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<title>Protocol Parser for Software Logic 2 of the company Saleae</title>
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<body class="article">
<div id="header">
<h1>Protocol Parser for Software <a href="https://www.saleae.com/downloads/">Logic 2</a> of the company Saleae</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Johannes Hanuja <<a href="mailto:[email protected]">[email protected]</a>></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The Software <a href="https://www.saleae.com/downloads/">Logic 2</a> has an extension Tab where Developers can create their own Extensions for the software with the python programming language. This document contains an overview about a possibility for creating High Level Analyzers using the API of the <a href="https://www.saleae.com/downloads/">Logic 2</a>-Software. A concrete implementation of a Protocol Parser can be found in this <a href="https://github.com/JHanuja/Saleae-Logic-2-Mavlink-Extension">Github Repository</a>, which contains a Parser for the Mavlink Protocol.</p>
</div>
<div class="sect2">
<h3 id="_the_general_functionality_of_a_parser_extension">The general functionality of a Parser extension</h3>
<div class="paragraph">
<p>The Api consists of a method with the following Signature:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">def decode(self, frame: AnalyzerFrame)</code></pre>
</div>
</div>
<div class="paragraph">
<p>An Analyzer frame has a start_time and end_time and the method gets called for every byte in the stream. Reading the value of an Analyzer Frame as an integer can be done in the following way:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">int.from_bytes(frame.data['data'],"little")</code></pre>
</div>
</div>
<div class="paragraph">
<p>We need to define result types in order to create our own Analyzer Frames which get displayed in the Software. A simple example for a Result Type can be defined as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">'Field': {'format': 'Field:{{data.name}}, Value:{{data.input}}'}</code></pre>
</div>
</div>
<div class="paragraph">
<p>In order to show how to create an Analyzer Frame for a specific Byte (frame) in the stream, see the following example:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">AnalyzerFrame('Field',frame.start_time,frame.end_time,{
'name': "Buffer",
'input': int.from_bytes(frame.data['data'],"little")
})</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_creating_a_parser_for_a_typical_protocol">Creating a parser for a typical Protocol</h3>
<div class="paragraph">
<p>Let’s assume we want to parse a packet of a typical protocol which starts with a field of a specific value (STX) and ends with a checksum. The first thing we need is a class which represents a field:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">class Field(object):
def __init__(self,start_time,end_time,value):
self.start_time = start_time
self.end_time = end_time
self.value = value`</code></pre>
</div>
</div>
<div class="paragraph">
<p>Then we need a global list for all field series which could be a valid packet and the definition of the STX Value</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">STX = 254
allFieldSeries = []</code></pre>
</div>
</div>
<div class="paragraph">
<p>Let’s implement the decode function as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">def decode(self, frame: AnalyzerFrame):
if (int.from_bytes(frame.data['data'],"little")) == STX:
field = Field(frame.start_time,frame.end_time,(int.from_bytes(frame.data['data'],"little")))
for fieldSeries in self.allFieldSeries:
fieldSeries.append(field)
newFieldSeries = []
newFieldSeries.append(field)
self.allFieldSeries.append(newFieldSeries)
else:
field = Field(frame.start_time,frame.end_time,(int.from_bytes(frame.data['data'],"little")))
for fieldSeries in self.allFieldSeries:
fieldSeries.append(field)
frame = self.createFramesIfValid()
return frame</code></pre>
</div>
</div>
<div class="paragraph">
<p>A packet always starts with the value of STX. So basically in the if case we append the field to every existing fieldseries which could be a valid packet. We also start a new fieldseries and append this fieldseries to the global list of fieldseries. The reason for doing that is because the STX value can appear as a value in a packet as well.</p>
</div>
<div class="paragraph">
<p>In the else case we just add the new field to all existing field series.</p>
</div>
<div class="paragraph">
<p>Let’s have a look at the method createFrameIfValid.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-python" data-lang="python">def createFramesIfValid(self):
values = []
for fieldSeries in self.allFieldSeries:
for field in fieldSeries:
values.append(packet.value)
f = Decoder()
try:
tested = f.decode(bytearray(values))
self.allFieldSeries.clear()
return self.createFrames(tested,fieldSeries)
except:
values.clear()
return []</code></pre>
</div>
</div>
<div class="paragraph">
<p>So basically we check all our fieldseries for a valid packet by using a protocol specific Decoder. The decoder throws an Exception if the fieldseries is not a valid packet. Otherwise it returns the decoded packet. If no exception is thrown, we have a valid packet and we can delete all existing fieldseries. After that we call a protocol specific Method createFrames with the decoded message and the corresponding fieldseries as arguments. In this method we have all necessary information to create the protocol specific frames.</p>
</div>
</div>
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Last updated 2022-11-26 18:27:28 +0100
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