EEPROM – Flash

[bruno]

Hi,

I’m trying to write to and read from flash(stm32F105RB) – to store data like an EEPROM.

I have already set the liker script(STM32F105RB_flash.lds):

MEMORY
{
FLASH (RX) : ORIGIN = 0x08000000, LENGTH = 126K
SRAM (RWX) : ORIGIN = 0x20000000, LENGTH = 64K
EEPROM (RWX) : ORIGIN = 0x0803F800, LENGTH = 2K
}

SECTIONS
{
.user_data :
{
. = ALIGN(4);
*(.user_data)
. = ALIGN(4);
} > EEPROM

My code is like:

__attribute__((__section__(“.user_data”)))  uint8_t userConfig;

/*Write*/

HAL_FLASH_Unlock();
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGERR);
FLASH_PageErase(0x0803F800);  //page 127
userConfig = 0;
HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD, (uint32_t) userConfig, data);
HAL_FLASH_Lock();

//read

uint32_t test = *((uint16_t *)0x0803F800);

It compiles Ok. But when i try do flash:

 

compare-sections
&”compare-sections\n”
~”Section .user_data, range 0x803f800 — 0x803f804: MIS-MATCHED!\n”
~”Section .isr_vector, range 0x8000000 — 0x80001e4: matched.\n”
~”Section .text, range 0x80001e4 — 0x801315c: matched.\n”

 

 

 

 

 

[support]

Hi,

Please check the OpenOCD window for errors related to FLASH programming. This should explain why the initial programming fails.

Please also double-check that you are not comparing the .user_data section after it is rewritten by your program and no longer matches the contents recorded in the ELF file.

[Author]

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