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:

[Gaucho]

dfuse do not allow to flash elf file. it seems to not be a solution

[Gaucho]

where can i read how this incident has ended up. where is ticket 171192  ?

[zeboss49]

Hello,

same issue with an STM32F429.

In my project, using a HUB does not solve the issue.
Maybe because the HUB is an USB3 HUB connected to a USB3 port on the PC.

It makes sense if the issue is related to speed.

I'll give a try using an USB2 port and come back to share my experience.

[Draxter]

Hi @zeboss49,

Yes, please try connecting through a USB 2.0 port (or via a USB 2.0 hub connected to a USB 2.0 host).
That would be really helpful for the community to confirm whether the issue is related to USB 3.0 compatibility.

Thanks for checking and sharing your results!

[TLin.5]

Does this affect STM32U5 series as well?

[zeboss49]

Hello,

Iconducted some tests with USB2.

Direct connection to PC USB2 Port, RDP error still present.

Connection to PC USB2 Port through an USB2 HUB no more RDP error, but some other errors (Please, see attached files.)

Maybe these errors are related to the way I'm trying to use DFU.

I do not have access to the BOOT pins and I'm trying to use the DFU class for USB Device in CubeIDE.

Maybe I missed some steps (something like suspending program execution...) to make things work properly.

[Gaucho]

Another working solution is the usage of app for android:

https://play.google.com/store/apps/details?id=com.yatrim.stmdfuusb&pcampaignid=web_share

or equivalent. This is a really most efficient way to program high number of boards in less time.