#include <avr/io.h>
#include <util/delay.h>

#define output(directions,pin) (directions |= pin) // set port direction for output
#define set(port,pin) (port |= pin) // set port pin
#define clear(port,pin) (port &= (~pin)) // clear port pin
#define pin_test(pins,pin) (pins & pin) // test for port pin
#define bit_test(byte,bit) (byte & (1 << bit)) // test for bit set
#define PWM_delay() _delay_us(25) // PWM delay

#define led_portB PORTB
#define led_portA PORTA
#define led_directionB DDRB
#define led_directionA DDRA
#define red (1 << PB2)
#define green (1 << PA6)
#define blue (1 << PA7)

int main(void) {
   //
   // main
   //
   unsigned char count, pwm;
   //
   // set clock divider to /1
   //
   CLKPR = (1 << CLKPCE);
   CLKPR = (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0);
   //
   // initialize LED pins
   //
   set(led_portB, red);
   output(led_directionB, red);
   set(led_portA, green);
   output(led_directionA, green);
   set(led_portA, blue);
   output(led_directionA, blue);
   //
   // main loop
   //
   while (1) {
  
   //LED BLUE ON/OFF
   clear(led_portA,blue);
   _delay_ms(500);
   set(led_portA,blue);
   _delay_ms(500);

   //LED GREEN ON/OFF 
   clear(led_portA,green);
   _delay_ms(500);
   set(led_portA,green);
   _delay_ms(500);

   //LED RED ON/OFF
   clear(led_portB,red);
   _delay_ms(500);
   set(led_portB,red);
   _delay_ms(500);
   
   }
}