/* Logic Lab - see http://www.technoblogy.com/show?4FFY

   David Johnson-Davies - www.technoblogy.com - 18th May 2023
   AVR128DA48 or ATmega4809 @ 4 MHz (internal oscillator; BOD disabled)
   
   CC BY 4.0
   Licensed under a Creative Commons Attribution 4.0 International license: 
   http://creativecommons.org/licenses/by/4.0/
*/

// Gate definitions

enum truthtable_t: uint8_t { AND = 0b1000, NAND = 0b0111,  OR = 0b1110, 
                             NOR = 0b0001,  XOR = 0b0110, NOT = 0b0011 };

typedef struct {
  int inputa;
  int inputb;
  int output;
  truthtable_t truthtable;
} gate_t;

gate_t gates[12] = {
  { PIN_PC1, PIN_PC0, PIN_PC5, AND },
  { PIN_PB5, PIN_PB4, PIN_PC4, AND },
  { PIN_PB1, PIN_PB0, PIN_PA3, NAND },
  { PIN_PA6, PIN_PA7, PIN_PA2, NAND },
  { PIN_PC7, PIN_PC6, PIN_PD2, OR },
  { PIN_PC3, PIN_PC2, PIN_PD3, OR },
  { PIN_PA5, PIN_PA4, PIN_PF2, NOR },
  { PIN_PA1, PIN_PA0, PIN_PF3, NOR },
  { PIN_PD4, PIN_PD5, PIN_PE0, XOR },
  { PIN_PD6, PIN_PD7, PIN_PE1, XOR },
  { PIN_PF0, PIN_PF0, PIN_PE2, NOT },
  { PIN_PF1, PIN_PF1, PIN_PE3, NOT },
};

// Setup **********************************************

void setup () {
  // Set outputs
  for (int i=0; i<12; i++) {
    pinMode(gates[i].output, OUTPUT);
  }
}

void loop () {
  for (int i=0; i<12; i++) {
    gate_t gate = gates[i];
    bool ina = digitalRead(gate.inputa);
    bool inb = digitalRead(gate.inputb);
    int val = ina << 1 | inb;
    bool out = (gate.truthtable >> val) & 1;
    digitalWrite(gate.output, out);
  }
}