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-rw-r--r--tmk_core/common/timer.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/tmk_core/common/timer.h b/tmk_core/common/timer.h
index bbaae109d..117b41d1b 100644
--- a/tmk_core/common/timer.h
+++ b/tmk_core/common/timer.h
@@ -25,7 +25,10 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
# include "avr/timer_avr.h"
#endif
-#define TIMER_DIFF(a, b, max) ((a) >= (b) ? (a) - (b) : (max) - (b) + (a))
+#define TIMER_DIFF(a, b, max) ((max == UINT8_MAX) ? ((uint8_t)((a)-(b))) : ( \
+ (max == UINT16_MAX) ? ((uint16_t)((a)-(b))) : ( \
+ (max == UINT32_MAX) ? ((uint32_t)((a)-(b))) : ( \
+ (a) >= (b) ? (a) - (b) : (max) + 1 - (b) + (a) ))))
#define TIMER_DIFF_8(a, b) TIMER_DIFF(a, b, UINT8_MAX)
#define TIMER_DIFF_16(a, b) TIMER_DIFF(a, b, UINT16_MAX)
#define TIMER_DIFF_32(a, b) TIMER_DIFF(a, b, UINT32_MAX)