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.. highlight:: cpp
.. _arduino-pinmode:
pinMode()
=========
.. doxygenfunction:: pinMode
.. doxygenenum:: WiringPinMode
Discussion
----------
pinMode() is usually called within :ref:`arduino-setup` in order to
configure a pin for a certain usage (although it may be called from
anywhere).
Example
-------
::
int ledPin = 13; // LED connected to digital pin 13
void setup()
{
pinMode(ledPin, OUTPUT); // sets the digital pin as output
}
void loop()
{
digitalWrite(ledPin, HIGH); // sets the LED on
delay(1000); // waits for a second
digitalWrite(ledPin, LOW); // sets the LED off
delay(1000); // waits for a second
}
Arduino Compatibility Note
--------------------------
The libmaple implementation of pinMode() supports OUTPUT and INPUT
modes with a meaning identical to that of the Arduino function.
INPUT_ANALOG and PWM modes were added because the Maple does not
distinguish between analog and digital pins the same way the Arduino
does. Unlike the Arduino, you **must call pinMode**\ () to set up a pin
for these purposes before a call to, e.g., :ref:`arduino-analogRead`.
In practice, this should only add a few lines of pinMode() calls to
your :ref:`arduino-setup` function.
OUTPUT_OPEN_DRAIN, INPUT_PULLUP, INPUT_PULLDOWN, and PWM_OPEN_DRAIN
modes represent functionality not currently available on Arduino
boards.
See also
--------
- :ref:`arduino-constants`
- :ref:`arduino-digitalwrite`
- :ref:`arduino-digitalread`
- Maple :ref:`GPIO <gpio>` reference page
- Arduino `pinMode() <http://www.arduino.cc/en/Reference/PinMode>`_ reference
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