diff options
Diffstat (limited to 'tmk_core/common/timer.h')
| -rw-r--r-- | tmk_core/common/timer.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tmk_core/common/timer.h b/tmk_core/common/timer.h index fe23f87aec..a8dd85663f 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 |