Add timer wait

2 files changed, 12 insertions, 1 deletions

diff --git a/src/timer.c b/src/timer.c
index 73675dc..d7810b6 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -3,14 +3,15 @@
 #include <go32.h>
 #include <dpmi.h>
 
-/* updates 18.2 times per second by default */
 volatile uint32_t ticks = 0;
+volatile static uint32_t ticks_to = 0;
 
 static _go32_dpmi_seginfo old_handler, new_handler;
 
 static void timer_handler()
 {
     ticks++;
+    ticks_to++;
 }
 
 void timer_init()
@@ -26,3 +27,9 @@ void timer_free()
     if (_go32_dpmi_set_protected_mode_interrupt_vector(0x1c, &old_handler) == -1)
         fprintf(stderr, "Failed to free the timer :(\n");
 }
+
+void timer_wait(uint8_t t)
+{
+    while (ticks_to < t);
+    ticks_to = 0;
+}
diff --git a/src/timer.h b/src/timer.h
index 22ef6d2..8ae7e60 100644
--- a/src/timer.h
+++ b/src/timer.h
@@ -1,9 +1,13 @@
 #ifndef _TIMER_H
 #define _TIMER_H
 
+/* updates 18.2 times per second */
 extern volatile uint32_t ticks;
 
 void timer_init();
 void timer_free();
 
+/* each t is 54.9254 ms */
+void timer_wait(uint8_t t);
+
 #endif /* _TIMER_H */