98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
/***************************************************
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This is a library for the MCP23017 i2c port expander
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These displays use I2C to communicate, 2 pins are required to
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interface
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Adafruit invests time and resources providing this open source code,
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please support Adafruit and open-source hardware by purchasing
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products from Adafruit!
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Written by Limor Fried/Ladyada for Adafruit Industries.
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BSD license, all text above must be included in any redistribution
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****************************************************/
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#ifndef _Adafruit_MCP23017_H_
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#define _Adafruit_MCP23017_H_
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// Don't forget the Wire library
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#ifndef ARDUINO_AVR_GEMMA
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//TinyWireM is now part of
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// Adafruit version of Wire Library, so this
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// will work with Adafruit ATtiny85's
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//But Arduino Gemma doesn't use that library
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// We do NOT want to include Wire if it's an arduino Gemma
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#include <Wire.h>
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#else
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#include <TinyWireM.h>
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#define Wire TinyWireM
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#endif
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class Adafruit_MCP23017 {
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public:
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void begin(uint8_t addr);
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void begin(void);
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void pinMode(uint8_t p, uint8_t d);
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void digitalWrite(uint8_t p, uint8_t d);
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void pullUp(uint8_t p, uint8_t d);
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uint8_t digitalRead(uint8_t p);
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void writeGPIOAB(uint16_t);
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uint16_t readGPIOAB();
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uint8_t readGPIO(uint8_t b);
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void setupInterrupts(uint8_t mirroring, uint8_t open, uint8_t polarity);
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void setupInterruptPin(uint8_t p, uint8_t mode);
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uint8_t getLastInterruptPin();
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uint8_t getLastInterruptPinValue();
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private:
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uint8_t i2caddr;
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uint8_t bitForPin(uint8_t pin);
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uint8_t regForPin(uint8_t pin, uint8_t portAaddr, uint8_t portBaddr);
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uint8_t readRegister(uint8_t addr);
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void writeRegister(uint8_t addr, uint8_t value);
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/**
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* Utility private method to update a register associated with a pin (whether port A/B)
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* reads its value, updates the particular bit, and writes its value.
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*/
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void updateRegisterBit(uint8_t p, uint8_t pValue, uint8_t portAaddr, uint8_t portBaddr);
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};
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#define MCP23017_ADDRESS 0x20
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// registers
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#define MCP23017_IODIRA 0x00
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#define MCP23017_IPOLA 0x02
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#define MCP23017_GPINTENA 0x04
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#define MCP23017_DEFVALA 0x06
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#define MCP23017_INTCONA 0x08
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#define MCP23017_IOCONA 0x0A
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#define MCP23017_GPPUA 0x0C
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#define MCP23017_INTFA 0x0E
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#define MCP23017_INTCAPA 0x10
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#define MCP23017_GPIOA 0x12
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#define MCP23017_OLATA 0x14
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#define MCP23017_IODIRB 0x01
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#define MCP23017_IPOLB 0x03
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#define MCP23017_GPINTENB 0x05
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#define MCP23017_DEFVALB 0x07
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#define MCP23017_INTCONB 0x09
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#define MCP23017_IOCONB 0x0B
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#define MCP23017_GPPUB 0x0D
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#define MCP23017_INTFB 0x0F
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#define MCP23017_INTCAPB 0x11
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#define MCP23017_GPIOB 0x13
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#define MCP23017_OLATB 0x15
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#define MCP23017_INT_ERR 255
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#endif
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