Instrument Control Toolbox

memunmap

Unmap memory for low-level memory read and write operations

Syntax

• memunmap(obj)
  

Arguments

obj	A VISA-VXI or VISA-GPIB-VXI object.

Description

memunmap(obj) unmaps memory space previously mapped by the memmap function.

Remarks

When the memory space is unmapped, the MappedMemorySize property is set to 0 and the MappedMemoryBase property is set to 0H.

Example

Create the VISA-VXI object vv associated with a VXI chassis with index 0, and an Agilent E1432A digitizer with logical address 130.

• vv = visa('agilent','VXI0::130::INSTR');
  fopen(vv)
  

Map 16 bytes in the A16 address space.

• memmap(vv,'A16',0,16)
  

Read the first and second instrument registers.

• reg1 = mempeek(vv,0,'uint16');
  reg2 = mempeek(vv,2,'uint16');
  

Use memunmap to unmap the memory, and disconnect vv from the instrument.

• memunmap(vv)
  fclose(vv)
  

See Also

Functions

memmap, mempeek, mempoke

Properties

MappedMemoryBase, MappedMemorySize

memread

memwrite