started work on the CHIP-8 interpreter

Interpreter.hpp

@@ -0,0 +1,51 @@
+#pragma once
+
+#include "Peripherals.hpp"
+
+#include <cstdint>
+#include <vector>
+#include <stack>
+
+namespace chocochip8 {
+
+class Interpreter {
+public:
+  constexpr static uint16_t scResetVector = 0x0200;
+  constexpr static size_t scMemorySize = 4096;
+
+private:
+  enum {
+    R_V0, R_V1, R_V2, R_V3, R_V4, R_V5, R_V6, R_V7,
+    R_V8, R_V9, R_VA, R_VB, R_VC, R_VD, R_VE, R_VF,
+    R_COUNT
+  };
+
+  enum {
+    SR_PC, SR_I, SR_T1, SR_T2,
+    SR_COUNT
+  };
+
+  enum class Opcode {
+    SET, ADD, SUB, SUB2, AND, OR, XOR, LSH, RSH, RAND, JEQ, JNEQ, UNIMPL
+  };
+
+public:
+  Interpreter(unsigned ticksPerSecond, Display &display, Buzzer &buzzer, Keypad &keypad);
+  void tick();
+  void loadProgram(uint16_t where, char const* data, size_t count);
+
+private:
+  void executeArithmetic(Opcode opcode, int iReg, uint8_t operand);
+
+private:
+  std::vector<uint8_t> mvMemory;
+  std::stack<uint16_t> mCallStack;
+  Display &mrDisplay;
+  Buzzer &mrBuzzer;
+  Keypad &mrKeypad;
+  const unsigned mcTicksPerSecond;
+  unsigned mvSpecialReg[SR_COUNT];
+  uint8_t mvReg[R_COUNT];
+}; // class Interpreter
+
+}; // namespace chocohip8