How to remove stop condition after MDB when I3C IBI comes on LPC55S36

[sam_wu_7911]

Hi there,

I'm trying to program I3C IBI without a stop condition after the mandatory byte data, and connecting a restart condition to read data afterwards. How could I do?

Below is the IBI waveform that I did with MDB.

 void i3c_master_ibi_callback(I3C_Type *base,

                                    i3c_master_handle_t *handle,

                                    i3c_ibi_type_t ibiType,

                                    i3c_ibi_state_t ibiState)

{

    switch (ibiType)

    {

        case kI3C_IbiNormal:

            if (ibiState == kI3C_IbiDataBuffNeed)

            {

                handle->ibiBuff = g_master_ibiBuff;

            }

            else if (ibiState == kI3C_IbiReady)

            {

                memcpy(g_ibiUserBuff, (void *)handle->ibiBuff, handle->ibiPayloadSize);

            }

            break;

        case kI3C_IbiHotJoin:

            I3C_MasterEmitIBIResponse(EXAMPLE_MASTER, kI3C_IbiRespManual);

            break;

        default:

            assert(false);

            break;

    }

}

void i3c_master_callback(I3C_Type *base, i3c_master_handle_t *handle, status_t status, void *userData)

{

    if (status == kStatus_I3C_IBIWon)

    {

        g_ibiWonFlag = true;

    }

    else

    {

        /* Signal transfer complete when received complete status. */

        g_masterCompletionFlag = true;

    }

    g_completionStatus = status;

}

[Harry_Zhang]

Hi @sam_wu_7911 

According to the LPC553x Reference Manual.

The controller automatically stops IBI data after nine total bytes (including Mandatory Data
byte).

May I ask what your specific application is?

BR

Harry

[sam_wu_7911]

Hi @Harry_Zhang 

This application is a bridge between the target and the PC/laptop with HID-I3C Protocol.

According to the document of HID-I3C Protocol, after the MDB shall be a restart condition directly. Please see the figure below. 

I wonder if LPC55S36 cannot match this requirement, is there another NXP MCU that can match?

[Harry_Zhang]

Hi @sam_wu_7911 

I have confirmed with internal team.

The lpc55s36 can match this requirement,

You just need to add

handle->state = (uint8_t)kWaitRepeatedStartCompleteState;

after

stateParams->result = kStatus_I3C_IBIWon;

Additionally, could you please tell me  which specification the shared image (HID-I3C Protocol) comes from? we are  quite interested and would like to study it.

BR

Harry

[sam_wu_7911]

Hi @Harry_Zhang 

OK, I'll try it asap and let you know.

This document was provided by Microsoft and requires an NDA.

BTW, I have another question that hasn't been solved, pls help with it. I'll appreciate it.

https://community.nxp.com/t5/LPC-Microcontrollers/LPC55S36-I3C-SCL-isn-t-completed-during-Hot-Join/m...

[Harry_Zhang]

Hi @sam_wu_7911 

I just replied to this post.

BR

Harry

[Harry_Zhang]

Hi @sam_wu_7911 

I need to confirm with the internal team.

BR

Harry