Emulator: Add register sharing to processing units

src/cpu.cpp

@@ -13,6 +13,16 @@
 CPU::CPU(uint32_t frequency)
 	: ProcessingUnit(frequency)
 {
+	m_shared_registers.emplace("a", &m_a);
+	m_shared_registers.emplace("bc", &m_bc);
+	m_shared_registers.emplace("de", &m_de);
+	m_shared_registers.emplace("hl", &m_hl);
+	m_shared_registers.emplace("sp", &m_sp);
+	m_shared_registers.emplace("pc", &m_pc);
+	m_shared_registers.emplace("z", &m_z);
+	m_shared_registers.emplace("n", &m_n);
+	m_shared_registers.emplace("h", &m_h);
+	m_shared_registers.emplace("c", &m_c);
 }
 
 CPU::~CPU()
@@ -26,7 +36,10 @@ void CPU::update()
 		// Read next opcode
 	}
 
-	print("This is an update from the CPU\n");
+	m_a = 6;
+	m_bc = 732;
+
+	// print("This is an update from the CPU\n");
 }
 
 void CPU::add(uint8_t opcode, uint8_t immediate)

src/cpu.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <cstdint> // int8_t, uint8_t, uint16_t, uint32_t
+#include <cstdint> // int8_t, uint8_t, uint32_t
 
 #include "processing-unit.h"
 
@@ -38,18 +38,18 @@ public:
 
 private:
 	// Registers
-	uint8_t m_a { 0 };   // Accumulator
-	uint16_t m_bc { 0 }; // BC
-	uint16_t m_de { 0 }; // DE
-	uint16_t m_hl { 0 }; // HL
-	uint16_t m_sp { 0 }; // Stack Pointer
-	uint16_t m_pc { 0 }; // Program Counter
+	uint32_t m_a { 0 };  // Accumulator
+	uint32_t m_bc { 0 }; // BC
+	uint32_t m_de { 0 }; // DE
+	uint32_t m_hl { 0 }; // HL
+	uint32_t m_sp { 0 }; // Stack Pointer
+	uint32_t m_pc { 0 }; // Program Counter
 
 	// Flags
-	uint8_t m_z { 0 }; // Zero flag
-	uint8_t m_n { 0 }; // Subtraction flag (BCD)
-	uint8_t m_h { 0 }; // Half Carry flag (BCD)
-	uint8_t m_c { 0 }; // Carry flag
+	uint32_t m_z { 0 }; // Zero flag
+	uint32_t m_n { 0 }; // Subtraction flag (BCD)
+	uint32_t m_h { 0 }; // Half Carry flag (BCD)
+	uint32_t m_c { 0 }; // Carry flag
 
 	int8_t m_wait_cycles { 0 };
 };

src/emu.cpp

@@ -1,4 +1,4 @@
-#include <cstdint> // uint8_t, uint32_t
+#include <cstdint> // uint32_t
 
 #include "cpu.h"
 #include "emu.h"
@@ -42,7 +42,7 @@ void Emu::writeMemory(const char* memory_space, uint32_t location, uint32_t valu
 	m_memory_spaces[memory_space][location] = value;
 }
 
-uint8_t Emu::readMemory(const char* memory_space, uint32_t location)
+uint32_t Emu::readMemory(const char* memory_space, uint32_t location)
 {
 	return m_memory_spaces[memory_space][location];
 }

src/emu.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <cstdint> // uint8_t, uint32_t
+#include <cstdint> // uint32_t
 #include <unordered_map>
 #include <vector>
 
@@ -20,15 +20,18 @@ public:
 	void addMemorySpace(const char* name, uint32_t size);
 
 	void writeMemory(const char* memory_space, uint32_t location, uint32_t value);
+	uint32_t readMemory(const char* memory_space, uint32_t location);
 
-	uint8_t readMemory(const char* memory_space, uint32_t location);
+	// -------------------------------------
+
+	ProcessingUnit* processingUnit(const char* name) const { return m_processing_units.at(name); }
 
 private:
-	uint32_t m_frequency = 0;
-	double m_timestep = 0;
-	uint32_t m_cycle = 0;
-	double m_cycle_time = 0;
-	double m_previous_time = 0;
+	uint32_t m_frequency { 0 };
+	double m_timestep { 0 };
+	uint32_t m_cycle { 0 };
+	double m_cycle_time { 0 };
+	double m_previous_time { 0 };
 
 	ruc::Timer m_timer;
 

src/main.cpp

@@ -3,13 +3,17 @@
 #include "cpu.h"
 #include "emu.h"
 #include "ppu.h"
+#include "ruc/format/print.h"
 #include "ruc/timer.h"
 
 int main(int argc, char* argv[])
 {
+	(void)argc;
+	(void)argv;
+
 	ruc::Timer t;
 
-	printf("%fms\n", t.elapsedNanoseconds() / 1000000.0);
+	print("{}ms\n", t.elapsedNanoseconds() / 1000000.0);
 
 	Emu::the().init(8000000);
 
@@ -24,6 +28,11 @@ int main(int argc, char* argv[])
 	Emu::the().addMemorySpace("ROM", 1024);
 	Emu::the().addMemorySpace("CARDROM", 1024);
 
+	// Get shared register
+	Emu::the().processingUnit("cpu")->update();
+	print("{}\n", *Emu::the().processingUnit("cpu")->sharedRegister("a"));
+	print("{}\n", *Emu::the().processingUnit("cpu")->sharedRegister("bc"));
+
 	while (true) {
 		Emu::the().update();
 	}

src/ppu.cpp

@@ -20,5 +20,5 @@ PPU ::~PPU()
 
 void PPU::update()
 {
-	print("ppu update\n");
+	// print("ppu update\n");
 }

src/processing-unit.cpp

@@ -17,8 +17,3 @@ ProcessingUnit::ProcessingUnit(uint32_t frequency)
 ProcessingUnit::~ProcessingUnit()
 {
 }
-
-uint32_t ProcessingUnit::frequency()
-{
-	return m_frequency;
-}

src/processing-unit.h

@@ -8,6 +8,7 @@
 #pragma once
 
 #include <cstdint> // uint32_t
+#include <unordered_map>
 
 class ProcessingUnit {
 public:
@@ -16,8 +17,12 @@ public:
 
 	virtual void update() = 0;
 
-	uint32_t frequency();
+	// -------------------------------------
 
-private:
+	uint32_t frequency() const { return m_frequency; };
+	uint32_t* sharedRegister(const char* shared_register) const { return m_shared_registers.at(shared_register); }
+
+protected:
 	uint32_t m_frequency { 0 };
+	std::unordered_map<const char*, uint32_t*> m_shared_registers;
 };