Chapter 38.

TIC54X Dependent Features

38.1. Options

The TMS320C54x version of

as

has a few machine dependent options.

You can use the

 mfar mode

option to enable extended addressing mode. All addresses will be

assumed to be

16 bits, and the appropriate relocation types will be used. This option is equivalent

to using the

.far_mode

directive in the assembly code. If you do not use the

 mfar mode

option,

all references will be assumed to be 16 bits. This option may be abbreviated to

 mf

.

You can use the

 mcpu

option to specify a particular CPU. This option is equivalent to using the

.version

directive in the assembly code. For recognized CPU codes, see Section 38.9 Directives.

The default CPU version is

542

.

You can use the

 merrors to file

option to redirect error output to a file (this provided for those

deficient environments which don't provide adequate output redirection). This option may be abbre 

viated to

 me

.

38.2. Blocking

A blocked section or memory block is guaranteed not to cross the blocking boundary (usually a page,

or 128 words) if it is smaller than the blocking size, or to start on a page boundary if it is larger than

the blocking size.

38.3. Environment Settings

C54XDSP_DIR

and

A_DIR

are semicolon separated paths which are added to the list of directories

normally searched for source and include files.

C54XDSP_DIR

will override

A_DIR

.

38.4. Constants Syntax

The TIC54X version of

as

allows the following additional constant formats, using a suffix to indicate

the radix:

Binary

000000B, 011000b

Octal

10Q, 224q

Hexadecimal

45h, 0FH

38.5. String Substitution

A subset of allowable symbols (which we'll call subsyms) may be assigned arbitrary string values.

This is roughly equivalent to C preprocessor #define macros. When

as

encounters one of these sym 

bols, the symbol is replaced in the input stream by its string value. Subsym names must begin with a

letter.