Java GpioPinDigitalOutput.setState方法代碼示例

import com.pi4j.io.gpio.GpioPinDigitalOutput; //導入方法依賴的package包/類
public static void main(String[] args) {

        System.out.println("<--Pi4J--> GPIO Frequency Example ... started.");

        // create gpio controller
        final GpioController gpio = GpioFactory.getInstance();

        // provision gpio pin #01 as an output pin and turn on
        final GpioPinDigitalOutput pin = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_01, PinState.LOW);

        // continuous loop
        while(true) {
            pin.setState(true);
            pin.setState(false);
        }

        // 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.GpioPinDigitalOutput; //導入方法依賴的package包/類
public static void main(String[] args) {
    
    System.out.println("<--Pi4J--> GPIO Frequency Example ... started.");
    
    // create gpio controller
    final GpioController gpio = GpioFactory.getInstance();
    
    // provision gpio pin #01 as an output pin and turn on
    final GpioPinDigitalOutput pin = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_01, PinState.LOW);

    // continuous loop
    while(true) {            
        pin.setState(true);
        pin.setState(false);
    }
    
    // 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.GpioPinDigitalOutput; //導入方法依賴的package包/類
@Override
public synchronized void switchRelay(int num, boolean on) {
  if (num < 0 || num >= mMapping.length) {
    LOG.warn("Invalid relay number: " + num);
    return;
  }

  LOG.info("Switching relay" + num + " on? " + on);
  GpioPinDigitalOutput gpio = mActivePins.get(num);
  if (gpio != null) {
    // If we already initialize the pin, simply switch the state.
    gpio.setState(on ? PinState.LOW : PinState.HIGH);
    return;
  }

  // A relay is 'ON' when its pin is set to LOW. However, there is an issue if
  // we call provisionDigitalOutputPin with state HIGH to have the pin off as
  // it will very briefly switch it to LOW. This is not acceptable, since e.g.
  // we might accidentally open up a garage door when initializing the pins.
  // This is why we don't provision the pin here until we need it.

  if (!on) {
    // If a pin has not been provisioned yet and is supposed to be switched
    // 'off', don't do anything.
    return;
  }

  // Only if a pin has not been provisioned yet and is to be switched on,
  // provision it to the relay state 'ON' which is 'LOW'.
  final GpioPinDigitalOutput pin = mGpioController.provisionDigitalOutputPin(
      Pins.GPIO_PIN[mMapping[num]], PinState.LOW);

  // Important: When the program is exited the pin needs to go into 'HIGH'
  // state so that the relay stays off. We don't want garage doors to open
  // when the app exits.
  pin.setShutdownOptions(true, PinState.HIGH, PinPullResistance.OFF);
  mActivePins.put(num, pin);
}
 

import com.pi4j.io.gpio.GpioPinDigitalOutput; //導入方法依賴的package包/類
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.GpioPinDigitalOutput; //導入方法依賴的package包/類
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                
}
 

import com.pi4j.io.gpio.GpioPinDigitalOutput; //導入方法依賴的package包/類
public static void main(String[] args) throws Exception {
	printCommands();

	GpioFactory.setDefaultProvider(new RaspiGpioProvider(RaspiPinNumberingScheme.BROADCOM_PIN_NUMBERING));
	
	GpioPinDigitalOutput led = GpioFactory.getInstance().provisionDigitalOutputPin(RaspiPin.GPIO_17);
	led.setState(PinState.HIGH);		

	// Initialize SPI and I2C bus:
	I2CBus iic1 = I2CFactory.getInstance(I2CBus.BUS_1);

	SpiDevice spi0 = SpiFactory.getInstance(
			SpiChannel.CS0,
			SpiDevice.DEFAULT_SPI_SPEED, // default spi speed 1 MHz
               SpiDevice.DEFAULT_SPI_MODE);
	

	rover = new Rover();

	// create the concrete instance of the compass chip:
	compass = new HMC5883L(iic1.getDevice(0x1e), HMC5883LConfig.Default);
	
	adc = new Mcp3008(spi0);
	ir = new Sharp0A41SK(adc, (short) 0);

	roverTest();
	
	led.setState(PinState.LOW);	
	rover.end();
	iic1.close();
}