Constant SCL Ticking with I3C Controller on STM32H563ZI

[RonenW]

Hi,

I'm using the I3C_Controller_HotJoin_IT example on the STM32H563ZI.

After initialization, when a Target device is connected to the I3C bus, the controller continuously activates the SCL line.

This behavior does not occur when the Target device is another STM32H563ZI running the I3C_Target_HotJoin_IT example.

Has anyone experienced this issue or can suggest a possible workaround?

Thanks, Ronen

[Saket_Om]

Hello @RonenW 

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@RonenW wrote:

Hi,

This behavior does not occur when the Target device is another STM32H563ZI running the I3C_Target_HotJoin_IT example.

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What do you mean by when the Target device is another STM32H563ZI?

If replacing the board solves the problem, it means the original board is damaged.

[RonenW]

Hi @Saket_Om,

When both the Controller and Target are STM32H563ZI boards, no issues occur.

However, when the Controller is an STM32H563ZI and the Target is a different board, the issue arises (The SCL line is continuously toggling).

Ronen

[Saket_Om]

Hello @RonenW 

Is it a custom board or a board from ST ?

Did you check the pull up resistor on your board and compare it with nucleo board ?

[RonenW]

Hi @Saket_Om ,

This is not an ST board. I tested several other boards, including the latest one - the I3C Protocol Analyzer and Exerciser from Prodigy Technovations.

I haven’t verified the pull-up configuration on the Prodigy device, as it is a protocol analyzer, and I do not observe any issues with it.

Ronen