ev3dev.utils.io

Class NativeDevice

java.lang.Object

ev3dev.utils.io.NativeFile

ev3dev.utils.io.NativeDevice

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

NativeFramebuffer, NativeTTY

public class NativeDevice
extends NativeFile

This class provides access from Java to Linux character devices. It is intended to allow access from Java to the Lego kernel modules which provide access to EV3 hardware features.

Field Summary

Fields inherited from class ev3dev.utils.io.NativeFile

fd

Constructor Summary

Constructors

Constructor and Description
NativeDevice(java.lang.String dname) Create a native device to provide access to the specified character device
NativeDevice(java.lang.String dname, ILibc libc) Create a native device to provide access to the specified character device
NativeDevice(java.lang.String dname, int flags) Create a native device to provide access to the specified character device
NativeDevice(java.lang.String dname, int flags, ILibc libc) Create a native device to provide access to the specified character device

Method Summary

Modifier and Type	Method and Description
Pointer	mmap(long len) Map a portion of the device into memory and return a pointer which can be used to read/write the device.

Methods inherited from class ev3dev.utils.io.NativeFile

close, ioctl, ioctl, isOpen, mmap, msync, munmap, open, open, read, read, write, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NativeDevice

public NativeDevice(java.lang.String dname)
             throws LastErrorException

Create a native device to provide access to the specified character device

Parameters:

dname - name of the character device

Throws:

LastErrorException

NativeDevice

public NativeDevice(java.lang.String dname,
                    int flags)
             throws LastErrorException

Create a native device to provide access to the specified character device

Parameters:

flags - opening flags of the device - read, write or both

dname - name of the character device

Throws:

LastErrorException

NativeDevice

public NativeDevice(java.lang.String dname,
                    ILibc libc)
             throws LastErrorException

Create a native device to provide access to the specified character device

Parameters:

dname - name of the character device

libc - standard C library interface to be used.

Throws:

LastErrorException

NativeDevice

public NativeDevice(java.lang.String dname,
                    int flags,
                    ILibc libc)
             throws LastErrorException

Create a native device to provide access to the specified character device

Parameters:

flags - opening flags of the device - read, write or both

dname - name of the character device

libc - standard C library interface to be used.

Throws:

LastErrorException

Method Detail

mmap

public Pointer mmap(long len)
             throws LastErrorException

Map a portion of the device into memory and return a pointer which can be used to read/write the device.

Parameters:

len - number of bytes to map

Returns:

a pointer that can be used to access the device memory

Throws:

LastErrorException