1 files changed, 11 insertions, 0 deletions

diff --git a/tmk_core/common/timer.h b/tmk_core/common/timer.h
index fe23f87ae..a8dd85663 100644
--- a/tmk_core/common/timer.h
+++ b/tmk_core/common/timer.h
@@ -19,6 +19,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define TIMER_H 1
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #if defined(__AVR__)
 #include "avr/timer_avr.h"
@@ -46,6 +47,16 @@ uint32_t timer_read32(void);
 uint16_t timer_elapsed(uint16_t last);
 uint32_t timer_elapsed32(uint32_t last);
 
+// Utility functions to check if a future time has expired & autmatically handle time wrapping if checked / reset frequently (half of max value)
+inline bool timer_expired(uint16_t current, uint16_t last)
+{
+    return current - last < 0x8000;
+}
+
+inline bool timer_expired32(uint32_t current, uint32_t future) {
+    return current - future < 0x80000000;
+}
+
 #ifdef __cplusplus
 }
 #endif