unexpected interrupt when running the example FLASH_EraseProgram for NUCLEOWB15

[VSaro.1]

Hi,

I need to write some config data to the flash and tried to start from the example FLASH_EraseProgram for NUCLEOWB15. But I got problems already when running the example without any modification. My setup:

• NUCLEO-WB15CC board
• FLASH_EraseProgram without modifications
• STM32CubeIDE Version: 1.10.1 Build: 12716_20220707_0928 (UTC)
• Import STM32 Cube Example->Board NUCLEO-WB15CC->FLASH_EraseProgram
• build, and DEBUG FLASH_EraseProgram
• and the debugger ends in the Default Handler Infinite Loop

Wen I look at the registers, the program counter shows WWDG_IRQHandler, maybe a watchdog problem?

Any help is appreciated!

Regards Volker

Content of the registers:

General Registers      General Purpose and FPU Register Group   

   r0   56      

   r1   536871108      

   r2   1476411392      

   r3   1073807810      

   r4   536871068      

   r5   0      

   r6   0      

   r7   536883164      

   r8   0      

   r9   0      

   r10   0      

   r11   0      

   r12   0      

   sp   0x20002fb8      

   lr   -7      

   pc   0x80001ec <WWDG_IRQHandler>      

   xpsr   16777219      

   d0   0      

   d1   0      

   d2   0      

   d3   0      

   d4   0      

   d5   0      

   d6   0      

   d7   0      

   d8   0      

   d9   0      

   d10   0      

   d11   0      

   d12   0      

   d13   0      

   d14   0      

   d15   0      

   fpscr   0      

   primask   0      

   basepri   0      

   faultmask   0      

   control   0      

   msp   0x20002fb8      

   psp   0x0      

   s0   0      

   s1   0      

   s2   0      

   s3   0      

   s4   0      

   s5   0      

   s6   0      

   s7   0      

   s8   0      

   s9   0      

   s10   0      

   s11   0      

   s12   0      

   s13   0      

   s14   0      

   s15   0      

   s16   0      

   s17   0      

   s18   0      

   s19   0      

   s20   0      

   s21   0      

   s22   0      

   s23   0      

   s24   0      

   s25   0      

   s26   0      

   s27   0      

   s28   0      

   s29   0      

   s30   0      

   s31   0      

[VSaro.1]

I tested other examples, just to see if there is a pattern:

- FLASH_WriteProtection same problem

- WWDG_Example works

- WWDG_RefreshUntilUserEvent_Init works

- GPIO_IOToggle works

- EXTI_ToggleLedOnIT_Init works

- BSP_Example works

[VSaro.1]

Investigating further I found a difference of FLASH_EraseProgram to WWDG_Example in the NVIC settings. I added "Generate IRQ handler" accordingly and now the program ends in the HardFault_Handler instead of the Default-handler:

[Semer CHERNI]

Hello @VSaro.1​ 

First thanks for posting.

In this case I recommend that you check the user configuration under the Option Bytes for your SOC with CubeProgrammer.

Specifically the IDWGSW it should be Unchecked.

 

Kind regards,

Semer.

[VSaro.1]

Thanks Semer, it seems to work now.

Kind regards

Volker

[VSaro.1]

Hello Semer,

ok, after unchecking IDWGSW it doesn't end in the WWDG_IRQHandler() but...

the program never returns from the call to HAL_FLASHEx_Erase(&EraseInitStruct, &PageError), see line 145 in FLASH_EraseProgram/Src/main.c.

Is there another option maybe?

Kind regards

Volker