Support "inverted" GPIO PTT for rasPi

Andrew Rodland


On the Pi it would be very nice to be able to support an "inverted" GPIO line, which is normally high and goes low for transmit, as some circuits might want. I decided to implement it in the same way as direwolf, where a negative GPIO pin number specifies the inverted sense.

Here is a patch against the ardopc 1 sources that found their way to GitHub; hopefully it's easy to apply to current versions.


Andrew N2EON