47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
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#ifndef COLPORT_MCP23018_H
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#define COLPORT_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 <ColPort.h>
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#include "IOExpanderPort.h"
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/* One MCP23018 I/O expander port connected to matrix columns.
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Instantiation
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------------
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colPins parameter is port's bitwise pin configuration
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1=configure as input (for read)
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0=configure as output (for LED or not connected to a column)
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example instantiation for column port A, with pins 2 and 3 connected to columnss:
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IOExpanderPort portA(0, ~0);
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ColPort_MCP23018 colPortA(portA, 1<<2 | 1<<3 );
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example instantiation for column port B, with pins 2 and 3 connected to columns:
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IOExpanderPort portB(1, ~0);
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ColPort_MCP23018 colPortB(portB, 1<<2 | 1<<3 );
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colPins are read from pin 0 on up.
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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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*/
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class ColPort_MCP23018 : public ColPort
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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
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const uint8_t GPIO; //General Purpose Input/Ouput register
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const uint8_t GPPU; //General Purpose Pullup register
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public:
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//The constructor initialization list is in .cpp
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ColPort_MCP23018(IOExpanderPort& port, const uint8_t colPins);
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void begin();
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//read port and store result in portState
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virtual void read();
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};
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#endif
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