Add sound support

1 files changed, 9 insertions, 0 deletions

diff --git a/src/timer.c b/src/timer.c
index f3c5898..8702233 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -8,6 +8,7 @@ volatile uint32_t clock = 0;
 volatile uint8_t clock_secs = 0;
 volatile uint8_t clock_enabled = 0;
 volatile uint8_t *clock_updated = NULL;
+volatile void (*user_fn)(void) = NULL;
 
 static _go32_dpmi_seginfo old_handler, new_handler;
 
@@ -29,6 +30,9 @@ static void timer_handler()
             }
         }
     }
+
+    if (user_fn)
+        user_fn();
 }
 
 void timer_init()
@@ -39,6 +43,11 @@ void timer_init()
     _go32_dpmi_chain_protected_mode_interrupt_vector(0x1c, &new_handler);
 }
 
+void timer_user_fn(void (*fn)(void))
+{
+    user_fn = fn;
+}
+
 void timer_free()
 {
     if (_go32_dpmi_set_protected_mode_interrupt_vector(0x1c, &old_handler) == -1)