/*
This file is part of JOP, the Java Optimized Processor
see <http://www.jopdesign.com/>
Copyright (C) 2009, Martin Schoeberl (martin@jopdesign.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package sp;
/**
* A single path programming example on JOP. It samples an input value and
* performs sliding averaging.
*
* @author Raimund Kirner (raimund@vmars.tuwien.ac.at)
*
*/
public class STSampler extends SimpleHBTask {
int nWCETread = 300;
int nWCETexecute = 300;
int nWCETwrite = 300;
int buf[];
int inval;
int nDat = 0;
SharedIMem ird;
SharedIMem iwrt;
public STSampler(SharedIMem ird, SharedIMem iwrt) {
this.ird = ird;
this.iwrt = iwrt;
buf = new int[2];
}
/**
* Perform read access to shared data.
*/
public void read() {
inval = ird.get();
}
/**
* Execute task logic. Read and write access to shared data is forbidden.
* MS: a running average uses a buffer and not the last average value. Gives
* also different r/x/w cycles ;-)
*/
public void execute() {
buf[1] = buf[0];
buf[0] = inval;
nDat = (buf[1] + buf[0]) >> 1;
this.setAlive();
}
/**
* Write results to the shared memory.
*/
public void write() {
iwrt.set(nDat);
}
/**
* Some wrapper methods to enable WCET analysis including cache loading.
*/
public void readWrapperWCET() {
read();
}
public void executeWrapperWCET() {
execute();
}
public void writeWrapperWCET() {
write();
}
}