topic Re: how to store const structure in particular memory location in kds in Kinetis Design Studio

how to store const structure in particular memory location in kds

sudhakarp — Mon, 29 Jun 2015 12:08:59 GMT

Hi,

i am using MK64FN1M0VLL12 controller. i am using KDS2.0 IDE. i want to store const structure in particular memory location.

how to do that one. assume i want to store const structure at 0x64000. give some example it will helpful to all.

my structure like this

const struct config_params default_params =

{

0xC0A800FE, //local IP address

7727, //local port No. 7727

7728, //local port No. 7728

7729, //local port No. 7729

7730, //local port No. 7730

0xFFFFFF00, //local Netmask

0xC0A800D2, //Gateway

}

thanks and regards,

sudhakar p

Re: how to store const structure in particular memory location in kds

ZhangJennie — Tue, 30 Jun 2015 03:59:41 GMT

Hi sudhakar p,

I just made a demo code of allocating const struct in flash. see attached.

to avoid optimization, I add KEEP (*(.rodata)) in .text section in *.ld file.

can this help you?

Have a great day,
Zhang Jun

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Re: how to store const structure in particular memory location in kds

sudhakarp — Tue, 30 Jun 2015 04:15:01 GMT

hi ,

thanks for your reply. but i want to store CONST structure in perticular memory address only i want that structure in 0x64000 location only for that what can i do..?

thanks and regards,

sudhakar p

Re: how to store const structure in particular memory location in kds

ondrejlutera — Wed, 01 Jul 2015 08:47:48 GMT

Hi sudhakar p,

I hope this helps Defining Variables at Absolute Addresses with gcc | MCU on Eclipse

simple example :

const uint8_t __attribute__((section (".my_rodata"))) myData[256];

add this to the linker file :

.my_rodata_block 0x64000 :

{

KEEP (*(.my_rodata))

} > m_text

Best Regards,

Ondrej

Re: how to store const structure in particular memory location in kds

ZhangJennie — Wed, 01 Jul 2015 09:26:26 GMT

Hi,

I just modify the demo code .

see attached,

in ld file, i define a section called my_const:

my_const

(RX) : ORIGIN = 0x00000410, LENGTH = 0x00000100

.my_const :

{

KEEP(*(.myconst))

} > my_const

in C code, define structure as

const config_params __attribute__((section(".myconst"))) params_to_myconst=

{

0x12345678, //local IP address

0xabcd, //local port No. 7727

};

in memory window you will see the params_to_myconst allocated from 0x410.

can this help?

Have a great day,
Zhang Jun

Re: how to store const structure in particular memory location in kds

sudhakarp — Wed, 01 Jul 2015 10:57:08 GMT

hi,

can you give detail about "RelocateFunction" API function in internal flash writing.

flashSSDConfig.CallBack = (PCALLBACK)RelocateFunction((uint32_t)__ram_for_callback , CALLBACK_SIZE , (uint32_t)callback);

g_FlashLaunchCommand = (pFLASHCOMMANDSEQUENCE)RelocateFunction((uint32_t)__ram_func , LAUNCH_CMD_SIZE ,(uint32_t)FlashCommandSequence);

what is the use of this function and how to use this function

regards,

sudhakar p

Re: how to store const structure in particular memory location in kds

ZhangJennie — Thu, 02 Jul 2015 03:07:53 GMT

because one flash can not be written and read parallel. for writing flash, we need copy flash routine from flash to RAM then execute flash command and programming sequence from RAM.

I don't know where you got the code, but i think these code should on this regard.

Have a great day,
Zhang Jun