#include <LiquidCrystal_I2C.h>
#include <HardwareSerial.h>
/*
  Wokwi Custom UART Chip example

  The chip implements a simple ROT13 letter substitution cipher:
  https://en.wikipedia.org/wiki/ROT13

  See https://link.wokwi.com/custom-chips-alpha for more info about custom chips
*/

/*
void setup() {
  Serial.begin(9600);
  
  Serial.println("ABC123");
}

void loop(){

  if (Serial.available()) {
    Serial.print((char)Serial.read());
  }
 
  delay(100);

}
*/

#define TIMEOUT 5000
unsigned long update = millis();

void readStream(HardwareSerial port, String outString, byte read);
enum : int {WRITE, READ};
void setup() {
  Serial.begin(9600);
  //Serial.println("Connection ready for UART chip:");

  Serial2.begin(9600); // Serial1 is connected to the custom chip  
  //Serial2.print("A");
  delay(2000);
  readStream(Serial2, "A", WRITE);
  //while (Serial2.available()) Serial.print(Serial2.read());
  //readStream(Serial2, "", READ);
}

void readStream(HardwareSerial port, String outString="", byte read=0) {
  String inString = "";
  if (!read) {
    //if (outString.length() > 0) 
    port.print("a"); //port.flush();
    //Serial.print("WROTE: "), Serial.println(outString);
  } else {
    update = millis();
    while (port.available() == 0 || (millis()-update) < TIMEOUT) {
      if (port.available()) {
        while (port.available()) inString += port.read();
        Serial.print("READ : "), Serial.println(inString);
      }
    }
  }
}


void loop() {
  
  while (Serial2.available()) Serial.print((char)Serial2.read());
  //delay(100);
}