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Glitch Explorer
Glitches can also be flagged as 'normal', in which case there is no highlight as in |2|. Finally the glitch could be flagged as an error, in which case it will be highlighted in red.
In order for the glitch explorer to receive the output value, you must insert the special code <code>$GLITCH$</code> into the ''Target Settings'' --&gt; ''Output Format'' settings. This will mean data Data is no longer still sent to the terminal emulator when using the capture 1 or capture multi buttonsso you can monitor what is happening, but instead is logged if you don't set the $GLITCH$ special string you won't see it in the glitch explorer window.
=== The Main Settings ===
Details of the main settings:
The number of tuning parameters is set at |1|. This defines how many different parameters to adjust.
The response of the system during normal operation is set at |2|''Normal response''. This defines what happens when no glitching or unexpected behavior happened.
The desired response of the system if the glitch was successful is set at |3|''Successful response''.
The expected and desired responses are expected to be Python expressions, where <code>s</code> is a str-type variable which contains the response of the system. The expression must evaulate to <code>True</code> or <code>False</code>. For example, the following shows examples of what you could use as possible expressions:
! Parameter Expression
| Check for &quot;hellonhello\n&quot; exactly.| s == &quot;hellonhello\n&quot;
| Check for &quot;hellonhello\n&quot; at end of string.| s.endswith(&quot;hellonhello\n&quot;)
| Check for hex 0xAF in last byte position.
=== Parameter Settings ===
Details of The actual parameters to change are set via a simple Python script. You will register this script to an appropriate section in the parameter system using the "auxiliary module". Using a script makes it easy to define all sorts of various settings:you might find of interest.
[[FileFor example the following script would insert code to cycle through width and offset settings:ge_bottom.png|image]]
The name of the parameter to be tuned is set at |1|. This name will be displayed in the table<syntaxhighlight lang=python>class IterateGlitchWidthOffset(object): def __init__(self, so should be some useful reminder of the parameter namege_window): self._starting_offset = -40 self._starting_width = 5 self.ge_window = ge_window
The ''Parameter Path'' at |2| defines what is modified. This string is simply copied from the ''Script Commands'' tab of the main window. This lets you modify ''any'' parameter of the GUI def reset_glitch_to_default(self, but most likely you will want to modify some of the scope, target, project): """ Set glitch settingsto defaults. """ self.offset = self._starting_offset self. The numeric value in this string should be deletedwidth = self._starting_width
The ''Data Format'' at |3| defines what type of data will be inserted into the parameter. For example for the ''Glitch Offset def change_glitch_parameters(as % of period)'' used hereself, this would need to be set to ''Float''scope, meaning fractional values such as &quot;4target, project): """ Example of simple glitch parameter modification function.5&quot; are allowed""" # This value is minimum clock offset/width increment self. The data format should match the data format expectedoffset += 0.390625
The ''Range'' at |4| defines the range from the minimum to maximum that will be swept for the parameter. Valid values depend on the parameter being adjusted. For example if you are adjusting the ''Glitch Offset'' a negative and positive self.offset makes sense, but if you were adjusting the ''Repeat'' it would only make sense to adjust over the range <code>(1,255)</code>40: self.offset = self._starting_offset self.width += 0.390625
The ''Value'' at |5| defines the starting value of the sweep if self. This is '''NOT''' automatically set to the minimum value of your sweepwidth > 40: self. If you want to perform the full sweep, you must manually set this to the minimum of the rangewidth = self._starting_width
The ''Step'' at |6| defines the amount the value is incremented on each # Write data to scope scope.glitch attempt. When the value reaches the maximum defined by the range, it will loop around to the minimum and continue incrementingwidth = self.width scope.glitch.offset = self.offset
The ''Repeat'' at |7| defines how many times to perform #You MUST tell the same value. This can be used to determine glitch explorer about the reliability of each updated settings if self.ge_window: self.ge_window.add_data("Glitch Width", scope.glitch.width) self.ge_window.add_data("Glitch Offset",scope.glitch value.offset)
If using multiple parametersglitch_iterator = IterateGlitchWidthOffset(self.glitch_explorer)self.aux_list.register(glitch_iterator.change_glitch_parameters, they will be looped as shown in this pseudo-code:"before_trace")self.aux_list.register(glitch_iterator.reset_glitch_to_default, "before_capture")
<pre/syntaxhighlight>param_value_0 = starting_value_0param_value_1 = starting_value_1
while capture_in_progress: while param_value_1 &lt; param_value_1_max:Note you can quickly cause very long captures to occur! To run the glitch explorer, you need to set the appropriate number of traces on the ''General Settings'' tab, and use the ''Capture Multi'' to run the glitch explorer.
while param_value_0 &lt; param_value_0_max: param_value_0 += param_value_0_incr run_glitch_here()  param_value_0 = param_value_0_min param_value_1 += param_value_1_incr  param_value_1 = param_value_1_min</pre>Note you can quickly cause very long captures to occur! To run the glitch explorer, you need to set the appropriate The ChipWhisperer system has no idea how many iterations are required with your code - it still uses a fixed number of traces on the ''General Settings'' tab, and use the ''Capture Multi'' to run captures by default. Later versions of the glitch explorerAPI will support an exit signal.
== Example Running the Glitch Explorer ==
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