From dcc517c28d50d0ca56a1f9fa463b1eb938b9b450 Mon Sep 17 00:00:00 2001
From: Riyyi <riyyi3@gmail.com>
Date: Fri, 19 Aug 2022 21:09:22 +0200
Subject: [PATCH] Emulator: Set registers for the power-up sequence

---
 src/cpu.cpp  | 18 +++++++++++++++---
 src/cpu.h    |  2 +-
 src/main.cpp |  1 -
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/src/cpu.cpp b/src/cpu.cpp
index ab98215..b11dc8b 100644
--- a/src/cpu.cpp
+++ b/src/cpu.cpp
@@ -14,6 +14,21 @@
 CPU::CPU(uint32_t frequency)
 	: ProcessingUnit(frequency)
 {
+	// CGB registers
+	// https://gbdev.io/pandocs/Power_Up_Sequence.html#cpu-registers
+	m_a = 0x11;
+	m_bc = 0x0;    // B = 0x0,  C = 0x0
+	m_de = 0xff56; // D = 0xff, E = 0x56
+	m_hl = 0x000d; // H = 0x0,  L = 0x0d
+	m_pc = 0x100;
+	m_sp = 0xffe;
+
+	// Flags
+	m_z = 0x1;
+	m_n = 0x0;
+	m_h = 0x0;
+	m_c = 0x0;
+
 	m_shared_registers.emplace("a", &m_a);
 	m_shared_registers.emplace("bc", &m_bc);
 	m_shared_registers.emplace("de", &m_de);
@@ -37,9 +52,6 @@ void CPU::update()
 		// Read next opcode
 	}
 
-	m_a = 6;
-	m_bc = 732;
-
 	// print("This is an update from the CPU\n");
 }
 
diff --git a/src/cpu.h b/src/cpu.h
index 05e4a7d..990bf4f 100644
--- a/src/cpu.h
+++ b/src/cpu.h
@@ -42,8 +42,8 @@ private:
 	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
+	uint32_t m_sp { 0 }; // Stack Pointer
 
 	// Flags
 	uint32_t m_z { 0 }; // Zero flag
diff --git a/src/main.cpp b/src/main.cpp
index 36bdae0..08266dc 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -29,7 +29,6 @@ int main(int argc, char* argv[])
 	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"));