Print to serial console from subroutine?

Development Tools Cloud IoT
1

Hi, I am unable to print to serial console from a subroutine.
Is it possible ?

here is an example:

This program starts the serial console and listens for commands.
commands are:
reboot (reboots ESP32)
testl (prints a line from loop() )
tests (prints a line for subroutine)

Simulator:

here is the test code:

void TestPrintln(){
  Serial.println("Test from subroutine success.");
  }

void setup() {
  // put your setup code here, to run once:
    Serial.begin(115200);
    Serial.println("Boot started.");
    Serial.println("----------------");
}

void loop() {
  //Check commands over serial  
  if (Serial.available())
  {
    String command = Serial.readStringUntil(10);

    if (command == "reboot"){ESP.restart();}
    else if (command == "testl") {Serial.println("Test from loop success.");}
    else if (command == "tests") {TestPrintln;}
    
  }
}
2

It is possible
Calling a function is done with parenthesis though… TestPrintln();

1 Like
3

I guess that the semicolon at the end of the testl line ends the command interpretation and attaches the following "else if..." to the outer if (Serial.available()).

4

Serial.readStringUntil() - Arduino Reference

Another way:

void loop()
{
  if (verbose) { Serial.print(F("Enter Instruction: ")); }
  Serial.readBytes( Inst, 4);
  Operation = Inst; Operation.trim();

Full code:
Don't Cross The Streams (FP scientific calculator serial co-processor) - Community / Exhibition / Gallery - Arduino Forum

6

Thanks, adding () did the trick ! :slight_smile:

7

Have fun

I would recommend to call strip() as in the simulator so that you don’t get hidden white space characters in your string

8

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