add common

1 files changed, 3 insertions, 1 deletions

diff --git a/watch_module_lib.c b/watch_module_lib.c
index a62eb1f..4783c90 100644
--- a/watch_module_lib.c
+++ b/watch_module_lib.c
@@ -83,7 +83,9 @@ int start_hwTimer(unsigned long timeout)
     printk("HWTimer Start\n");
 
     kt = ktime_set(0, (unsigned long)timeout * US2NS); //  us -> ns
-    hrtimer_init(&hr_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+    // CLOCK_MONOTONIC: time since boot | HRTIMER_MODE_REL : relative time
+    hrtimer_init(&hr_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 
+    // mode the same as hrtimer_init
     hrtimer_start(&hr_timer, kt, HRTIMER_MODE_REL);
     hr_timer.function = hrtimer_hander;
     return 0;