STM32H503 I3C, I3C_RSTDAA_THEN_ENTDAA issue

[SteveDu]

Hi, I am working with STM32H503RB.

I'm currently testing the function of "I3C_Controller_ENTDAA_IT" from the example code.

Capture1 is the result of "I3C_RSTDAA_THEN_ENTDAA"

The expected behavior of Capture1 should be 7E06 then 7E07.

Why would 7E02 occur along with a write error?

Capture2 is the result of "I3C_ONLY_ENTDAA"

My questions are:

1. I'm wondering where is the code that define the configures in color green.

2. Is it able to modify their values?

3. Is it a successful ENTDAA process?

[Foued_KH]

Hello @SteveDu, 

If you are using a sensor as an I3C target you can't modify these value.
But If you are connection STM32 MCU as a target you can modify the Bits 15:12 MIPIID[3:0]: 4-bit MIPI Instance ID by software.

When STM32 MCU as target : 
DCR[7:0]: device characteristics ID
- 0x00: generic device (for v1.0 devices)
- others: ID to describe the type of the I3C sensor/device
Note: The latest MIPI DCR ID assignments are available on https://www.mipi.org

BCR[7:0] :  bus characteristics register 
you can configure three bits used by hardware.
for more information : check the section : 35.16.23 I3C bus characteristics register (I3C_BCR) RM0492

3.Capture2 is good result of dynamic addressing.

[SteveDu]

Hi Foued,

Thanks for your reply.

1. Still wondering whether the waveform in Capture1 matched the expected behavior of the code below.

if (HAL_I3C_Ctrl_DynAddrAssign_IT(&hi3c1, I3C_RSTDAA_THEN_ENTDAA) != HAL_OK)

 {

/* Error_Handler() function is called when error occurs. */

 Error_Handler();

}

If not, please help me to fix this problem.🙏

2. I'm not using STM32 MCU as an I3C target, does it mean that I cannot modify the values of those bits?

(If there's a token that could enable the access of modification, please let me know)🙏

[Foued_KH]

1/ could you please the section 4.1.1. Interrupt mode in the WIKI : Getting started with I3C - stm32mcu

2/ You can modify the value of those bits.

Foued