From c7c3d272128e181219b385a0cc4d2da7495b6dac Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Sun, 17 Nov 2024 07:25:51 +0100
Subject: [PATCH] WIP: sram functionality

---
 src/main.s |  1 +
 src/mem.s  | 16 ++++++++++++++--
 src/sram.s | 11 +++++++++++
 3 files changed, 26 insertions(+), 2 deletions(-)
 create mode 100644 src/sram.s

diff --git a/src/main.s b/src/main.s
index b6308cd..d336459 100644
--- a/src/main.s
+++ b/src/main.s
@@ -2,6 +2,7 @@
 #include "macros.inc"
 #include "oam.s"
 #include "wram.s"
+#include "sram.s"
 
 .org 0x0
 #include "jmp.inc"
diff --git a/src/mem.s b/src/mem.s
index 47ef253..d5cd13c 100644
--- a/src/mem.s
+++ b/src/mem.s
@@ -15,7 +15,7 @@ mem_init:
   ld a, GM_GAME
   ld [game_mode], a
 
-  call mbc1_ram_enable 
+  call mbc1_init
 
   ret
 
@@ -67,7 +67,19 @@ shadow_oam_to_oam:
   ret 
 shadow_oam_to_oam_end:
 
-; MBC1 functions 
+
+; ==============
+; MBC1 functions
+; ==============
+
+  ; if the first byte of sram is not this 
+  ; value clear it all
+#define MBC1_SRAM_MAGIC 0xA1 
+
+mbc1_init:
+  call mbc1_ram_enable
+  ret
+
 
   ; ram enable mbc1
   ; TODO: it is reccomended to disable ram when not 
diff --git a/src/sram.s b/src/sram.s
new file mode 100644
index 0000000..81e48de
--- /dev/null
+++ b/src/sram.s
@@ -0,0 +1,11 @@
+#define SRAM 0xA000
+#define SRAMLEN 0x1FFF
+
+.org SRAM
+
+  ; if the first byte of sram is not this 
+  ; value clear it all
+#define SRAM_MAGIC 0xA1 
+
+  ; flag for init of sram
+sram_magic: .adv 1
-- 
2.30.2