@Override
public void addListener(GpioPinListener[] listeners, GpioPinInput... pin) {
delegate.addListener(listeners, pin);
}
public static void main(String args[]) throws InterruptedException, IOException {
System.out.println("<--Pi4J--> PiFace (MCP23017) GPIO Example ... started.");
// create gpio controller
final GpioController gpio = GpioFactory.getInstance();
// create custom PiFace GPIO provider
final PiFaceGpioProvider gpioProvider =
new PiFaceGpioProvider(PiFaceGpioProvider.DEFAULT_ADDRESS, SpiChannel.CS0);
// provision gpio input pins from PiFaceGpioProvider
GpioPinDigitalInput myInputs[] = {
gpio.provisionDigitalInputPin(gpioProvider, PiFacePin.INPUT_00),
gpio.provisionDigitalInputPin(gpioProvider, PiFacePin.INPUT_01),
gpio.provisionDigitalInputPin(gpioProvider, PiFacePin.INPUT_02),
gpio.provisionDigitalInputPin(gpioProvider, PiFacePin.INPUT_03),
gpio.provisionDigitalInputPin(gpioProvider, PiFacePin.INPUT_04),
gpio.provisionDigitalInputPin(gpioProvider, PiFacePin.INPUT_05),
gpio.provisionDigitalInputPin(gpioProvider, PiFacePin.INPUT_06),
gpio.provisionDigitalInputPin(gpioProvider, PiFacePin.INPUT_07)
};
// create and register gpio pin listener
gpio.addListener(
new GpioPinListenerDigital() {
@Override
public void handleGpioPinDigitalStateChangeEvent(GpioPinDigitalStateChangeEvent event) {
// display pin state on console
System.out.println(
" --> GPIO PIN STATE CHANGE: " + event.getPin() + " = " + event.getState());
}
},
myInputs);
// provision gpio output pins and make sure they are all LOW at startup
GpioPinDigitalOutput myOutputs[] = {
gpio.provisionDigitalOutputPin(gpioProvider, PiFacePin.OUTPUT_00),
gpio.provisionDigitalOutputPin(gpioProvider, PiFacePin.OUTPUT_01),
gpio.provisionDigitalOutputPin(gpioProvider, PiFacePin.OUTPUT_02),
gpio.provisionDigitalOutputPin(gpioProvider, PiFacePin.OUTPUT_03),
gpio.provisionDigitalOutputPin(gpioProvider, PiFacePin.OUTPUT_04),
gpio.provisionDigitalOutputPin(gpioProvider, PiFacePin.OUTPUT_05),
gpio.provisionDigitalOutputPin(gpioProvider, PiFacePin.OUTPUT_06),
gpio.provisionDigitalOutputPin(gpioProvider, PiFacePin.OUTPUT_07),
};
// keep program running for 20 seconds
for (int count = 0; count < 10; count++) {
gpio.setState(true, myOutputs);
Thread.sleep(1000);
gpio.setState(false, myOutputs);
Thread.sleep(1000);
}
// stop all GPIO activity/threads by shutting down the GPIO controller
// (this method will forcefully shutdown all GPIO monitoring threads and scheduled tasks)
gpio.shutdown();
System.out.println("Exiting PiFaceGpioExample");
}