DFU mode read out protection

[Draxter]

Hello, 

I am trying to connect to the STM32F072C8T6 microcontroller via USB in the STM32CubeProgrammer, however I am getting:

"Device is under read out protection ! If you want to disable RDP please reconnect with Read Unprotect enabled"

So, when I check the Read Unprotect (MCU) checkbox, I get:

"Please Power off Power on your device."

After turning the power off/on, I see the same messages. I cannot connect to the MCU via USB in the STM32CubeProgrammer.

I have tried different versions of STM32CubeProgrammer:

• v2.16.0
• v2.15.0
• v.2.13.0
• v.2.10.0
• v.2.8.0

Moreover I tried on second computer with Windows 11 and I have the same issue.

I'm trying to connect my custom board, but I also checked another hardware board (BluePill ) with the same STM32F072C8T6 MCU and it doesn't work either.

Interestingly, using the DFU-util v0.8 program I can connect to the MCU and successfully read/write memory:

[Amine_Jridi · Accepted solution]

Hello @Draxter 

Regarding this issue, we are aware of it and it's currently under investigation.

Internal ticket number: 171192 (This is an internal tracking number and is not accessible or usable by customers).

As a workaround, we suggest connecting your MCU using a HUB instead of plugging it directly into the PC.

Thanks,

Amine.

[Draxter]

@Amine_Jridi thank you. Connecting the board to an external USB HUB solves the problem.

We are unable to understand what is root cause. Why use a USB HUB instead of a direct connection to a computer?