Harris RF550 VFO Encoder v1.0
Copyright (c) Giuseppe Perotti, I1EPJ, 2026
i1epj@aricasale.it

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

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This program uses the following libraries:
  Encoder by Paul Stoffregen
  LiquidCrystal_PCF8574.by Matthias Hertel

Author copyright notices and license terms follow.

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Encoder Library, for measuring quadrature encoded signals
http://www.pjrc.com/teensy/td_libs_Encoder.html
Copyright (c) 2011,2013 PJRC.COM, LLC - Paul Stoffregen <paul@pjrc.com>

Version 1.2 - fix -2 bug in C-only code
Version 1.1 - expand to support boards with up to 60 interrupts
Version 1.0 - initial release
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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LiquidCrystal_PCF8574.h
LiquidCrystal library with PCF8574 I2C adapter.

Matthias Hertel, http://www.mathertel.de

Copyright (c) 2019 by Matthias Hertel.\n

The library work is licensed under a BSD style license.\n
See http://www.mathertel.de/License.aspx

This library can drive a Liquid Crystal Display (LCD) based on the Hitachi
HD44780 chip that is connected through a PCF8574 I2C adapter.

The API for this library is common to many LCD libraries and documented in
https://www.arduino.cc/en/Reference/LiquidCrystal. and partially functions
from the LCD API at https://playground.arduino.cc/Code/LCDAPI/.

By Default it uses the original Wire library for communication.
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