/*
  7 segment with serial input
  https://forum.arduino.cc/t/serial-input-basics-updated/382007
*/

#include "SevSeg.h"

const byte numChars = 32;

char receivedChars[numChars];   // an array to store the received data
boolean newData = false;

SevSeg sevseg; // Instantiate a seven segment controller object

void recvWithEndMarker() {
  static byte ndx = 0;
  char endMarker = '\n';
  char rc;

  while (Serial.available() > 0 && newData == false) {
    rc = Serial.read();
    if (rc != endMarker) {
      receivedChars[ndx] = rc;
      ndx++;
      if (ndx >= numChars) {
        ndx = numChars - 1;
      }
    } else {
      receivedChars[ndx] = '\0'; // terminate the string
      ndx = 0;
      newData = true;
    }
  }
}

void showNewData() {
  if (newData == true) {
    Serial.print("This just in ... ");
    Serial.println(receivedChars);
    sevseg.setChars(receivedChars);
    newData = false;
  }
}

void setup() {
  Serial.begin(9600);
  byte numDigits = 4;
  byte digitPins[] = {2, 5, 6, 8};
  byte segmentPins[] = {3, 7, 10, 12, 13, 4, 9, 11};
  bool resistorsOnSegments = true;   // 'false' means resistors are on digit pins
  byte hardwareConfig = COMMON_ANODE; // See README.md for options
  bool updateWithDelays = false;     // Default 'false' is Recommended
  bool leadingZeros = false;         // Use 'true' if you'd like to keep the leading zeros
  bool disableDecPoint = false;      // Use 'true' if your decimal point doesn't exist or isn't connected
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments,
               updateWithDelays, leadingZeros, disableDecPoint);
  sevseg.setBrightness(90);
  // Set initial display text
  sevseg.setChars("----");
  Serial.println("Ready");
}

void loop() {
  recvWithEndMarker();
  showNewData();
  // Must run frequently
  sevseg.refreshDisplay();
}