Cannot use add_event_detect

[DanielGM279]

Hello, I'm trying to use the add_event_detect with a callback function defined as follows:

void cb_fcn(const std::string& channel){
    cout << "Inside callback" << endl;
}

my_class::my_class(int new_pinPWMA, int new_Freq)
    :p(createPWM(new_pinPWMA, new_Freq))
{
    p.start(0);
    pulse = 0;
    add_event_detect(pinEncA,RISING, cb_fcn);
}

However I get the following error when I run the code:

terminate called after throwing an instance of 'std::runtime_error'
what(): [Exception] Channel 127 is invalid (catched from: GPIO::add_event_detect())

I followed the interrupt sample but can get my implementation to work, I hope you can help me.

Thank you for your time.

[pjueon]

Could you tell us these information?

• your jetson model
• the value of pinEncA in your code
• the numbering mode you're using

[DanielGM279]

Hello, I solved the problem already. Turns out the issue was with the order in which I was instantiating the object, which initiated before assigning a value to the pin number, resulting in a trash value.

Thanks for the support.