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- #ifndef PORT_MCP23S17_H
- #define PORT_MCP23S17_H
- #include <Arduino.h>
- #include <inttypes.h>
- #include <SPI.h>
- #include "PortInterface.h"
-
- /* Port_MCP23S17
- write pins are connected to matrix Row (strobe pin) or LED.
- readPins are connected to matrix column to read which keys are pressed.
-
- slaveSelect is Arduino-pin number connected to pin 11 (CS a.k.a. SS).
-
- Instantiation
- ------------
- MCP23S17 datasheet identifies ports by letters, while class Port_MCP23S17 uses portNum
- for port A, use portNum=0
- for port B, use portNum=1
- readPins parameter configures port's pins.
-
- Example instantiation:
- const uint8_t IOE_ADDR = 0x20; //MCP23S17 address, all 3 ADDR pins are grounded
- Port_MCP23S17 portB(IOE_ADDR, 1, 0); //all pins are set to output for strobes and LEDs
- Port_MCP23S17 portA(IOE_ADDR, 0, 1<<0 | 1<<1 ); //pin 0 and pin 1 are set to input for reading,
- //remaining pins can be used for LEDs
-
- Diode orientation
- ----------------
- Diode orientation is explained in keybrd_library_user_guide.md > Diode orientation
-
- MCP23S17 data sheet
- ------------------
- http://www.onsemi.com/pub_link/Collateral/MCP23S17-D.PDF
- */
- class Port_MCP23S17 : public PortInterface
- {
- private:
- const uint8_t slaveSelect; //controller-pin number
- const uint8_t deviceAddr;
- const uint8_t portNum; //port identification number
- uint8_t outputVal; //bit pattern for strobe and LEDs
- const uint8_t readPins; //bit pattern, IODIR 0=output, 1=input
- uint8_t transfer(const uint8_t command, const uint8_t registerAddr, const uint8_t data);
- public:
- Port_MCP23S17(const uint8_t slaveSelect, const uint8_t deviceAddr, const uint8_t portNum, const uint8_t readPins)
- : slaveSelect(slaveSelect), deviceAddr(deviceAddr), portNum(portNum), outputVal(0), readPins(readPins) {}
- void beginProtocol();
- void begin(const uint8_t activeState);
- virtual void writeLow(const uint8_t pin);
- virtual void writeHigh(const uint8_t pin);
- virtual uint8_t read();
- };
- #endif
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