Example Code for Arduino-USB Serial Ports
Last revision 2026/01/14
This article offers an example code for initializing and using multiple serial ports on the Arduino M0, including USB and hardware ports, with instructions for hardware and software setup across different platforms.
Hardware Preparation
- DFRduino M0 Mainboard(SKU: DFR0392) ×1
- Micro USB Cable ×1
Software Preparation
- Download Arduino IDE: Click to download Arduino IDE.
Other Preparation Work
Just like Arduino Leonardo, M0 has USB Serial Port and Hardware Serial Port.
| Serial Port Type | Serial Object |
|---|---|
| USB Serial Port | Serial |
| Hardware Serial Port 1 | Serial1 |
| Hardware Serial Port 2 | Serial2 |
Tested Platform:
- Windows: win7 32bit/64bit, win8 32bit/64bit, win10 32bit
- Linux: ubuntu 12.04 32bit
- Mac
Sample Code
Init 3 serial ports(115200bps), print specific text cyclically per second.
void setup() { // put your setup code here, to run once:
Serial.begin(115200);
while(!Serial);
Serial1.begin(115200);
Serial2.begin(115200);
}
void loop() { // put your main code here, to run repeatedly:
Serial.println("I am USB CDC Serial");
Serial1.println("I am Serial 1");
Serial2.println("I am Serial 2");
delay(1000);
}
Result
Three serial ports print respective texts cyclically every 1 second.
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