attiny13 toggle pin deepsleep foo

main.c

#include <avr/sleep.h>
#include <util/delay.h>
#include <avr/pgmspace.h>

#define _UV(x) (1 << (x))
#define _SETBIT(x, y) ((x) |= _UV(y))
#define _CLRBIT(x, y) ((x) &= ~_UV(y))
#define _GETBIT(d, x) (d & ( 1 << x )) >> x

#include <avr/interrupt.h>
#include <avr/sleep.h>

int state = 0;

void sleep() 
{ 
  GIMSK |= _BV(PCIE); // Enable Pin Change Interrupts 
  PCMSK |= _BV(PCINT2); // Use PB2 as interrupt pin 
  ADCSRA &= ~_BV(ADEN); // ADC off 
  MCUCR |= _BV(SM1); MCUCR &= ~_BV(SM0); // Select "Power-down" sleep mode

  sleep_enable(); // Sets the Sleep Enable bit in the MCUCR Register (SE BIT) 

  sei(); // Enable interrupts 
  sleep_cpu(); // SLEEP 
  
  cli(); // Disable interrupts 
  PCMSK &= ~_BV(PCINT2); // Turn off PB2 as interrupt pin 
  sleep_disable(); // Clear SE bit 
  ADCSRA |= _BV(ADEN); // ADC on 
  
  sei(); // Enable interrupts 
} 

ISR(INT0_vect) { 
  asm("nop"); 
}
ISR(PCINT0_vect){
  asm("nop");
}

int main(void) {
  // Set up Port B pin 4 mode to output
  DDRB = _UV(DDB4);

  sei(); // Enable global interrupts 

  while(1){
    if(_GETBIT(PINB,2)){
      if(state){
        state=0;
        _CLRBIT(PORTB,4);
      }else{
        state=1;
        _SETBIT(PORTB,4);
      }
      _delay_ms(500);
    }
    sleep();
  }
}

Makefile

MCU=attiny13
MCUFREQ=-DF_CPU=1000000L
PROGTYPE=stk500v1
SOURCES=main.c
TARGET=main

.PHONY: build upload

build: $(TARGET).hex

upload: build
	avrdude -p $(MCU) -c $(PROGTYPE) -b 19200 -P /dev/tty.usbserial-A600epyy -U flash:w:$(TARGET).hex -U lfuse:w:0x6a:m -U hfuse:w:0xff:m

$(TARGET).elf: $(SOURCES) Makefile
	avr-gcc $(MCUFREQ) -Os -o $@ -mmcu=$(MCU) $(SOURCES)
        
$(TARGET).hex: $(TARGET).elf Makefile
	avr-objcopy -O ihex -R .eeprom $< $@