MATLAB SIMULINK FIXED POINT 6 Instrukcja Użytkownika Pobierz pdf (Strona 8)

▲

■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■

TargetLink Data Types Application Note September 2004

■■■■■■■■■■■■

■

▼

■■■■■■■■■■■■■■■▼

In Simulink, both Constant block outputs and gains can have scaling

parameters. In TargetLink, they are scaled only if the associated

variable class (

output.class

gain.class

property) is not set to

default

. “

default

” means that in generated production code, the

variable (gain or

const

) will not be represented by a variable but

merged into operations.

If a Simulink Const or Gain is detected to be scaled, the Conversion

Tool selects a suitable variable class and writes it to the block. For this

purpose, the first dSPACE Data Dictionary variable class object which

complies with the following requirements is selected:

■ The property

Const

■ The property

Scope

Global

■ The property

Macro

off

■ The property

Storage

default

■ The property

Info

none

■ The property

Optimization

movable

erasable

Additionally, a message such as the following is output:

To enable setting of scaling parameters, the gain.class

property was set to Const.

Reconversion to Simulink

Simulink fixed-point settings which applied before a subsystem was

converted to TargetLink ought to be restored by the reconversion

process. However, there are some differences between TargetLink and

Simulink which make it difficult to unambiguously map TargetLink

scaling parameters to Simulink scaling parameters:

■ Various TargetLink scaling parameter sets (that is, data type, LSB

and offset values) can be mapped to different Simulink parameter

sets. For example, TargetLink’s UInt16, LSB = 2^0, Offset = 0 can

be mapped either to Simulink ufix(16), [Slope Bias] = [2^0 0], or to

uint16. There are many cases where mapping is similarly

ambiguous.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Komentarze do niniejszej Instrukcji

Brak uwag

MATLAB SIMULINK FIXED POINT 6 Instrukcja Użytkownika Strona 8

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Nie MATLAB SIMULINK FIXED POINT 6