/*

#################################
||                             ||
||           Title:            ||
||   Extended Binary Counter   ||
||         on two 595          ||
||       Shift Registers       ||
||                             ||
||            Name:            ||
||           GC1CEO            ||
||                             ||
||            Date:            ||
||         09/19/2024          ||
||                             ||
||        Adapted from:        ||
||                             ||
||  shiftOutCode, Hello World  ||
||       By: Carlyn Maw,       ||
||  Tom Igoe, David A. Mellis  ||
||      Date: 23 Mar 2010      ||
||                             ||
||        Description:         ||
||                             ||
||This extended binary counter ||
|| counts from 0 to 65,535 in  ||
||binary on 8 outputs nominally||
||    connected to 8 LEDs.     ||
||                             ||
#################################

*/

//Pin connected to ST_CP (Storage Clock / Latch) of 74HC595
int latchPin = 8;
//Pin connected to SH_CP (Shift Clock) of 74HC595
int clockPin = 12;
////Pin connected to DS / SER (Data/Serial Input) of 74HC595
int dataPin = 11;
////Pin connected to inverted MR / SRCLR (Master Reset / Serial Register Clear) of 74HC595
int resetPin = 10;
////Pin connected to inverted OE (Output Enable) of 74HC595
int oePin = 9;

// delay between each number (in ms)
int delayTime = 100;

void setup() {
Serial.begin(115200);
//set pins to output so you can control the shift register and setting button and pot pins to INPUT
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
pinMode(resetPin, OUTPUT);
pinMode(oePin, OUTPUT);

// Setting reset to HIGH to stop reset and setting output enable to LOW to always enable output
digitalWrite(resetPin, HIGH);
digitalWrite(oePin, LOW);

// Cleaning up serial monitor and announcing program has initalized and going to loop
for(int a = 0; a < 25; a++){
  Serial.println();
}
}
void loop() {
// count from 0 to 65,535 and display the number
// on the LEDs
Serial.print("Counting from 0 to 65,535!");
Serial.println();

// for loop to count from 0 to 65535
for (int numberToDisplay = 0; numberToDisplay < 65535; numberToDisplay++) {

shiftOut(dataPin, clockPin, MSBFIRST, (numberToDisplay >> 8));
  shiftOut(dataPin, clockPin, MSBFIRST, numberToDisplay);

  
// set the latch pin to low so LEDs dont change during shift

digitalWrite(latchPin, LOW);
// shift out the bits:
//shiftOut(dataPin, clockPin, MSBFIRST, numberToDisplay);
//take the latch pin high so the LEDs will light up:
digitalWrite(latchPin, HIGH);
//print the number to serial

Serial.print(String(numberToDisplay) + " ");

// new line every 5 counts (and after the initial 0)
if(numberToDisplay % 5 == 0) { Serial.println("");}

// pause before next value
delay(delayTime);
}

// Announcement that count has finished and is now restarting

Serial.print("Count finished! Restarting!");
Serial.println();
}