From 85ca4f19a232775105a1373622e0638fb09d0495 Mon Sep 17 00:00:00 2001
From: hkz <tabaglio@posteo.net>
Date: Tue, 15 Jul 2025 21:14:14 +0200
Subject: [PATCH] Begin with basic init

---
 Makefile            |  3 ++-
 src/game_graphics.c |  7 +++++++
 src/game_graphics.h |  8 ++++++++
 src/main.c          | 15 ++++++++++++++-
 src/tk2k_startup.s  | 10 +++++-----
 5 files changed, 36 insertions(+), 7 deletions(-)
 create mode 100644 src/game_graphics.c
 create mode 100644 src/game_graphics.h

diff --git a/Makefile b/Makefile
index 6fcf927..7fb5ea8 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,8 @@ LIBS=clib-6502.a
 
 # Common source files
 ASM_SRCS = tk2k_startup.s
-C_SRCS = main.c monitor_subroutines.c utility.c
+C_SRCS = main.c monitor_subroutines.c utility.c \
+		game_graphics.c
 
 # Object files
 OBJS = $(ASM_SRCS:%.s=%.o) $(C_SRCS:%.c=%.o)
diff --git a/src/game_graphics.c b/src/game_graphics.c
new file mode 100644
index 0000000..eeed217
--- /dev/null
+++ b/src/game_graphics.c
@@ -0,0 +1,7 @@
+#include "game_graphics.h"
+
+#include "mem_map.h"
+
+void draw_game_background(void) {
+
+}
diff --git a/src/game_graphics.h b/src/game_graphics.h
new file mode 100644
index 0000000..f51a35e
--- /dev/null
+++ b/src/game_graphics.h
@@ -0,0 +1,8 @@
+#ifndef _GAME_GRAPHICS_HEADER_
+#define _GAME_GRAPHICS_HEADER_
+
+#include <stdint.h>
+
+void draw_game_background(void);
+
+#endif /* _GAME_GRAPHICS_HEADER_ */
diff --git a/src/main.c b/src/main.c
index 81535d7..0d5ea5e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -9,9 +9,22 @@
 
 #include "monitor_subroutines.h"
 
-__task int main () {
+
+// Low level initialization
+void __low_level_init(void) {
 	POKE(P3_PWRDUP, 0); // Dirty the value checked by the reset vector
 	PEEK(IO_ROMSEL); // Make sure the ROM is selected
+	
+	PEEK(IO_DISPLAY_BW); // Disable colors
+	PEEK(IO_DISPLAY_PAGE1); // Select the first display page
+	
+	// Clear display memory
+	memset((void*)DISPLAY_PAGE_1, 0, DISPLAY_PAGE_SIZE);
+	memset((void*)DISPLAY_PAGE_2, 0, DISPLAY_PAGE_SIZE);
+}
+
+__task int main(void) {
+
 
 	while(1){
 
diff --git a/src/tk2k_startup.s b/src/tk2k_startup.s
index 146a92a..0092cfa 100644
--- a/src/tk2k_startup.s
+++ b/src/tk2k_startup.s
@@ -8,7 +8,7 @@
               .section data_init_table
 			  .section registers    ; pseudo registers in zero page
 
-              .extern main, exit
+              .extern main, exit, __low_level_init
               .extern _Zp, _Vsp, _Vfp
 
               .pubweak __program_root_section, __program_start
@@ -87,10 +87,10 @@ __call_heap_initialize:
 ;;;
 ;;; ***************************************************************************
 
-              .section code
-              .pubweak __low_level_init
-__low_level_init:
-              rts
+;;;              .section code
+;;;              .pubweak __low_level_init
+;;;__low_level_init:
+;;;              rts
 
 ;;; ***************************************************************************
 ;;;