topic Re: Using Pragma in MCUXpresso in MCUXpresso General

Using Pragma in MCUXpresso

m_giraldi — Tue, 25 Jun 2019 15:57:20 GMT

I'm wondering how to use Pragam on MCUXpresso IDE (MKE16Z64xxx4). How should I proceed? I need to put an array of values in Flash.

#pragma ...

const float min_max [23] [2]
=
{
{3.1415, 2.54},
...
};

Re: Using Pragma in MCUXpresso

BlackNight — Tue, 25 Jun 2019 17:19:39 GMT

What kind of attribute do you want to use?

The standard way to tell the compiler special ways for gcc is using __attribute__ (see Using the GNU Compiler Collection (GCC): Common Variable Attributes ).

I hope this helps,

Erich

Re: Using Pragma in MCUXpresso

m_giraldi — Tue, 25 Jun 2019 19:59:30 GMT

Erich,

Imagine the data below ( const unsigned char texto[4][128] ), if I declare this way, this data will be allocated in the SRAM, I do not want this to happen, I need this data to be allocated in Flash. In Codewarrior I used the pragma and this data was allocated in ROM.

// Codewarrior ========================================
#pragma CONST_SEG ROM

/ * "in here I put all the const that I needed to be allocated in ROM" * /

const unsigned char texto[4][128] = { .... };

#pragma CONST_SEG DEFAULT

//==================================================

How to allocate " const unsigned char texto[4][128] " in Flash and not in SRAM using MCUXpresso?

I'm using MKE16Z64VLF4

"data"

const unsigned char texto[4][128] = { {0xFF, 0xFF, ... }, {0xFF, 0xFF, ....}, {0xFF, 0xFF, ...}, {0xFF, 0xFF, ...} };

Re: Using Pragma in MCUXpresso

converse — Tue, 25 Jun 2019 20:06:45 GMT

Read the MCUXpresso Usr Guide. NXP provide macros to help you do this, as described in the chapter on Placing specific code/data items. (Chapter 18.13 in latest user guide).

Re: Using Pragma in MCUXpresso

BlackNight — Wed, 26 Jun 2019 08:37:28 GMT

If you are using the default/standard SDK linker files, then all constant objects get placed in FLASH anyway, so you don't need any #pragma.

I hope this helps,

Erich

Re: Using Pragma in MCUXpresso

zmm — Thu, 29 May 2025 02:34:37 GMT

I'm wondering how to use Pragma on VScode MCUXpresso。I need to put a piece of code into the specified section.But it was ignored by the compiler.
#pragma GCC push_options
#pragma GCC section text=".custom_code"
void func(void)
{}
.
.
.
#pragma GCC pop_options

warning:ignoring '#pragma GCC section' [-Wunknown-pragmas]