copter.GpioControl.java Source code

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Here is the source code for copter.GpioControl.java

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/*
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 */
package copter;

import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalOutput;
import com.pi4j.io.gpio.RaspiPin;
import java.util.HashMap;
import java.util.Map;
import org.json.simple.JSONObject;

/**
 *
 * @author default
 */
public class GpioControl {

    private static GpioControl instance = null;
    private static Logger logger = null;
    private final GpioController gpio;
    private final Map<Integer, GpioPinDigitalOutput> pins;

    private GpioControl() {
        logger = Logger.getInstance();
        gpio = GpioFactory.getInstance();
        pins = new HashMap<>();
    }

    private GpioPinDigitalOutput getOutputPin(Integer pinNumber) {
        if (pins.containsKey(pinNumber)) {
            return pins.get(pinNumber);
        }
        switch (pinNumber) {
        case 0:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_00));
            break;
        case 1:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_01));
            break;
        case 2:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_02));
            break;
        case 3:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_03));
            break;
        case 4:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_04));
            break;
        case 5:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_05));
            break;
        case 6:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_06));
            break;
        case 7:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_07));
            break;
        case 8:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_08));
            break;
        case 9:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_09));
            break;
        case 10:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_10));
            break;
        case 11:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_11));
            break;
        case 12:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_12));
            break;
        case 13:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_13));
            break;
        case 14:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_14));
            break;
        case 15:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_15));
            break;
        case 16:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_16));
            break;
        case 17:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_17));
            break;
        case 18:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_18));
            break;
        case 19:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_19));
            break;
        case 20:
            pins.put(pinNumber, gpio.provisionDigitalOutputPin(RaspiPin.GPIO_20));
            break;
        }
        return pins.get(pinNumber);
    }

    public static GpioControl getInstance() {
        if (instance == null) {
            instance = new GpioControl();
        }
        return instance;
    }

    public String setPinState(Integer pinNumber, boolean state) {
        if (state) {
            getOutputPin(pinNumber).high();
            return "Set GPIO pin #" + pinNumber.toString() + " state to HIGH";
        } else {
            getOutputPin(pinNumber).low();
            return "Set GPIO pin #" + pinNumber.toString() + " state to LOW";
        }
    }

    public String togglePinState(Integer pinNumber) {
        getOutputPin(pinNumber).toggle();
        return "Toggle GPIO pin #" + pinNumber.toString() + " state";
    }

    public String pulsePin(Integer pinNumber, Integer milliseconds) {
        getOutputPin(pinNumber).pulse(milliseconds);
        return "Pulse to GPIO pin #" + pinNumber.toString() + " duration: " + milliseconds.toString();
    }

    public String doAction(JSONObject jsonParam) {
        if (!jsonParam.containsKey("action")) {
            return "Missing 'action' param!";
        }
        String action = (String) jsonParam.get("action");
        int pinNumber;
        int pinState;
        switch (action) {
        case Constants.GPIO_PULSE_ACTION:
            pinNumber = (int) (long) jsonParam.get("pin_number");
            int durationMilliseconds = (int) (long) jsonParam.get("duration_milliseconds");
            return this.pulsePin(pinNumber, durationMilliseconds);
        case Constants.GPIO_SET_PIN_STATE_ACTION:
            pinNumber = (int) (long) jsonParam.get("pin_number");
            pinState = (int) (long) jsonParam.get("pin_state");
            return this.setPinState(pinNumber, pinState != 0);
        case Constants.GPIO_TOGGLE_PIN_STATE_ACTION:
            pinNumber = (int) (long) jsonParam.get("pin_number");
            return this.togglePinState(pinNumber);
        }
        return "Unknown 'action' param: " + action;
    }

}