arm9/source/devices/clock.h


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#ifndef CLOCK_H_
    #define CLOCK_H_

    #include <time.h>
    #include "../bang.h"


    // A 16-bit countdown timer.
    typedef struct {
        u32 end;            // End time as an uptime value, zero if inactive
        u16 read, write;    // Read write caches for remaining duration
    } ClockTimer;

    // Bedrock clock device.
    typedef struct {
        ClockTimer t1, t2, t3, t4;  // Timers
        u16 uptime;                 // Read cache for uptime
        u32 start;                  // Uptime offset
    } ClockDevice;

    // Extract fields from a tm struct.
    #define   YEAR(tm) (tm->tm_year - 100)
    #define  MONTH(tm) (tm->tm_mon)
    #define    DAY(tm) (tm->tm_mday - 1)
    #define   HOUR(tm) (tm->tm_hour)
    #define MINUTE(tm) (tm->tm_min)
    #define SECOND(tm) (tm->tm_sec)

    // Functions.
    void init_nds_clock(void);
    struct tm* get_datetime(void);

    // Timer methods.
    void timer_read(ClockTimer *timer);
    void timer_write(ClockTimer *timer);

    // Clock methods.
    void clock_reset(ClockDevice *clock);
    void clock_uptime_read(ClockDevice *clock);
    bool clock_check_timers(ClockDevice *clock);
#endif