Blinky with Arduino on ESP32-C3

// Switch LED between an external LED or the on-board LED
// #define LED LED_BUILTIN
#define LED 3

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

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

void loop() {
  ledON();
  delay(200);

  ledOFF();
  delay(200);
}

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

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

BOARD?=esp32:esp32:esp32c3
PORT?=/dev/cu.SLAB_USBtoUART*
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