Error: failed to erase memory

[pozeetive]

Hello,

So, i have created a small project in which the diagnostic information was saved in the internal flash of STM32F429ZET6 at the time of a crash. So, to test this project i have triggered usage-fault exception in an infinite loop by dividing a number via 0.
In the exception handler, i'm capturing and storing the diagnostic information in sector 0 of internal flash (I have modified the linker script to reserve this area, and configured sector 0 as non-executable area via MPU). The below is the logic i am using to store the diagnostic info.

 

FLASH_OBProgramInitTypeDef OBInit;

HAL_FLASH_OB_Unlock();

OBInit.OptionType = OPTIONBYTE_WRP;
OBInit.WRPSector = OB_WRP_SECTOR_0; 
OBInit.WRPState = OB_WRPSTATE_DISABLE; 

HAL_FLASHEx_OBProgram(&OBInit);
 
HAL_FLASH_OB_Launch();
HAL_FLASH_OB_Lock();


HAL_FLASH_Unlock();

HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, list_ad, p_gnl[i]);

HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, diag_ad, p_gnl[i])

HAL_FLASH_Lock();

HAL_FLASH_OB_Unlock();

OBInit.OptionType = OPTIONBYTE_WRP;
OBInit.WRPState = OB_WRPSTATE_ENABLE;
OBInit.WRPSector = OB_WRP_SECTOR_0;

HAL_FLASHEx_OBProgram(&OBInit);
HAL_FLASH_OB_Launch();
HAL_FLASH_OB_Lock();

 

And now, after i flash this code, i could not flash other code, this is the error i'm getting :

Error: failed to erase memory

 

 

Error: failed to erase memory

Encountered Error when opening C:\ST\STM32CubeIDE_1.17.0\STM32CubeIDE\plugins\com.st.stm32cube.ide.mcu.externaltools.cubeprogrammer.win32_2.2.0.202409170845\tools\bin\STM32_Programmer_CLI.exe

Error in STM32CubeProgrammer

Shutting down...

Exit.

 

Please help me fix this issue.

Thanks in advance.

 

[TDK]

Dont do stuff with flash in the first 1s of a program running or the debugger will have a hard time maintaining a connection.

Hold BOOT0 high during reset to boot in the bootloader and erase the chip to recover.

[pozeetive]

Hello @TDK,

I have followed your suggestion, i have provided 3.3v to BOOT0 pin and in STM CUBE Programmer and in ST-LINK Configuration i have kept the mode 'under reset', and i have tried to connect via resetting the MCU, but the connection failed and it says "the target was held under reset", but when i try to connect without resetting it is connected but i'm unable to perform chip erase/flash operations. 

 

[TDK]

> but i'm unable to perform chip erase/flash operations. 

Why not? What happens when you try?

[pozeetive]

I'm getting an error like unable to perform sector erase as the sector is protected something like this, i have also tried to disable the nWRP for all sectors but it is also failing and i'm getting error like this operation is initiated after OB_LAUNCH.