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70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/*
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Copyright (c) 2011 Arduino. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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.
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See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _WIRING_DIGITAL_
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#define _WIRING_DIGITAL_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Configures the specified pin to behave either as an input or an output. See the description of digital pins for details.
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*
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* \param ulPin The number of the pin whose mode you wish to set
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* \param ulMode Either INPUT or OUTPUT
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*/
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extern void pinMode( uint32_t dwPin, uint32_t dwMode ) ;
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/**
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* \brief Write a HIGH or a LOW value to a digital pin.
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*
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* If the pin has been configured as an OUTPUT with pinMode(), its voltage will be set to the
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* corresponding value: 5V (or 3.3V on 3.3V boards) for HIGH, 0V (ground) for LOW.
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*
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* If the pin is configured as an INPUT, writing a HIGH value with digitalWrite() will enable an internal
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* 20K pullup resistor (see the tutorial on digital pins). Writing LOW will disable the pullup. The pullup
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* resistor is enough to light an LED dimly, so if LEDs appear to work, but very dimly, this is a likely
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* cause. The remedy is to set the pin to an output with the pinMode() function.
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*
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* \note Digital pin PIN_LED is harder to use as a digital input than the other digital pins because it has an LED
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* and resistor attached to it that's soldered to the board on most boards. If you enable its internal 20k pull-up
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* resistor, it will hang at around 1.7 V instead of the expected 5V because the onboard LED and series resistor
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* pull the voltage level down, meaning it always returns LOW. If you must use pin PIN_LED as a digital input, use an
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* external pull down resistor.
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*
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* \param dwPin the pin number
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* \param dwVal HIGH or LOW
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*/
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extern void digitalWrite( uint32_t dwPin, uint32_t dwVal ) ;
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/**
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* \brief Reads the value from a specified digital pin, either HIGH or LOW.
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*
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* \param ulPin The number of the digital pin you want to read (int)
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*
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* \return HIGH or LOW
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*/
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extern int digitalRead( uint32_t ulPin ) ;
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#ifdef __cplusplus
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}
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#endif
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#endif /* _WIRING_DIGITAL_ */
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