//

// Toggle ATTiny85 (Toggle PORTB.PB4, pin 3)

//

// +-\/-+

// RESET / PB5 1 | | 8 Vcc

// CLKI / PB3 2 | | 7 PB2 / SCK

// CLK) / PB4 3 | | 6 PB1 / MISO

// Gnd 4 | | 5 PB0 / MOSI

// +----+

#include "Arduino.h"

#define LEDBIT (1 << 4) // PB4 (connected to LED to ground via 330 ohm resistor

#define INBIT (1 << 3) // PB3 (connected to pushbutton switch to gnd)

void setup() {

DDRB = LEDBIT; // Set PB4 as output, all others as inputs

PORTB = INBIT; // Set pullups on input pin PB3

}

void loop() {

while (true) {

PORTB |= LEDBIT; // Turn the LED On

delay(250);

PORTB &= ~LEDBIT; // Turn the LED Off

delay(250);

if ((PINB & INBIT) == 0) { // Check if switch pressed

__asm__ ("break\n\t"); // If so, return control to debugger

}

}

}