Obtaining a cycle count
Obtaining a cycle count for a given section of code is easily
accomplished with the aid of Code Composer. Here is theprocedure for obtaining a cycle count:
- Load the
.out file of the program you wish to
profile into Code Composer.
- Set a breakpoint at the beginning of the section of code
that you want to profile. This can be easily done byright-clicking on the line of code beginning the section and
choosing "Toggle breakpoint" from the list of options.
- Set a breakpoint at the end of the the section of code that
you want to profile.
- Open the "Profiler" menu in Code Composer. Choose "View
Clock." A window should open at the bottom of the CodeComposer window that indicates the current value of the
cycle counter.
- Again, open the "Profiler" menu in Code Composer and choose
"Enable Clock."
- Choose "Run" from the "Debug" menu to execute your code.
Execution will halt at the first breakpoint. Double-clickthe cycle counter to reset its value to zero (double click
the number next to "Clock =").
- Again, choose "Run" from the "Debug" menu to continue
execution of your code. Execution will halt at the secondbreakpoint and the cycle counter will display the number of
CPU cycles that were needed to execute the section of codedelimited by the breakpoints.
This is a two week lab. Your prelab is due a week after the
quiz for Lab 4 and the quizzing occurs two weeks after thequiz for Lab 4.
The following details how the 10 points for the lab will be
assigned:
- 1 point: Prelab. You must answer the prelab questions for
two filtering techniques in
Filtering Techniques . You must
fully simulate one filtering technique in MATLAB anddemonstrate that the system will meet the specifications as
given in the
filter
specification . Finite precision effects such as
coefficient quantization must be modeled in your simulation.You must provide the response of your simulated system to
appropriate test inputs.
- 2 points: Working code. Code that does not meet the
specification is not considered working code. You must beprepared to demonstrate that your code meets the
specification by showing the system response to a frequencyswept sine input. We will check that the ripple
specifications have been met in the pass-band and thestop-band. We will also check the for the locations of the
pass-band and stop-band edges to make sure that the width ofthe transition band is met. We will also check to see that
the phase constraint given in the specification is met. Wewill also check to ensure that you have scaled the input
signal appropriately so that clipping does not occur at theoutput for any frequency. Additionally, we will check to
make sure that you do not scale the input tooconservatively, specifically, a 1 V amplitude sinusoidal
input is not allowed to drop below 0.5 V in amplitude at theoutput for all frequencies in the pass-band.
- 2 points: Oral quiz.
- 5 points: Optimization. These points will be assigned
based on your cycle count. You will be judged relative toyour peers. Code that does not meet the specification will
be penalized. After all the cycle counts have beencollected, we will order them for scoring in two ways.
First, the cycle counts will be ordered globally over thewhole class. The groups with the lowest numbered cycle
counts will be given the maximum number of points and thegroups with the highest numbered cycle counts will be given
the minimum number of points. The second ordering will bedone locally relative to which of the three filtering
techniques the groups have picked. The groups using thesame filtering technique will be ordered by cycle count,
with the groups with the lowest cycle counts receivingmaximum points and the groups with the highest cycle counts
receiving minimum points. 3 points will be assigned forthe global ordering of groups and 2 points for the local
ordering with respect to filtering technique of groups.
Pizza competition
Your final assembly code and/or C source code for the pizza
competition must be emailed to
ece320@ews.uiuc.edu no
later than 11:59 PM on Monday, March 17. However, youroptimization grade will be assigned based on the code turned
in during your assigned lab section and is subject to theusual polices for late code.
