FLASH Erase Time

[Kim.Andy]

Posted on January 26, 2016 at 14:15

Hello..

I want to erase flash memory in STM32F207 by sector.

But the Erase time is 1sec typically like following table(datasheet).

(3.3V VPP, 120MHz)

   

I want to reduce the erase time into about 100ms ~ 300ms.

How can I do it?..

Thanks.

[Tesla DeLorean]

Posted on January 26, 2016 at 15:47

How can I do it?..

Bend time and space?

Journal writes so you don't do continuous erase/write sequences.

[Kim.Andy]

Posted on January 27, 2016 at 01:00

Hello!!

The flash erase time may be about below 100ms on the code of My predecessor.

But the erase time of my code is over 2sec like the above table.

I think that there may be any setting to reduce the erase time.

My predecessor and I use the same code to erase the flash like below.

--------------------------------------------------------------------------------

int8_t FLASH_If_Erase(uint32_t StartSector)

{

  uint32_t FlashAddress;

  

  FlashAddress = StartSector;

  /* Device voltage range supposed to be [2.7V to 3.6V], the operation will

     be done by word */ 

 

  if (FlashAddress <= (uint32_t) USER_FLASH_LAST_PAGE_ADDRESS)

  {

#ifndef USE_GES_MEM_CONFIG

    //FLASH_EraseSector(FLASH_Sector_4, VoltageRange_3); /* 64 Kbyte */

    //FLASH_EraseSector(FLASH_Sector_5, VoltageRange_3); /* 128 Kbyte */

    FLASH_EraseSector(FLASH_Sector_6, VoltageRange_3); /* 128 Kbyte */

    FLASH_EraseSector(FLASH_Sector_7, VoltageRange_3); /* 128 Kbyte */

    //FLASH_EraseSector(FLASH_Sector_8, VoltageRange_3); /* 128 Kbyte */

    //FLASH_EraseSector(FLASH_Sector_9, VoltageRange_3); /* 128 Kbyte */

    //FLASH_EraseSector(FLASH_Sector_10, VoltageRange_3); /* 128 Kbyte */

    //FLASH_EraseSector(FLASH_Sector_11, VoltageRange_3); /* 128 Kbyte */

#else

    FLASH_EraseSector(FLASH_Sector_6, VoltageRange_3); /* 128 Kbyte */

    FLASH_EraseSector(FLASH_Sector_7, VoltageRange_3); /* 128 Kbyte */

#endif

  }

  else

  {

    return (1);

  }

--------------------------------------------------------------------------------

How can I reduce the erase time?

Is there any setting to do that?

Thanks.

[Tesla DeLorean]

Posted on January 27, 2016 at 02:19

What can you change in your system? Can you increase VPP?

The Data Sheet is based on the physics at work, you really can't wave a magic wand and change that.

We put our configuration data in the 16KB sectors, because they are quicker. Any reason you've picked the biggest and slowest ones?