com.sun.spot.dmamemory
Class DMAMemoryManager

java.lang.Object
  com.sun.spot.dmamemory.DMAMemoryManager

All Implemented Interfaces:

IDMAMemoryManager

public class DMAMemoryManager
extends Object
implements IDMAMemoryManager

Manages a chunk of uncached memory to be used for DMA buffers - see IDMAMemoryManager

Constructor Summary

DMAMemoryManager()
For use by the SPOT library only - to get a handle to a DMA Memory Manager use Spot.getInstance().getDMAMemoryManager()

Method Summary

Hashtable	getAllocationDetails() Get information about current memory allocations.
int	getBuffer(int size, String comment) Try to obtain memory for a DMA buffer.
int	getMaxAvailableBufferSize() Find out the size of the biggest available DMA memory buffer
void	releaseBuffer(int memAddr) Release a previously allocated buffer

Methods inherited from class java.lang.Object

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

Constructor Detail

DMAMemoryManager

public DMAMemoryManager()

For use by the SPOT library only - to get a handle to a DMA Memory Manager use Spot.getInstance().getDMAMemoryManager()

Method Detail

getBuffer

public int getBuffer(int size,
                     String comment)
              throws NotEnoughDMAMemoryException

Description copied from interface: IDMAMemoryManager

Try to obtain memory for a DMA buffer.

Specified by:

getBuffer in interface IDMAMemoryManager

Parameters:

size - The size of the required buffer

comment - A string that describes the usage (so we can tell who's using what)

Returns:

The address of the allocated buffer

Throws:

NotEnoughDMAMemoryException

getMaxAvailableBufferSize

public int getMaxAvailableBufferSize()

Description copied from interface: IDMAMemoryManager

Find out the size of the biggest available DMA memory buffer

Specified by:

getMaxAvailableBufferSize in interface IDMAMemoryManager

Returns:

The size of the biggest buffer that is available

releaseBuffer

public void releaseBuffer(int memAddr)

Description copied from interface: IDMAMemoryManager

Release a previously allocated buffer

Specified by:

releaseBuffer in interface IDMAMemoryManager

Parameters:

memAddr - The address of the buffer being released

getAllocationDetails

public Hashtable getAllocationDetails()

Description copied from interface: IDMAMemoryManager

Get information about current memory allocations. Each entry in the table represents an allocation. The key is the comment string provided when the buffer was allocated; the value is the size of the buffer.

Specified by:

getAllocationDetails in interface IDMAMemoryManager

Returns:

The table of allocations