4.3" e-paper picture frame, working with latest IDE

// revised code 02/04/2024 by plouc68000@gmail.com

// add Pro Mini Hardware Reset via pin 7 after last picture
// remove RST to pin 7 connection for upload

// use epd Lib from https://github.com/sabas1080/LibraryEPD 
// because this one makes wake_up and reset redefinable, other Libs use fixed pin 2,3
// this is needed because wakeup interrupt pin MUST be 2 or 3

// correct also attachinterrupt with new syntax

// pins 5 and 6, wake_up and reset must be wired to e-Paper display !!!!!


#include "LowPower.h"

#include "epd.h"

const int res = 7; 

const int wake_up = 6; 

const int reset = 5; 

const int lcd_on = 4;

const int button = 3;

int refreshRate = 2; // 16 seconds for testing, replace by 10800 for 24h  
//10800; //time between loading images. number you enter * 8 = seconds between refresh (10800 = 24h)

int counter = 1;

int refreshCounter = 0;

int ByteReceived;

bool errorFlag = false;

bool picSend = false;

bool picLoaded = false;

bool buttonP() {

  if (digitalRead(button) == HIGH) {

    delay(500);

    return true;

  } else {

    return false;

  }

}

void setup(void)

{

  pinMode(lcd_on, OUTPUT);

  pinMode(13, OUTPUT);

  digitalWrite(7, HIGH);
  pinMode(7, OUTPUT);

  pinMode (buttonP, INPUT);

  digitalWrite(13, LOW);

  //attachInterrupt(1, buttonPr, RISING);// old syntax
  attachInterrupt(digitalPinToInterrupt(button), buttonPr, RISING);// JLG
}

void loop(void) {

  DrawPic();

  counter++;

}

void buttonPr() {

  refreshCounter = refreshRate;

  wakeUp();

}

void wakeUp() {

  refreshCounter++;

  if (refreshCounter < refreshRate ) enterSleep();

}

void DrawPic() {

  digitalWrite(13, LOW);

  //delay(2000);

  digitalWrite(lcd_on, HIGH);

  delay(300);

  epd_init(wake_up,reset); 

  epd_wakeup(wake_up);

  epd_set_memory(MEM_TF);

  epd_clear();

  digitalWrite(13, HIGH);

  //int index = 7;

  String indexStr = String(counter);

  String str = 'I' + indexStr + ".BMP ";

  char character[str.length()] ;

  str.toCharArray(character, str.length());

  epd_disp_bitmap(character, 0, 0);

  epd_udpate();

  epd_enter_stopmode();

  while (1) {

    ByteReceived = Serial.read();

    if (ByteReceived == 13) {

      picSend = true;

    }

    if (ByteReceived == 69) {

      errorFlag = true;

      //if(!picSend && counter == 1) noSDcard();

      //if(picSend && counter == 1) noPic();

      //if(picSend  && counter != 1) noPic();

//      resetFunc();

  epd_clear();

      counter = 0;

      Serial.flush();

      digitalWrite(7, LOW); // Hard Reset

      break;

    }

    if (ByteReceived == 75 && picSend && picLoaded) {
      
      break;

    }

    if (ByteReceived == 75 && picSend) {

      picLoaded = true;

    }

  }

  //if(!picLoaded  && counter != 1) noPic();

  digitalWrite(13, LOW);

  digitalWrite(lcd_on, LOW);

  picLoaded = false;

  errorFlag = false;

  picSend = false;

  refreshCounter = 0;

  enterSleep();

}

void enterSleep() {

  LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);

  wakeUp();

}