Callback function after Arduino was initialized

[nandlab]

Hello Dimitry,
I am trying to configure a set of pins as input pullups. I want a function to be called when a pin becomes low or is already low in the beginning.

So I have created a debounce object and registered on_state_changed callbacks for every pin. The problem is, if the pin is already low, the callback is not called.

How should I program it correctly?

[dimitry-ishenko]

Please post a snipped showing what you are trying to do and I will take a look.

[nandlab]

I have a set of input pins. After the program start I would like to know the exact state of all pins. It can be different, because the devices, which are connected to the pins, work stand-alone, and already have their own state, not depending on the program.

The probem is that the event on_state_change is only called when the state was changed, but the event is not called for the initial state after the program start.

So, how can I get the initial state of a pin after the program start? Is there a callback function, which is called, when the Firmata client is completely initialized to be able to get the current pin states?

I suppose, that after the first time the Arduino is queried in the constructor, and the library receives all the responses, a user callback could be called - see below.

What do you think?

client::client(io_base* io, bool dont_reset) : io_(io)
{
    using namespace std::placeholders;

    delegate_.report_digital = std::bind(&client::report_digital, this, _1, _2);
    delegate_.report_analog = std::bind(&client::report_analog, this, _1, _2);
    delegate_.digital_value = std::bind(&client::digital_value, this, _1, _2);
    delegate_.analog_value = std::bind(&client::analog_value, this, _1, _2);
    delegate_.pin_mode = std::bind(&client::pin_mode, this, _1, _2);

    if(!dont_reset) reset_();

    query_version();
    query_firmware();

    query_capability();
    query_analog_mapping();
    query_state();

    set_report();

    /*****************************************************************/
    /*********** User callback somehow after this point??? ***********/
    /*****************************************************************/

    id_ = io_->on_read(std::bind(&client::async_read, this, _1, _2));
}