STM32H5 and EEPROM emulation with XCUBE-EEPROM

[gh_rcl]

Hi,

I'd like to have some feedback about the use of XCUBE-EEPROM library on STM32H563.
Is it functionnal and reliable ?

After digging into the code, i have few questions:

• MPU_init()

In the MPU_init() function there's a configuration  with no explanation ?

/********************************************************************************/

** Initializes and configures the Region and the memory to be protected

*/

MPU_InitStruct.Number = MPU_REGION_NUMBER1;

MPU_InitStruct.BaseAddress = 0x08FFF800;

MPU_InitStruct.LimitAddress = 0x08FFF80F;

MPU_InitStruct.AccessPermission = MPU_REGION_ALL_RO;

HAL_MPU_ConfigRegion(&MPU_InitStruct);

/********************************************************************************/

• num_of_edata_page

With the default settings, in the OB_init() function according to me there's a problem with the computation of num_of_edata_page.

Indeed in the code below, after each reset the HAL_FLASHEx_OBProgram() is always called.

/********************************************************************************/

num_of_edata_page = ((FLASH_EDATA_BASE + (FLASH_EDATA_SIZE>>1)) - START_PAGE_ADDRESS) / FLASH_PAGE_SIZE;

register_value = FLASH->EDATA2R_CUR;

edata_enable = FLASH_EDATAR_EDATA_EN;

/* If current EDATA configration is different from new configration, Reprogram Option Byte EDATA settings */

if(register_value != (edata_enable | (num_of_edata_page - 1)))

{

/* Variable used for OB Program procedure */

FLASH_OBProgramInitTypeDef FLASH_OBInitStruct;

/* Current EDATA configuration doesn't match with new configuration. */

/* Unlock the Flash option bytes to enable the flash option control register access */

HAL_FLASH_OB_Unlock();

/* Configure 8 sectors for FLASH high-cycle data */

FLASH_OBInitStruct.Banks = bank;

FLASH_OBInitStruct.OptionType = OPTIONBYTE_EDATA;

num_of_edata_page = 1;

FLASH_OBInitStruct.EDATASize = edata_enable | num_of_edata_page;

if(HAL_FLASHEx_OBProgram(&FLASH_OBInitStruct) != HAL_OK)

{

Error_Handler();

}

/* Start option byte load operation after successful programming operation */

HAL_FLASH_OB_Launch();

/********************************************************************************/

• EDATA settings

When EDATA2_STRT=0 it means that the last sector of Bank2 that is to say

from 0x9016800 to 0x9017FFF is enabled.

Thanks in advance for your feedback.

Greg