Failed to program STM32H743ZI2 board and Debug terminal also get hang with USB isolatorfrom Linear technology

[DhirajThakur]

I expected to connect my PC to a nucleo STM32H743ZI2 board via a USB isolator (Linear technology) but failed.

While, I can connect to the nucleo board directly without isolator and programme it.

Beside, the PC can recognize the STLink from nucleo board correctly, which means the device can be found in the 'Device Manager'.

Using zephyr openOCD for flashing the code but getting below error

Error: libusb_open() failed with LIBUSB_ERROR_NOT_SUPPORTED
Error: libusb_open() failed with LIBUSB_ERROR_NOT_SUPPORTED
Error: read version failed
in procedure 'init'

I also tried with IAR IDE but not getting code flash and also debug default terminal is also hang after some time

I'm wondering what's wrong, anyone can help?

Many thanks​

[Andrew Neil]

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@DhirajThakur wrote:

I expected to connect my PC to a nucleo STM32H743ZI2 board via a USB isolator (Linear technology) but failed.

While, I can connect to the nucleo board directly without isolator and programme it.​

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Which does suggest that the isolator is the problem.

Do any other USB devices work via this isolator?

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@DhirajThakur wrote:

Beside, the PC can recognize the STLink from nucleo board correctly, which means the device can be found in the 'Device Manager'.​

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Is that with or without the Isolator?

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@DhirajThakur wrote:

Using zephyr openOCD for flashing the code but getting below error

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Is that with or without the Isolator?

What about with STM32 CubeIDE and/or CubeProgrammer ?

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@DhirajThakur wrote:

I also tried with IAR IDE but not getting code flash ​

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Again, is that with or without the Isolator?

[SofLit]

Hello @DhirajThakur and welcome to the community,

Indeed you need to check that "USB isolator" first .. Try it with other USB devices ..

Is this what you are using?: https://www.analog.com/media/en/technical-documentation/user-guides/dc2092a_ltp2884fa.pdf

[Andrew Neil · Accepted solution]

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@SofLit wrote:

Is this what you are using?: https://www.analog.com/media/en/technical-documentation/user-guides/dc2092a_ltp2884fa.pdf

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@DhirajThakur If so, pay attention to:

Are you sure that you have sufficient power for your Target?

[SofLit]

+ If so,

Check ILIM LED.

Did you connect an auxiliary power supply (12V) to increase the power?