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Unused Pin/Port declaration

Hello everyone,

 

I developed a "custom Arduino2560 board", and it aims to be used with a Labview application using LINX.

I would like to have more details about how to first program it.

 

Some of the pin are unused(unbound), and I know that I will have to declare it somewhere to activate internal pull-up resistor by this way for example:

 

My questions are:

 

- Can someone tell me what is the difference between a firmware and a bootloader?

 

- Where those lines have to be implemented? In the pre-built firmware generated by LINX?

 

Thank you

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