Diff: cpu.h

Revision:

17:c9afe1a7b423

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cpu.h	Sun Jan 13 19:00:10 2019 +0000
@@ -0,0 +1,49 @@
+#ifndef GBC_CPU_H
+#define GBC_CPU_H
+
+#include "types.h"
+
+// 16 bit register
+union reg {
+  u16 v;
+  struct {
+    u8 lo;
+    u8 hi;
+  };
+};
+
+struct CpuState {
+  // registers
+  reg bc, de, hl;
+  u8 f;
+  u8 a;
+  u16 sp, pc;
+
+  bool halt;
+  uint64_t cycleCount;
+  uint64_t divOffset;
+  u8 ime;
+  u32 timSubcount;
+};
+
+// external interface:
+extern CpuState globalState;
+void resetCpu(); // reinitialize the cpu
+u32 cpuStep();   // step 1 instruction, returns number of clock cycles elapsed
+
+
+bool getZeroFlag();
+bool getSubtractFlag();
+bool getHalfCarryFlag();
+bool getCarryFlag();
+void setZeroFlag();
+void clearZeroFlag();
+void setSubtractFlag();
+void clearSubtractFlag();
+void setHalfCarryFlag();
+void clearHalfCarryFlag();
+void setCarryFlag();
+void clearCarryFlag();
+void clearAllFlags();
+
+#endif //GBC_CPU_H
\ No newline at end of file