/*********************************************
* vim: set sw=8 ts=8 si :
* Author: Guido Socher, Copyright: GPL 
* This program is to test the led connected to
* PD5. 
* Chip type           : AT90S4433
* Clock frequency     : 4,000000 MHz
*********************************************/
#include <io.h>

void delay_ms(unsigned short ms)
/* delay for a minimum of <ms> */
/* with a 4Mhz crystal, the resolution is 1 ms */
{
	unsigned short outer1, outer2;
     	outer1 = 200; 

    	while (outer1) {
		outer2 = 1000;
		while (outer2) {
			while ( ms ) ms--;
			outer2--;
		}
		outer1--;
	}
}

void main(void)
{
	/* enable  PD5 as output */
	sbi(DDRD,PD5);
	while (1) {
		/* led on, pin=0 */
		cbi(PORTD,PD5);
		delay_ms(500);
		/* set output to 5V, LED off */
		sbi(PORTD,PD5);
		delay_ms(500);
	}
}