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<h1 id="api-gpio-functions">API - GPIO Functions<a class="headerlink" href="#api-gpio-functions" title="Permanent link">&para;</a></h1>
<p>In this section the Python API reference for GPIO functions is described. This library is supported on both major versions
of Python: 2.x and 3.x.</p>
<hr />
<p><strong>IMPORTANT</strong></p>
<p>This library and the other ones too are not thread-safe. You cannot call the GrovePi from multiple threads or processes
as that will put the GrovePi into a broken state.</p>
<p>In case you need to reset the GrovePi from your Raspberry Pi, <a href="../fw/#resetting-the-grovepi">check this section</a>.</p>
<p>The functions don't verify if the input parameters are valid and therefore the parameters have to be verified/validated before that.
Calling a function with improper parameters can result in an undefined behavior for the GrovePi.</p>
<hr />
<h2 id="grovepidigitalreadpin"><code>grovepi.digitalRead(pin)</code><a class="headerlink" href="#grovepidigitalreadpin" title="Permanent link">&para;</a></h2>
<p>Reads whether a port's input is set high or low on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (D2-D8) from which to do the reading</li>
</ul>
<p><strong>Returns</strong>: <code>0</code> or <code>1</code> depending on the input value</p>
<hr />
<h2 id="grovepidigitalwritepin-value"><code>grovepi.digitalWrite(pin, value)</code><a class="headerlink" href="#grovepidigitalwritepin-value" title="Permanent link">&para;</a></h2>
<p>Sets the output value to either <code>0</code> or <code>1</code> to a digital port on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (D2-D8) to which to do the writing</li>
<li><code>value {Integer}</code> either <code>0</code> for 0 volts or <code>1</code> for maximum output voltage (usually 5 volts)</li>
</ul>
<p><strong>Returns</strong>: <code>1</code> all the time</p>
<hr />
<h2 id="grovepianalogreadpin"><code>grovepi.analogRead(pin)</code><a class="headerlink" href="#grovepianalogreadpin" title="Permanent link">&para;</a></h2>
<p>Detect an input voltage as a value from a given port on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (A0-A2) from which to do the reading</li>
</ul>
<p><strong>Returns</strong>: a 10-bit <code>{Integer}</code> number that maps to the input voltage on the port</p>
<hr />
<h2 id="grovepianalogwritepin-value"><code>grovepi.analogWrite(pin, value)</code><a class="headerlink" href="#grovepianalogwritepin-value" title="Permanent link">&para;</a></h2>
<p>Set an output voltage on a PWM-enabled port by mapping the value to the desired voltage on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (ports 3, 5, 6, 9) to which to do the writing</li>
<li><code>value {Integer}</code> an 8-bit number that maps from 0V to the referenced voltage of the GrovePi (5V)</li>
</ul>
<p><strong>Returns</strong>: <code>1</code> all the time</p>
<hr />
<h2 id="grovepipinmodepin-mode"><code>grovepi.pinMode(pin, mode)</code><a class="headerlink" href="#grovepipinmodepin-mode" title="Permanent link">&para;</a></h2>
<p>Sets a port to be either an OUTPUT or an INPUT port on the GrovePi.</p>
<p><strong>Parameters</strong></p>
<ul>
<li><code>pin {Integer}</code> a number to identify the port (D2-D8) to which to do the change</li>
<li><code>mode {String}</code> <code>"OUTPUT"</code> for writing values or <code>"INPUT"</code> for reading</li>
</ul>
<p><strong>Returns</strong>: <code>1</code> all the time</p>
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