@Override
public void setMode(Pin pin, PinMode mode) {
// validate
if (!pin.getSupportedPinModes().contains(mode)) {
throw new InvalidPinModeException(
pin,
"Invalid pin mode ["
+ mode.getName()
+ "]; pin ["
+ pin.getName()
+ "] does not support this mode.");
}
// validate
if (!pin.getSupportedPinModes().contains(mode)) {
throw new UnsupportedPinModeException(pin, mode);
}
// determine A or B port based on pin address
try {
if (pin.getAddress() < GPIO_B_OFFSET) {
setModeA(pin, mode);
} else {
setModeB(pin, mode);
}
} catch (IOException ex) {
throw new RuntimeException(ex);
}
// cache mode
getPinCache(pin).setMode(mode);
// if any pins are configured as input pins, then we need to start the interrupt monitoring
// thread
if (currentDirectionA > 0 || currentDirectionB > 0) {
// if the monitor has not been started, then start it now
if (monitor == null) {
// start monitoring thread
monitor = new GpioStateMonitor(this);
monitor.start();
}
} else {
// shutdown and destroy monitoring thread since there are no input pins configured
if (monitor != null) {
monitor.shutdown();
monitor = null;
}
}
}
@Override
public void shutdown() {
// prevent reentrant invocation
if (isShutdown()) return;
// perform shutdown login in base
super.shutdown();
// if a monitor is running, then shut it down now
if (monitor != null) {
// shutdown monitoring thread
monitor.shutdown();
monitor = null;
}
}