#include <Arduino.h>

enum Pin : unsigned char {
    CLOCK = 2,
    BUS_0 = 3,
    BUS_1 = 4,
    BUS_2 = 5,
    BUS_3 = 6,
    BUS_4 = 7,
    BUS_5 = 8,
    BUS_6 = 9,
    BUS_7 = 10,
    LOAD = 11,
    ENABLE = 12
};

const uint8_t bus[8] = {
    Pin::BUS_0,
    Pin::BUS_1,
    Pin::BUS_2,
    Pin::BUS_3,
    Pin::BUS_4,
    Pin::BUS_5,
    Pin::BUS_6,
    Pin::BUS_7
};

void setup() {

    pinMode(Pin::CLOCK, OUTPUT);
    digitalWrite(Pin::CLOCK, LOW);
    pinMode(Pin::LOAD, OUTPUT);
    digitalWrite(Pin::LOAD, HIGH);
    pinMode(Pin::ENABLE, OUTPUT);
    digitalWrite(Pin::ENABLE, HIGH);

    for (size_t it = 0; it < sizeof(bus); it++) {
        pinMode(bus[it], OUTPUT);
        digitalWrite(bus[it], LOW);
    }
}

void loop() {
    delay(5000);
    for (uint8_t n = 0; n < 0xFF; n++) {

        // Write 8 bits to bus
        digitalWrite(Pin::CLOCK, LOW);
        digitalWrite(Pin::ENABLE, HIGH);
        digitalWrite(Pin::LOAD, LOW);
        for (size_t it = 0; it < sizeof(bus); it++) {
            digitalWrite(bus[it], bitRead(n, it));
        }

        // Pulse clock
        delay(50);
        digitalWrite(Pin::CLOCK, HIGH);
        delay(50);
        digitalWrite(Pin::CLOCK, HIGH);
        digitalWrite(Pin::LOAD, HIGH);
        delay(50);
    }
}