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76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
/* Arduino DigitalIO Library
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* Copyright (C) 2013 by William Greiman
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*
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* This file is part of the Arduino DigitalIO Library
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*
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* This Library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Arduino DigitalIO Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file
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* @brief Digital AVR port I/O with runtime pin number.
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*
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* @defgroup runtimeDigital Runtime Pin I/O
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* @details Two Wire Interface library.
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* @{
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*/
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#if defined(__AVR__) || defined(DOXYGEN) // AVR only
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#include "PinIO.h"
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#include <util/atomic.h>
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#include <Arduino.h>
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//==============================================================================
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/** Constructor
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* @param[in] pin Pin assigned to this object.
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*/
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PinIO::PinIO(uint8_t pin)
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{
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begin(pin);
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}
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//------------------------------------------------------------------------------
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/** Initialize pin bit mask and port address.
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* @param[in] pin Arduino board pin number.
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* @return true for success or false if invalid pin number.
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*/
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bool PinIO::begin(uint8_t pin)
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{
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if (pin >= NUM_DIGITAL_PINS) {
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return false;
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}
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uint8_t port = digitalPinToPort(pin);
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pinReg_ = portInputRegister(port);
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bit_ = digitalPinToBitMask(pin);
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mask_ = ~bit_;
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portReg_ = pinReg_ + 2;
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return true;
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}
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//------------------------------------------------------------------------------
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/** Configure the pin.
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*
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* @param[in] mode: INPUT or OUTPUT.
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* @param[in] level If mode is OUTPUT, set level high/low.
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* If mode is INPUT, enable or disable the pin's 20K pullup.
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*
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* This function may be used with interrupts enabled or disabled.
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* The previous interrupt state will be restored.
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*/
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void PinIO::config(uint8_t mode, bool level)
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{
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
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modeI(mode);
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writeI(level);
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}
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}
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#endif // __AVR__
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/** @} */
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