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C51, C251, C166 Development Tools
Event Viewer
The Event Viewer displays thread, interrupt, and exception
execution over time. To display the timing information it uses trace
information generated by Cortex-M3, M4, M7 devices and requires a
suitable debug adapter, for example ULINKpro.
Prerequisites for using the Event Viewer
-
Configure the target as described in
-
Using the Trace Configuration dialog of these adapters
you should configure the following:
- Enable Timestamps to obtain timing information.
-
To display thread switches, enable ITM Stimulus Port
31.
-
To display interrupts and exceptions, enable Trace
Events - EXCTRC: Exception Tracing.
Open the window with Debug - OS Support - Event Viewer.

Where
-
Thread and exception names (with IDs) are displayed on the left
side of the window. Threads have alternating gray, and exceptions
have alternating blue colors. The highlighted entry is enabled for
navigation with keyboard keys. Selecting All Threads allows
you to navigate over all threads and exceptions.
-
The time range is displayed on the bottom border of the
window.
Load... imports the thread- and exception-switching history
previously saved in a file (*.UVTSK). Data can be analyzed
off-line.
Save... stores the thread- and exception-switching history
in a file (*.UVTSK) for future analysis.
? opens this help.
Time fields show:
-
Min Time is the first timestamp of the recording buffer.
The time starts at zero and keeps rolling forward while µVision
records the threads.
-
Max Time is the last timestamp of the recording buffer.
It shows the time past since signal recording started.
- Grid is the time interval between two grid lines.
Zoom buttons change the time scale:
-
In zooms into the threads to get a detailed view at the
Reference Line. The time interval between two grid lines
gets smaller.
-
Out zooms out of the signals for a better overview at
the Reference Line. The time interval between two grid lines
gets larger.
-
All shows the complete content of the recording
buffer.
Update Screen buttons control the screen output.
-
Stop freezes the data of the graphical display. µVision
continues filling the recording buffer. When clicked, the button
changes its boilerplate text to Start.
-
Start unfreezes the graphical display. The data of the
recording buffer and the incoming data are shown. When clicked, the
button changes its boilerplate text to Stop.
-
Clear empties the recording buffer and clears the Event
Viewer display area.
Jump to buttons synchronize the event with:
-
Code opens the disassembly or source code window at the
code line where the thread starts.
-
Trace opens the windows Trace Data and the Trace
Navigation. Data get synchronized between the windows.
Transition buttons snap the Reference Line to the
next transition point. Highlight a thread name and click:
-
Prev to move the Reference Line to the previous
transition point, or press the Left-Arrow key.
-
Next to move the Reference Line to the succeeding
transition point, or press the Right-Arrow key.
Checkboxes
-
Cursor enables a Mouse Cursor Line, which moves
with the mouse. Mouse position data and deltas to the Reference
Line are displayed on the timestamp axis.
-
Show Cycles enables cycle information, which are
displayed on the timestamp axis.
-
Timing Info enables event details while hovering the mouse
over an event transition.

The tooltip shows timing information based on the slice you
have selected. At the top, it shows the name and ID of the thread
or exception. Thread information is extended with the start
address.
Current Slice shows the slice number, based on the
event count and on the beginning of the viewable buffer. No.
44 in the picture is the 44th slice of the thread
phaseA relative to the start of the viewable buffer. The
first viewable slice has always the number one. The slice starts
at Begin seconds, lasts until End seconds, and has
the Duration of micro seconds. This line is not displayed
when hovered over a free space.
All Slices shows the total amount of viewable time
slices. The slices have a minimum duration of Min, maximum
duration of Max, and an average duration of
Average.
Cursors information are shown for the mouse and
Reference Line. When the Reference Line has been set, the tooltip
shows the time difference between the Reference Line position and
mouse position in seconds and frequency (Hz).
All Threads graph
The All Threads graph shows event-switching occurrences
with a blue X.
Blue opening brackets <
(left red circle in the picture) indicate event-switching occurrences
that cannot be resolved on the graphical scale. You can zoom-in at
those points to view detailed event switches.
The red opening bracket <
(right red circle in the picture) indicates event-switching
occurrences that cannot be resolved on the graphical and time scale.
Zooming in at those points will not deliver details on the time
scale. The events are shown as if occurred at the same time. This is
due to lack of timing information. Select a smaller number for
Timestamps Prescaler in Options for Target - Debug -
Settings - Trace.
Additional mouse and key commands
-
One mouse click into the display area sets the
Reference Line.
-
A double-click into the display area switches off the
Reference Line.
- The mouse wheel zooms in and out at mouse position.
-
Shift+mouse move snaps the Mouse Cursor
Line to the next or previous transition point of the thread to
which the mouse is pointing. The transition point has to be visible
in the window.
-
Press the Up- and Down-Arrow keys to highlight
the next thread.
-
A double-click on a thread or interrupt name changes the
graphic shape.
- HOME jumps to the start of recording.
-
END jumps to the end of recording and locks Scrollbar
(newest records always shown).