43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
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#ifndef PORTREAD_MCP23S17_H
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#define PORTREAD_MCP23S17_H
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#include <Arduino.h>
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#include <inttypes.h>
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#include <SPI.h>
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#include <PortRead.h>
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#include "PortIOE.h"
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/* One MCP23S17 I/O expander port connected to matrix columns.
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MCP23S17 does not have internal pull-up resistors (PCA9535E does).
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Instantiation
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------------
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readPins parameter is port's bitwise pin configuration
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1=configure as input (for pins connected to column)
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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 0, with pins 2 and 3 connected to columns:
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PortIOE port0(0, 0);
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PortRead_MCP23S17 colPort0(port0, 2<<0 | 1<<3 );
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Example instantiation for column port 1, with pins 2 and 3 connected to columns:
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PortIOE port1(1, 0);
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PortRead_MCP23S17 colPort1(port1, 2<<0 | 1<<3 );
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readPins are read from pin 0 on up.
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*/
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class PortRead_MCP23S17 : public PortRead
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{
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private:
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PortIOE& port;
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public:
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/*
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todo not all PortRead_ classes need a readPins
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move PortRead::readPins from PortRead to PortRead_PCA9655E
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remove PortRead(0) initialization from this constructor
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*/
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//The constructor initialization list is in .cpp
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PortRead_MCP23S17(PortIOE& port) : PortRead(0), port(port) {}
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virtual uint8_t read();
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};
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#endif
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