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<div class="document">


<div class="system-message">
<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">_sources/9.0.rst</tt>, line 1)</p>
<p>Unknown directive type &quot;comment&quot;.</p>
<pre class="literal-block">
.. comment::
   the main title &quot;Programming ExpEYES using Python&quot; is removed
   It matters little for HTML help files, but it does matter for
   EPUB and PDF generated by Sphinx

</pre>
</div>
<p>The GUI programs described in the previous sections are meant for a
fixed set of experiments. To develop new experiments, one should know
how to access the features of expEYES from software. Important function
calls used for communicating with the device is given below.</p>
<div class="section" id="establish-connection">
<h1>Establish Connection</h1>
<p>To access the EYES17 hardware, the python modules for eyes17 must be
installed. They should be inside a directory named eyes17, that could be
in your home directory or on the Python PATH. <strong>Every program should
start with the following 2 lines</strong></p>
<pre class="code python literal-block">
<span class="keyword namespace">import</span> <span class="name namespace">eyes17.eyes</span>
<span class="name">p</span> <span class="operator">=</span> <span class="name">eyes17</span><span class="operator">.</span><span class="name">eyes</span><span class="operator">.</span><span class="name">open</span><span class="punctuation">()</span>
</pre>
<p>The variable <tt class="docutils literal">p</tt> is the software object, representing the hardware.</p>
<p>The following sections explains the Python function calls to access the
eyes17 hardware. Each function call will be explained with an example
usage.</p>
</div>
<div class="section" id="set-pv1-v-set-pv2-v">
<h1>set_pv1(v), set_pv2(v)</h1>
<p>Sets the DC voltages at PV1 and PV2. PV1 range is -5 to 5. PV2 range is
-3.3 to 3.3.</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">set_pv1</span><span class="punctuation">(</span><span class="literal number integer">4</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">set_pv2</span><span class="punctuation">(</span><span class="literal number integer">2</span><span class="punctuation">)</span>
</pre>
<p>The value set is printed. Measure the voltages using a meter.</p>
</div>
<div class="section" id="get-voltage-input">
<h1>get_voltage(input)</h1>
<p>Returns the voltage at the specified input.</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_voltage</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_voltage</span><span class="punctuation">(</span><span class="literal string single">'A2'</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_voltage</span><span class="punctuation">(</span><span class="literal string single">'A3'</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_voltage</span><span class="punctuation">(</span><span class="literal string single">'MIC'</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_voltage</span><span class="punctuation">(</span><span class="literal string single">'SEN'</span><span class="punctuation">)</span>
</pre>
<p>Connect PV1 to A1 and use the set_pv1() and get_voltage together. This
function sets the input range by trial</p>
<p>and error, depending on the input signal.</p>
</div>
<div class="section" id="get-voltage-time-input">
<h1>get_voltage_time(input)</h1>
<p>Returns a tuple, containing the computer's time stamp and the voltage at
the specified input</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_voltage_time</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">)</span>
</pre>
</div>
<div class="section" id="get-resistance">
<h1>get_resistance()</h1>
<p>Returns the value of resistance connected to SEN, it should be between
100 Ohm and 100k for reasonable accuracy.</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_resistance</span><span class="punctuation">()</span>
</pre>
</div>
<div class="section" id="get-capacitance">
<h1>get_capacitance()</h1>
<p>Returns the value of capacitance connected to IN1 (works well in pF
ranges)</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_capacitance</span><span class="punctuation">()</span>
</pre>
</div>
<div class="section" id="get-version">
<h1>get_version()</h1>
<p>Returns the version number of the Firmware</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_version</span><span class="punctuation">()</span>
</pre>
</div>
<div class="section" id="get-temperature">
<h1>get_temperature()</h1>
<p>Returns the temperature of the processor inside eyes17</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_temperature</span><span class="punctuation">()</span>
</pre>
</div>
<div class="section" id="set-state-ouput-value">
<h1>set_state(OUPUT=value)</h1>
<p>Sets the output of OD1, SQ1 etc. Connect OD1 to A1 and run</p>
<pre class="code python literal-block">
<span class="name">p</span><span class="operator">.</span><span class="name">set_state</span><span class="punctuation">(</span><span class="name">OD1</span><span class="operator">=</span><span class="literal number integer">1</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_voltage</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">)</span>
</pre>
</div>
<div class="section" id="set-sine-frequency">
<h1>set_sine(frequency)</h1>
<p>Generates the sinewave of requested frequency on WG (range from 5Hz to
5000Hz). All intermediate values are not possible, function returns the
actual value set.</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">set_sine</span><span class="punctuation">(</span><span class="literal number integer">502</span><span class="punctuation">)</span>
</pre>
<p>502.00803</p>
</div>
<div class="section" id="set-sine-amp-amplitude">
<h1>set_sine_amp(amplitude)</h1>
<p>The amplitude can be set to 3 pre-defined values of the peak voltage (
0-&gt; 80mV, 1-&gt; 1V, 2-&gt; 3V)</p>
<pre class="code python literal-block">
<span class="name">p</span><span class="operator">.</span><span class="name">set_sine_amp</span><span class="punctuation">(</span><span class="literal number integer">2</span><span class="punctuation">)</span>
</pre>
<p>Sets the amplitude to 3 volts peak.</p>
</div>
<div class="section" id="set-sqr1-frequency">
<h1>set_sqr1(frequency)</h1>
<p>Sets the frequency of SQ1 output (range from 4Hz to 1 MHz).All
intermediate values are not possible, function returns the actual value
set.</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">set_sqr1</span><span class="punctuation">(</span><span class="literal number integer">15030</span><span class="punctuation">)</span>
</pre>
<p>15030.53</p>
</div>
<div class="section" id="set-sqr1-slow-frequency">
<h1>set_sqr1_slow(frequency)</h1>
<p>Sets the frequency of SQ1 output (range from 0.1Hz to 1 MHz).All
intermediate values are not possible, function returns the actual value
set. Resolution is high but WG is disabled when SQ1 is operated in this
mode.</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">set_sqr1_slow</span><span class="punctuation">(</span><span class="literal number float">0.5</span><span class="punctuation">)</span>
</pre>
</div>
<div class="section" id="set-sqr2-frequency">
<h1>set_sqr2(frequency)</h1>
<p>Similar to set_sqr1() but SQ2 is not available along with WG, only one
at a time.</p>
</div>
<div class="section" id="set-sqr1-frequency-dutycyle">
<h1>set_sqr1(frequency, dutyCyle)</h1>
<p>Sets the frequency of SQ1 output (range from 0.1Hz to 1 MHz).All
intermediate values are not possible, function returns the actual value
set.</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">set_sqr1</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">,</span> <span class="literal number integer">30</span><span class="punctuation">)</span>          <span class="comment single"># 1000Hz with 30% duty cycle</span>
</pre>
</div>
<div class="section" id="get-freq-input">
<h1>get_freq(input)</h1>
<p>Measures the frequency of a square wave on the input, IN2 or SEN.
Connect SQ1 to IN2 and run the code</p>
<pre class="code python literal-block">
<span class="name">p</span><span class="operator">.</span><span class="name">set_sqr1</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">get_freq</span><span class="punctuation">(</span><span class="literal string single">'IN2'</span><span class="punctuation">)</span>
</pre>
</div>
<div class="section" id="duty-cycle-input">
<h1>duty_cycle(input)</h1>
<p>Measures the duty cycle a square wave on the input, IN2 or SEN. Connect
SQ1 to IN2 and run the code</p>
<pre class="code python literal-block">
<span class="name">p</span><span class="operator">.</span><span class="name">set_sqr1</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">,</span> <span class="literal number integer">30</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">duty_cycle</span><span class="punctuation">(</span><span class="literal string single">'IN2'</span><span class="punctuation">)</span>
</pre>
</div>
<div class="section" id="r2ftime-input1-input2">
<h1>r2ftime(input1, input2)</h1>
<p>Measures the time interval between a rising edge on input1 to another
one on input2, the inputs can be the same also. This can be tested using
a square wave.</p>
<p>Connect SQ1 to IN2 and run</p>
<pre class="code python literal-block">
<span class="name">p</span><span class="operator">.</span><span class="name">set_sqr1</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">,</span> <span class="literal number integer">30</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">r2ftime</span><span class="punctuation">(</span><span class="literal string single">'IN2'</span><span class="punctuation">,</span> <span class="literal string single">'IN2'</span><span class="punctuation">)</span>
</pre>
<p>0.0003</p>
<p>The 1kHz square wave with 30% duty cycle has a Period of one millisecond
and stays HIGH for .3 milliseconds.</p>
</div>
<div class="section" id="multi-r2rtime-input-numcycles">
<h1>multi_r2rtime(input, numCycles)</h1>
<p>Measures the time interval between rising edges on input1. Time between
2 edges is one cycle. Number of cycles to be measured also can be
specified, default value is 1. The allowed values are 1,2,4,8,12,16,32
and 48. This can be tested using a square wave.</p>
<p>Connect SQ1 to IN2 and run</p>
<pre class="code python literal-block">
<span class="name">p</span><span class="operator">.</span><span class="name">set_sqr1</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">)</span>
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">multi_r2rtime</span><span class="punctuation">(</span><span class="literal string single">'IN2'</span><span class="punctuation">,</span> <span class="literal number integer">8</span><span class="punctuation">)</span>
</pre>
<p>0.008</p>
</div>
<div class="section" id="select-range-channel-range">
<h1>select_range(channel, range)</h1>
<p>The input range of A1 and A2 can be set from ±0.5V to ±16V
fullscale, using the programmable gain amplifiers.</p>
<pre class="code python literal-block">
<span class="name">p</span><span class="operator">.</span><span class="name">select_range</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">4</span><span class="punctuation">)</span>         <span class="comment single"># 4volt maximum</span>
<span class="name">p</span><span class="operator">.</span><span class="name">select_range</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">8</span><span class="punctuation">)</span>         <span class="comment single"># 8 volt maximum</span>
</pre>
</div>
<div class="section" id="id1">
<h1>select_range(channel, range)</h1>
<p>The input range of A1 and A2 can be set from ±0.5V to ±16V
fullscale, using the programmable gain amplifiers.</p>
<pre class="code python literal-block">
<span class="name">p</span><span class="operator">.</span><span class="name">select_range</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">4</span><span class="punctuation">)</span>         <span class="comment single"># 4volt maximum</span>
<span class="name">p</span><span class="operator">.</span><span class="name">select_range</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">8</span><span class="punctuation">)</span>         <span class="comment single"># 8 volt maximum</span>
</pre>
</div>
<div class="section" id="capture1-input-number-of-samples-time-interval">
<h1>capture1(Input, Number of samples, time interval)</h1>
<p>Digitizes the specified input. The number of samples could be upto
10000. The time gap between two consecutive samples id given in
microseconds (range 2 to 1000 usec).</p>
<pre class="code python literal-block">
<span class="keyword">print</span> <span class="name">p</span><span class="operator">.</span><span class="name">capture1</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">5</span><span class="punctuation">,</span> <span class="literal number integer">5</span><span class="punctuation">)</span>
</pre>
<p>will print two arrays of time and voltage.</p>
<p>We need to plot the graph of the output for a better understanding. This
can be done using the matplotlib module, imported using the pylab
interface. Connect WG to A1 with a wire and run;</p>
<pre class="code python literal-block">
<span class="keyword namespace">from</span> <span class="name namespace">pylab</span> <span class="keyword namespace">import</span> <span class="operator">*</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_sine_amp</span><span class="punctuation">(</span><span class="literal number integer">2</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_sine</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">select_range</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">4</span><span class="punctuation">)</span>
<span class="name">t</span><span class="punctuation">,</span><span class="name">v</span> <span class="operator">=</span> <span class="name">p</span><span class="operator">.</span><span class="name">capture1</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">300</span><span class="punctuation">,</span> <span class="literal number integer">10</span><span class="punctuation">)</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">t</span><span class="punctuation">,</span><span class="name">v</span><span class="punctuation">)</span>
<span class="name">show</span><span class="punctuation">()</span>
</pre>
<p>The output of this code is given below.</p>
<img alt="pics/sine-mpl-screen.png" src="pics/sine-mpl-screen.png" style="width: 400px;" />
</div>
<div class="section" id="capture2-number-of-samples-time-interval">
<h1>capture2(Number of samples, time interval)</h1>
<p>Digitizes the inputs A1 and A2 together. The number of samples could be
upto 10000. The time gap between two consecutive samples id given in
microseconds (range 2 to 1000 usec).</p>
<p>Connect WG to A1 and a diode from A1 to A2. Run the code below</p>
<pre class="code python literal-block">
<span class="keyword namespace">from</span> <span class="name namespace">pylab</span> <span class="keyword namespace">import</span> <span class="operator">*</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_sine_amp</span><span class="punctuation">(</span><span class="literal number integer">2</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_sine</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">select_range</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">4</span><span class="punctuation">)</span>
<span class="name">t</span><span class="punctuation">,</span><span class="name">v</span><span class="punctuation">,</span><span class="name">tt</span><span class="punctuation">,</span><span class="name">vv</span> <span class="operator">=</span> <span class="name">p</span><span class="operator">.</span><span class="name">capture2</span><span class="punctuation">(</span><span class="literal number integer">300</span><span class="punctuation">,</span> <span class="literal number integer">10</span><span class="punctuation">)</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">t</span><span class="punctuation">,</span><span class="name">v</span><span class="punctuation">)</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">tt</span><span class="punctuation">,</span><span class="name">vv</span><span class="punctuation">)</span>
<span class="name">show</span><span class="punctuation">()</span>
</pre>
<p>The output of this code is given below.</p>
<img alt="pics/halfwave-mpl-screen.png" src="pics/halfwave-mpl-screen.png" style="width: 400px;" />
</div>
<div class="section" id="capture4-number-of-samples-time-interval">
<h1>capture4(Number of samples, time interval)</h1>
<p>Digitizes the inputs A1,A2,A3 and MIC together. The number of samples
could be upto 10000. The time gap between two consecutive samples id
given in microseconds (range 2 to 1000 usec).</p>
<p>Connect WG to A3 and run the code given below. Result is shown above.</p>
<pre class="code python literal-block">
<span class="keyword namespace">from</span> <span class="name namespace">pylab</span> <span class="keyword namespace">import</span> <span class="operator">*</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_sine_amp</span><span class="punctuation">(</span><span class="literal number integer">2</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_sine</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">select_range</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">4</span><span class="punctuation">)</span>
<span class="name">res</span> <span class="operator">=</span> <span class="name">p</span><span class="operator">.</span><span class="name">capture4</span><span class="punctuation">(</span><span class="literal number integer">300</span><span class="punctuation">,</span> <span class="literal number integer">10</span><span class="punctuation">)</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">res</span><span class="punctuation">[</span><span class="literal number integer">4</span><span class="punctuation">],</span><span class="name">res</span><span class="punctuation">[</span><span class="literal number integer">5</span><span class="punctuation">])</span>        <span class="comment single"># A3</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">res</span><span class="punctuation">[</span><span class="literal number integer">6</span><span class="punctuation">],</span><span class="name">res</span><span class="punctuation">[</span><span class="literal number integer">7</span><span class="punctuation">])</span>        <span class="comment single"># MIC</span>
<span class="name">show</span><span class="punctuation">()</span>
</pre>
<img alt="pics/capture4-mpl-screen.png" src="pics/capture4-mpl-screen.png" style="width: 400px;" />
</div>
<div class="section" id="set-wave-frequency-wavetype">
<h1>set_wave(frequency, wavetype)</h1>
<p>If wavetype is not specified, it generates the waveform using the
existing wave table. If wavetype is specified ('sine' or 'tria')</p>
<p>corresponding wavetable is loaded.</p>
<pre class="code python literal-block">
<span class="keyword namespace">from</span> <span class="name namespace">pylab</span> <span class="keyword namespace">import</span> <span class="operator">*</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_wave</span><span class="punctuation">(</span><span class="literal number integer">1000</span><span class="punctuation">,</span> <span class="literal string single">'sine'</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_wave</span><span class="punctuation">(</span><span class="literal number integer">100</span><span class="punctuation">)</span>       <span class="comment single"># Sets 100Hz using the existing table</span>
<span class="name">x</span><span class="punctuation">,</span><span class="name">y</span> <span class="operator">=</span> <span class="name">p</span><span class="operator">.</span><span class="name">capture1</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">500</span><span class="punctuation">,</span><span class="literal number integer">50</span><span class="punctuation">)</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">x</span><span class="punctuation">,</span><span class="name">y</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_wave</span><span class="punctuation">(</span><span class="literal number integer">100</span><span class="punctuation">,</span> <span class="literal string single">'tria'</span><span class="punctuation">)</span>  <span class="comment single"># Sets triagular wave table and generates 100Hz</span>
<span class="name">x</span><span class="punctuation">,</span><span class="name">y</span> <span class="operator">=</span> <span class="name">p</span><span class="operator">.</span><span class="name">capture1</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">500</span><span class="punctuation">,</span><span class="literal number integer">50</span><span class="punctuation">)</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">x</span><span class="punctuation">,</span><span class="name">y</span><span class="punctuation">)</span>
<span class="name">show</span><span class="punctuation">()</span>
</pre>
</div>
<div class="section" id="load-equation-function-span">
<h1>load_equation(function, span)</h1>
<p>Makes the wave table using the quation. Connect WG to A1 and run the
code below. The output also is shown below.</p>
<pre class="code python literal-block">
<span class="keyword namespace">from</span> <span class="name namespace">pylab</span> <span class="keyword namespace">import</span> <span class="operator">*</span>

<span class="keyword">def</span> <span class="name function">f1</span><span class="punctuation">(</span><span class="name">x</span><span class="punctuation">):</span>
    <span class="keyword">return</span> <span class="name">sin</span><span class="punctuation">(</span><span class="name">x</span><span class="punctuation">)</span> <span class="operator">+</span> <span class="name">sin</span><span class="punctuation">(</span><span class="literal number integer">3</span><span class="operator">*</span><span class="name">x</span><span class="punctuation">)</span><span class="operator">/</span><span class="literal number integer">3</span>

<span class="name">p</span><span class="operator">.</span><span class="name">load_equation</span><span class="punctuation">(</span><span class="name">f1</span><span class="punctuation">,</span> <span class="punctuation">[</span><span class="operator">-</span><span class="name">pi</span><span class="punctuation">,</span><span class="name">pi</span><span class="punctuation">])</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_wave</span><span class="punctuation">(</span><span class="literal number integer">400</span><span class="punctuation">)</span>
<span class="name">x</span><span class="punctuation">,</span><span class="name">y</span> <span class="operator">=</span> <span class="name">p</span><span class="operator">.</span><span class="name">capture1</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">500</span><span class="punctuation">,</span><span class="literal number integer">10</span><span class="punctuation">)</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">x</span><span class="punctuation">,</span><span class="name">y</span><span class="punctuation">)</span>
<span class="name">show</span><span class="punctuation">()</span>
</pre>
</div>
<div class="section" id="load-table-function-span">
<h1>load_table(function, span)</h1>
<p>The wave table can be loaded with a 512 element array. Connect WG to A1
and run the code below. After taking the absolute value, the table
starts with 256, goes down to zero and then goes upto 255, tracing a
triagular wave. The tableoutput also is shown above.</p>
<pre class="code python literal-block">
<span class="keyword namespace">from</span> <span class="name namespace">pylab</span> <span class="keyword namespace">import</span> <span class="operator">*</span>
<span class="name">x</span> <span class="operator">=</span> <span class="name">arange</span><span class="punctuation">(</span><span class="operator">-</span><span class="literal number integer">256</span><span class="punctuation">,</span> <span class="literal number integer">256</span><span class="punctuation">)</span>
<span class="name">x</span> <span class="operator">=</span> <span class="name builtin">abs</span><span class="punctuation">(</span><span class="name">x</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">load_table</span><span class="punctuation">(</span><span class="name">x</span><span class="punctuation">)</span>
<span class="name">p</span><span class="operator">.</span><span class="name">set_wave</span><span class="punctuation">(</span><span class="literal number integer">400</span><span class="punctuation">)</span>
<span class="name">x</span><span class="punctuation">,</span><span class="name">y</span> <span class="operator">=</span> <span class="name">p</span><span class="operator">.</span><span class="name">capture1</span><span class="punctuation">(</span><span class="literal string single">'A1'</span><span class="punctuation">,</span> <span class="literal number integer">500</span><span class="punctuation">,</span><span class="literal number integer">10</span><span class="punctuation">)</span>
<span class="name">plot</span><span class="punctuation">(</span><span class="name">x</span><span class="punctuation">,</span><span class="name">y</span><span class="punctuation">)</span>
<span class="name">show</span><span class="punctuation">()</span>
</pre>
<img alt="pics/load-equation-mpl-screen.png" src="pics/load-equation-mpl-screen.png" style="width: 400px;" />
<img alt="pics/load-table-mpl-screen.png" src="pics/load-table-mpl-screen.png" style="width: 400px;" />
</div>
</div>
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