Saving data to flash on Olimex STR-P711

Development Boards MicroMod
1

I need to save some data (a hundred bytes) in a non-volatile manner on the

above board.

The app is running from flash, bank 0, and the app note 111330 from ST

says it can read/write to the other flash bank.

However, access is very flaky- or non-existent.

I am using the str71x libraries.

My basic work flow is:

u32 data;

FLASH_Init();

data = FLASH_WordRead(0x0C0000);

if ((data == 0) ||

(data > 20))

{

// Perform calibration

data = 1;

FLASH_SectorErase(FLASH_B1F0);

FLASH_WordWrite(0x400C0000,

data);

}

The unit either “reboots” or hangs up on the SectorErase(). Then it

might write the data or hang there. Re-reading the data might show it

has written or maybe not. If I try to write the whole dataset (about

100 bytes) the unit tends to hand on the write, but some of the data

is saved.

It seemd there is some trick involved that I am missing.

Does anyone have advice/clues/pointers/working code?

Thanks

2

I finally found this on the ST forums:

“You can not Erase/Program the Flash sectors while fetching your code out of flash. So you have to load your image into RAM.”