namespace ExpansionInterface
diff --git a/Source/Core/Core/HW/EXI/EXI_DeviceBaseboard.h b/Source/Core/Core/HW/EXI/EXI_DeviceBaseboard.h
@@ -15,12 +15,17 @@ class CEXIBaseboard : public IEXIDevice
   CEXIBaseboard();
   void SetCS(int CS) override;
   bool IsPresent() const override;
+  bool IsInterruptSet();
   void DoState(PointerWrap& p) override;
 
 private:
   // STATE_TO_SAVE
+  bool m_have_irq;
   u32 m_position = 0;
   u32 m_command = 0;
+  u8* m_subcommand = (u8*)&m_command;
+  u32 m_irq_timer;
+  u32 m_irq_status;
 
   void TransferByte(u8& byte) override;
 };