drv_hrt: added hrt_call_init() and hrt_call_delay() APIs

hrt_call_init() can be used to initialise (zero) a hrt_call structure
to ensure safe usage. The hrt_call_every() interface calls this
automatically.

hrt_call_delay() can be used to delay a current callout by the given
number of microseconds

1 files changed, 14 insertions, 0 deletions

diff --git a/src/drivers/drv_hrt.h b/src/drivers/drv_hrt.h
index 8a99eeca7..d130d68b3 100644
--- a/src/drivers/drv_hrt.h
+++ b/src/drivers/drv_hrt.h
@@ -142,6 +142,20 @@ __EXPORT extern bool	hrt_called(struct hrt_call *entry);
 __EXPORT extern void	hrt_cancel(struct hrt_call *entry);
 
 /*
+ * initialise a hrt_call structure
+ */
+__EXPORT extern void	hrt_call_init(struct hrt_call *entry);
+
+/*
+ * delay a hrt_call_every() periodic call by the given number of
+ * microseconds. This should be called from within the callout to
+ * cause the callout to be re-scheduled for a later time. The periodic
+ * callouts will then continue from that new base time at the
+ * previously specified period.
+ */
+__EXPORT extern void	hrt_call_delay(struct hrt_call *entry, hrt_abstime delay);
+
+/*
  * Initialise the HRT.
  */
 __EXPORT extern void	hrt_init(void);