211 lines
8.3 KiB
HTML
211 lines
8.3 KiB
HTML
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<title>SPI \ Language (API) \ Processing 2+</title>
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<meta name="Author" content="Processing Foundation" />
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<meta name="Keywords" content="Processing, Sketchbook, Programming, Coding, Code, Art, Design" />
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<meta name="Description" content="Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology." />
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<meta name="Copyright" content="All contents copyright the Processing Foundation, Ben Fry, Casey Reas, and the MIT Media Laboratory" />
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<li class="highlight"><a href="http://processing.org/">Processing</a></li>
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<li><a href="http://py.processing.org/">Processing.py</a></li>
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<a href="../../index.html" >Language</a><br>
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<a href="../../libraries/index.html" class='active'>Libraries</a><br>
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<a href="../../tools/index.html">Tools</a><br>
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<!-- ==================================== CONTENT - Headers ============================ -->
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<div class="content">
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<p class="ref-notice">This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, <a href="https://github.com/processing/processing-docs/issues?state=open">please let us know</a>. If you prefer a more technical reference, visit the <a href="http://processing.github.io/processing-javadocs/core/">Processing Core Javadoc</a> and <a href="http://processing.github.io/processing-javadocs/libraries/">Libraries Javadoc</a>.</p>
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>SPI</h3></td>
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</tr>
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<tr class=""><th scope="row">Examples</th><td><div class="example"><pre >
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import processing.io.*;
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SPI adc;
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void setup() {
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//printArray(SPI.list());
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adc = new SPI(SPI.list()[0]);
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adc.settings(500000, SPI.MSBFIRST, SPI.MODE0);
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}
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void draw() {
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// read in values over SPI from an analog-to-digital
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// converter
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// dummy write, actual values don't matter
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byte[] out = { 0, 0 };
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byte[] in = adc.transfer(out);
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// some input bit shifting according to the datasheet
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int val = ((in[0] & 0x1f) << 5) | ((in[1] & 0xf8) >> 3);
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// val is between 0 and 1023
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println(val);
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}
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</pre></div>
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</td></tr>
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<tr class="">
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<th scope="row">Description</th>
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<td>
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Opens an SPI interface as master<br/>
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</br>
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Serial Peripheral Interface (SPI) is a serial bus, commonly used to communicate
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with sensors and memory devices. It uses four pins: MOSI (Master Out Slave In),
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MISO (Master In Slave Out), and SCLK (clock signal) - those three are shared
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among all devices on the bus - as well as one or more SS (Slave Select) pins,
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that are used for the master to signal to the slave device that it is the
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desired respondent for the transmission.<br/>
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<br/>
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The "master" device initiates a transfer by pulling the SS pin of the "slave"
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low, and begins outputting a clock signal. In SPI, both the "master" as well as
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the "slave" device output data at the same time. It is hence not possible to
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read data without writing some (even if it means outputting zeros or other
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dummy data).</br>
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</br>
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There are multiple possible configuration settings for SPI, see
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<a href="SPI_settings_.html">settings()</a> for details.</br>
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<br/>
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This library supports multiple SPI objects making use of the same SPI
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interface.
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</td>
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</tr>
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<tr class=""><th scope="row">Methods</th><td><table cellpadding="0" cellspacing="0" border="0"><tr class="">
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<th scope="row"><a href="SPI_close_.html">close()</a></th>
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<td>Closes the SPI interface</td>
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</tr>
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<tr class="">
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<th scope="row"><a href="SPI_list_.html">list()</a></th>
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<td>Lists all available SPI interfaces</td>
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</tr>
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<tr class="">
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<th scope="row"><a href="SPI_settings_.html">settings()</a></th>
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<td>Configures the SPI interface</td>
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</tr>
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<tr class="">
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<th scope="row"><a href="SPI_transfer_.html">transfer()</a></th>
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<td>Transfers data over the SPI bus</td>
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</tr></table></td></tr>
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<tr class=""><th scope="row">Constructor</th><td><pre>SPI(<kbd>dev</kbd>)
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</pre></td></tr>
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<tr class=""> <th scope="row">Parameters</th><td><table cellpadding="0" cellspacing="0" border="0"><tr class="">
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<th scope="row" class="code">dev</th>
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<td>String: device name</td>
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</tr></table></td> </tr>
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</table>
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Updated on April 30, 2017 02:33:20pm EDT<br /><br />
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