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