timer.h

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#ifndef TIMER_H
#define TIMER_H

#define TIMER_PORT      0x40     // I/O port base for 8254  
#define TIMER0          0x40     // I/O port for timer 0   
#define TIMER1          0x41     // I/O port for timer 1   
#define TIMER2          0x42     // I/O port for timer 2  
#define TIMER_MODE      0x43     // I/O port for timer mode control   

#define RATE_GENERATOR  0x34     // timer 0,lsb-msb,rate generator,binary   
#define TIMER_FREQ      1193182L // clock frequency for timer in PC AT   
#define HZ              1000     // 1000hz, divider=TIMER_FREQ/1000~1200

typedef struct{
    U16 Timer;
    U16 TaskTick;
}TIMER_CONTROL;

extern TIMER_CONTROL TimerCtrl;

void TimerInit(void);
void TimerHandler(void);

#endif

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