Digital IO
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00001 /* Arduino DigitalIO Library 00002 * Copyright (C) 2013 by William Greiman 00003 * 00004 * This file is part of the Arduino DigitalIO Library 00005 * 00006 * This Library is free software: you can redistribute it and/or modify 00007 * it under the terms of the GNU General Public License as published by 00008 * the Free Software Foundation, either version 3 of the License, or 00009 * (at your option) any later version. 00010 * 00011 * This Library is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License 00017 * along with the Arduino DigitalIO Library. If not, see 00018 * <http://www.gnu.org/licenses/>. 00019 */ 00028 #ifndef PinIO_h 00029 #define PinIO_h 00030 #include <util/atomic.h> 00031 #include <avr/io.h> 00032 //------------------------------------------------------------------------------ 00037 class PinIO { 00038 public: 00040 PinIO() : bit_(0), mask_(0XFF) {} 00041 explicit PinIO(uint8_t pin); 00042 bool begin(uint8_t pin); 00043 void config(bool mode, bool data); 00044 //---------------------------------------------------------------------------- 00046 inline __attribute__((always_inline)) 00047 bool read() {return *pinReg_ & bit_;} 00048 //---------------------------------------------------------------------------- 00054 inline __attribute__((always_inline)) 00055 void toggle() {*pinReg_ = bit_;} 00056 //============================================================================ 00063 inline __attribute__((always_inline)) 00064 void highI() {writeI(1);} 00071 inline __attribute__((always_inline)) 00072 void lowI() {writeI(0);} 00082 inline __attribute__((always_inline)) 00083 void modeI(bool mode) { 00084 volatile uint8_t* ddrReg = pinReg_ + 1; 00085 *ddrReg = mode ? *ddrReg | bit_ : *ddrReg & mask_; 00086 } 00095 inline __attribute__((always_inline)) 00096 void writeI(bool level) { 00097 *portReg_ = level ? *portReg_ | bit_ : *portReg_ & mask_; 00098 } 00099 //============================================================================ 00106 inline __attribute__((always_inline)) 00107 void high() {ATOMIC_BLOCK(ATOMIC_FORCEON) {highI();}} 00114 inline __attribute__((always_inline)) 00115 void low() {ATOMIC_BLOCK(ATOMIC_FORCEON) {lowI();}} 00125 inline __attribute__((always_inline)) 00126 void mode(bool pinMode) {ATOMIC_BLOCK(ATOMIC_FORCEON) {modeI(pinMode);}} 00135 inline __attribute__((always_inline)) 00136 void write(bool level) {ATOMIC_BLOCK(ATOMIC_FORCEON) {writeI(level);}} 00137 //---------------------------------------------------------------------------- 00138 private: 00139 uint8_t bit_; 00140 uint8_t mask_; 00141 volatile uint8_t* pinReg_; 00142 volatile uint8_t* portReg_; 00143 }; 00144 #endif // PinIO_h 00145