blink 3 leds attached to the nerd kit

blink3leds.c

// led_blink.c
// for NerdKits with ATmega168
// [email protected]

#define F_CPU 14745600

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <inttypes.h>

#include "../libnerdkits/delay.h"
#include "../libnerdkits/lcd.h"
#include <math.h>

// PIN DEFINITIONS:
//
// PC4 -- LED anode

int main() {
  lcd_init();
  FILE lcd_stream = FDEV_SETUP_STREAM(lcd_putchar, 0, _FDEV_SETUP_WRITE);
  lcd_home();
  lcd_write_string(PSTR("Hello LED!"));
  // LED as output
  DDRC |= (1<<PC4); // green LED
  DDRC |= (1<<PC5); // red LED
  DDRC |= (1<<PC3); // yellow LED

  // turn on LEDs
  PORTC |= (1<<PC4);
  PORTC |= (1<<PC5);
  PORTC |= (1<<PC3);  
  // loop keeps looking forever
  int i;
  for (i=1;i>=0;i++,delay_ms(300)) {
    lcd_clear_and_home();
    lcd_write_string(PSTR("Hello LED!"));
    lcd_line_two();
    if (i % 3 == 0) {
     lcd_write_string(PSTR("Toggle yellow"));
     PORTC ^= (1<<PC3);
    }
    else if (i % 2 == 0) {
     lcd_write_string(PSTR("Toggle red   "));
     PORTC ^= (1<<PC5);
    }
    else if (i % 1 == 0) {
     lcd_write_string(PSTR("Toggle green "));
     PORTC ^= (1<<PC4);
    }     
  }  
  return 0;
}