/*
    CS 33301
    Project 1-1
    Kent State University
    Derron Ward
*/

#define BIT3_MASK 0x08 // 0000 1000 --> Pin 3
#define BIT5_MASK 0x20 // 0010 0000 --> Pin 5

#define DATAB_MASK 0x25
#define DDRB_MASK 0x24
#define PINB_MASK 0x23

#define DATAD_MASK 0x2B
#define DDRD_MASK 0x2A
#define PIND_MASK 0x29

unsigned char *dataB;
unsigned char *portDDRB;
unsigned char *portPinB;

unsigned char *dataD;
unsigned char *portDDRD;
unsigned char *portPinD;

void setup() {
  // Port B Setup
  portDDRB = (unsigned char *) DDRB_MASK;
  *portDDRB &= ~BIT3_MASK; // Configure pin 3 as input

  dataB = (unsigned char *) DATAB_MASK;
  portPinB = (unsigned char *) PINB_MASK;

  // Port D Setup
  portDDRD = (unsigned char *) DDRD_MASK;
  *portDDRD |= BIT5_MASK; // Configure pin 5 as output

  dataD = (unsigned char *) DATAD_MASK;
  portPinD = (unsigned char *) PIND_MASK;

  *dataD &= ~BIT5_MASK; // LED starts in the off state
}

void loop() {
  // Poll the switch
  if (((*portPinB) & BIT3_MASK) == BIT3_MASK) {
    *dataD |= BIT5_MASK; // Put LED in on state
    delay(2000);
    *dataD &= ~BIT5_MASK; // Put LED in off state
    delay(2000);
  }
}