/*
   Demonstrates using state to detect button presses
*/

// ------- Preamble -------- //
#include <avr/io.h>
#include "pinDefines.h"

int main(void) {
  // -------- Inits --------- //
  uint8_t buttonWasPressed;                                   /* state */
  BUTTON_PORT |= (1 << BUTTON);     /* enable the pullup on the button */
  LED_DDR = (1 << LED0);                      /* set up LED for output */

  // ------ Event loop ------ //
  while (1) {
    if (bit_is_clear(BUTTON_PIN, BUTTON)) {    /* button is pressed now */
      if (buttonWasPressed == 0) {     /* but wasn't last time through */
        LED_PORT ^= (1 << LED0);                        /* do whatever */
        buttonWasPressed = 1;                      /* update the state */
      }
    }
    else {                                /* button is not pressed now */
      buttonWasPressed = 0;                        /* update the state */
    }
  }                                                  /* End event loop */
  return 0;                            /* This line is never reached */
}