Way to Check Hardware Serial in Use?

[brtaylor]

Is there a way to see if one of the Hardware Serial ports is already being used (i.e. for Serial1, that Serial1.begin() has already been called)? I have two serial based device libraries and I'd like to make sure that the serial port isn't already in use by one library before initializing the second library so that I can either free the resource (i.e. Serial1.end()) or switch the serial port that is being used.

Thanks!

 

[PaulStoffregen]

Not from the Serial1 object, but you could look at the hardware registers.

    if ((SIM_SCGC4 & SIM_SCGC4_UART0)) {
        Serial.println("Serial1 hardware is turned on");
    }

 

[brtaylor]

Not from the Serial1 object, but you could look at the hardware registers.

    if ((SIM_SCGC4 & SIM_SCGC4_UART0)) {
        Serial.println("Serial1 hardware is turned on");
    }

Thanks! That'll work well enough.