STM32G474CE flash errasing after power on

[MKles]

Hi,

I save my configuration structure to flash memory. It work. Data is stored in flash. But after unplug ang plug power memory page is writen by 0xFF.

int eepromSaveConfig() {

uint32_t error;

uint64_t *configPtr;

uint32_t address;

FLASH_EraseInitTypeDef erase;

HAL_FLASH_Unlock();

__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);

erase.Banks = FLASH_BANK_1;

erase.NbPages = 1;

erase.Page = 127;

erase.TypeErase = FLASH_TYPEERASE_PAGES;

__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);

if (HAL_FLASHEx_Erase(&erase, &error) != HAL_OK){

logging("Eeprom save error -1", DEBUG);

return -1;

}

__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);

configPtr = (uint64_t*) &controllerConfig;

address = 0x0803F800;

for (uint16_t i = 0; i < (sizeof(ControllerCfg_t) - 8); i += 😎 {

if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address,

*configPtr))

return -2;

address += 8;

configPtr++;

}

HAL_FLASH_Lock();

logging("Eeprom save OK", DEBUG);

eepromReadConfig();

return 1;

}

int eepromReadConfig(){

uint8_t *configPtr;

configPtr = (uint8_t*) 0x0803F800;

memcpy( &controllerConfig, configPtr, sizeof(ControllerCfg_t));

return 1;

}

What could be the reason for this?

[waclawek.jan]

> Data is stored in flash

Do you verify it, i.e. read back immediately after writing and compare/check?

JW

[MKles]

Yes. I read config/data after save and compare it. I also check this by scroll memory

[waclawek.jan]

Can you try a page in the lower end of memory?

I have no experience with the G4, but they have this switchable buswidth/banking, can't this be related?

JW

[MKles]

I thought that I solved problem. But It came back. Main cause was 

inaccurate soldering one VCC pin. Indication to this it was fine working at other mcu. I noticed only this problem caused by incorrect connection.

Thank you Jan for involvement.