Serial.println statements not printing in Setup()

Troubleshooting
1

Hi, can someone help me understand why my Serial.println statement in Setup() won’t output to the serial port (I’m using TeraTerm v.4.98). Inside the Void loop I can get printf statements to work. I’m using an Electron 0.7.0 OS. Thanks

SYSTEM_MODE(MANUAL);

void setup() {
    Serial.begin(9600);
    delay(1000);
    Serial.println("I'm printing just fine");

}

void loop() {

}
2

are you sure that teraterm is connected to the device in the 1 second delay? Try waiting for the serial port to connect or you press a key to continue like.

while(!Serial.available()){};
1 Like
3

Thanks for the suggestion. I made the chnage, but I’m still not seeing the Serial.println statement in TeraTerm. Here’s the updated code.

SYSTEM_MODE(MANUAL);

void setup() {
    Serial.begin(9600);
    while(!Serial.available()){}; 
    Serial.println("I'm printing just fine");

}

void loop() {

}
4

Update: the while statement did help and the Serial.println instructions are showing up in TeraTerm.

However, this solution really doesn’t address the underlying issue: why can’t TeraTerm capture the serial output in Setup()?

Are there any other methods (or terminal programs) or settings that I can use to address this?

5

It may be because you have just set up the serial port; I don’t think the computer could open a virtual COM port until it has been setup.

Also, try using waitUntil(Serial.isConnected());

If that doesn’t work, I would add like a delay(5000) before you try to print) to see if that makes a difference.

1 Like