47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
#ifndef ROWPORT_MCP23018_H
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#define ROWPORT_MCP23018_H
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#include <Arduino.h>
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#include <inttypes.h>
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#include <Wire.h>
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#include <RowPort.h>
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#include "IOExpanderPort.h"
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/* One MCP23018 I/O expander port connected to matrix rows.
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begin() configures column port's IODIR, GPIO.
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This should normally be called only once.
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Instantiation
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------------
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Example instantiation for row port A:
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IOExpanderPort portA(0, ~0);
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RowPort_MCP23018 rowPortA(portA);
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Example instantiation for row port B:
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IOExpanderPort portB(1, ~0);
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RowPort_MCP23018 rowPortB(portB);
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Diode orientation
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----------------
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Rows, columns, and diode orientation are explained in Matrix.h
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MCP23018 data sheet
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------------------
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http://ww1.microchip.com/downloads/en/DeviceDoc/22103a.pdf
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*/
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class RowPort_MCP23018 : public RowPort
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{
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private:
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IOExpanderPort& port;
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const uint8_t IODIR; //Input/Ouput Direction register address
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const uint8_t GPIO; //General Purpose Input/Ouput register address
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public:
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//The constructor initialization list is in .cpp
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RowPort_MCP23018(IOExpanderPort& port);
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void begin();
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virtual void setActivePinLow(const uint8_t activePin); //activePin is a port mask
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virtual void setActivePinHigh(const uint8_t activePin);
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};
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#endif
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