Can't connect STM32F103C8T6

[thequyen831]

Yesterday, I have flashed faulty code to my STM32, and now I can't connect to it via ST-Link or the UART bootloader. I've tried using STM32 ST-Link Utility and STM32CubeProgrammer, but neither works. How can I erase the flash memory? Do I need to buy a new chip?
i using stm32f103c8t6

[TDK · Accepted solution]

Holding BOOT0 high during reset will let you connect and erase/recover the chip, if it's a genuine ST chip, which it's probably not.

[Andrew Neil]

Welcome to the forum.

Please see How to write your question to maximize your chances to find a solution for best results.

Note that the old ST-Link Utility is long obsolete - STM32CubeProgrammer is the current tool

Are you using a genuine STM32 ?

What board is it on ?

Are you using a genuine ST-Link ?

https://community.st.com/t5/stm32-mcus/how-to-recognize-a-genuine-st-link-v2-versus-a-cloned-one/ta-p/49471

How are you connecting the ST-Link ?

https://community.st.com/t5/stm32-mcus/how-to-solve-connection-errors-when-connecting-and-programming/tac-p/786977

https://community.st.com/t5/stm32-mcus/how-to-solve-debugger-connection-issues/ta-p/49693

[thequyen831]

I think I'm using a clone STM32 board and a clone ST-Link, but in the past it worked normally. It was only after I uploaded code yesterday that divided a number by zero, and since then the board hasn’t been able to connect. Is there any way to completely erase the code from the chip?

[thequyen831]

By holding BOOT0 high during reset, will I be able to connect via ST-Link or UART?

[thequyen831]

Oh my God, your solution helped me a lot! You're my hero, bro!

[Andrew Neil]

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@thequyen831 wrote:

I think I'm using a clone STM32 board and a clone ST-Link

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You need to check that for sure!

I gave you a link on how to check the ST-Link; in particular, see this part:

https://community.st.com/t5/stm32-mcus/how-to-recognize-a-genuine-st-link-v2-versus-a-cloned-one/tac-p/703663/highlight/true#M965

Post a link to where you bought the board.

Photos of the board & ST-Link would also help.

Again, please see: How to write your question to maximize your chances to find a solution

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@thequyen831 wrote:

but in the past it worked normally. 

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That's the trouble with using clones/fakes: they could have been just barely working before - and have now just gone over the edge.

There are many posts here where many people have wasted many hours on these fakes/clones.

Avoid the hassle - just get a genuine ST board!

eg, NUCLEO-F103RB - which comes complete with a genuine ST-Link. 

https://www.st.com/en/evaluation-tools/nucleo-f103rb.html