Added function to get the timestamp of the next us_ticker event.

Author: jeremybrodt

libraries/mbed/common/us_ticker_api.c

@@ -116,3 +116,7 @@ void us_ticker_remove_event(ticker_event_t *obj) {
 
     __enable_irq();
 }
+
+timestamp_t us_ticker_get_next_timestamp(void) {
+    return head->timestamp;
+}

libraries/mbed/hal/us_ticker_api.h

@@ -43,6 +43,7 @@ void us_ticker_irq_handler(void);
 
 void us_ticker_insert_event(ticker_event_t *obj, timestamp_t timestamp, uint32_t id);
 void us_ticker_remove_event(ticker_event_t *obj);
+timestamp_t us_ticker_get_next_timestamp(void);
 
 #ifdef __cplusplus
 }