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96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
#pragma once
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//
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// FILE: PCF8574.h
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// AUTHOR: Rob Tillaart
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// DATE: 02-febr-2013
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// VERSION: 0.3.6
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// PURPOSE: Arduino library for PCF8574 - 8 channel I2C IO expander
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// URL: https://github.com/RobTillaart/PCF8574
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// http://forum.arduino.cc/index.php?topic=184800
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//
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#include "Arduino.h"
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#include "Wire.h"
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#define PCF8574_LIB_VERSION (F("0.3.6"))
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#ifndef PCF8574_INITIAL_VALUE
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#define PCF8574_INITIAL_VALUE 0xFF
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#endif
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#define PCF8574_OK 0x00
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#define PCF8574_PIN_ERROR 0x81
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#define PCF8574_I2C_ERROR 0x82
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class PCF8574
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{
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public:
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explicit PCF8574(const uint8_t deviceAddress = 0x20, TwoWire *wire = &Wire);
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#if defined (ESP8266) || defined(ESP32)
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bool begin(int sda, int scl, uint8_t value = PCF8574_INITIAL_VALUE);
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#endif
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bool begin(uint8_t value = PCF8574_INITIAL_VALUE);
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bool isConnected();
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// note: setting the address corrupt internal buffer values
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// a read8() / write8() call updates them.
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bool setAddress(const uint8_t deviceAddress);
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uint8_t getAddress();
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uint8_t read8();
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uint8_t read(const uint8_t pin);
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uint8_t value() const { return _dataIn; };
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void write8(const uint8_t value);
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void write(const uint8_t pin, const uint8_t value);
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uint8_t valueOut() const { return _dataOut; }
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// added 0.1.07/08 Septillion
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uint8_t readButton8() { return PCF8574::readButton8(_buttonMask); }
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uint8_t readButton8(const uint8_t mask);
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uint8_t readButton(const uint8_t pin);
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void setButtonMask(const uint8_t mask) { _buttonMask = mask; };
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uint8_t getButtonMask() { return _buttonMask; };
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// rotate, shift, toggle, reverse expect all lines are output
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void toggle(const uint8_t pin);
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void toggleMask(const uint8_t mask = 0xFF); // default 0xFF ==> invertAll()
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void shiftRight(const uint8_t n = 1);
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void shiftLeft(const uint8_t n = 1);
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void rotateRight(const uint8_t n = 1);
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void rotateLeft(const uint8_t n = 1);
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void reverse();
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void select(const uint8_t pin);
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void selectN(const uint8_t pin);
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void selectNone() { write8(0x00); };
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void selectAll() { write8(0xFF); };
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int lastError();
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private:
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uint8_t _address;
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uint8_t _dataIn;
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uint8_t _dataOut;
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uint8_t _buttonMask;
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int _error;
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TwoWire* _wire;
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};
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// -- END OF FILE --
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