Eeprom Emulation on STM32H723

[mazotcu16]

Hello, i am trying to implement Eeprom Emulation on STM32H723 using the code that ST provided in STM32CubeH7-Master for STM32H743 series. In the EE_Init function, first thing that function does is this line of code:

PageStatus0 = (*(__IO uint16_t*)PAGE0_BASE_ADDRESS); 

#define PAGE0_BASE_ADDRESS    ((uint32_t)(EEPROM_START_ADDRESS + 0x0000))

when i look at the value of PAGE0_BASE_ADDRESS, it corresponds to 6U+0x000. Is that normal? Doesnt this mean that we are reading from ITCM RAM?

[mƎALLEm · Accepted solution]

Hello @mazotcu16 ,

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@mazotcu16 wrote:

when i look at the value of PAGE0_BASE_ADDRESS, it corresponds to 6U+0x000. Is that normal? Doesnt this mean that we are reading from ITCM RAM?

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Sorry, but how? I don't know which example you are referring to, but from the example provided in STM32CubeH7 here the value seems correct:

In eeprom.h :

#define EEPROM_START_ADDRESS  ADDR_FLASH_SECTOR_6_BANK2 /* sector6 of bank 2 */

In main.h:

#define ADDR_FLASH_SECTOR_6_BANK2     ((uint32_t)0x081C0000) /* Base @ of Sector 6, 128 Kbytes */

So PAGE0_BASE_ADDRESS = 0x081C0000

[LCE]

My advice: don't use flash as eeprom on that H7.

It has 128 kB flash blocks, and even when overwriting only 1 bit you must erase the complete block.

That takes some time (which halts basically everything), and you will always need some RAM buffer to backup the rest.