STM32C071 download issue

ChrisMiller · ‎2025-04-14

Hello,

We are using STM32C071GBU6 MCU chip with USB device interface function. Now we have a problem using ST-Link utility tool to download BIN file to MCU:

ST-Link utility tool always report: connection lost.

In our design we use USB micro-B type port to supply power for the board.We checked MCU voltage and value is 3.2V, which is normal.

While using the same programmer and IDE tool, we can successfully connect STM32F446 MCU(while STM32F446 board power supply is from DC regulator power).

Please see attached pictures for details. Please help find the root cause. Much thanks!

Tesla DeLorean · ‎2025-04-14

Pretty sure ST-LINK Utilities is the wrong tool for the C0 part. You would need to be using STM32 Cube Programmer for these newer parts.

The CM0 also tend to need low connectivity speeds.

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View solution in original post

Tesla DeLorean · ‎2025-04-14

Pretty sure ST-LINK Utilities is the wrong tool for the C0 part. You would need to be using STM32 Cube Programmer for these newer parts.

The CM0 also tend to need low connectivity speeds.

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Up vote any posts that you find helpful, it shows what's working..

ChrisMiller · ‎2025-04-15

Hi,

I used latest version stm32cubeprogrammer: stm32cubeprg-win64-v2-19-0, but still fail: "no STM32 target found", and for STM32F446 MCU, tool is OK.

Is there possibility that MCU is in system bootloader mode and SWD interfaced is disabled?

But I figure that ST-LINK programming should always be available. Or possible HW issue?

Thanks.