I made my own arduino uno board. According to the schematic, pins ADC6 and ADC7 are not connected. On my board, I connected it. What do I have to do to get the arduino to use those pins? Do I have to modify the config file? Do I have to make a basically use non arduino libraries during that part of the code that uses the pins?
I made my own arduino uno board. According to the schematic, pins ADC6 and ADC7 are not connected
What processor with what package?
With the 328 DIL package these pins do not come out of the package so there is no way to use them.
AD6 & AD7 are analog input only and available on TQFP parts.
If you want to use them, simplest way might be to burn a bootloader for a board type that has those pins broken out already.
Or, modify the pins_arduino.h that you use for your board to add the extra pins.
I don't quite follow how all this works, but I saw that one of the clones I use which has the extra ADCs connected just had build.variant=eightanaloginputs added to its entry in boards.txt. There is already a copy of pins_arduino.h under arduino/variants/eightanaloginputs/ which has the extra analog inputs defined.
I guess you would be making an entry in boards.txt for your new board, and perhaps if you base it on the right variant you won't need to create your own copies of pins_arduino.h.