Use volatile

The parameter is used on the interrupt.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/timer.c b/src/timer.c
index ae76037..f3c5898 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -45,7 +45,7 @@ void timer_free()
         fprintf(stderr, "Failed to free the timer :(\n");
 }
 
-void timer_start(uint8_t secs, uint8_t *updated)
+void timer_start(uint8_t secs, volatile uint8_t *updated)
 {
     *updated = 0;
     clock_updated = updated;
diff --git a/src/timer.h b/src/timer.h
index 3f66be5..8207e5b 100644
--- a/src/timer.h
+++ b/src/timer.h
@@ -8,7 +8,7 @@ void timer_init();
 void timer_free();
 
 /* countdown clock */
-void timer_start(uint8_t secs, uint8_t *updated);
+void timer_start(uint8_t secs, volatile uint8_t *updated);
 uint8_t timer_value();
 void timer_stop();
 void timer_resume();