systick.h

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#ifndef SYSTICK_H_
#define SYSTICK_H_
 
    #include <util/atomic.h>
    
    enum SYSTICK_Timer_Status_t
    {
        SYSTICK_Timer_Running = 0,  
        SYSTICK_Timer_Expired       
    };

    typedef enum SYSTICK_Timer_Status_t SYSTICK_Timer_Status;
    
    struct SYSTICK_Timer_t
    {
        unsigned int expire;      
        SYSTICK_Timer_Status status; 
    };

    typedef struct SYSTICK_Timer_t SYSTICK_Timer;
    
            void systick_init(void);
            void systick_reset(void);
            void systick_tick(void);
    unsigned int systick_current(void);
    
                    void systick_timer_set(SYSTICK_Timer *timer, unsigned int delay_ticks);
    SYSTICK_Timer_Status systick_timer_elapsed(SYSTICK_Timer *timer);
            unsigned int systick_timer_remaining(SYSTICK_Timer *timer);
                    void systick_timer_wait(unsigned int ticks);
                    void systick_timer_wait_ms(unsigned int ms);
                    void systick_timer_wait_us(unsigned int us);
                    void systick_timer_cancel(SYSTICK_Timer *timer);
 
#endif /* SYSTICK_H_ */