fox32rom: Add a small debug routine for printing to the terminal

2022-02-11 19:41:58 -08:00 · 2022-02-11 19:41:58 -08:00 · fee7b1fa64
commit fee7b1fa64
parent e21aae6d08
2 changed files with 18 additions and 0 deletions
--- a/debug.asm
+++ 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
--- 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"