[Driver] Add API to support insertion of us_timestamp_t in TimerEvent.

Author: pan-

drivers/TimerEvent.cpp

@@ -44,6 +44,10 @@ void TimerEvent::insert(timestamp_t timestamp) {
     ticker_insert_event(_ticker_data, &event, timestamp, (uint32_t)this);
 }
 
+void TimerEvent::insert_absolute(us_timestamp_t timestamp) {
+    ticker_insert_event(_ticker_data, &event, timestamp, (uint32_t)this);
+}
+
 void TimerEvent::remove() {
     ticker_remove_event(_ticker_data, &event);
 }

drivers/TimerEvent.h

@@ -44,9 +44,12 @@ class TimerEvent {
     // The handler called to service the timer event of the derived class
     virtual void handler() = 0;
 
-    // insert in to linked list
+    // insert relative timestamp in to linked list
     void insert(timestamp_t timestamp);
 
+    // insert absolute timestamp into linked list
+    void insert_absolute(us_timestamp_t timestamp);
+
     // remove from linked list, if in it
     void remove();