/*,-----------------------------------------------------------------------------------------.| io/clock|-----------------------------------------------------------------------------------------| this file implements a very basic clock| - use 7.3728 Mhz Clock -> /1024/7200 = 1s clock| - enables global interrupts (sei()) !| - interrupt routine is small, need to call clock_do() |   to recalc the time at least every 255 seconds ! (call it ~ every second!)|| Author   : {{removed according to contest rules}}|            -> circuitcellar.com avr design contest 2006|            -> Entry #AT2616||-----------------------------------------------------------------------------------------| License:| This program is free software; you can redistribute it and/or modify it under| the terms of the GNU General Public License as published by the Free Software| Foundation; either version 2 of the License, or (at your option) any later| version.| This program is distributed in the hope that it will be useful, but|| WITHOUT ANY WARRANTY;|| without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR| PURPOSE. See the GNU General Public License for more details.|| You should have received a copy of the GNU General Public License along with| this program; if not, write to the Free Software Foundation, Inc., 51| Franklin St, Fifth Floor, Boston, MA 02110, USA|| http://www.gnu.de/gpl-ger.html`-----------------------------------------------------------------------------------------*/#include "clock.h"//ACTIVATE DEBUG by editing this file:#include "debug.h"//clock (hour,min,sec)unsigned char clock[3];//count how many interrupts passed since last clock_do() callvolatile unsigned char clock_intcount;//stores the nes second/minute flagvolatile unsigned char clock_new_flag;//used as a timer for uart io (mca25) for examplevolatile unsigned char clock_timeout_timer;void clock_init(){	clock_new_flag=0; 	//enable interrupt:	timer_enable_int(_BV(TOIE1));	//init clock:	clock[CLOCK_SEC]  = 0;	clock[CLOCK_MIN]  = 0;	clock[CLOCK_HOUR] = 0;	clock_timeout_timer = 0;	clock_intcount = 0;	//set prescaler to 1024	TCCR1B |= (1<<CS10 | 0<<CS11 | 1<<CS12);	TCNT1 = CLOCK_TCNT;		//interrups enable	sei();	#if CLOCK_DEBUG	softuart_puts_progmem("CLK : init done.\r\n");	#endif}//timer overflow interrupt:SIGNAL (SIG_OVERFLOW1){	//set timer again:	TCNT1 = CLOCK_TCNT;	clock_intcount++;	if (clock_timeout_timer>0)		clock_timeout_timer--;	//set new second flag:	clock_new_flag |= (1<<CLOCK_SEC);}//timer isr needs to be as short as possible (uart 460kbaud!!)//-> do the clock calc here, assumes that we call clock_do() at least every 60 seconds//   if you need the correct time, always call clock_do() before using the clock[] arrayvoid clock_do(void){	unsigned char new_secs;	new_secs = clock_intcount;	if (new_secs > 0){		clock_intcount = clock_intcount - new_secs;		//increase clock:		clock[CLOCK_SEC] += new_secs;		if (clock[CLOCK_SEC] >= 60){			clock[CLOCK_MIN] += clock[CLOCK_SEC]/60;			clock[CLOCK_SEC]  = clock[CLOCK_SEC]%60;					//new minute flag			clock_new_flag |= (1<<CLOCK_MIN);		}		if (clock[CLOCK_MIN] >= 60){			clock[CLOCK_HOUR] += clock[CLOCK_MIN]/60;			clock[CLOCK_MIN]   = clock[CLOCK_MIN]%60;						//new hour flag:			clock_new_flag |= (1<<CLOCK_HOUR);		}					if (clock[CLOCK_HOUR] >= 24){			clock[CLOCK_HOUR] = 0;		}		#if CLOCK_DEBUG		softuart_puts_progmem("CLK : added ");		softuart_put_uint8(new_secs);		softuart_puts_progmem("s -> ");		softuart_put_uint8(clock[CLOCK_HOUR]);	  softuart_putc(':');		softuart_put_uint8(clock[CLOCK_MIN]);	    softuart_putc(':');		softuart_put_uint8(clock[CLOCK_SEC]);		softuart_putnewline();		#endif	}}