MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Guide de l'utilisateur télécharger pdf (Page 209)

100

101

Preventing Memory Corruption When You Export C oefficients to Processor Memory

Preventing Memor y Corruption When You Export

Coefficients to

Processor Memor y

In this section...

“Allocating Sufﬁcient or Extra Memory for Filter Coefﬁcients” on page 5-15

“Example: UsingtheExportedHeaderFiletoAllocateExtraProcessor

Memory” on page 5-15

“Replacing Existing Coefﬁcients in Memory w ith Updated Coef ﬁcients”

on page 5-16

“Example: Changing Filter Coefﬁcients Stored on Your Processor” on page

5-17

Allocating Su

fficient or Extra Memory for Filter

Coefficient

You can alloc

ate extra memory by editing the generated ANSI C header ﬁle.

You can then l

oad the associated program ﬁle into your pro c esso r as described

in “Example:

Using the E xported Header File to Allocate Extra Process or

Memory” on p

age 5-15. Extra memory lets you chan g e ﬁlter coefﬁcients and

overwrite e

xisting coef ﬁcients stored in processor memory more easily.

To prev ent p

roblems when you update ﬁlter coefﬁcients in a project, , such as

writing coe

fﬁcients to unintended memory locations, use the

C header file

export mod

e option in FDATool to update ﬁlter coefﬁcients in your program.

Example: U

sing the Exported Header File to Allocate

Extra Proc

essor Memory

You can edi

t the generated h eader ﬁle so the linked program ﬁle all ocates

extra pro

cessor memory. By allocating extra memory, you avoid the problem

of insufﬁ

cient m emory when you export new coefﬁcients directly to allocated

memory.

For examp

le, changing the following command in the header ﬁle:

const real64_T NUM[47] = {...}

5-15

1 2 ... 204 205 206 207 208 209 210 211 212 213 214 ... 574 575

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MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Guide de l'utilisateur Page 209

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