assign predefined data to the FLASH arrey and put values STM32F207

[Barbie]

Posted on December 23, 2012 at 10:30

Hello.

I try to put a 32 bit word in the FLASH section which need to get know value at programming and during the program it can be modify. In this way I can know next time I power up that this varible has beed update.I use the IAR ARM 6.4.I modify the link icf file this way:

/*♯♯&sharpICF♯♯♯ Section handled by ICF editor, don't touch! ****/

/*-Editor annotation file-*//* IcfEditorFile=''$TOOLKIT_DIR$\config\ide\IcfEditor\cortex_v1_0.xml'' *//*-Specials-*/define symbol __ICFEDIT_intvec_start__ = 0x08000000;/*-Memory Regions-*/define symbol __ICFEDIT_region_CONSTANT_start__ = 0x08004000;// change by Bar for placing constant in the FLASHdefine symbol __ICFEDIT_region_CONSTANT_end__ = 0x0800BFFF; // change by Bar for placing constant in the FLASHdefine symbol __ICFEDIT_region_ROM1_start__ = 0x08000000;  // for BOOTLOADERdefine symbol __ICFEDIT_region_ROM1_end__   = 0x08003FFF;  // for BOOTLOADERdefine symbol __ICFEDIT_region_ROM2_start__ = 0x0800C000;define symbol __ICFEDIT_region_ROM2_end__   = 0x080FFFFF;define symbol __ICFEDIT_region_RAM_start__ = 0x20000000;define symbol __ICFEDIT_region_RAM_end__   = 0x20020000;/*-Sizes-*/define symbol __ICFEDIT_size_cstack__ = 0x400;define symbol __ICFEDIT_size_heap__   = 0x200;/**** End of ICF editor section. ♯♯&sharpICF♯♯♯*/define memory mem with size = 4G;define region ROM1_region   = mem:[from __ICFEDIT_region_ROM2_start__   to __ICFEDIT_region_ROM2_end__] ;  //-mem:[from __ICFEDIT_region_ROM1_start__   to __ICFEDIT_region_ROM1_end__];define region VECTOR_region   =mem:[from __ICFEDIT_region_ROM1_start__   to __ICFEDIT_region_ROM1_end__];define region RAM_region   = mem:[from __ICFEDIT_region_RAM_start__   to __ICFEDIT_region_RAM_end__];define region CONSTANT = mem:[from __ICFEDIT_region_CONSTANT_start__ to __ICFEDIT_region_CONSTANT_end__ ];define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };initialize by copy { readwrite };do not initialize  { section .noinit };//place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };place in CONSTANT      {section .noinit};place in ROM1_region   { readonly };place in VECTOR_region { readonly section .intvec };place in RAM_region    { readwrite, block CSTACK, block HEAP };The idea is to leave the first section for startup and the bootloader, the second one for modify variable , the third for fix data like version ect. and from the 4th to the code.And in the main file I write at the top before the main this:

             /* Sector 1, 16 Kbytes */

         /* the last know MCU Baud Rate */

&sharppragma location=0x08004000

__no_init volatile uint32_t Baud_Rate_USART=0;

I have 2 problems about it.I can't see in the memory windows the FLASH area. Is it possible from the view menu?I see that for FLASH assign I need to write no_init. SO how I can give it perleminary values because i see it doesn't?RegardsBar. #variable-assign-to-flash

[Tesla DeLorean]

Posted on December 23, 2012 at 14:52

Well, you're not going to want to use noinit if you expect a value to be set.

The most sensible solution is to have code to identify the uninitialized state and to write default values. You could also write specific/calibration values during a final test procedure on the board. Placing all this in configuration structure, with a signature and checksum, is also something to consider. I'd probably use ''const'' or ''static const'' to define at variable at a specific location, but modified outside of normal C functionality (ie a simple write is not possible)

const int baud @ 0x08004000 = 9600;

http://supp.iar.com/Support/?note=36121

[Barbie]

Posted on December 23, 2012 at 17:06

Thanks for the answer.

I solve the init problem.But I have anther problem.Also I have define a special place for the CONSTANT  from  0x08004000 to 0x0800BFFF.and the start up code from 0x08000000 to 0x08004000and the code I ask to start from 0x0800C000 to 0x080FFFFFhere is the setting in link icf

/*###ICF### Section handled by ICF editor, don't touch! ****/

/*-Editor annotation file-*//* IcfEditorFile=''$TOOLKIT_DIR$\config\ide\IcfEditor\cortex_v1_0.xml'' *//*-Specials-*/define symbol __ICFEDIT_intvec_start__ = 0x08000000;/*-Memory Regions-*/define symbol __ICFEDIT_region_CONSTANT_start__ = 0x08004000;// change by Bar for placing constant in the FLASHdefine symbol __ICFEDIT_region_CONSTANT_end__ = 0x0800BFFF; // change by Bar for placing constant in the FLASHdefine symbol __ICFEDIT_region_ROM1_start__ = 0x08000000;  // for BOOTLOADERdefine symbol __ICFEDIT_region_ROM1_end__   = 0x08003FFF;  // for BOOTLOADERdefine symbol __ICFEDIT_region_ROM2_start__ = 0x0800C000;define symbol __ICFEDIT_region_ROM2_end__   = 0x080FFFFF;define symbol __ICFEDIT_region_RAM_start__ = 0x20000000;define symbol __ICFEDIT_region_RAM_end__   = 0x20020000;/*-Sizes-*/define symbol __ICFEDIT_size_cstack__ = 0x400;define symbol __ICFEDIT_size_heap__   = 0x200;/**** End of ICF editor section. ###ICF###*/define memory mem with size = 4G;define region ROM1_region   = mem:[from __ICFEDIT_region_ROM2_start__   to __ICFEDIT_region_ROM2_end__] ;  //-mem:[from __ICFEDIT_region_ROM1_start__   to __ICFEDIT_region_ROM1_end__];define region VECTOR_region   =mem:[from __ICFEDIT_region_ROM1_start__   to __ICFEDIT_region_ROM1_end__];define region RAM_region   = mem:[from __ICFEDIT_region_RAM_start__   to __ICFEDIT_region_RAM_end__];define region CONSTANT = mem:[from __ICFEDIT_region_CONSTANT_start__ to __ICFEDIT_region_CONSTANT_end__ ];define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };initialize by copy { readwrite };do not initialize  { section .noinit };place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };place in CONSTANT      {readonly section .data_init};place in ROM1_region   { readonly };place in VECTOR_region { readonly section .cstart };place in RAM_region    { readwrite, block CSTACK, block HEAP };I don't get it in the Memory map.Attach the start of the map where you can see the reset vector start on 0x08000000 but immediate after it the code is writing.

''A1'':  place at 0x08000000 { ro section .intvec };

''P1'':  place in [from 0x08000000 to 0x080fffff] { ro };''P2'':  place in [from 0x20000000 to 0x20020000] { rw, block CSTACK, block HEAP };  Section            Kind        Address    Size  Object  -------            ----        -------    ----  ------''A1'':                                      0x184  .intvec            ro code  0x08000000   0x184  startup_stm32f2xx.o [1]                            - 0x08000184   0x184''P1'':                                     0x478c  .text              ro code  0x08000184  0x115c  APP_handle_main.o [1]  .text              ro code  0x080012e0   0x1fc  TIM_APP_handle.o [1]  .text              ro code  0x080014dc   0x7f8  ADC_DMA_APP_handle.o [1]Where I wrong in the link icf file and what can be done to fix it?RegardsBar.