/*  
  Seven Segment Display

  Aug 17 2024
  Version 2
  by trulyBent, Public Domain

  This project is pretty much a complete rewrite based on a section of
  Koepel's  "Static versus Multiplexed signals for 7-segment displays."
  (https://wokwi.com/projects/397598198000164865)

*/
// #include <Arduino.h>

#define OUT_OFF HIGH
#define OUT_ON  LOW
#define DP 7

int iDigit = 0;
int iValue;
// bool bToggle = false;

const int segmentPins[8] =
{
  5, 6, 7, 8, 9, 10, 11, 12   // A B C D E F G DP
};

// Segment A is in bit 0
// Segment B is in bit 1
// and so on.
const int numbersToSegments[]
{
  0b00111111,   // 0  add dp to numbers
  0b00000110,   // 1
  0b01011011,   // 2 
  0b01001111,   // 3
  0b01100110,   // 4
  0b01101101,   // 5
  0b01111101,   // 6
  0b00000111,   // 7
  0b01111111,   // 8
  0b01100111,   // 9
  0b01110111,   // A  dp off from here
  0b01111111,   // B
  0b00111001,   // C
  0b00001111,   // D  (stylized)
  0b01111001,   // E
  0b01110001,   // F
};
/*
////////////////////////////////////////////
void all_off() {
  for(int i = 0; i < 8; i++)
    digitalWrite(segmentPins[i], OUT_OFF);
}
*/
////////////////////////////////////////////
void setup() {
  Serial.begin(115200);

  // Initialize the pins of the 7 segments
  for(int i = 0; i < 8; i++)
    pinMode(segmentPins[i], OUTPUT);

}
////////////////////////////////////////////
void loop() {
  Serial.println(iDigit);

  for(int segment = 0; segment < 8; segment++) {
    iValue = bitRead(numbersToSegments[iDigit], segment) == 1 ? OUT_ON : OUT_OFF;
    digitalWrite(segmentPins[segment], iValue);
  }

  // to differentiate numbers from letters, add dp to numbers
  if (iDigit <= 9)
    digitalWrite(segmentPins[DP], OUT_ON);
  else
    digitalWrite(segmentPins[DP], OUT_OFF);

  iDigit++;
  if (iDigit > 15)
    iDigit = 0;

    delay(1000);
  // all_off();   // not neccessary
}