Java GpioPinDigitalInput.getState方法代码示例

import com.pi4j.io.gpio.GpioPinDigitalInput; //导入方法依赖的package包/类
public static void main(String[] args) 
           throws IOException, InterruptedException {
       
       // Create a GPIO controller instance
final GpioController gpio = GpioFactory.getInstance();	
       
       // Pi4J 22 = 6
       final GpioPinDigitalInput inputPin = gpio.provisionDigitalInputPin(RaspiPin.GPIO_22, PinPullResistance.PULL_DOWN);
       PinState inputState = inputPin.getState();
       /*
       while(System.in.available() == 0) {
           System.out.println(inputPin.isHigh());
           inputState = inputPin.getState();
           System.out.println(inputState.toString());
           Thread.sleep(1000);
       }*/
       
       System.out.println("Pulled down pin 22/6");

       int samples = 100000;
       
       // Take a bunch of samples and report
       while(System.in.available() == 0) {
           double sample = 0;
           for(int k = 0; k < samples ; k++) {
               if(inputPin.isHigh()) {
                   sample++;
               }
           }
           
           System.out.println(sample/samples);
       }
       
       System.out.println("Done");
   }
 

import com.pi4j.io.gpio.GpioPinDigitalInput; //导入方法依赖的package包/类
public static void main(String[] args) throws InterruptedException {

        // START SNIPPET: usage-create-controller-snippet
        // create gpio controller instance
        final GpioController gpio = GpioFactory.getInstance();
        // END SNIPPET: usage-create-controller-snippet

        // START SNIPPET: usage-provision-input-pin-snippet
        // provision gpio pin #02 as an input pin with its internal pull down resistor enabled
        // (configure pin edge to both rising and falling to get notified for HIGH and LOW state
        // changes)
        GpioPinDigitalInput myButton = gpio.provisionDigitalInputPin(RaspiPin.GPIO_02,             // PIN NUMBER
                                                                     "MyButton",                   // PIN FRIENDLY NAME (optional)
                                                                     PinPullResistance.PULL_DOWN); // PIN RESISTANCE (optional)

        // END SNIPPET: usage-provision-input-pin-snippet
        // START SNIPPET: usage-provision-output-pin-snippet
        // provision gpio pins #04 as an output pin and make sure is is set to LOW at startup
        GpioPinDigitalOutput myLed = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_04,   // PIN NUMBER
                                                                   "My LED",           // PIN FRIENDLY NAME (optional)
                                                                   PinState.LOW);      // PIN STARTUP STATE (optional)
        // END SNIPPET: usage-provision-output-pin-snippet

        // START SNIPPET: usage-shutdown-pin-snippet
        // configure the pin shutdown behavior; these settings will be
        // automatically applied to the pin when the application is terminated
        // ensure that the LED is turned OFF when the application is shutdown
        myLed.setShutdownOptions(true, PinState.LOW, PinPullResistance.OFF);
        // END SNIPPET: usage-shutdown-pin-snippet

        // START SNIPPET: usage-control-pin-snippet
        // explicitly set a state on the pin object
        myLed.setState(PinState.HIGH);

        // use convenience wrapper method to set state on the pin object
        myLed.low();
        myLed.high();

        // use toggle method to apply inverse state on the pin object
        myLed.toggle();

        // use pulse method to set the pin to the HIGH state for
        // an explicit length of time in milliseconds
        myLed.pulse(1000);
        // END SNIPPET: usage-control-pin-snippet

        // START SNIPPET: usage-read-pin-snippet
        // get explicit state enumeration for the GPIO pin associated with the button
        PinState myButtonState = myButton.getState();

        // use convenience wrapper method to interrogate the button state
        boolean buttonPressed = myButton.isHigh();
        // END SNIPPET: usage-read-pin-snippet

        // START SNIPPET: usage-register-listener-snippet
        // create and register gpio pin listener
        myButton.addListener(new GpioUsageExampleListener());
        // END SNIPPET: usage-register-listener-snippet

        // START SNIPPET: usage-trigger-snippet
        // create a gpio synchronization trigger on the input pin
        // when the input state changes, also set LED controlling gpio pin to same state
        myButton.addTrigger(new GpioSyncStateTrigger(myLed));
        // END SNIPPET: usage-trigger-snippet

        // keep program running until user aborts (CTRL-C)
        while (true) {
            Thread.sleep(500);
        }

        // 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();   <--- implement this method call if you wish to terminate the Pi4J GPIO controller
    }
 

import com.pi4j.io.gpio.GpioPinDigitalInput; //导入方法依赖的package包/类
public static void main(String[] args) throws InterruptedException {
    
    // START SNIPPET: usage-create-controller-snippet
    // create gpio controller instance
    final GpioController gpio = GpioFactory.getInstance();
    // END SNIPPET: usage-create-controller-snippet

    // START SNIPPET: usage-provision-input-pin-snippet
    // provision gpio pin #02 as an input pin with its internal pull down resistor enabled
    // (configure pin edge to both rising and falling to get notified for HIGH and LOW state
    // changes)
    GpioPinDigitalInput myButton = gpio.provisionDigitalInputPin(RaspiPin.GPIO_02,             // PIN NUMBER
                                                                 "MyButton",                   // PIN FRIENDLY NAME (optional)
                                                                 PinPullResistance.PULL_DOWN); // PIN RESISTANCE (optional)

    // END SNIPPET: usage-provision-input-pin-snippet
    // START SNIPPET: usage-provision-output-pin-snippet
    // provision gpio pins #04 as an output pin and make sure is is set to LOW at startup
    GpioPinDigitalOutput myLed = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_04,   // PIN NUMBER
                                                               "My LED",           // PIN FRIENDLY NAME (optional)
                                                               PinState.LOW);      // PIN STARTUP STATE (optional)
    // END SNIPPET: usage-provision-output-pin-snippet

    // START SNIPPET: usage-shutdown-pin-snippet
    // configure the pin shutdown behavior; these settings will be 
    // automatically applied to the pin when the application is terminated
    // ensure that the LED is turned OFF when the application is shutdown
    myLed.setShutdownOptions(true, PinState.LOW, PinPullResistance.OFF);
    // END SNIPPET: usage-shutdown-pin-snippet
    
    // START SNIPPET: usage-control-pin-snippet
    // explicitly set a state on the pin object
    myLed.setState(PinState.HIGH);

    // use convenience wrapper method to set state on the pin object
    myLed.low();
    myLed.high();

    // use toggle method to apply inverse state on the pin object
    myLed.toggle();

    // use pulse method to set the pin to the HIGH state for
    // an explicit length of time in milliseconds
    myLed.pulse(1000);
    // END SNIPPET: usage-control-pin-snippet

    // START SNIPPET: usage-read-pin-snippet
    // get explicit state enumeration for the GPIO pin associated with the button
    PinState myButtonState = myButton.getState();

    // use convenience wrapper method to interrogate the button state
    boolean buttonPressed = myButton.isHigh();
    // END SNIPPET: usage-read-pin-snippet

    // START SNIPPET: usage-register-listener-snippet
    // create and register gpio pin listener
    myButton.addListener(new GpioUsageExampleListener());
    // END SNIPPET: usage-register-listener-snippet

    // START SNIPPET: usage-trigger-snippet
    // create a gpio synchronization trigger on the input pin
    // when the input state changes, also set LED controlling gpio pin to same state
    myButton.addTrigger(new GpioSyncStateTrigger(myLed));
    // END SNIPPET: usage-trigger-snippet

    // keep program running until user aborts (CTRL-C)
    for (;;) {
        Thread.sleep(500);
    }
    
    // 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();   <--- implement this method call if you wish to terminate the Pi4J GPIO controller                
}