uint8_t bitval=0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  bitWrite(bitval,5,1);
  Serial.printf("bitval -->%d!\n",bitval);
  bitWrite(bitval,4,1);
  Serial.printf("bitval -->%d!\n",bitval);
  bitWrite(bitval,5,0);
  Serial.printf("bitval -->%d!\n",bitval);
  bitWrite(bitval,4,0);
  Serial.printf("bitval -->%d!\n",bitval);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}