After testing the firewall example, NUCLEO-L476RG is resetting continuously even running a simple blinking example with no firewall function.

[eziya76]

Board : NUCLEO-L476RG

IDE : STM32CubeIDE 1.9.0

Driver : STM32Cube_FW_L4_V1.17.2

Hello,

Recently, I tested the firewall example using the NUCLEO-L476RG, and I have been experiencing strange behaviour since then.

After testing the firewall example, the board is resetting continuously even running a simple blinking example with no firewall function.

I checked the reset flag and found that RCC_FLAG_SFTRST is set. As far as I know, the firewall function should not work after MCU reset, which part should I check first?

For your information, it is not resetting during step debugging using STMCubeIDE.

Thanks.

[eziya76]

I found the reason.

When I was testing, I did RDP regression several times.

today I found that some of the option bytes are different from the default values.

I modified them by writing default values in the STM32CubeProgrammer editor

and all works fine.