#include <ShiftRegister74HC595.h>

// Shift register Pin definitions
#define DS_PIN 4    // DS - Pin 04
#define STCP_PIN 3  // STCP - PIN 03
#define SHCP_PIN 2  // SHCP - PIN 02

// Create instances of ShiftRegister74HC595 for each shift register with size
ShiftRegister74HC595<24> sr(DS_PIN, SHCP_PIN, STCP_PIN);

// Define segment mapping for each display
int segMapDisplay1[7] = {0, 1, 2, 3, 4, 5, 6};    // A-G Segment mapping for Display 1
int segMapDisplay2[7] = {7, 8, 9, 10, 11, 12, 13}; // A-G Segment mapping for Display 2
int segDecimalPoints[7] = {22, 23};               // Segment mapping for Decimal Point

// Pin Definitions for 4-digit 7-segment display
const int segDataLine1[4] = {14, 15, 16, 17}; // First 4-Digit 7-Segment Display (Display 1). Pins for each digit (D1-D4)
const int segDataLine2[4] = {18, 19, 20, 21}; // Second 4-Digit 7-Segment Display (Display 2). Pins for each digit (D1-D4)

// Digit patterns for common cathode display (with decimal points)
const byte digitPatterns[10] = {
  B00111111, // Digit 0
  B00000110, // Digit 1
  B01011011, // Digit 2
  B01001111, // Digit 3
  B01100110, // Digit 4
  B01101101, // Digit 5
  B01111101, // Digit 6
  B00000111, // Digit 7
  B01111111, // Digit 8
  B01101111  // Digit 9
};

void setup() {
  // Initialize shift register pins as outputs
  for (int i = 0; i < 4; i++) {
    pinMode(segDataLine1[i], OUTPUT);
    pinMode(segDataLine2[i], OUTPUT);
  }
}

void loop() {
  // Display numbers 1 to 8 on the two 4-digit displays
  for (int i = 1; i <= 9; i++) {
    displayNumber(i, segDataLine1); // Display on first 4-digit display
    delay(1000); // Delay for 1 second
    displayNumber(i, segDataLine2); // Display on second 4-digit display
    delay(1000); // Delay for 1 second
  }
}

void displayNumber(int number, const int* segDataLine) {
  byte pattern = digitPatterns[number];
  sr.setAllLow(); // Set all segments to low initially (turn off)
  
  // Set the segments according to the pattern
  for (int i = 0; i < 7; i++) {
    sr.set(segMapDisplay1[i], bitRead(pattern, i));
    sr.set(segMapDisplay2[i], bitRead(pattern, i));
  }
  
  // Output the pattern to the corresponding display's segment lines
  for (int i = 0; i < 4; i++) {
    digitalWrite(segDataLine[i], bitRead(pattern, i));
  }
  
  sr.updateRegisters(); // Update the shift registers with the new data
}