Blinky ESP8266

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);

  Serial.begin(115200);
  Serial.println("Start blinky");
}

void loop() {
  ledON();
  delay(1000);

  ledOFF();
  delay(1000);
}

void ledON() {
  Serial.println("LED ON");
  digitalWrite(LED_BUILTIN, LOW);
}

void ledOFF() {
  Serial.println("LED OFF");
  digitalWrite(LED_BUILTIN, HIGH);
}

BOARD?=esp8266:esp8266:d1_mini
PORT?=/dev/cu.usbserial-14*
BUILD=build

.PHONY: default lint all flash clean

default: lint all flash clean

lint:
	cpplint --extensions=ino --filter=-legal/copyright *.ino

all:
	arduino-cli compile --fqbn $(BOARD) --output-dir $(BUILD) ./

flash:
	arduino-cli upload --fqbn $(BOARD) --port $(PORT) --input-dir $(BUILD)

clean:
	rm -r build