From fee7b1fa64131bfda7e2cf7b43b69d7ab98e0274 Mon Sep 17 00:00:00 2001
From: ry755 <ryanst755@gmail.com>
Date: Fri, 11 Feb 2022 19:41:58 -0800
Subject: [PATCH] fox32rom: Add a small debug routine for printing to the
 terminal

---
 debug.asm | 17 +++++++++++++++++
 main.asm  |  1 +
 2 files changed, 18 insertions(+)
 create mode 100644 debug.asm

diff --git a/debug.asm b/debug.asm
new file mode 100644
index 0000000..a996647
--- /dev/null
+++ b/debug.asm
@@ -0,0 +1,17 @@
+; debug routines
+
+; print a string to the terminal
+; inputs:
+; r0: pointer to null-terminated string
+; outputs:
+; none
+debug_print:
+    push r1
+debug_print_loop:
+    mov r1, 0x00000000
+    out r1, [r0]
+    inc r0
+    cmp.8 [r0], 0x00
+    ifnz jmp debug_print_loop
+    pop r1
+    ret
\ No newline at end of file
diff --git a/main.asm b/main.asm
index 706c425..b4cf4ae 100644
--- a/main.asm
+++ b/main.asm
@@ -164,6 +164,7 @@ mount_boot_disk:
     ; code
     #include "boot.asm"
     #include "background.asm"
+    #include "debug.asm"
     #include "overlay.asm"
     #include "memory.asm"
     #include "menu.asm"