CLASSES Linker Directive

Abbreviation

Arguments

CLASSES (class (range〚, ...〛) 〚, ...〛)

Default

None.

µVision

Options — LA Locate — User Classes.

Description

The CLASSES directive allows you to specify an address range (range) for a class (classname). This directive is used to define the memory layout of your application program or target hardware.

The LA Linker uses the following default class settings if no explicit class ranges are specified:

Class	Address Range
CODE	0x00000000-0xFFFFFFFF
CONST	0x00000000-0xFFFFFFFF
DATA	0x00000000-0xFFFFFFFF
ERAM	0x00000000-0xFFFFFFFF

Note

The address ranges used are listed in the linker MAP file in the Memory Classes section. You should check this section of the MAP file to verify that the linker assumptions about the memory in your hardware matches your physical system.

Specifying the memory range for a class...

The CLASSES directive is typically specified as follows to define an address range for a memory class:

CLASSES (class (range〚, ...〛) 〚, ...〛)

Where

class	is the name of the class.
range	is the address range to assign to the class. All segments within a class are located and must fit within this range.

Note

You may specify multiple ranges for a memory class.

See Also

SEGMENTS

Example

The following example defines the memory classes for an ARM device:

LA MYFILE.OBJ &
     CLASSES (CODE (0 - 0x7FFFF), CONST (0x1000-0x7FFFF),
              DATA (0x40000000-0x40003FFF, 0x80000000,0x801FFFFF))

The following example defines a user-defined memory class XDATA_FLASH:

LA MYFILE.OBJ &
     CLASSES (CODE_FLASH (0x80000-0x8FFFF))