Arduino nano, but faster

Using Arduino Microcontrollers
7

Got around to doing some testing.

My test code:

#define PIN 2

uint8_t myPort;
uint8_t myPinBit;

void setup() {
  pinMode(PIN, OUTPUT);
  Serial.begin(115200);
  myPort = portOutputRegister(digitalPinToPort(PIN));
  myPinBit = digitalPinToBitMask(PIN);
}

void loop() {
  unsigned long startTime = micros();
  for (long i = 0; i < 100000UL; i++) {
    digitalWrite(PIN, HIGH);
    digitalWrite(PIN, LOW);
  }
  float digWriteSpeed = (micros() - startTime)/200000.00;
  Serial.print("digitalWrite() ");
  Serial.print(digWriteSpeed);
  
  startTime = micros();
  for (long i = 0; i < 100000UL; i++) {
    myPort |= myPinBit;
    myPort &= ~myPinBit;
  }
  float portManipSpeed = (micros() - startTime)/200000.00;
  Serial.print("us, Port Manipulation ");
  Serial.print(portManipSpeed);
  Serial.print("us which is ");
  Serial.print(digWriteSpeed/portManipSpeed);
  Serial.println(" times faster");
  
}

Arduino Nano 3 (atmega328 @ 16MHz):
digitalWrite() 3.59us, Port Manipulation 0.28us which is 12.65 times faster

Arduino Pro Micro (atmega32u4 @ 16MHz):
digitalWrite() 3.67us, Port Manipulation 0.28us which is 12.89 times faster