Example Code for Arduino-Serial Port

Hardware Preparation

• FireBeetle 2 ESP32-E (SKU: DFR0654-F) x1
• USB cable x1

Other Preparation Work

We have learned how to light up the LED through the IO port before. In this lesson, we'll learn about the principle of serial communication. FireBeetle 2 ESP32-E development board has two hardware serial ports, and both of them are remappable. UART0, also Serial in Arduino, is used for USB.

Sample Code

Program function: the UART serial prints timing data once per second.

void setup() {
  Serial.begin(115200);    //Initialize the serial port and set the baud rate to 115200
}

void loop() {
 static unsigned long i = 0;  //Static variables(local variables), initialized only once
 Serial.println(i++);   //serial prints i++
 delay(1000);
}

Result

Open the serial monitor, set the baud rate to 115200, and you can see the printed value increasing every second.