Communication between Raspberry pi and Arduino via GPIO

Projects Programming
5

yes I need to toogle either piPin1 and piPin2 or toggle both of them
i change the code into

const int piPin1 = 4;
const int piPin2 = 5;
int PiState = 0;

void setup() {
 pinMode(piPin1, INPUT);
 pinMode(piPin2, INPUT);
}

void loop() {
 PiState = digitalRead(PiState);
 
 if (PiState == HIGH) {
  digitalRead(piPin1);
  digitalRead(piPin2);
 }

 if (PiState == LOW){
  digitalRead(piPin1);
  digitalRead(piPin2);
 }
 return 0;
}

Im totally new into microcontroller , some advice or help would be appriciated