Can not flash in STM32F429i_Disco

[Linda]

Posted on March 08, 2015 at 04:10

I need to read the flash, add 1 then flash back to same address, so that I can keep track how many time the user use the device, I use:

~~~~~~~~  FLASH_Unlock();   FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |                   FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);  TimeUse= *(__IO uint32_t*)(0x04FFF3325)+1;             if (FLASH_ProgramWord(0x04FFF3325,TimeUse) == FLASH_COMPLETE)                 {                 uwAddress = uwAddress + 4;                 } ~~~~~~~~~ It seems the program can not write anything. Then I try: TimeUse= *(vu uint32_t*)(0x04FFF3325)+1; still the same problem. Why the program can write it? Thanks

[Tesla DeLorean]

Posted on March 08, 2015 at 14:43

Couple of observations

The address 0x04FFF3325 is not a valid flash address.To write you must enable programming mode.You may write data to an address only once.Incrementing a value in flash is not a good plan.Suggest you erase a whole sector and then write a use flag to an incrementing ADDRESS, and where you need to check the number of usages, counts the number marked.Use OTP if the count is fairly limited.

[Linda]

Posted on March 10, 2015 at 02:11

Thanks. This problem seems fix now.