timer.h

   1 #ifndef TIMER_H
   2 #define TIMER_H 1
   3
   4 #include <stdint.h>
   5
   6 #define TIMER_DIFF(a, b) ((a) >= (b) ?  (a) - (b) : UINT16_MAX - (b) + (a))
   7
   8
   9 extern volatile uint16_t timer_count;
  10
  11
  12 void timer_init(void);
  13 void timer_clear(void);
  14 uint16_t timer_read(void);
  15 uint16_t timer_elapsed(uint16_t last);
  16
  17 #endif