EE382C Embedded Software Systems - Hints for Homework #3

For the programming parts of the homework assignments, please e-mail the source code and a makefile (if there are multiple source code files) to the grader.

Homework #3.

Xgraph block: The Xgraph block in Ptolemy will call the pxgraph program to plot the data. The pxgraph program in Ptolemy 0.7.1 is a shell script that by default calls a Java program written in version 1.0 of the Java Developer's Kit (JDK). To use JDK 1.0, please set the following in your login scripts:
```
# C shell
setenv JAVA /usr/local/packages/java1.1
setenv JAVA_LIB $JAVA/lib/sparc
setenv JAVAHOME $JAVA
```
or
```
# Korn shell
JAVA=/usr/local/packages/java1.1
JAVA_LIB=$JAVA/lib/sparc
JAVAHOME=$JAVA
export JAVA JAVA_LIB JAVAHOME
```
If the Xgraph block still gives an error, then revert back to the binary program for pxgraph in Ptolemy Classic 0.7:
```
mkdir -p ~/bin/sol2.5
cp /usr/local/packages/ptolemy0.7/bin.sol2.5/pxgraph ~/bin/sol2.5
rehash
which pxgraph
```
The last line should return a path equal to $HOME/bin/sol2.5. Otherwise, you will need to add $HOME/bin/sol2.5 to your path before the Ptolemy directories.
Problem 3.1: The Motorola 56000 tools seem to have been removed from /usr/local/packages on the LRC Solaris machines. Please add the following line to your .cshrc file:
```
set path=(/home/ecelrc/faculty/bevans/Motorola/clas56/bin $path)
```
The demonstration to run is under CG56 ... Simulator ... DTMFCodec. You can enlarge the icons by resizing the window and hitting the keyboard shortcut 'f' for full size.
(a) The program and data memory usage should be reported by default. Recall that the Motorola 56000 has a modified Harvard architecture with two data memory banks (x and y) and a program memory bank (p).
(c) Please use the maximum clock speed for the Motorola 56300, which you can find on the Berkeley Design Technology Inc.'s Pocket Guide to Processors for DSP.
(d) You will need to look at the schedule to determine how many telephone touchtone dual-tone multiple-frequency (DTMF) samples are generated for four iterations. A DTMF signal is typically sampled at a rate of 8000 samples/s at a telephone central office.
Problem 3.2: The CGC Butterfly demo uses the native C compiler (invoked by cc) by default, which is not installed on the LRC Solaris machines. To change the choice of compiler, please hit the keyboard shortcut 'T' for edit-target. Hit OK. Change the compileCommand from "cc" to "gcc" so that the GNU C compiler will be invoked.
You can measure the runtime of the SDF Butterfly demo, choose the appropriate option in the run-control panel. It is called something like "time the run".
Problem 3.3: To determine the production and consumption of tokens on the arcs, you'll need to look at the parameter settings (via edit parameters or 'e' key) for the nodes for each input/output port.
Problem 3.4: At least one student has been able to get the dynamic linking to work from Ptolemy Classic by using the make-star command. The make-star command will try to create a shared object from the object file. The student found that adding -fPIC to the compilation step allows the "g++ -shared" cmd executed by ptolemy to work.
The other route is to perform most of the work at the command line and then use the make-star command in Ptolemy Classic. For the manual step, the GNU C++ compiler will be used:
```
sunfire2.ece 28# g++ --version
2.95.2
sunfire2.ece 29# which g++
/usr/local/bin/g++
```
The GNU C++ 2.95.2 compiler is not allowing an implicit data type on method declarations to default to int. Since I could not find the right option for the GNU C++ 2.95.2 compiler to allow this default, I've modified three of the core Ptolemy include files to explicitly declare the return type to be an int. Here's the modified command to compile SDFMyFIR.cc:
```
g++ -shared -fPIC -c -I/home/ecelrc/faculty/bevans/Ptolemy/src/kernel -I$PTOLEMY/src/domains/sdf/kernel SDFMyFIR.cc
```

Updated 04/25/04.