92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/*
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||
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|| @file Keypad_tw.h
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|| @version 1.0 - Convert Keypad_I2C to use TinyWireM library for ATtiny micros
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|| @version 2.0 - PCF8575 support added by Paul Williamson
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|| @author G. D. (Joe) Young, ptw
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|| @contact "G. D. (Joe) Young" <gdyoung@islandnet.com>
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||
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|| @description
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|| | Keypad_tw provides an interface for using matrix keypads that
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|| | are attached to I2C port expanders. It supports multiple keypads,
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|| | user selectable pins, and user defined keymaps.
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|| |
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|| | This version replaces all references to Wire functions (TwoWire) with
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|| | their TinyWireM (USI_TWI) equivalents
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|| #
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||
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|| @license
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|| | This library is free software; you can redistribute it and/or
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|| | modify it under the terms of the GNU Lesser General Public
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|| | License as published by the Free Software Foundation; version
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|| | 2.1 of the License.
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|| |
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|| | This library is distributed in the hope that it will be useful,
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|| | but WITHOUT ANY WARRANTY; without even the implied warranty of
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|| | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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|| | Lesser General Public License for more details.
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|| |
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|| | You should have received a copy of the GNU Lesser General Public
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|| | License along with this library; if not, write to the Free Software
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|| | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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|| #
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||
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*/
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#ifndef KEYPAD_tw_H
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#define KEYPAD_tw_H
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#include "Keypad.h"
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#include <Wire.h>
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#define PCF8574 1 // PCF8574 I/O expander device is 1 byte wide
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#define PCF8574A 1 // PCF8574A I/O expander device is 1 byte wide
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#define PCF8575 2 // PCF8575 I/O expander device is 2 bytes wide
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class Keypad_tw : public Keypad {
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public:
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Keypad_tw(char* userKeymap, byte* row, byte* col, byte numRows, byte numCols, byte address, byte width = 1) :
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Keypad(userKeymap, row, col, numRows, numCols) { twaddr = address; twwidth = width;}
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// Keypad function
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void begin(char *userKeymap);
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// Wire function
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void begin(void);
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// Wire function
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// void begin(byte address); //TinyWireM does not allow re-assigning bus adr
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// Wire function
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// void begin(int address);
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void pin_mode(byte pinNum, byte mode) {}
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void pin_write(byte pinNum, boolean level);
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int pin_read(byte pinNum);
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// read initial value for pinState
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word pinState_set( );
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// write a whole byte or word (depending on the port expander chip) to tw port
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void port_write( word twportval );
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private:
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// tw device address
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byte twaddr;
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// tw port expander device width in bytes (1 for 8574, 2 for 8575)
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byte twwidth;
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// tw pin_write state persistant storage
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// least significant byte is used for 8-bit port expanders
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word pinState;
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};
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#endif // KEYPAD_tw_H
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/*
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|| @changelog
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|| | 1.0 2015-05-24 - Joe Young : initial conversion from Wire to TinyWireM
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|| |
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|| | 2.0 2013-08-31 - Paul Williamson : Added twwidth parameter for PCF8575 support
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|| |
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|| | 1.0 2012-07-12 - Joe Young : Initial Release
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|| #
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*/
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