How to configure slave to enter and exit HDR mode through I3C on stm32h503

[taylor_quan]

I am using the following slave device for I3C reading and writing. I can now read and write CMOS registers through private mode, but I cannot find any examples of entering and exiting HDR mode. Can you provide an example program for entering and exiting HDR mode? Thanks

[taylor_quan]

Another issue is that I cannot cancel the reserved byte when using private read

I3C_PrivateTypeDef aPrivateDescriptor[3] = \
                                          {
                                            {TARGET1_DYN_ADDR, {aTxBuffer, 2}, {NULL, 0}, HAL_I3C_DIRECTION_WRITE},
                                            {TARGET1_DYN_ADDR, {NULL, 0}, {aRxBuffer, 30}, HAL_I3C_DIRECTION_READ},
											{TARGET1_DYN_ADDR, {aTxBuffer, 2}, {aRxBuffer, 30}, HAL_I3C_DIRECTION_BOTH}
                                          };

    /*##- Add context buffer transmit in Frame context #####################*/
      if (HAL_I3C_AddDescToFrame(&hi3c1,
                                 NULL,
                                 &aPrivateDescriptor[I3C_IDX_FRAME_1],
                                 &aContextBuffers[I3C_IDX_FRAME_1],
                                 aContextBuffers[I3C_IDX_FRAME_1].CtrlBuf.Size,
								 I3C_PRIVATE_WITH_ARB_RESTART) != HAL_OK)
    {
      /* Error_Handler() function is called when error occurs. */
      Error_Handler();
    }

    /*##- Start the transmission process ###################################*/
    /* Transmit private data processus */
    if (HAL_I3C_Ctrl_Transmit(&hi3c1, &aContextBuffers[0],100) != HAL_OK)
    {
      /* Error_Handler() function is called when error occurs. */
      Error_Handler();
    }

    while (HAL_I3C_GetState(&hi3c1) != HAL_I3C_STATE_READY)
    {
    }

    if (HAL_I3C_AddDescToFrame(&hi3c1,
							   NULL,
							   &aPrivateDescriptor[1],
							   &aContextBuffers[I3C_IDX_FRAME_2],
							   aContextBuffers[I3C_IDX_FRAME_2].CtrlBuf.Size,
							   I3C_PRIVATE_WITHOUT_ARB_STOP) != HAL_OK)
    {
      /* Error_Handler() function is called when error occurs. */
      Error_Handler();
    }
    if(HAL_I3C_Ctrl_Receive(&hi3c1, &aContextBuffers[I3C_IDX_FRAME_2],100) != HAL_OK)
    {
    	/* Error_Handler() function is called when error occurs. */
    	Error_Handler();
    }

[Foued_KH · Accepted solution]

Hello @taylor_quan , 

- HDR exit pattern generation on the I3C bus for error recovery.
You can enable the HDR exit via the I3C_CFGR register : [ Bit 4 EXITPTRN: HDR exit pattern enable (when I3C acts as a controller) ]

Foued