stm32 - Flash is corrupting after a couple of immediate resets -

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i want store device id inside flash permanently. using internal flash of stm32. can write&read flash in stm32. after writing value flash, , switch off , can read without problem. problem coming couple of different scenario such : when resetting mcu immidieatly after first reset, data inside flash becoming 0. other scenario data disappearing after while (not tested , can not entire conditions) idea flash problem ?

ide : keil mdk uvision 4

write function:

void eeprom_write(uint32_t data) {     /* porgram flash bank1 ********************************************************/          flash_unlockbank1();   /* unlock flash bank1 program erase controller */   nbrofpage = (bank1_write_end_addr - bank1_write_start_addr) / flash_page_size;  /* define number of page erased */   flash_clearflag(flash_flag_eop | flash_flag_pgerr | flash_flag_wrprterr);  /* clear pending flags */    for(erasecounter = 0; (erasecounter < nbrofpage) && (flashstatus == flash_complete); erasecounter++) /* erase flash pages */   {     flashstatus = flash_erasepage(bank1_write_start_addr + (flash_page_size * erasecounter));   }    address = bank1_write_start_addr; /* program flash bank1 */   while((address < bank1_write_end_addr) && (flashstatus == flash_complete))   {     flashstatus = flash_programword(address, data);     address = address + 4;   }    flash_lockbank1();       address = bank1_write_start_addr; /* check corectness of written data */   while((address < bank1_write_end_addr) && (memoryprogramstatus != failed))   {     if((*(__io uint32_t*) address) != data)     {       memoryprogramstatus = failed;     }     address += 4;   } }

read function

uint32_t eeprom_read(void) {     uint32_t readvalue;     flash_unlockbank1();     address = bank1_write_start_addr;     readvalue = (*(__io uint32_t*) address);     flash_lockbank1();       return  readvalue; }

fortunately, have solved issue explained here: after initialization of peripherals inside main function, calling eeprom_write() function based on conditions. once have restarted entire system, flash writing operation broken external switch on-off demand. therefore, have found couple of different solution instead of calling eeprom_write() @ beginning such calling function when low power interrupt comes. more details posted on blog : http://www.ozturkibrahim.com/tr/eeprom-emulation-on-stm32/


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