mirror of
https://github.com/RobTillaart/Arduino.git
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497 lines
9.3 KiB
C++
497 lines
9.3 KiB
C++
//
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// FILE: MCP23017.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.5
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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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// HISTORY:
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// 0.1.0 2019-10-12 initial version
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// 0.1.1 2020-06-19 refactor; #pragma once
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// 0.1.2 2021-01-01 add Arduino-CI + unit test
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// 0.2.0 2021-01-11 Multiple Wire support Wire0 .. 5
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// error handling
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// 0.2.1 2021-02-17 fix #7 DDR is defined in ESP32
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// 0.2.2 2021-04-23 fix for plpatformIO compatibility
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// 0.2.3 2021-06-06 add lastError() unit test + minor refactor.
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// 0.2.4 2021-09-16 add polarity and pull-up support
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// 0.2.5 2021-12-21 update library.json, license, minor edits
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#include "MCP23017.h"
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#define MCP23017_DDR_A 0x00 // Data Direction Register
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#define MCP23017_DDR_B 0x01
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#define MCP23017_POL_A 0x02 // Input Polarity (0 == normal 1== reversed)
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#define MCP23017_POL_B 0x03
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#define MCP23017_PUR_A 0x0C // Pull Up Resistors
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#define MCP23017_PUR_B 0x0D
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#define MCP23017_IOCR 0x0A // IO control register
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#define MCP23017_GPIOA 0x12
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#define MCP23017_GPIOB 0x13
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MCP23017::MCP23017(uint8_t addr, TwoWire *wire)
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{
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_addr = addr;
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_wire = wire;
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_error = MCP23017_OK;
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}
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#if defined(ESP8266) || defined(ESP32)
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bool MCP23017::begin(const uint8_t dataPin, const uint8_t clockPin)
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{
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_wire = &Wire;
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_wire->begin(dataPin, clockPin);
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// check connected
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if (! isConnected()) return false;
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// disable address increment (datasheet)
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if (! writeReg(MCP23017_IOCR, 0b00100000)) return false;
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// Force INPUT_PULLUP
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if (! writeReg(MCP23017_PUR_A, 0xFF)) return false;
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if (! writeReg(MCP23017_PUR_B, 0xFF)) return false;
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return true;
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}
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#endif
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bool MCP23017::begin()
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{
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_wire->begin();
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// check connected
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if (! isConnected()) return false;
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// disable address increment (datasheet)
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if (! writeReg(MCP23017_IOCR, 0b00100000)) return false;
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// Force INPUT_PULLUP
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if (! writeReg(MCP23017_PUR_A, 0xFF)) return false;
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if (! writeReg(MCP23017_PUR_B, 0xFF)) return false;
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return true;
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}
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bool MCP23017::isConnected()
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{
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_wire->beginTransmission(_addr);
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if (_wire->endTransmission() != 0)
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{
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_error = MCP23017_I2C_ERROR;
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return false;
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}
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_error = MCP23017_OK;
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return true;
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}
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// single pin interface
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// pin = 0..15
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// mode = INPUT, OUTPUT, INPUT_PULLUP (= same as INPUT)
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bool MCP23017::pinMode(uint8_t pin, uint8_t mode)
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{
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if (pin > 15)
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{
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_error = MCP23017_PIN_ERROR;
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return false;
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}
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if ((mode != INPUT) && (mode != INPUT_PULLUP) && (mode != OUTPUT))
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{
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_error = MCP23017_VALUE_ERROR;
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return false;
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}
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uint8_t dataDirectionRegister = MCP23017_DDR_A;
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if (pin > 7)
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{
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dataDirectionRegister = MCP23017_DDR_B;
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pin -= 8;
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}
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uint8_t val = readReg(dataDirectionRegister);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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uint8_t mask = 1 << pin;
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// only work with valid
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if ((mode == INPUT) || (mode == INPUT_PULLUP))
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{
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val |= mask;
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}
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else if (mode == OUTPUT)
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{
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val &= ~mask;
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}
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// other values won't change val ....
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writeReg(dataDirectionRegister, val);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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return true;
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}
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// pin = 0..15
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// value = LOW, HIGH
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bool MCP23017::digitalWrite(uint8_t pin, uint8_t value)
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{
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if (pin > 15)
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{
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_error = MCP23017_PIN_ERROR;
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return false;
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}
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uint8_t IOR = MCP23017_GPIOA;
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if (pin > 7)
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{
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IOR = MCP23017_GPIOB;
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pin -= 8;
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}
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uint8_t val = readReg(IOR);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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uint8_t mask = 1 << pin;
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if (value)
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{
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val |= mask;
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}
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else
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{
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val &= ~mask;
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}
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writeReg(IOR, val);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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return true;
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}
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uint8_t MCP23017::digitalRead(uint8_t pin)
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{
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if (pin > 15)
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{
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_error = MCP23017_PIN_ERROR;
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return MCP23017_INVALID_READ;
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}
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uint8_t IOR = MCP23017_GPIOA;
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if (pin > 7)
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{
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IOR = MCP23017_GPIOB;
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pin -= 8;
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}
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uint8_t val = readReg(IOR);
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if (_error != MCP23017_OK)
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{
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return MCP23017_INVALID_READ;
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}
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uint8_t mask = 1 << pin;
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if (val & mask) return HIGH;
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return LOW;
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}
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// pin = 0..15
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// reverse = true or false
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bool MCP23017::setPolarity(uint8_t pin, bool reversed)
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{
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if (pin > 15)
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{
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_error = MCP23017_PIN_ERROR;
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return false;
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}
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uint8_t inputPolarityRegister = MCP23017_POL_A;
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if (pin > 7)
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{
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inputPolarityRegister = MCP23017_POL_B;
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pin -= 8;
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}
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uint8_t val = readReg(inputPolarityRegister);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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uint8_t mask = 1 << pin;
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if (reversed)
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{
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val |= mask;
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}
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else
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{
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val &= ~mask;
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}
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writeReg(inputPolarityRegister, val);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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return true;
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}
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bool MCP23017::getPolarity(uint8_t pin, bool &reversed)
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{
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if (pin > 15)
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{
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_error = MCP23017_PIN_ERROR;
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return false;
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}
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uint8_t inputPolarityRegister = MCP23017_POL_A;
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if (pin > 7)
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{
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inputPolarityRegister = MCP23017_POL_B;
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pin -= 8;
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}
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uint8_t val = readReg(inputPolarityRegister);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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uint8_t mask = 1 << pin;
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reversed = (val & mask) > 0;
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return true;
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}
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// pin = 0..15
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// reverse = true or false
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bool MCP23017::setPullup(uint8_t pin, bool pullup)
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{
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if (pin > 15)
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{
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_error = MCP23017_PIN_ERROR;
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return false;
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}
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uint8_t inputPullupRegister = MCP23017_PUR_A;
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if (pin > 7)
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{
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inputPullupRegister = MCP23017_PUR_B;
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pin -= 8;
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}
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uint8_t val = readReg(inputPullupRegister);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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uint8_t mask = 1 << pin;
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if (pullup)
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{
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val |= mask;
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}
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else
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{
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val &= ~mask;
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}
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writeReg(inputPullupRegister, val);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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return true;
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}
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bool MCP23017::getPullup(uint8_t pin, bool &pullup)
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{
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if (pin > 15)
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{
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_error = MCP23017_PIN_ERROR;
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return false;
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}
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uint8_t inputPullupRegister = MCP23017_PUR_A;
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if (pin > 7)
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{
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inputPullupRegister = MCP23017_PUR_B;
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pin -= 8;
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}
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uint8_t val = readReg(inputPullupRegister);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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uint8_t mask = 1 << pin;
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pullup = (val & mask) > 0;
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return true;
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}
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///////////////////////////////////////////////////////////////////////
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// 8 pins interface
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// whole register at once
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// port = 0..1
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// value = 0..0xFF bit pattern
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bool MCP23017::pinMode8(uint8_t port, uint8_t value)
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{
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if (port > 1)
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{
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_error = MCP23017_PORT_ERROR;
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return false;
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}
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if (port == 0) writeReg(MCP23017_DDR_A, value);
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if (port == 1) writeReg(MCP23017_DDR_B, value);
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_error = MCP23017_OK;
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return true;
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}
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bool MCP23017::write8(uint8_t port, uint8_t value) // port = 0..1
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{
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if (port > 1)
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{
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_error = MCP23017_PORT_ERROR;
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return false;
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}
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if (port == 0) writeReg(MCP23017_GPIOA, value);
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if (port == 1) writeReg(MCP23017_GPIOB, value);
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_error = MCP23017_OK;
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return true;
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}
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int MCP23017::read8(uint8_t port)
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{
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if (port > 1)
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{
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_error = MCP23017_PORT_ERROR;
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return MCP23017_INVALID_READ;
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}
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_error = MCP23017_OK;
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if (port == 0) return readReg(MCP23017_GPIOA);
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return readReg(MCP23017_GPIOB); // port == 1
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}
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// port = 0..1
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// mask = 0..0xFF bit pattern
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bool MCP23017::setPolarity8(uint8_t port, uint8_t mask)
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{
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if (port > 1)
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{
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_error = MCP23017_PORT_ERROR;
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return false;
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}
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if (port == 0) writeReg(MCP23017_POL_A, mask);
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if (port == 1) writeReg(MCP23017_POL_B, mask);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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return true;
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}
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bool MCP23017::getPolarity8(uint8_t port, uint8_t &mask)
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{
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if (port > 1)
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{
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_error = MCP23017_PORT_ERROR;
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return false;
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}
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if (port == 0) mask = readReg(MCP23017_POL_A);
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if (port == 1) mask = readReg(MCP23017_POL_B);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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return true;
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}
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// port = 0..1
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// mask = 0..0xFF bit pattern
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bool MCP23017::setPullup8(uint8_t port, uint8_t mask)
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{
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if (port > 1)
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{
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_error = MCP23017_PORT_ERROR;
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return false;
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}
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if (port == 0) writeReg(MCP23017_PUR_A, mask);
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if (port == 1) writeReg(MCP23017_PUR_B, mask);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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return true;
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}
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bool MCP23017::getPullup8(uint8_t port, uint8_t &mask)
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{
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if (port > 1)
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{
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_error = MCP23017_PORT_ERROR;
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return false;
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}
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if (port == 0) mask = readReg(MCP23017_PUR_A);
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if (port == 1) mask = readReg(MCP23017_PUR_B);
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if (_error != MCP23017_OK)
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{
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return false;
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}
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return true;
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}
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int MCP23017::lastError()
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{
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int e = _error;
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_error = MCP23017_OK; // reset error after read.
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return e;
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}
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////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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bool MCP23017::writeReg(uint8_t reg, uint8_t value)
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{
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_wire->beginTransmission(_addr);
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_wire->write(reg);
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_wire->write(value);
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if (_wire->endTransmission() != 0)
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{
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_error = MCP23017_I2C_ERROR;
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return false;
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}
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_error = MCP23017_OK;
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return true;
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}
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uint8_t MCP23017::readReg(uint8_t reg)
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{
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_wire->beginTransmission(_addr);
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_wire->write(reg);
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if (_wire->endTransmission() != 0)
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{
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_error = MCP23017_I2C_ERROR;
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return 0;
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}
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else
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{
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_error = MCP23017_OK;
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}
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uint8_t n = _wire->requestFrom(_addr, (uint8_t)1);
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if (n != 1)
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{
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_error = MCP23017_I2C_ERROR;
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return 0;
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}
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return _wire->read();
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}
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// -- END OF FILE --
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