STM32H5 high cycle flash read.

[MVanb.1]

What is the correct way to read high cycle flash data.
When i read address 0x916800 i get a Hard fault. Clearing and writing the this address works fine.
With reading i have a problem. bank 2 has EDATA enabled for the last 2 pages.

Can you give me a code example for reading the memory correctly?

[Billy OWEN]

Hi @MVanb.1 

 

This post has been escalated to the ST Online Support Team for additional assistance.  We'll contact you directly.

 

Regards,

Billy

[gh_rcl]

Hi,

Could you please share the method to read data from the high-cycle flash ?
Regards

Greg

[mahirmahota]

Hi! Did you end up getting a solution for this? I'm also trying to get high cycle flash up and running for an H5

[STOne-32]

Dear @mahirmahota ,

You can look to our example here :

STM32CubeH5/Projects/NUCLEO-H563ZI/Examples/FLASH/FLASH_EDATA_EraseProgram/Src/main.c at main · STMicroelectronics/STM32CubeH5 · GitHub

You need to configure the MPU region with right address of EDATA 

 

/* MPU Configuration--------------------------------------------------------*/
/* By default, all the AHB memory range is cacheable. For regions where caching is not
practical (High-cycle data area), MPU has to be used to disable local cacheability.
*/

like this :

static void MPU_Config(void)
{
MPU_Attributes_InitTypeDef attr;
MPU_Region_InitTypeDef region;

/* Disable MPU before perloading and config update */
HAL_MPU_Disable();

/* Define cacheable memory via MPU */
attr.Number = MPU_ATTRIBUTES_NUMBER0;
attr.Attributes = 0 ;
HAL_MPU_ConfigMemoryAttributes(&attr);

/* BaseAddress-LimitAddress configuration */
region.Enable = MPU_REGION_ENABLE;
region.Number = MPU_REGION_NUMBER0;
region.AttributesIndex = MPU_ATTRIBUTES_NUMBER0;
region.BaseAddress = EDATA_USER_START_ADDR;
region.LimitAddress = EDATA_USER_END_ADDR;
region.AccessPermission = MPU_REGION_ALL_RW;
region.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
region.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
HAL_MPU_ConfigRegion(&region);

/* Enable the MPU */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}

Also, have a look on our Reference Manual on the way, we read these Areas : OTP, RO and High Cycle Data - EDATA.

 

Hope it is helping.

STOne-32.