ATtiny85 - Initial LED on

main.c

int main()
{
  // Set data direction for Port B bit 0 (PB0 - pin 5) to 1 for output
  DDRB |= (1 << 0);

  // Set data for Port B bit 0 (PB0 - pin 5) to 1 to turn on LED
  PORTB |= (1 << 0);
  
  while (1) {}
}