STM32H7 HAL Flash Program

[Gasper Korinsek]

Posted on June 29, 2017 at 14:22

7There is a potential bug in the HAL library ver 1.0 for the STM32H7:

Functions FLASH_Erase_Sector and FLASH_MassErase (file stm32h7xx_hal_flash_ex.c,) change the PSIZE value in the FLASH->CRx register according to the VoltageRange argument. The function HAL_FLASH_Program (stm32h7xx_hal_flash.c) seems to expect the default PSIZE value (64-bit).

In other words: calling FLASH_Erase_Sector or FLASH_MassErase functions with a VoltageRange argument other than FLASH_VOLTAGE_RANGE_4, changes the behaviour of the HAL_FLASH_Program function.

Separate questions:

Is there any plan to support 8, 16 or 32-bit programming parallelisms in the HAL_FLASH_Program API?

#flash #hal #stm32h7

[Imen.D]

Hello,

We have already passed this issue along to our development team.

A new API __HAL_FLASH_SET_PSIZE() will be added to Flash driver to set the Flash parallelism parameter for Program and Erase operations.

Please, keep an eye out for the next update !

Kind Regards,

Imen

[DDosh.2003]

can you please send me the application code

[EZamo.1]

I'm using the default linker script (Auto-generated by STM32CubeIDE for the STM32H743) and it shows the various sections getting mapped to the 2MB of flash. However, how do I know which memory/sector is unused and therefore safe to FLASH_Erase_Sector / HAL_FLASH_Program ? I don't have too much data that I need in NVM, but according to UM2217, it sounds like you have to erase an entire 128Kbytes sector, but flashing is done in 32-byte chunks only (256-bit).. ?

[Pavel A.]

> how do I know which memory/sector is unused

Usually one can be pretty sure that the very first sector at 0x08000000 (bank 1 sector 0) is occupied by user application or bootloader.

About the rest, you can only check whether a whole page is erased (all bytes are FFs) or not.

>  it sounds like you have to erase an entire 128Kbytes sector, but flashing is done in 32-byte chunks only (256-bit).

Correct.

-- pa

[EKosa.1]

Hi Volker Bremauer,

Can you provide the project in public?

Thanks in advance.