/*
  Binary to 7 segment decoder
  AnonEngineering 11/14/25
*/

#include "segment_lookup.h"

// define pins
const int SEG_PINS[8] = {13, 12, 6, 9, 8, 10, 11, 7}; // (A to G, DP)
const int SW_PINS[]  = {5, 4, 3, 2};  // MSB > LSB

int oldValue = -1;

int getValue()  {
  int value = 0;

  for (int bitNum = 0; bitNum < 4; bitNum++) {
    int bitVal = !digitalRead(SW_PINS[bitNum]); // ! inverts state
    value += bitVal << (3 - bitNum);  // MSB
  }
  return value;
}

void showDigit(int num) {
  for (int i = 0; i < 8; i++) {
    digitalWrite(SEG_PINS[i], SEGMENTS[num][i]);
  }
}

void setup() {
  Serial.begin(115200);
  for (int i = 0; i < 8; i++) {
    pinMode(SEG_PINS[i], OUTPUT);
  }
  for (int i = 0; i < 4; i++) {
    pinMode(SW_PINS[i], INPUT_PULLUP);
  }
}

void loop() {
  int value = getValue();
  if (value != oldValue)  {
    Serial.print("Value: ");
    Serial.println(value);
    oldValue = value;
  }
  // this must be called frequently
  showDigit(value);
}