/********************************************************************************
 * MAHE, 13.05.2002, 12H40 - now compiling as project of separated source files
 ********************************************************************************/
#ifndef _TIMER_H
#define _TIMER_H

/***************************************************************
 * Struct for global timer
 * timer1Counter is incremented every overflow of timer1 in ISR, if
 * timer1Counter>N, it is set to 0
 * counter is decremented every N ticks of timer1Counter,
 * Timer1 is incrementing from 0x0000 to 0xFFFF every instruction 
 * cycle by setting the prescaler to 1:1. At f=4MHz ext clock,
 * -> T=0,25µs*4=1µs seconds.
 * 50000=0x3CAF
 * N=0,1s/deltaT, deltaT=50000*T=50000*1µs=50000µs=0,05s
 * N=2
 * isTerminated==1 -> timer terminated
 * !isTerminated && !isRunning -> timer is not active
 * !isTerminated && isRunning  -> timer is running
 ***************************************************************/
struct stru_timer {
  unsigned int timer1Counter; 
  unsigned int counter;       
  char isTerminated;           
  char isRunning;
  unsigned int N;
};
typedef struct stru_timer Timer;
#define TMR1_MSB_RELOAD 0x3C
#define TMR1_LSB_RELOAD 0xAF
#define GLOBAL_TIMER_N  2

void initTimer1(void);
void startTimer1(void);
void stopTimer1(void);
void startGlobalTimer(unsigned int);
char isFinishedGlobalTimer(void);

#endif /* of _TIMER_H */