mirror of
https://github.com/RobTillaart/Arduino.git
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145 lines
4.0 KiB
C++
145 lines
4.0 KiB
C++
#pragma once
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//
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// FILE: MCP23017.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.7.1
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// PURPOSE: Arduino library for I2C MCP23017 16 channel port expander
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// DATE: 2019-10-12
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// URL: https://github.com/RobTillaart/MCP23017_RT
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//
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// WARNING: please read REV D note in readme.md.
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#include "Arduino.h"
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#include "Wire.h"
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#include "MCP23x17_registers.h"
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#define MCP23017_LIB_VERSION (F("0.7.1"))
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#define MCP23017_OK 0x00
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#define MCP23017_PIN_ERROR 0x81
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#define MCP23017_I2C_ERROR 0x82
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#define MCP23017_VALUE_ERROR 0x83
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#define MCP23017_PORT_ERROR 0x84
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#define MCP23017_REGISTER_ERROR 0xFF
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#define MCP23017_INVALID_READ 0xFF
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class MCP23017
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{
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public:
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MCP23017(uint8_t address, TwoWire *wire = &Wire);
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bool begin(bool pullup = true);
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bool isConnected();
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uint8_t getAddress();
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// single pin interface
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// mode = INPUT, OUTPUT, INPUT_PULLUP (= same as INPUT)
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// do not use 0, 1 for mode.
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bool pinMode1(uint8_t pin, uint8_t mode);
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bool write1(uint8_t pin, uint8_t value);
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uint8_t read1(uint8_t pin);
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bool setPolarity(uint8_t pin, bool reversed);
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bool getPolarity(uint8_t pin, bool &reversed);
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bool setPullup(uint8_t pin, bool pullup);
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bool getPullup(uint8_t pin, bool &pullup);
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// 8 pins interface
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// port = 0..1
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// mask = 0x00..0xFF bit pattern,
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// bit 0 = output mode, bit 1 = input mode
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// value = bit pattern.
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bool pinMode8(uint8_t port, uint8_t mask);
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bool write8(uint8_t port, uint8_t value);
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int read8(uint8_t port);
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bool setPolarity8(uint8_t port, uint8_t mask);
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bool getPolarity8(uint8_t port, uint8_t &mask);
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bool setPullup8(uint8_t port, uint8_t mask);
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bool getPullup8(uint8_t port, uint8_t &mask);
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// 16 pins interface
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// mask = 0x0000..0xFFFF bit pattern
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// bit 0 = output mode, bit 1 = input mode
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// value = bit pattern.
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bool pinMode16(uint16_t mask);
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bool write16(uint16_t value);
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uint16_t read16();
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bool setPolarity16(uint16_t mask);
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bool getPolarity16(uint16_t &mask);
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bool setPullup16(uint16_t mask);
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bool getPullup16(uint16_t &mask);
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// INTERRUPTS (experimental)
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// pin = 0..15, mode = { RISING, FALLING, CHANGE }
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bool enableInterrupt(uint8_t pin, uint8_t mode);
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bool disableInterrupt(uint8_t pin);
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// mask = 0x0000..0xFFFF (overrides all earlier settings.
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bool enableInterrupt16(uint16_t mask, uint8_t mode);
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bool disableInterrupt16(uint16_t mask);
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// which pins caused the INT?
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uint16_t getInterruptFlagRegister();
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uint16_t getInterruptCaptureRegister();
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// polarity: 0 = LOW, 1 = HIGH, 2 = NONE/ODR
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bool setInterruptPolarity(uint8_t polarity);
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uint8_t getInterruptPolarity();
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// merge INTA and INTB
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bool mirrorInterrupts(bool on);
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bool isMirroredInterrupts();
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// debugging
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int lastError();
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// set/clear IOCR bit fields
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bool enableControlRegister(uint8_t mask);
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bool disableControlRegister(uint8_t mask);
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protected:
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// access to low level registers (just make these functions public).
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// USE WITH CARE !!!
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bool writeReg(uint8_t reg, uint8_t value);
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uint8_t readReg(uint8_t reg);
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bool writeReg16(uint8_t reg, uint16_t value);
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uint16_t readReg16(uint8_t reg);
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uint8_t _address;
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TwoWire* _wire;
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uint8_t _error;
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};
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/*
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TODO
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- can it protect the user
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- can we detect REV D chips (over I2C)
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class MCP23017_REVD : public MCP23017
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{
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public:
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MCP23017_REVD(uint8_t address, TwoWire *wire = &Wire);
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- GPA7 and GPB7 should be set to output in constructor
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- GPA7 and GPB7 output mode may not change in any call
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- GPA7 and GPB7 should return last written value for read.
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- which functions are affected? setMode pullups etc.
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};
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*/
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// -- END OF FILE --
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