/* #define EMUL 1 */

#define byte unsigned char
#define word unsigned int

#define START_TIMER	outp(0x02, TCCR1B)	
#define STOP_TIMER	outp(0x00, TCCR1B)
#define ENABLE_TINT_EMU	outp((1<<TOIE0)|(1<<TOIE1)|(1<<OCIE1A)|(1<<OCIE1B), TIMSK)
#define ENABLE_TIM_INT  outp((1<<TOIE1)|(1<<OCIE1A)|(1<<OCIE1B), TIMSK)

/* events */

#define START_DAYBREAK  0	/* inizio alba */
#define ZONE2_OFF       5
#define ZONE3_OFF       10
#define START_DAY       15	/* inizio giorno */
#define START_SUNSET    50	/* inizio tramonto */
#define ZONE1_ON        60
#define START_NIGHT     65	/* inizio notte */
#define ZONE2_ON        70
#define ZONE3_ON        75
#define ZONE1_OFF       95

/* bit values */

#define OFF             0
#define ON              1

/* commands */

#define CHA_OFF         0
#define CHA_ON          1
#define SET_SCALE       2
#define DAYBREAK_ON     3
#define DAY_ON          4
#define SUNSET_ON       5
#define NIGHT_ON        6
#define FIRE_ON         7

/* dimmer states - used only to vary the light level */

#define DIMMER_OFF      0
#define DAYBREAK_STATE  1
#define DAY_STATE       2
#define SUNSET_STATE    3
#define NIGHT_STATE     4

/* Output channels are located to PortA */

#define FIRE_CH		0
#define ZONE1_CH	1
#define ZONE2_CH	2
#define ZONE3_CH	3
#define NIGHT_CH	4
#define SUNSET_CH	5
#define DAY_CH		6
#define DAYBREAK_CH	7

/* Dip switches are located to PortB */

#define MASTER		7

/* Other I/O are located to PortC */

#define MAINS		2
#define TEST		5
#define LED		6
#define TEST_OUT	0

/* direction 

if UP   then OC1A inc and OC1B dec
if DOWN then OC1A dec and OC1B dec

*/

#define UP		1
#define DOWN		0

/* */

#define POS_EDGE	1
#define NEG_EDGE	0
#define PMAX		10	/* filter */

/* end_pulse define */

#define END_PULSE_DAYBREAK	0x6F
#define END_PULSE_DAY		0x3F
#define END_PULSE_SUNSET	0x9F
#define END_PULSE_NIGHT		0xCF	

/* BAUD RATE - fc = 8,000,000 MHz - 0.2% error */
	
#define BR2400		207		
#define BR4800		103
#define BR9600		51
#define	BR19200		25
#define BR38400		12

/* function prototypes */

void init_ports(void);
void init_vars(void);
void init_com(void);
void init_timer(void);
int is_char_av(void);
void init(void);
void setup_dimmer(byte);
void stop_dimmer(void);
int is_remainder(void);
void update_dimmer(void);
void check_for_command(void);
void get_scale(void);
void get_keys(void);
void do_choff(byte);
void do_chon(byte);
void do_setscale(byte);
void do_rand(byte);
void events(void);
void wait_neg_edge(void);
void wait_pos_edge(void);
void dimmer_handler(void);
void trigger(void);
void scheduler(void);
byte is_odd_parity(byte);
void rand8(void);