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• MCP4902.java

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io.silverspoon.bulldog.devices.dac.MCP4902 Maven / Gradle / Ivy

package io.silverspoon.bulldog.devices.dac;

import java.io.IOException;

import io.silverspoon.bulldog.core.gpio.DigitalOutput;
import io.silverspoon.bulldog.core.io.bus.spi.SpiBus;
import io.silverspoon.bulldog.core.io.bus.spi.SpiConnection;
import io.silverspoon.bulldog.core.io.bus.spi.SpiDevice;
import io.silverspoon.bulldog.core.util.BitMagic;

public class MCP4902 extends SpiDevice {

   public MCP4902(SpiBus bus, DigitalOutput chipSelect) {
      this(bus.createSpiConnection(chipSelect));
   }

   public MCP4902(SpiBus bus, int addressOfChipselect) {
      this(bus.createSpiConnection(addressOfChipselect));
   }

   public MCP4902(SpiConnection connection) {
      super(connection);
   }

   public void setVoltageOnDacA(double voltage, boolean outputGain) throws IOException {
      short command = 0x00;
      command = BitMagic.setBit(command, 15, 0);
      setVoltageOnDac(voltage, outputGain, false, command);
   }

   public void setVoltageOnDacB(double voltage, boolean outputGain) throws IOException {
      short command = 0x00;
      command = BitMagic.setBit(command, 15, 1);
      setVoltageOnDac(voltage, outputGain, false, command);
   }

   private void setVoltageOnDac(double voltage, boolean outputGain, boolean shutdown, short command)
         throws IOException {
      command = BitMagic.setBit(command, 14, 0);
      if (outputGain) {
         command = BitMagic.setBit(command, 13, 0);
      }

      if (shutdown) {
         command = BitMagic.setBit(command, 12, 0);
      } else {
         command = BitMagic.setBit(command, 12, 1);
      }
      command |= ((0xFFFFFFFF & ((int) (255 * voltage))) << 4);
      byte[] bytes = new byte[2];
      bytes[0] = (byte) ((0xFF00 & command) >> 8);
      bytes[1] = (byte) ((0X00FF & command));
      getBusConnection().writeBytes(bytes);
   }

   public void shutdownDacA() throws IOException {
      short command = 0x00;
      command = BitMagic.setBit(command, 15, 0);
      setVoltageOnDac(0.0, false, true, command);
   }

   public void shutdownDacB() throws IOException {
      short command = 0x00;
      command = BitMagic.setBit(command, 15, 1);
      setVoltageOnDac(0.0, false, true, command);
   }
}