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This is a hacked version of pikeyd,
which polls a 24bit joystick interface
consisting of 3 74hc165 (option: serial Trackball/mouse/4 channel adc hardware converter)

New: Extension mechanism to access 
special keys (see pikeyd165.conf).

Trackball Emulation added. use -smi to disable
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pikeyd 1.0 (Jan 2013)
The Universal Raspberry Pi GPIO keyboard daemon.
Copyright (C) 2013 Michael Moller.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

This daemon uses less than 1% of the RPi CPU.
It polls and debounces the configured GPIO inputs,
and emits uinput events to simulate the keyboard.
Each GPIO contact can emit a sequence of keyboard characters.
Configuration is stored in either ~/.pikeyd165.conf or /etc/pikeyd165.conf

Usage: pikeyd [option]

Options:
  -d    run as daemon
  -k    try to terminate running daemon
  -v    version
  -smi  skip mouse initialisation, no mouse/trackball devices are created
  -ndb  no key debounce
  -h    this help