From 8d3aca3c66b88097f59155efbb6ffca52b6a82b9 Mon Sep 17 00:00:00 2001
From: GearsProgress <weber.austint@gmail.com>
Date: Fri, 22 May 2026 13:49:04 -0400
Subject: [PATCH] Obtaining checksum from GB

---
 include/link_handler.h    |  2 ++
 source/dbg/debug_mode.cpp |  2 +-
 source/link_handler.cpp   | 11 +++++++----
 source/main.cpp           |  2 +-
 4 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/link_handler.h b/include/link_handler.h
index 6faae7e..def0fa5 100644
--- a/include/link_handler.h
+++ b/include/link_handler.h
@@ -83,6 +83,8 @@ public:
     byte data_packet[PACKET_SIZE];
     byte curr_payload[0x2A0];
     int curr_payload_size = 0;
+    byte dataOutBuffer[0xFF];
+    int dataOutBufferCurrIndex = 0;
 
     bool paused = false; // Used for pausing and sending one byte at a time
 
diff --git a/source/dbg/debug_mode.cpp b/source/dbg/debug_mode.cpp
index e4826c0..a9314eb 100644
--- a/source/dbg/debug_mode.cpp
+++ b/source/dbg/debug_mode.cpp
@@ -2,7 +2,7 @@
 
 debug_options g_debug_options = 
 {
-    .print_link_data = (true && DEBUG_MODE),
+    .print_link_data = (false && DEBUG_MODE),
     .instant_text_speed = (true && DEBUG_MODE),
     .ignore_game_pak = (true && DEBUG_MODE),
     .ignore_game_pak_sprites = (false && DEBUG_MODE),
diff --git a/source/link_handler.cpp b/source/link_handler.cpp
index 77f5065..0464715 100644
--- a/source/link_handler.cpp
+++ b/source/link_handler.cpp
@@ -300,6 +300,8 @@ void LinkConnection::logicState_initConnection()
     if (inData == 0xFD)
     {
       subState = GET_CHECKSUM;
+      g_debug_options.print_link_data = true;
+      paused = true;
     }
     outData = 0x00;
     break;
@@ -308,16 +310,17 @@ void LinkConnection::logicState_initConnection()
 
     if (inData != 0xFD)
     {
-      outData = 0xFD;
+      dataOutBuffer[dataOutBufferCurrIndex] = inData;
+      dataOutBufferCurrIndex++;
+      outData = 0x01;
     }
-
-    else if (subStateCounter >= 10)
+    else if (inData == 0xFD && dataOutBufferCurrIndex > 0)
     {
       subState = END;
     }
     else
     {
-      outData = 0x01;
+      outData = 0xFD;
     }
     break;
 
diff --git a/source/main.cpp b/source/main.cpp
index 1ebda4f..0be4c68 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -79,7 +79,7 @@ void initialization_script(void)
 	REG_IME = 0;
 	REG_IE = 0;
 
-	irq_init(NULL);
+	irq_init(&isr_master_nest);
 
 	// Sound bank init
 	// irq_init(NULL);