This application will monitor the digital inputs. The corresponding output is set when an input pulsed. That output remains active until a different input is pulsed. This application effectively latches the output to represent the last input that transitioned from low to high.
package com.integ.latchrelays;
import com.integpg.system.IoEvent;
import com.integpg.system.Iolog;
import com.integpg.system.JANOS;
import java.io.IOException;
import java.util.Date;
/**
* This application will monitor the digital inputs. The corresponding output is set
* when an input pulsed. That output remains active until a different input is pulsed.
* This application effectively latches the output to represent the last input that
* transitioned from low to high.
*/
public class LatchRelaysMain {
public static void main(String[] args) throws InterruptedException, IOException {
// create an Iolog instance and a timestamp representing the last time an
// event occurred. we will start with a value of zero indicating only new events
Iolog iolog = new Iolog();
long timestamp = 0;
// loop forever
while (true) {
// refresh the oilog with the timestamp of the last input event
iolog.refresh(timestamp);
IoEvent[] inputEvents = iolog.getInputEvents();
// only process if there are events
if (0 != inputEvents.length) {
System.out.println("inputEvents.length = " + inputEvents.length);
// loop through the input events
for (int i = 0; i < inputEvents.length; i++) {
IoEvent inputEvent = inputEvents[i];
timestamp = inputEvent.timestamp;
System.out.println("timestamp = " + new Date(timestamp));
int highTransitions = inputEvent.mask & inputEvent.states;
boolean isTransitionHigh = (0 != highTransitions);
System.out.println("isTransitionHigh = " + isTransitionHigh);
// if the event was a transition high then set the outputs to
// represent the state of the inputs that transitioned from
// low to high. we will use all outputs here
if (isTransitionHigh) {
JANOS.setOutputStates(highTransitions, 0xff);
// we are only looking to process the most recent inpput
// transition from low to high. so once we find one we
// can abort the loop.
break;
}
}
}
// sleep for a little bit of time to not monopolize the CPU
Thread.sleep(50);
}
}
}
@integpg