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495 kaklik 1 
/*********************************************
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* vim: set sw=8 ts=8 si :
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* Author: Guido Socher, Copyright: GPL
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* This program is to test the led connected to
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* PC5.
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* See http://linuxfocus.org/English/November2004/
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* for details.
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* Chip type           : ATMEGA644
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* Clock frequency     : Internal clock 1 Mhz (factory default)
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*********************************************/
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#include <avr/io.h>
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#include <inttypes.h>
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#define F_CPU 1000000UL  // 1 MHz
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#include <util/delay.h>
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/* compatibilty macros for old style */
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#ifndef cbi
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#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
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#endif
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#ifndef sbi
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#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
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#endif
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void delay_ms(unsigned int ms)
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/* delay for a minimum of <ms> */
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{
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	// we use a calibrated macro. This is more
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	// accurate and not so much compiler dependent
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	// as self made code.
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	while(ms){
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		_delay_ms(0.96);
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		ms--;
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	}
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}
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/* new style */
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int main(void)
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{
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          /* INITIALIZE */
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          /* enable PC5 as output */
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          DDRC|= (1<<DDC5);
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          /* PC5 is 5 (see file include/avr/iom8.h) and 1<<PC5 is 00100000
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	   * This can also be written as _BV(PC5)*/
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          while (1) {
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                      /* led on, pin=0 */
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                      PORTC &= ~(1<<PC5);
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                      delay_ms(100);
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                      /* set output to 5V, LED off */
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                      PORTC|= (1<<PC5);
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                      delay_ms(1000);
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          }
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	  return(0);
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}
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// // old style now depricated:
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// int main(void)
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// {
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// 	// enable  PC5 as output
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// 	sbi(DDRC,PC5);
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// 	while (1) {
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// 		// led on, pin=0
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// 		cbi(PORTC,PC5);
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// 		delay_ms(500);
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// 		// set output to 5V, LED off
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// 		sbi(PORTC,PC5);
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// 		delay_ms(500);
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// 	}
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// 	return(0);
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// }
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// // end of old style