topic Confusion between Data_seg and code_seg in CodeWarrior for MCU

Confusion between Data_seg and code_seg

vihaanred — Mon, 19 Jan 2015 10:01:18 GMT

Hi,

I have seen the following code and i have doubts

the prm file is having the following statements

test.prm

/* commands */

PARAMETERS INTO PAGE_E0

/*end of prm file */

where the PARAMETERS is a sections having some constants and placed into the flash memory page_e0.

i have seen the PARAMETERS in the test.c file as

#pragma DATA_SEG __GPAGE_SEG PARAMETERS

/* PARAMETERS CONSTANTS */

#Pragma DATA_SEG DEFAULT

my doubt is PARAMETERS is a constant and located in the flash memory. What is th meaning of declaring it as DATA_SEG? Am i correct in assuming that the statement is not required. (May be the idea is to copy the variables from flash to ram but the statement is not required).

Thanks and regards,

VIhaan

Re: Confusion between Data_seg and code_seg

ZhangJennie — Tue, 20 Jan 2015 05:53:10 GMT

Hi vihaan,

from my understanding, you define const data in PARAMETERS section which is paged Flash memory. Correct?

if it's true, we need to use key word CONST_SEG instead of DATA_SEG. for example:

#pragma CONST_SEG __GPAGE_SEG PARAMETERS

/* PARAMETERS CONSTANTS */

#Pragma CONST_SEG DEFAULT

can this help you to solve the problem?

Have a great day,
Zhang Jun

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Re: Confusion between Data_seg and code_seg

vihaanred — Tue, 20 Jan 2015 05:56:36 GMT

yes it is correct i think it is a mistake to keep DATA_SEG