io.silverspoon.bulldog.beagleboneblack.jni.NativeAdc Maven / Gradle / Ivy

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package io.silverspoon.bulldog.beagleboneblack.jni;

import java.nio.IntBuffer;

public class NativeAdc {

   public static final int BBBIO_ADC_STEP_MODE_SW_ONE_SHOOT = 0x0;
   public static final int BBBIO_ADC_STEP_MODE_SW_CONTINUOUS = 0x1;
   public static final int BBBIO_ADC_STEP_MODE_HW_ONE_SHOOT = 0x2;
   public static final int BBBIO_ADC_STEP_MODE_HW_CONTINUOUS = 0x3;

   public static final int BBBIO_ADC_STEP_AVG_1 = 0x0;
   public static final int BBBIO_ADC_STEP_AVG_2 = 0x1;
   public static final int BBBIO_ADC_STEP_AVG_4 = 0x2;
   public static final int BBBIO_ADC_STEP_AVG_8 = 0x3;
   public static final int BBBIO_ADC_STEP_AVG_16 = 0x4;

   public static final int BBBIO_ADC_WORK_MODE_BUSY_POLLING = 0x1;
   public static final int BBBIO_ADC_WORK_MODE_TIMER_INT = 0x2;

   public static final float SYSCLOCK_HZ = 24000000 / 14;

   public static native int setup();

   public static native void teardown();

   public static native void fetchSamples(int amountSamples);

   public static native void configureModule(int workType, int clockDivisor);

   public static native void configureChannel(int channel, int mode, int startDelay, int sampleDelay, int sampleSize, IntBuffer buffer, int bufferSize);

   public static native void enableChannel(int channel);

   public static native void disableChannel(int channel);

   private static boolean isInitialized = false;

   static {
      NativeGpio.initialize();
      initialize();
   }

   public static void initialize() {
      if (isInitialized) {
         return;
      }
      setup();
      isInitialized = true;
      Runtime.getRuntime().addShutdownHook(new Thread() {
         @Override
         public void run() {
            deinitialize();
         }
      });
   }

   public static void deinitialize() {
      if (isInitialized) {
         teardown();
         isInitialized = false;
      }
   }

   public static int calculateNearestDivisorForFrequency(float desiredFrequency) {
      float divisor = SYSCLOCK_HZ / desiredFrequency;
      return Math.round(divisor);
   }

}