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Associate
August 1, 2025
Solved

STM32H563ZI: I3C Hot-join support with STM as I3C Controller

Hi,

Suppose I have an I3C target endpoint sending Hot-join request after RSTDAA, is STM32H562/3ZI capable of detecting the Hot-join and pass it on to the firmware layer ? I see Hot-join request support and sample code as an I3C Target in STM32Cube repo on GitHub and generated code. How do we deal with Hot-join request as an I3C Controller

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QSHAO.1
QSHAO.1Best answer
ST Employee
August 7, 2025

Refer to description about Bit19 HJF of I3C event register (I3C_EVR) shown below, you are allowed to identify Hot-join as I3C controller by checking this bit in your FW. thanks! 

QSHAO1_0-1754557245352.png

 

1 reply

QSHAO.1
QSHAO.1Best answer
ST Employee
August 7, 2025

Refer to description about Bit19 HJF of I3C event register (I3C_EVR) shown below, you are allowed to identify Hot-join as I3C controller by checking this bit in your FW. thanks! 

QSHAO1_0-1754557245352.png