"John D. Hays" <john@...>
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Documentation is tied to product release.
If one knows how to open audio devices under Linux and manipulate GPIO pins on a Raspberry Pi, then one has the basic knowledge to program the UDRC.
I use WiringPi for GPIO manipulation. Source of the dstarrepeatercontroller will be generally available for examples.
On the HD-15 connector (used to connect to the DR-1X) there are unbuffered GPIO pins for:
Ground and Power (The UDRC and Raspberry Pi are powered from the repeater)
The mini-din 6 will follow amateur radio convention, however the control pins will be buffered because of potential voltage differences.
More advanced topics will follow basic documentation.