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