#ifndef TIMER_PRESCALER
# if F_CPU > 16000000
# define TIMER_PRESCALER 256
-# elif F_CPU >= 4000000
+# elif F_CPU > 2000000
# define TIMER_PRESCALER 64
-# else
+# elif F_CPU > 250000
# define TIMER_PRESCALER 8
+# else
+# define TIMER_PRESCALER 1
# endif
#endif
#define TIMER_RAW_FREQ (F_CPU/TIMER_PRESCALER)
#define TIMER_DIFF_MS(a, b) TIMER_DIFF(a, b, UINT16_MAX)
+#ifdef __cplusplus
+extern "C" {
+#endif
extern volatile uint16_t timer_count;
void timer_clear(void);
uint16_t timer_read(void);
uint16_t timer_elapsed(uint16_t last);
+#ifdef __cplusplus
+}
+#endif
#endif