Package com.dalsemi.onewire.container

Interface OneWireSensor

All Known Subinterfaces:
ADContainer, ClockContainer, HumidityContainer, MissionContainer, PotentiometerContainer, SwitchContainer, TemperatureContainer
All Known Implementing Classes:
OneWireContainer04, OneWireContainer05, OneWireContainer10, OneWireContainer12, OneWireContainer1C, OneWireContainer1F, OneWireContainer20, OneWireContainer21, OneWireContainer22, OneWireContainer24, OneWireContainer26, OneWireContainer27, OneWireContainer28, OneWireContainer29, OneWireContainer2C, OneWireContainer30, OneWireContainer3A, OneWireContainer41, OneWireContainer42
public interface OneWireSensor

1-Wire sensor interface class for basic sensor operations.

Typically the operations of 1-Wire Sensors are memory mapped so writing to a particular location causes the state to change. To accommodate this type of architecture and reduce the number of 1- Wire operations that need to take place, a 'read-modify-write' technique is used. Each Sensor interface is derived from this super-interface that contain just two methods: readDevice, writeDevice. The read returns a byte array and the write takes a byte array. The byte array is the state of the device. The interfaces that extend this interface have 'get' and 'set' methods that manipulate the byte array. So a OneWireSensor operation is:

  1. state = readDevice()
  2. 'get' and 'set' methods on state
  3. writeDevice(state)

Usage

Example 1

Read the sensed level of a SwitchContainer instance 'sw': 
  
  byte[] state = sw.readDevice();
  if (sw.hasLevelSensing())
  {
     for (int ch = 0; ch < sw.getNumberChannels(state); ch++)
     {
        System.out.print("Level for channel " + ch + " is : ");
        if (sw.getLevel(ch, state))
           System.out.println("HIGH");
        else
           System.out.println("HIGH");
     }
  }
  else
      System.out.println("This SwitchContainer can not sense level");

Example 2

Set the clock of a ClockContainer instance 'cl': 
  
  byte[] state = cl.readDevice();
  cl.setClock((new Date().getTime()), state);
  cl.setClockRunEnable(true, state);
  cl.writeDevice(state);
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    byte[]
    readDevice()
    Retrieves the 1-Wire device sensor state.
    void
    writeDevice(byte[] state)
    Writes the 1-Wire device sensor state that have been changed by 'set' methods.

  • Method Details

    • readDevice

      byte[] readDevice() throws OneWireIOException, OneWireException
      Retrieves the 1-Wire device sensor state. This state is returned as a byte array. Pass this byte array to the 'get' and 'set' methods. If the device state needs to be changed then call the 'writeDevice' to finalize the changes.
      Returns:
      1-Wire device sensor state
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter

    • writeDevice

      void writeDevice(byte[] state) throws OneWireIOException, OneWireException
      Writes the 1-Wire device sensor state that have been changed by 'set' methods. Only the state registers that changed are updated. This is done by referencing a field information appended to the state data.
      Parameters:
      state - 1-Wire device sensor state
      Throws:
      OneWireIOException - on a 1-Wire communication error such as reading an incorrect CRC from a 1-Wire device. This could be caused by a physical interruption in the 1-Wire Network due to shorts or a newly arriving 1-Wire device issuing a 'presence pulse'.
      OneWireException - on a communication or setup error with the 1-Wire adapter